FlatFiles 4.14.0

.NET Core 3.0 This package targets .NET Core 3.0. The package is compatible with this framework or higher. .NET Standard 1.6 This package targets .NET Standard 1.6. The package is compatible with this framework or higher. .NET Framework 4.5.1 This package targets .NET Framework 4.5.1. The package is compatible with this framework or higher.
There is a newer version of this package available.
See the version list below for details. 
dotnet add package FlatFiles --version 4.14.0                

                    
                

            
NuGet\Install-Package FlatFiles -Version 4.14.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="FlatFiles" Version="4.14.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
paket add FlatFiles --version 4.14.0                

                    
                

            
#r "nuget: FlatFiles, 4.14.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
// Install FlatFiles as a Cake Addin
#addin nuget:?package=FlatFiles&version=4.14.0

// Install FlatFiles as a Cake Tool
#tool nuget:?package=FlatFiles&version=4.14.0

Reads and writes CSV, fixed-length and other flat file formats with a focus on schema definition, configuration and speed. Supports mapping directly between files and classes.

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp1.0 was computed.  netcoreapp1.1 was computed.  netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 is compatible.  netcoreapp3.1 was computed. 
.NET Standard netstandard1.6 is compatible.  netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net451 is compatible.  net452 was computed.  net46 was computed.  net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen30 was computed.  tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (2)

Showing the top 2 NuGet packages that depend on FlatFiles:

Package Downloads
FlatExcelHelper

Flat and Excel file helper to datatable
FlatFiles.Mvc

Use FlatFiles to generate MVC ActionResults.

GitHub repositories (1)

Showing the top 1 popular GitHub repositories that depend on FlatFiles:

Repository Stars
leandromoh/RecordParser
Zero Allocation Writer/Reader Parser for .NET Core
Version Downloads Last updated
5.0.4 269,108 12/4/2022
5.0.3 20,188 10/3/2022
5.0.2 45,286 5/27/2022
5.0.1 154,800 2/24/2022
5.0.0 16,940 2/20/2022
4.16.0 119,589 6/27/2021
4.15.0 8,262 5/11/2021
4.14.0 1,234 5/2/2021
4.13.0 43,495 12/4/2020
4.12.0 10,137 10/22/2020
4.11.0 10,612 10/9/2020
4.10.0 1,548 10/7/2020
4.9.0 1,292 9/26/2020
4.8.0 3,113 9/17/2020
4.7.0 71,446 2/15/2020
4.6.0 51,043 6/4/2019
4.5.0 1,736 5/30/2019
4.4.0 14,109 5/25/2019
4.3.4 20,246 3/10/2019
4.3.3 26,653 10/15/2018
4.3.2 2,553 10/2/2018
4.3.1.1 1,855 9/25/2018
4.3.1 1,891 9/25/2018
4.3.0 7,839 7/17/2018
4.2.0 2,018 7/15/2018
4.1.0 2,056 7/15/2018
4.0.0 2,057 7/15/2018
3.0.1 2,115 7/8/2018
3.0.0 2,020 7/7/2018
3.0.0-rc 1,831 7/5/2018
3.0.0-beta.7 1,136 7/4/2018
3.0.0-beta.6 1,043 7/2/2018
3.0.0-beta.5 1,119 7/1/2018
3.0.0-beta.4 1,127 7/1/2018
3.0.0-beta.3 1,134 7/1/2018
3.0.0-beta.2 1,112 6/30/2018
3.0.0-beta.1 1,043 6/30/2018
3.0.0-beta 1,852 6/30/2018
2.1.3 2,448 6/17/2018
2.1.2 2,002 6/16/2018
2.1.1 2,894 6/11/2018
2.1.0 2,106 6/5/2018
2.0.0 2,055 6/5/2018
1.7.1 4,023 4/28/2018
1.7.0 2,052 4/27/2018
1.6.3 3,188 4/18/2018
1.6.2 15,642 11/27/2017
1.6.1 2,710 11/9/2017
1.6.0 2,104 11/6/2017
1.5.0 2,075 11/5/2017
1.4.0 2,007 11/2/2017
1.3.1 2,419 10/31/2017
1.3.0 2,060 10/30/2017
1.2.0 2,053 10/29/2017
1.1.1 2,047 10/28/2017
1.1.0 2,019 10/27/2017
1.0.1 2,077 10/27/2017
1.0.0 2,167 10/26/2017
0.3.26 2,068 10/26/2017
0.3.25 6,857 9/21/2017
0.3.23 24,314 5/25/2017
0.3.22 2,095 5/25/2017
0.3.21 2,071 5/25/2017
0.3.20 3,317 5/1/2017
0.3.19 8,166 7/21/2016
0.3.18 3,440 6/28/2016
0.3.17 2,093 6/28/2016
0.3.16 2,140 6/28/2016
0.3.15 8,481 6/20/2016
0.3.14 2,768 6/15/2016
0.3.13 2,704 6/15/2016
0.3.12 2,574 6/14/2016
0.3.11 2,658 6/13/2016
0.3.10 2,641 6/13/2016
0.3.9 2,600 6/13/2016
0.3.8 2,421 6/10/2016
0.3.7 2,449 6/10/2016
0.3.6 2,502 6/10/2016
0.3.5 2,444 6/10/2016
0.3.4 2,527 6/10/2016
0.3.3 2,544 6/10/2016
0.3.2 2,577 6/10/2016
0.3.1 2,618 6/10/2016
0.3.0 2,592 6/9/2016
0.2.1 2,343 6/9/2016
0.2.0 2,451 5/31/2016
0.1.17 2,435 5/12/2016
0.1.16 2,394 5/12/2016
0.1.15 2,633 5/10/2016
0.1.14 3,239 12/1/2015
0.1.13 4,732 8/20/2015
0.1.12 2,391 8/20/2015
0.1.10 3,141 1/16/2015
0.1.9 4,263 6/28/2014
0.1.8 2,544 2/11/2014
0.1.7 2,253 1/30/2014
0.1.6 2,240 1/30/2014
0.1.5 2,462 1/26/2014
0.1.4 2,285 1/25/2014
0.1.3 2,286 1/25/2014
0.1.2 2,262 1/25/2014
0.1.1 2,282 1/25/2014
0.1.0 2,365 1/24/2014

The behavior of TypedWriter.WriteAll is somewhat unintuitive when called with no records. The expectation is that the header/schema is written when performing this bulk operation; otherwise, the caller has to explicitly call WriteSchema explicitly beforehand. This slightly changes the behavior of the code, such that it might result in headers/schema being written in cases where the file was blank before. However, when IsFirstRecordSchema is true, it is extremely unlikely consumers would expect a blank file to be generated.

During my testing, I also discovered a bug where the schema was getting set, then unset when the header/schema record was the only record in the file. You should be able to try to read the first record of an empty file and get false back, then read the schema via GetSchema; however, my code would throwing an InvalidOperationException or, worse, a NullReferenceException.