Resulver.AspNetCore.FastEndpoints 2.0.1

Table of content

• Installation
• Error Handling
• Using in Endpoints

Installation

dotnet add package Resulver.AspNetCore.FastEndpoints

Error Handling

1. First, add the following code to the Program.cs file:

builder.Services.AddResulver(Assembly.GetExecutingAssembly());

2. Create Error Profiles

In this example, we have created an error named ValidationError :

public class ValidationError(string title, string message) : ResultError(message, title: title);

Now, to manage responses related to this error, we will create a profile for it.

public class ValidationErrorProfile : ErrorProfile
{
    public override void Configure()
    {
        AddError<ValidationError>().WithStatusCode(400);
    }
}

Using in Endpoints

You can use the following methods to utilize IResultHandler in your Endpoints :

Method 1: Inheritance from the ResultBaseEndpoint class :

public class MyEndpoints : ResultBaseEndpoint<string,string>
{
    public override void Configure()
    {
        Post("my-endpoint");
        AllowAnonymous();
    }

    public override Task HandleAsync(string req, CancellationToken ct)
    {
        // logic
        //
        //
        
        var result = new Result<string>("this is result message");

        return SendFromResultAsync(result,200,ct);
    }
}

Note: In all cases, if the Result contains an error, a response will be generated based on the error profile created for that error.

Method 2: Inject IErrorResponseGenerator in to your Endpoint:

public class MyEndpoints : Ep.Req<string>.Res<string>
{
    public required IErrorResponseGenerator<FailureResponse> ErrorResponseGenerator { get; init; }
    
    public override void Configure()
    {
        Post("my-endpoint");
        AllowAnonymous();
    }

    public override Task HandleAsync(string req, CancellationToken ct)
    {
        // logic
        //
        //
        
        var result = new Result<string>("this is result message");


        if (result.IsFailure)
        {
            var failureResponse = ErrorResponseGenerator.MakeResponse(result.Errors[0]) ;
            AddError(failureResponse);
            
            return SendErrorsAsync(failureResponse.StatusCode,ct);
        }

        return SendOkAsync(result.Message,ct);
    }
}