Gurung.RepositoryPattern 1.0.1

Repository Pattern with Entity Framework Core

Overview

The Repository Pattern provides a way to encapsulate data access logic and abstract away the details of data storage and retrieval. This approach promotes separation of concerns, making your application more maintainable and testable.

Target Framework

This project is built with .NET 5.0 and uses Entity Framework Core version 5.0.17.## Installation

Install with .NET CLI

 dotnet add package Gurung.RepositoryPattern --version 1.0.1

Install with Package Manager

 NuGet\Install-Package Gurung.RepositoryPattern -Version 1.0.1

Example Usage

Configuring Services in Startup

To add the repository service to the dependency injection container, use the RepositoryServiceRegistration.ConfigureServices method in the Startup or Pragram class. Here's how you can do it:

Example in Startup.cs

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        // Register your DbContext
        services.AddDbContext<DbContext>(options => 
            options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

        // Register the repository service
        RepositoryServiceRegistration.ConfigureServices(services);
    }
}

Example in Program.cs

using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.EntityFrameworkCore;
using Gurung.RepositoryPattern; // Update namespace

var builder = WebApplication.CreateBuilder(args);

// Register your DbContext
builder.Services.AddDbContext<DbContext>(options =>
    options.UseSqlServer(builder.Configuration.GetConnectionString("DefaultConnection")));

// Register the repository service
RepositoryServiceRegistration.ConfigureServices(builder.Services);

var app = builder.Build();
app.Run();

Documentation

Repository Interface

The IRepository<T> interface offers a wide range of methods for interacting with your data. Below is a summary of the available methods:

Queryable

• IQueryable<T> Queryable { get; }
• IQueryable<T> GetQueryable()

GeneratePredicate

• Expression<Func<T, bool>> GeneratePredicate()

GetAll

• IEnumerable<T> GetAll()

• IEnumerable<T> GetAllAsNoTracking()

• IEnumerable<T> GetAll(params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• IEnumerable<T> GetAllAsNoTracking(params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• Task<IEnumerable<T>> GetAllAsync()

• Task<IEnumerable<T>> GetAllAsNoTrackingAsync()

• Task<IEnumerable<T>> GetAllAsync(params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• Task<IEnumerable<T>> GetAllAsNoTrackingAsync(params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• IEnumerable<T> GetAll(int pageNumber, int pageSize)

• IEnumerable<T> GetAllAsNoTracking(int pageNumber, int pageSize)

• IEnumerable<T> GetAll(int pageNumber, int pageSize, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• IEnumerable<T> GetAllAsNoTracking(int pageNumber, int pageSize, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• Task<IEnumerable<T>> GetAllAsync(int pageNumber, int pageSize)

• Task<IEnumerable<T>> GetAllAsNoTrackingAsync(int pageNumber, int pageSize)

• Task<IEnumerable<T>> GetAllAsync(int pageNumber, int pageSize, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• Task<IEnumerable<T>> GetAllAsNoTrackingAsync(int pageNumber, int pageSize, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

GetById

• T GetById(int id)

• T GetById(long id)

• Task<T> GetByIdAsync(int id)

• Task<T> GetByIdAsync(long id)

• T GetByIdAsNoTracking(int id)

• T GetByIdAsNoTracking(long id)

• Task<T> GetByIdAsNoTrackingAsync(int id)

• Task<T> GetByIdAsNoTrackingAsync(long id)

• T GetById(string id)

• Task<T> GetByIdAsync(string id)

• T GetByIdAsNoTracking(string id)

• Task<T> GetByIdAsNoTrackingAsync(string id)

• T GetById(Guid id)

• Task<T> GetByIdAsync(Guid id)

• T GetByIdAsNoTracking(Guid id)

• Task<T> GetByIdAsNoTrackingAsync(Guid id)

FirstOrDefault

• T FirstOrDefault()

• Task<T> FirstOrDefaultAsync()

• T FirstOrDefaultAsNoTracking()

• Task<T> FirstOrDefaultAsyncAsNoTracking()

• T FirstOrDefault(Expression<Func<T, bool>> predicate)

• Task<T> FirstOrDefaultAsync(Expression<Func<T, bool>> predicate)

• T FirstOrDefaultAsNoTracking(Expression<Func<T, bool>> predicate)

• Task<T> FirstOrDefaultAsyncAsNoTracking(Expression<Func<T, bool>> predicate)

• T FirstOrDefault(params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• Task<T> FirstOrDefaultAsync(params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• T FirstOrDefaultAsNoTracking(params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• Task<T> FirstOrDefaultAsyncAsNoTracking(params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• T FirstOrDefault(Expression<Func<T, bool>> predicate, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• Task<T> FirstOrDefaultAsync(Expression<Func<T, bool>> predicate, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• T FirstOrDefaultAsNoTracking(Expression<Func<T, bool>> predicate, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• Task<T> FirstOrDefaultAsyncAsNoTracking(Expression<Func<T, bool>> predicate, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

Find

• IEnumerable<T> Find(Expression<Func<T, bool>> predicate)

• IEnumerable<T> Find(Expression<Func<T, bool>> predicate, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• IEnumerable<T> Find(Expression<Func<T, bool>> predicate, int pageNumber, int pageSize, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• IEnumerable<T> FindAsNoTracking(Expression<Func<T, bool>> predicate)

• IEnumerable<T> FindAsNoTracking(Expression<Func<T, bool>> predicate, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• IEnumerable<T> FindAsNoTracking(Expression<Func<T, bool>> predicate, int pageNumber, int pageSize, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• Task<IEnumerable<T>> FindAsync(Expression<Func<T, bool>> predicate)

• Task<IEnumerable<T>> FindAsync(Expression<Func<T, bool>> predicate, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• Task<IEnumerable<T>> FindAsync(Expression<Func<T, bool>> predicate, int pageNumber, int pageSize, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• Task<IEnumerable<T>> FindAsyncAsNoTracking(Expression<Func<T, bool>> predicate)

• Task<IEnumerable<T>> FindAsyncAsNoTracking(Expression<Func<T, bool>> predicate, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

• Task<IEnumerable<T>> FindAsyncAsNoTracking(Expression<Func<T, bool>> predicate, int pageNumber, int pageSize, params (Expression<Func<T, object>> KeySelector, bool Descending)[] orderBys)

Add

• T Add(T entity)
• Task<T> AddAsync(T entity, CancellationToken cancellationToken = default)
• IEnumerable<T> AddRange(IEnumerable<T> entities, CancellationToken cancellationToken = default)
• Task<IEnumerable<T>> AddRangeAsync(IEnumerable<T> entities, CancellationToken cancellationToken = default)

Update

• T Update(T entity)
• Task<T> UpdateAsync(T entity)
• IEnumerable<T> UpdateRange(List<T> entities)
• Task<IEnumerable<T>> UpdateRangeAsync(List<T> entities)

Delete

• void Remove(T entity)
• Task RemoveAsync(T entity)
• void RemoveRange(IEnumerable<T> entities)
• Task RemoveRangeAsync(IEnumerable<T> entities)

Count

• int Count()
• int Count(Expression<Func<T, bool>> where)
• Task<int> CountAsync()
• Task<int> CountAsync(Expression<Func<T, bool>> where)

Any

• bool Any()
• bool Any(Expression<Func<T, bool>> where)
• Task<bool> AnyAsync()
• Task<bool> AnyAsync(Expression<Func<T, bool>> where)

Save Changes

• int SaveChanges()
• Task<int> SaveChangesAsync(CancellationToken cancellationToken = default)

Transaction Management

• IDbContextTransaction BeginTransaction()
• Task<IDbContextTransaction> BeginTransactionAsync()
• Task CommitTransactionAsync()
• Task RollbackTransactionAsync()

Using Queryable

Queryable

        var query = from area in _areasRepository.Queryable 
                    join country in _countryRepository.Queryable 
                    on area.CountryId equals country.Id
                    join state in _stateRepository.Queryable 
                    on area.StateId equals state.Id
                    where area.Id != 0 && area.IsDeleted == request.IsDeleted
                    orderby area.Location
                    select new GetAllAreaViewModel
                    {
                        Id = area.Id,
                        Location = area.Location,
                        Country = country.CountryName,
                        State = state.StateName,
                        Status = area.Status,
                        StatusNews = area.StatusNews,
                        IsActive = area.Status 
                    };
        IEnumerable<GetAllAreaViewModel> getAllAreaViewModels =await query.ToListAsync();

Using GetQueryable()

        var query = from area in _areasRepository.GetQueryable()
                    join country in _countryRepository.GetQueryable()
                    on area.CountryId equals country.Id
                    join state in _stateRepository.GetQueryable()
                    on area.StateId equals state.Id
                    where area.Id != 0 && area.IsDeleted == request.IsDeleted
                    orderby area.Location
                    select new GetAllAreaViewModel
                    {
                        Id = area.Id,
                        Location = area.Location,
                        Country = country.CountryName,
                        State = state.StateName,
                        Status = area.Status,
                        StatusNews = area.StatusNews,
                        IsActive = area.Status 
                    };
        IEnumerable<GetAllAreaViewModel> getAllAreaViewModels =await query.ToListAsync();

GeneratePredicate

The GeneratePredicate method allows the creation of dynamic filters using LINQ expressions (Expression<Func<T, bool>>). This flexibility helps you apply conditions dynamically, such as filtering data based on specific criteria.

public Task<PagedList<Product>> GetExpensiveProducts(int pageNumber, int pageSize)
{
       // Step 1: Generate a predicate for products with Price > 100
        Expression<Func<Product, bool>> predicate = p => p.Price > 100;

        // Step 2: Use the GeneratePredicate method to get the predicate
        var filter = _productRepository.GeneratePredicate(predicate);

        // Step 3: Get the count of products that match the filter
        var count = await _productRepository.CountAsync(predicate);

        // Step 4: Fetch products asynchronously using pagination and the predicate
        var productList= await _productRepository.FindAsync(pageNumber, pageSize, filter);
        return await PagedList<Product>(productList, pageNumber, pageSize);
}

Using GetAll

Retrieves all entities from the database.

GetAll

public IEnumerable<MyEntity> GetAllEntities()
{
    // retrieve all entities of type MyEntity from the database
    var allEntities =  _countryRepository.GetAll();
    foreach (var entity in allEntities)
    {
        Console.WriteLine(entity.Name);
    }
}

GetAllAsNoTracking

Retrieves all entities of the specified type T from the data source without tracking them in the context.

public IEnumerable<MyEntity> GetAllEntitiesAsNoTracking()
{
    // Retrieve all entities of type MyEntity from the database without tracking
    var allEntitiesNoTracking = _countryRepository.GetAllAsNoTracking();
    foreach (var entity in allEntitiesNoTracking)
    {
        Console.WriteLine(entity.Name);
    }
}

GetAll with Ordering

Retrieves all entities of the specified type T with optional ordering.

public IEnumerable<MyEntity> GetAllEntitiesOrdered()
{
    // Retrieve all entities of type MyEntity from the database, ordered by Name (ascending) and Population (descending)
    var orderedEntities = _countryRepository.GetAll(
        (x => x.Name, false),       // Sort by Name ascending
        (x => x.Population, true)    // Then by Population descending
    );

    foreach (var entity in orderedEntities)
    {
        Console.WriteLine($"{entity.Name} - {entity.Population}");
    }
}

GetAllAsNoTrackingAsync with Ordering

Asynchronously retrieves all entities of the specified type T without tracking and with optional ordering.

public async Task<IEnumerable<MyEntity>> GetAllEntitiesAsNoTrackingAsyncOrdered()
{
    // Asynchronously retrieve all entities of type MyEntity from the database without tracking, ordered by Name (ascending) and Population (descending)
    var orderedEntitiesNoTracking = await _countryRepository.GetAllAsNoTrackingAsync(
        (x => x.Name, false),       // Sort by Name ascending
        (x => x.Population, true)    // Then by Population descending
    );

    foreach (var entity in orderedEntitiesNoTracking)
    {
        Console.WriteLine($"{entity.Name} - {entity.Population}");
    }
}

GetAllAsync

public async Task<IEnumerable<MyEntity>> GetAllEntitiesAsync()
{
    // Asynchronously retrieve all entities of type MyEntity from the database
    var allEntities = await _countryRepository.GetAllAsync();
    foreach (var entity in allEntities)
    {
        Console.WriteLine(entity.Name);
    }
}

GetAllAsNoTrackingAsync

Asynchronously retrieves all entities of the specified type T from the data source without tracking.

public async Task<IEnumerable<MyEntity>> GetAllEntitiesAsNoTrackingAsync()
{
    // Asynchronously retrieve all entities of type MyEntity from the database without tracking
    var allEntitiesNoTracking = await _countryRepository.GetAllAsNoTrackingAsync();
    foreach (var entity in allEntitiesNoTracking)
    {
        Console.WriteLine(entity.Name);
    }
}

GetAllAsync with Ordering

Asynchronously retrieves all entities of the specified type T with optional ordering.

public async Task<IEnumerable<MyEntity>> GetAllEntitiesAsyncOrdered()
{
    // Asynchronously retrieve all entities of type MyEntity from the database, ordered by Name (ascending) and Population (descending)
    var orderedEntities = await _countryRepository.GetAllAsync(
        (x => x.Name, false),       // Sort by Name ascending
        (x => x.Population, true)    // Then by Population descending
    );

    foreach (var entity in orderedEntities)
    {
        Console.WriteLine($"{entity.Name} - {entity.Population}");
    }
}

GetAllAsNoTrackingAsync with Ordering

Asynchronously retrieves all entities of the specified type T without tracking and with optional ordering.

public async Task<IEnumerable<MyEntity>> GetAllEntitiesAsNoTrackingAsyncOrdered()
{
    // Asynchronously retrieve all entities of type MyEntity from the database without tracking, ordered by Name (ascending) and Population (descending)
    var orderedEntitiesNoTracking = await _countryRepository.GetAllAsNoTrackingAsync(
        (x => x.Name, false),       // Sort by Name ascending
        (x => x.Population, true)    // Then by Population descending
    );

    foreach (var entity in orderedEntitiesNoTracking)
    {
        Console.WriteLine($"{entity.Name} - {entity.Population}");
    }
}

GetAll (with pagination)

Retrieves a paginated list of entities. Results are tracked by the context (default EF behavior).

var products = repository.GetAll(1, 10); 

GetAllAsNoTracking (with pagination)

Retrieves a paginated list of entities with no-tracking. Results are not tracked by the EF context, which is useful for read-only operations.

var products = repository.GetAllAsNoTracking(1, 10); // Get the first page with 10 records, no EF tracking

GetAll (paginated and sorted results)

var sortedProducts = repository.GetAll(1, 10, (p => p.Price, false), (p => p.Name, true)); 
// Get first 10 products sorted by Price ascending, then by Name descending

GetAll (paginated and sorted results (no-tracking))

var sortedProducts = repository.GetAllAsNoTracking(1, 10, (p => p.Price, false), (p => p.Name, true));

GetAllAsync (with pagination)

var products = await repository.GetAllAsync(1, 10); // Fetches the first page of 10 items asynchronously.

GetAllAsNoTrackingAsync (with pagination)

var products = await repository.GetAllAsNoTrackingAsync(1, 10); // Asynchronous, no tracking.

GetAllAsync (with sorting and pagination)

var asyncSortedProducts = await repository.GetAllAsync(1, 10, (p => p.Price, false), (p => p.Name, true));

GetAllAsNoTrackingAsync (with sorting and pagination)

var asyncSortedProducts = await repository.GetAllAsNoTrackingAsync(1, 10, (p => p.Price, false), (p => p.Name, true));

Using GetById

Retrieves a single entity of type T from the database using its primary key (PK), types: string, int, long, and Guid. This method queries the database context to find the entity that matches the given primary key value.

GetById (int)(long)(string)(Guid)

var entityInt = _countryRepository.GetById(123);
var entityLong = _countryRepository.GetById(9876543210L);
var entityString = _countryRepository.GetById("abc123");
var entityGuid = _countryRepository.GetById(Guid.Parse("31ab6f9a-bb12-4359-9a2d-c92027ba50c6"));

Using FirstOrDefaultAsync

FirstOrDefault

Retrieves the first entity of the specified type T from the data source.

public MyEntity GetFirstEntity()
{
    // Retrieve the first entity of type MyEntity from the database
    var firstEntity = _countryRepository.FirstOrDefault();
    Console.WriteLine(firstEntity.Name);
    return firstEntity;
}

FirstOrDefaultAsync

Asynchronously retrieves the first entity of the specified type T from the data source.

public async Task<MyEntity> GetFirstEntityAsync()
{
    // Asynchronously retrieve the first entity of type MyEntity from the database
    var firstEntity = await _countryRepository.FirstOrDefaultAsync();
    Console.WriteLine(firstEntity.Name);
    return firstEntity;
}

FirstOrDefaultAsNoTracking

Retrieves the first entity of the specified type T from the data source without tracking.

public MyEntity GetFirstEntityAsNoTracking()
{
    // Retrieve the first entity of type MyEntity from the database without tracking
    var firstEntityNoTracking = _countryRepository.FirstOrDefaultAsNoTracking();
    Console.WriteLine(firstEntityNoTracking.Name);
    return firstEntityNoTracking;
}

FirstOrDefaultAsyncAsNoTracking

Asynchronously retrieves the first entity of the specified type T from the data source without tracking.

public async Task<MyEntity> GetFirstEntityAsyncAsNoTracking()
{
    // Asynchronously retrieve the first entity of type MyEntity from the database without tracking
    var firstEntityNoTracking = await _countryRepository.FirstOrDefaultAsyncAsNoTracking();
    Console.WriteLine(firstEntityNoTracking.Name);
    return firstEntityNoTracking;
}

FirstOrDefault with Predicate

Retrieves the first entity of the specified type T that matches a given predicate.

public MyEntity GetFirstActiveEntity()
{
    // Retrieve the first active entity of type MyEntity from the database
    var firstActiveEntity = _countryRepository.FirstOrDefault(x => x.IsActive);
    Console.WriteLine(firstActiveEntity.Name);
    return firstActiveEntity;
}

FirstOrDefaultAsync with Predicate

Asynchronously retrieves the first entity of the specified type T that matches a given predicate.

public async Task<MyEntity> GetFirstActiveEntityAsync()
{
    // Asynchronously retrieve the first active entity of type MyEntity from the database
    var firstActiveEntity = await _countryRepository.FirstOrDefaultAsync(x => x.IsActive);
    Console.WriteLine(firstActiveEntity.Name);
    return firstActiveEntity;
}

FirstOrDefaultAsNoTracking with Predicate

Retrieves the first entity of the specified type T that matches a given predicate without tracking.

public MyEntity GetFirstActiveEntityAsNoTracking()
{
    // Retrieve the first active entity of type MyEntity from the database without tracking
    var firstActiveEntityNoTracking = _countryRepository.FirstOrDefaultAsNoTracking(x => x.IsActive);
    Console.WriteLine(firstActiveEntityNoTracking.Name);
    return firstActiveEntityNoTracking;
}

FirstOrDefaultAsyncAsNoTracking with Predicate

Asynchronously retrieves the first entity of the specified type T that matches a given predicate without tracking.

public async Task<MyEntity> GetFirstActiveEntityAsyncAsNoTracking()
{
    // Asynchronously retrieve the first active entity of type MyEntity from the database without tracking
    var firstActiveEntityNoTracking = await _countryRepository.FirstOrDefaultAsyncAsNoTracking(x => x.IsActive);
    Console.WriteLine(firstActiveEntityNoTracking.Name);
    return firstActiveEntityNoTracking;
}

FirstOrDefault with Ordering

Retrieves the first entity of the specified type T with optional ordering.

public MyEntity GetFirstEntityOrdered()
{
    // Retrieve the first entity of type MyEntity, ordered by Name (ascending) and Population (descending)
    var firstEntityOrdered = _countryRepository.FirstOrDefault(
        (x => x.Name, false),       // Sort by Name ascending
        (x => x.Population, true)    // Then by Population descending
    );
    Console.WriteLine($"{firstEntityOrdered.Name} - {firstEntityOrdered.Population}");
    return firstEntityOrdered;
}

FirstOrDefaultAsync with Ordering

Asynchronously retrieves the first entity of the specified type T with optional ordering.

 public async Task<MyEntity> GetFirstEntityAsyncOrdered()
{
    // Asynchronously retrieve the first entity of type MyEntity, ordered by Name (ascending) and Population (descending)
    var firstEntityOrdered = await _countryRepository.FirstOrDefaultAsync(
        (x => x.Name, false),       // Sort by Name ascending
        (x => x.Population, true)    // Then by Population descending
    );
    Console.WriteLine($"{firstEntityOrdered.Name} - {firstEntityOrdered.Population}");
    return firstEntityOrdered;
}

FirstOrDefaultAsNoTracking with Ordering

Retrieves the first entity of the specified type T without tracking and with optional ordering.

public MyEntity GetFirstEntityAsNoTrackingOrdered()
{
    // Retrieve the first entity of type MyEntity without tracking, ordered by Name (ascending) and Population (descending)
    var firstEntityNoTrackingOrdered = _countryRepository.FirstOrDefaultAsNoTracking(
        (x => x.Name, false),       // Sort by Name ascending
        (x => x.Population, true)    // Then by Population descending
    );
    Console.WriteLine($"{firstEntityNoTrackingOrdered.Name} - {firstEntityNoTrackingOrdered.Population}");
    return firstEntityNoTrackingOrdered;
}

FirstOrDefaultAsyncAsNoTracking with Ordering

Asynchronously retrieves the first entity of the specified type T without tracking and with optional ordering.

public async Task<MyEntity> GetFirstEntityAsyncAsNoTrackingOrdered()
{
    // Asynchronously retrieve the first entity of type MyEntity without tracking, ordered by Name (ascending) and Population (descending)
    var firstEntityNoTrackingOrdered = await _countryRepository.FirstOrDefaultAsyncAsNoTracking(
        (x => x.Name, false),       // Sort by Name ascending
        (x => x.Population, true)    // Then by Population descending
    );
    Console.WriteLine($"{firstEntityNoTrackingOrdered.Name} - {firstEntityNoTrackingOrdered.Population}");
    return firstEntityNoTrackingOrdered;
}

FirstOrDefault with Predicate and Ordering

Retrieves the first entity of the specified type T that matches a given predicate with optional ordering.

public MyEntity GetFirstActiveEntityOrdered()
{
    // Retrieve the first active entity of type MyEntity, ordered by Name (ascending) and Population (descending)
    var firstActiveEntityOrdered = _countryRepository.FirstOrDefault(
        x => x.IsActive,            // Filtering predicate
        (x => x.Name, false),       // Sort by Name ascending
        (x => x.Population, true)    // Then by Population descending
    );
    Console.WriteLine($"{firstActiveEntityOrdered.Name} - {firstActiveEntityOrdered.Population}");
    return firstActiveEntityOrdered;
}

FirstOrDefaultAsync with predicate and order

The FirstOrDefaultAsync method allows you to retrieve the first record that matches specified filtering criteria and sorting order. It accepts a filtering predicate and a series of sorting criteria, which can be used to order the results.

public async Task<MyEntity> GetTopActiveEntityAsync()
{
    // Call the FirstOrDefaultAsync method with filtering and sorting criteria directly
    var topEntity = await _countryRepository.FirstOrDefaultAsync(
        x => x.IsActive && x.Population > 1000000, // Filtering predicate
        (x => x.Name, false),       // Sort by Name ascending
        (x => x.Population, true),   // Then by Population descending
        (x => x.Area, false)         // Finally by Area ascending
    );
    return topEntity;
}

### FirstOrDefaultAsNoTracking  with predicate and order
The `FirstOrDefaultAsync` method allows you to retrieve the first record that matches specified filtering criteria and sorting order. It accepts a filtering predicate and a series of sorting criteria, which can be used to order the results without tracking, with optional ordering..
```csharp
public async Task<MyEntity> GetTopActiveEntityAsync()
{
    // Call the FirstOrDefaultAsync method with filtering and sorting criteria directly
    var topEntity = await _countryRepository.FirstOrDefaultAsNoTracking(
        x => x.IsActive && x.Population > 1000000, // Filtering predicate
        (x => x.Name, false),       // Sort by Name ascending
        (x => x.Population, true),   // Then by Population descending
        (x => x.Area, false)         // Finally by Area ascending
    );
    return topEntity;
}

Using Find

The Find methods are used to retrieve entities that match a given predicate from the data source, with support for optional sorting, pagination, and tracking.

Find

public IEnumerable<MyEntity> FindEntities(Expression<Func<MyEntity, bool>> predicate)
{
    // Retrieve entities of type MyEntity that match the given predicate
    var foundEntities = _countryRepository.Find(x => x.IsActive);
    foreach (var entity in foundEntities)
    {
        Console.WriteLine(entity.Name);
    }
    return foundEntities;
}

Find with Ordering

Retrieves entities of the specified type T that match a given predicate, with optional sorting.

public IEnumerable<MyEntity> FindEntitiesOrdered()
{
    // Retrieve entities of type MyEntity that match the given predicate and are sorted by Name (ascending) and Population (descending)
    var foundEntities = _countryRepository.Find(
        x => x.IsActive,                    // Filtering predicate
        (x => x.Name, false),               // Sort by Name ascending
        (x => x.Population, true)           // Then by Population descending
    );
    foreach (var entity in foundEntities)
    {
        Console.WriteLine($"{entity.Name} - {entity.Population}");
    }
    return foundEntities;
}

Find with Pagination

Retrieves entities of the specified type T that match a given predicate, with optional sorting and pagination.

public IEnumerable<MyEntity> FindEntitiesPaged()
{
    // Retrieve entities of type MyEntity with filtering, sorting, and pagination
    var foundEntities = _countryRepository.Find(
        x => x.IsActive,                    // Filtering predicate
        1,                                  // Page number
        10,                                 // Page size
        (x => x.Name, false),               // Sort by Name ascending
        (x => x.Population, true)           // Then by Population descending
    );
    foreach (var entity in foundEntities)
    {
        Console.WriteLine($"{entity.Name} - {entity.Population}");
    }
    return foundEntities;
}

FindAsNoTracking

Retrieves all entities of the specified type T that match a given predicate without tracking.

public IEnumerable<MyEntity> FindEntitiesAsNoTracking()
{
    // Retrieve entities of type MyEntity that match the given predicate without tracking
    var foundEntitiesNoTracking = _countryRepository.FindAsNoTracking(x => x.IsActive);
    foreach (var entity in foundEntitiesNoTracking)
    {
        Console.WriteLine(entity.Name);
    }
    return foundEntitiesNoTracking;
}

FindAsNoTracking with Ordering

Retrieves entities of the specified type T that match a given predicate without tracking, with optional sorting.

public IEnumerable<MyEntity> FindEntitiesAsNoTrackingOrdered()
{
    // Retrieve entities of type MyEntity without tracking, sorted by Name (ascending) and Population (descending)
    var foundEntitiesNoTracking = _countryRepository.FindAsNoTracking(
        x => x.IsActive,                    // Filtering predicate
        (x => x.Name, false),               // Sort by Name ascending
        (x => x.Population, true)           // Then by Population descending
    );
    foreach (var entity in foundEntitiesNoTracking)
    {
        Console.WriteLine($"{entity.Name} - {entity.Population}");
    }
    return foundEntitiesNoTracking;
}

FindAsNoTracking with Pagination

Retrieves entities of the specified type T that match a given predicate without tracking, with optional sorting and pagination.

public IEnumerable<MyEntity> FindEntitiesAsNoTrackingPaged()
{
    // Retrieve entities of type MyEntity with filtering, sorting, and pagination without tracking
    var foundEntitiesNoTracking = _countryRepository.FindAsNoTracking(
        x => x.IsActive,                    // Filtering predicate
        1,                                  // Page number
        10,                                 // Page size
        (x => x.Name, false),               // Sort by Name ascending
        (x => x.Population, true)           // Then by Population descending
    );
    foreach (var entity in foundEntitiesNoTracking)
    {
        Console.WriteLine($"{entity.Name} - {entity.Population}");
    }
    return foundEntitiesNoTracking;
}

FindAsync

Asynchronously retrieves all entities of the specified type T that match a given predicate.

public async Task<IEnumerable<MyEntity>> FindEntitiesAsync()
{
    // Asynchronously retrieve entities of type MyEntity that match the given predicate
    var foundEntities = await _countryRepository.FindAsync(x => x.IsActive);
    foreach (var entity in foundEntities)
    {
        Console.WriteLine(entity.Name);
    }
    return foundEntities;
}

FindAsync with Ordering

Asynchronously retrieves entities of the specified type T that match a given predicate, with optional sorting.

public async Task<IEnumerable<MyEntity>> FindEntitiesAsyncOrdered()
{
    // Asynchronously retrieve entities of type MyEntity that match the given predicate, sorted by Name (ascending) and Population (descending)
    var foundEntities = await _countryRepository.FindAsync(
        x => x.IsActive,                    // Filtering predicate
        (x => x.Name, false),               // Sort by Name ascending
        (x => x.Population, true)           // Then by Population descending
    );
    foreach (var entity in foundEntities)
    {
        Console.WriteLine($"{entity.Name} - {entity.Population}");
    }
    return foundEntities;
}

FindAsync with Pagination

Asynchronously retrieves entities of the specified type T that match a given predicate, with optional sorting and pagination.

public async Task<IEnumerable<MyEntity>> FindEntitiesAsyncPaged()
{
    // Asynchronously retrieve entities of type MyEntity with filtering, sorting, and pagination
    var foundEntities = await _countryRepository.FindAsync(
        x => x.IsActive,                    // Filtering predicate
        1,                                  // Page number
        10,                                 // Page size
        (x => x.Name, false),               // Sort by Name ascending
        (x => x.Population, true)           // Then by Population descending
    );
    foreach (var entity in foundEntities)
    {
        Console.WriteLine($"{entity.Name} - {entity.Population}");
    }
    return foundEntities;
}

FindAsyncAsNoTracking

Asynchronously retrieves all entities of the specified type T that match a given predicate without tracking.

public async Task<IEnumerable<MyEntity>> FindEntitiesAsyncAsNoTracking()
{
    // Asynchronously retrieve entities of type MyEntity that match the given predicate without tracking
    var foundEntitiesNoTracking = await _countryRepository.FindAsyncAsNoTracking(x => x.IsActive);
    foreach (var entity in foundEntitiesNoTracking)
    {
        Console.WriteLine(entity.Name);
    }
    return foundEntitiesNoTracking;
}

FindAsyncAsNoTracking with Ordering

Asynchronously retrieves entities of the specified type T that match a given predicate without tracking, with optional sorting.

public async Task<IEnumerable<MyEntity>> FindEntitiesAsyncAsNoTrackingOrdered()
{
    // Asynchronously retrieve entities of type MyEntity without tracking, sorted by Name (ascending) and Population (descending)
    var foundEntitiesNoTracking = await _countryRepository.FindAsyncAsNoTracking(
        x => x.IsActive,                    // Filtering predicate
        (x => x.Name, false),               // Sort by Name ascending
        (x => x.Population, true)           // Then by Population descending
    );
    foreach (var entity in foundEntitiesNoTracking)
    {
        Console.WriteLine($"{entity.Name} - {entity.Population}");
    }
    return foundEntitiesNoTracking;
}

FindAsyncAsNoTracking with Pagination

Asynchronously retrieves entities of the specified type T that match a given predicate without tracking, with optional sorting and pagination.

public async Task<IEnumerable<MyEntity>> FindEntitiesAsyncAsNoTrackingPaged()
{
    // Asynchronously retrieve entities of type MyEntity with filtering, sorting, and pagination without tracking
    var foundEntitiesNoTracking = await _countryRepository.FindAsyncAsNoTracking(
        x => x.IsActive,                    // Filtering predicate
        1,                                  // Page number
        10,                                 // Page size
        (x => x.Name, false),               // Sort by Name ascending
        (x => x.Population, true)           // Then by Population descending
    );
    foreach (var entity in foundEntitiesNoTracking)
    {
        Console.WriteLine($"{entity.Name} - {entity.Population}");
    }
    return foundEntitiesNoTracking;
}

Add and AddRange Methods

AddAsync

Asynchronously adds a single entity of type T to the data source.

public async Task<MyEntity> AddEntityAsync(MyEntity entity)
{
    // Asynchronously add a new entity of type MyEntity
    var addedEntity = await _countryRepository.AddAsync(entity);
      // Save changes to the database
    await _countryRepository.SaveChangesAsync(cancellationToken);
    Console.WriteLine($"Added entity: {addedEntity.Name}");
    return addedEntity;
}

AddRange

Synchronously adds a range of entities of type T to the data source.

public IEnumerable<MyEntity> AddEntitiesRange(IEnumerable<MyEntity> entities)
{
    // Synchronously add a range of entities
    var addedEntities = _countryRepository.AddRange(entities);
      // Save changes to the database
    await _countryRepository.SaveChanges(cancellationToken);
    foreach (var entity in addedEntities)
    {
        Console.WriteLine($"Added entity: {entity.Name}");
    }
    return addedEntities;
}

AddRangeAsync

Asynchronously adds a range of entities of type T to the data source, with support for cancellation.

public async Task<IEnumerable<MyEntity>> AddEntitiesRangeAsync(IEnumerable<MyEntity> entities, CancellationToken cancellationToken = default)
{
    // Asynchronously add a range of entities with a cancellation token
    var addedEntities = await _countryRepository.AddRangeAsync(entities, cancellationToken);
      // Save changes to the database
    await _countryRepository.SaveChangesAsync(cancellationToken);
    foreach (var entity in addedEntities)
    {
        Console.WriteLine($"Added entity: {entity.Name}");
    }
    return addedEntities;
}

AddAsync with CancellationToken

Asynchronously adds an entity of type T to the data source with a cancellation token.

public async Task<MyEntity> AddEntityAsyncWithCancellation(MyEntity entity, CancellationToken cancellationToken)
{
    // Asynchronously add a new entity with a cancellation token
    var addedEntity = await _countryRepository.AddAsync(entity, cancellationToken);
      // Save changes to the database
    await _countryRepository.SaveChangesAsync(cancellationToken);
    Console.WriteLine($"Added entity: {addedEntity.Name}");
    return addedEntity;
}

AddRange with CancellationToken

Synchronously adds a range of entities of type T to the data source, with support for cancellation.

public IEnumerable<MyEntity> AddEntitiesRangeWithCancellation(IEnumerable<MyEntity> entities, CancellationToken cancellationToken)
{
    // Add a range of entities with a cancellation token
    var addedEntities = _countryRepository.AddRange(entities, cancellationToken);
      // Save changes to the database
    await _countryRepository.SaveChangesAsync(cancellationToken);
    foreach (var entity in addedEntities)
    {
        Console.WriteLine($"Added entity: {entity.Name}");
    }
    return addedEntities;
}

Update

Update

Synchronously updates a single entity of type T in the database context. This method marks the entity as modified, and the changes will be persisted when SaveChanges is called.

// Retrieve the entity to update
var entityToUpdate = _countryRepository.GetById(100);

// Modify the entity
entityToUpdate.Name = "Updated Name";

// Update the entity
var updatedEntity = _countryRepository.Update(entityToUpdate);

// Save changes to the database
_countryRepository.SaveChanges();

UpdateAsync

Asynchronously updates a single entity of type T in the database context. This method marks the entity as modified and will persist changes once SaveChangesAsync is called.

// Retrieve the entity to update
var entityToUpdate = await _countryRepository.GetById(10002);

// Modify the entity
entityToUpdate.Name = "Updated Name";

// Asynchronously update the entity
var updatedEntity = await _countryRepository.UpdateAsync(entityToUpdate);

// Save changes asynchronously to the database
await _countryRepository.SaveChangesAsync();

UpdateRange

Synchronously updates a range of entities of type T in the database context. This method marks each entity in the collection as modified and will persist the changes once SaveChanges is called.

// Retrieve the entities to update
var entitiesToUpdate = _countryRepository.Find(e => e.SomeCondition);

// Modify each entity
foreach (var entity in entitiesToUpdate)
{
    entity.Name = "Updated Name";
}

// Update the entities in the repository
var updatedEntities = _countryRepository.UpdateRange(entitiesToUpdate);

// Save changes to the database
_countryRepository.SaveChanges();

UpdateRangeAsync

Asynchronously updates a range of entities of type T in the database context. This method marks each entity in the collection as modified and will persist the changes once SaveChangesAsync is called.

// Retrieve the entities to update
var entitiesToUpdate = await _countryRepository.Find(e => e.SomeCondition);

// Modify each entity
foreach (var entity in entitiesToUpdate)
{
    entity.Name = "Updated Name";
}

// Asynchronously update the entities in the repository
var updatedEntities = await _countryRepository.UpdateRangeAsync(entitiesToUpdate);

// Save changes asynchronously to the database
await _countryRepository.SaveChangesAsync();

Remove

Removes or Delete data from database

Remove

// Retrieve the entity to remove
var entityToRemove = _countryRepository.Entities.GetById(entityId);

// Remove the entity from the context
_countryRepository.Remove(entityToRemove);

// Save changes to persist the removal to the database
 _countryRepository.SaveChanges();

RemoveAsync

Asynchronously removes a single entity from the database context.

// Retrieve the entity to remove
var entityToRemove = await _countryRepository.Entities.GetByIdAsync(entityId);

// Asynchronously remove the entity from the context
await _countryRepository.RemoveAsync(entityToRemove);

// Save changes to persist the removal to the database
await _countryRepository.SaveChangesAsync();

RemoveRange

Removes a range of entities from the database context.

// Retrieve the entities to remove
var entitiesToRemove = _countryRepository.Entities.Where(e => e.SomeCondition).ToList();

// Remove the entities from the context
_countryRepository.RemoveRange(entitiesToRemove);

// Save changes to persist the removal to the database
 _countryRepository.SaveChanges();

RemoveRangeAsync

// Retrieve the entities to remove
var entitiesToRemove = await _countryRepository.Entities.FindAsync(e => e.SomeCondition).ToList();

// Asynchronously remove the entities from the context
await _countryRepository.RemoveRangeAsync(entitiesToRemove);

// Save changes to persist the removal to the database
await _countryRepository.SaveChangesAsync();

Count

Count()

Synchronously counts the total number of records of type T in the database.

// Count all entities in the repository
int totalEntities = _countryRepository.Count();
Console.WriteLine($"Total entities: {totalEntities}");

Count() with with filtering

Synchronously counts the number of records that match a given condition (predicate).

// Count entities where the country name starts with 'A'
int count = _countryRepository.Count(c => c.Name.StartsWith("A"));
Console.WriteLine($"Countries starting with 'A': {count}");

CountAsync()

Asynchronously counts the total number of records of type T in the database.

// Asynchronously count all entities in the repository
int totalEntities = await _countryRepository.CountAsync();
Console.WriteLine($"Total entities: {totalEntities}");

CountAsync() with with filtering

Asynchronously counts the number of records that match a given condition (predicate).

// Asynchronously count entities where the country name starts with 'A'
int count = await _countryRepository.CountAsync(c => c.Name.StartsWith("A"));
Console.WriteLine($"Countries starting with 'A': {count}");

CountLong()

Synchronously counts the total number of records of type T in the database, returning a long result for large datasets.

// Count all entities with a long result type
long totalEntities = _countryRepository.CountLong();
Console.WriteLine($"Total entities (long): {totalEntities}");

CountLong() with with filtering

Synchronously counts the number of records that match a given condition (predicate), returning a long result for large datasets.

// Count entities where the country name starts with 'A' and return as long
long count = _countryRepository.CountLong(c => c.Name.StartsWith("A"));
Console.WriteLine($"Countries starting with 'A' (long): {count}");

CountLongAsync()

Asynchronously counts the total number of records of type T in the database, returning a long result for large datasets.

// Asynchronously count all entities with a long result type
long totalEntities = await _countryRepository.CountLongAsync();
Console.WriteLine($"Total entities (long): {totalEntities}");

CountLongAsync() with filtering

Asynchronously counts the number of records that match a given condition (predicate), returning a long result for large datasets.

// Asynchronously count entities where the country name starts with 'A' and return as long
long count = await _countryRepository.CountLongAsync(c => c.Name.StartsWith("A"));
Console.WriteLine($"Countries starting with 'A' (long): {count}");

Any

Any()

Synchronously checks whether any entities of type T exist in the database.

// Check if there are any entities in the repository
bool hasEntities = _countryRepository.Any();
Console.WriteLine($"Any entities in the repository: {hasEntities}");

Any() with filtering

Synchronously checks whether any entities that match the specified condition (predicate) exist in the database.

// Check if there are any entities where the country name starts with 'A'
bool hasEntities = _countryRepository.Any(c => c.Name.StartsWith("A"));
Console.WriteLine($"Any countries starting with 'A': {hasEntities}");

AnyAsync()

Asynchronously checks whether any entities of type T exist in the database.

// Asynchronously check if there are any entities in the repository
bool hasEntities = await _countryRepository.AnyAsync();
Console.WriteLine($"Any entities in the repository: {hasEntities}");

AnyAsync() with filtering

Asynchronously checks whether any entities that match the specified condition (predicate) exist in the database.

// Asynchronously check if there are any entities where the country name starts with 'A'
bool hasEntities = await _countryRepository.AnyAsync(c => c.Name.StartsWith("A"));
Console.WriteLine($"Any countries starting with 'A': {hasEntities}");

Transaction Management

Starts a new database transaction synchronously. This is useful when you want to execute multiple database operations as a single atomic operation.

public void ExecuteWithTransaction()
{
    using (var transaction = _countryRepository.BeginTransaction())
    {
        try
        {
            // Perform multiple database operations
            _countryRepository.Add(new Country { Name = "Nepal" });
            _countryRepository.SaveChanges();

            _countryRepository.Add(new Country { Name = "UK" });
            _countryRepository.SaveChanges();

            // Commit the transaction
            transaction.Commit();
        }
        catch (Exception ex)
        {
            // Rollback the transaction if any operation fails
            transaction.Rollback();
            throw; // Re-throw the exception
        }
    }
}