System.IO.Abstractions 17.0.15

.NET 5.0 .NET Standard 2.0 .NET Framework 4.6.1
Install-Package System.IO.Abstractions -Version 17.0.15
dotnet add package System.IO.Abstractions --version 17.0.15
<PackageReference Include="System.IO.Abstractions" Version="17.0.15" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add System.IO.Abstractions --version 17.0.15
The NuGet Team does not provide support for this client. Please contact its maintainers for support.
#r "nuget: System.IO.Abstractions, 17.0.15"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install System.IO.Abstractions as a Cake Addin
#addin nuget:?package=System.IO.Abstractions&version=17.0.15

// Install System.IO.Abstractions as a Cake Tool
#tool nuget:?package=System.IO.Abstractions&version=17.0.15
The NuGet Team does not provide support for this client. Please contact its maintainers for support.

System.IO.Abstractions NuGet Continuous Integration Codacy Badge Renovate enabled FOSSA Status

At the core of the library is IFileSystem and FileSystem. Instead of calling methods like File.ReadAllText directly, use IFileSystem.File.ReadAllText. We have exactly the same API, except that ours is injectable and testable.

dotnet add package System.IO.Abstractions
public class MyComponent
{
    readonly IFileSystem fileSystem;

    // <summary>Create MyComponent with the given fileSystem implementation</summary>
    public MyComponent(IFileSystem fileSystem)
    {
        this.fileSystem = fileSystem;
    }
    /// <summary>Create MyComponent</summary>
    public MyComponent() : this(
        fileSystem: new FileSystem() //use default implementation which calls System.IO
    )
    {
    }

    public void Validate()
    {
        foreach (var textFile in fileSystem.Directory.GetFiles(@"c:\", "*.txt", SearchOption.TopDirectoryOnly))
        {
            var text = fileSystem.File.ReadAllText(textFile);
            if (text != "Testing is awesome.")
                throw new NotSupportedException("We can't go on together. It's not me, it's you.");
        }
    }
}

The library also ships with a series of test helpers to save you from having to mock out every call, for basic scenarios. They are not a complete copy of a real-life file system, but they'll get you most of the way there.

dotnet add package System.IO.Abstractions.TestingHelpers
[Test]
public void MyComponent_Validate_ShouldThrowNotSupportedExceptionIfTestingIsNotAwesome()
{
    // Arrange
    var fileSystem = new MockFileSystem(new Dictionary<string, MockFileData>
    {
        { @"c:\myfile.txt", new MockFileData("Testing is meh.") },
        { @"c:\demo\jQuery.js", new MockFileData("some js") },
        { @"c:\demo\image.gif", new MockFileData(new byte[] { 0x12, 0x34, 0x56, 0xd2 }) }
    });
    var component = new MyComponent(fileSystem);

    try
    {
        // Act
        component.Validate();
    }
    catch (NotSupportedException ex)
    {
        // Assert
        Assert.AreEqual("We can't go on together. It's not me, it's you.", ex.Message);
        return;
    }

    Assert.Fail("The expected exception was not thrown.");
}

We even support casting from the .NET Framework's untestable types to our testable wrappers:

FileInfo SomeApiMethodThatReturnsFileInfo()
{
    return new FileInfo("a");
}

void MyFancyMethod()
{
    var testableFileInfo = (FileInfoBase)SomeApiMethodThatReturnsFileInfo();
    ...
}

Since version 4.0 the top-level APIs expose interfaces instead of abstract base classes (these still exist, though), allowing you to completely mock the file system. Here's a small example, using Moq:

[Test]
public void Test1()
{
    var watcher = Mock.Of<IFileSystemWatcher>();
    var file = Mock.Of<IFile>();

    Mock.Get(file).Setup(f => f.Exists(It.IsAny<string>())).Returns(true);
    Mock.Get(file).Setup(f => f.ReadAllText(It.IsAny<string>())).Throws<OutOfMemoryException>();

    var unitUnderTest = new SomeClassUsingFileSystemWatcher(watcher, file);

    Assert.Throws<OutOfMemoryException>(() => {
        Mock.Get(watcher).Raise(w => w.Created += null, new System.IO.FileSystemEventArgs(System.IO.WatcherChangeTypes.Created, @"C:\Some\Directory", "Some.File"));
    });

    Mock.Get(file).Verify(f => f.Exists(It.IsAny<string>()), Times.Once);

    Assert.True(unitUnderTest.FileWasCreated);
}

public class SomeClassUsingFileSystemWatcher
{
    private readonly IFileSystemWatcher _watcher;
    private readonly IFile _file;

    public bool FileWasCreated { get; private set; }

    public SomeClassUsingFileSystemWatcher(IFileSystemWatcher watcher, IFile file)
    {
        this._file = file;
        this._watcher = watcher;
        this._watcher.Created += Watcher_Created;
    }

    private void Watcher_Created(object sender, System.IO.FileSystemEventArgs e)
    {
        FileWasCreated = true;

        if(_file.Exists(e.FullPath))
        {
            var text = _file.ReadAllText(e.FullPath);
        }
    }
}
Product Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows
.NET Core netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard2.0 netstandard2.1
.NET Framework net461 net462 net463 net47 net471 net472 net48
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen40 tizen60
Xamarin.iOS xamarinios
Xamarin.Mac xamarinmac
Xamarin.TVOS xamarintvos
Xamarin.WatchOS xamarinwatchos
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (205)

Showing the top 5 NuGet packages that depend on System.IO.Abstractions:

Package Downloads
KubernetesClient

Client library for the Kubernetes open source container orchestrator.

System.IO.Abstractions.TestingHelpers

A set of pre-built mocks to help when testing file system interactions.

VirtoCommerce.Platform.Core

Virto Commerce is a flexible B2B ecommerce solution that offers powerful tools for enterprise business users. https://virtocommerce.com

Reo.Core.Hosting

Package Description

Reo.Core.Database

Package Description

GitHub repositories (45)

Showing the top 5 popular GitHub repositories that depend on System.IO.Abstractions:

Repository Stars
microsoft/PowerToys
Windows system utilities to maximize productivity
abpframework/abp
Open Source Web Application Framework for ASP.NET Core
gitextensions/gitextensions
Git Extensions is a standalone UI tool for managing git repositories. It also integrates with Windows Explorer and Microsoft Visual Studio (2015/2017/2019).
JosefNemec/Playnite
Video game library manager with support for wide range of 3rd party libraries and game emulation support, providing one unified interface for your games.
projectkudu/kudu
Kudu is the engine behind git/hg deployments, WebJobs, and various other features in Azure Web Sites. It can also run outside of Azure.
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17.0.15 522 5/20/2022
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17.0.11 1,741 5/15/2022
17.0.10 6,916 5/12/2022
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17.0.3 36,430 4/26/2022
17.0.2 119 4/26/2022
17.0.1 4,314 4/25/2022
16.1.26 7,317 4/24/2022
16.1.25 132,973 3/23/2022
16.1.24 7,859 3/22/2022
16.1.23 40,078 3/14/2022
16.1.22 2,863 3/11/2022
16.1.21 117 3/11/2022
16.1.20 19,755 3/8/2022
16.1.19 136 3/8/2022
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16.1.17 124 3/8/2022
16.1.16 12,683 3/3/2022
16.1.15 67,041 2/19/2022
16.1.14 115 2/19/2022
16.1.13 157 2/19/2022
16.1.12 101 2/19/2022
16.1.11 8,254 2/17/2022
16.1.10 97,767 2/4/2022
16.1.9 6,895 2/2/2022
16.1.8 126 2/2/2022
16.1.7 8,379 1/31/2022
16.1.6 142 1/31/2022
16.1.5 1,014 1/31/2022
16.1.4 119,406 1/12/2022
16.1.2 1,015 1/12/2022
16.1.1 21,257 1/11/2022
16.0.8 31,265 1/9/2022
16.0.7 478 1/8/2022
16.0.6 166 1/8/2022
16.0.5 140 1/8/2022
16.0.4 141 1/8/2022
16.0.3 25,318 1/6/2022
16.0.2 2,730 1/6/2022
16.0.1 214,359 12/22/2021
15.0.1 1,211 12/22/2021
14.0.13 89,620 12/11/2021
14.0.12 157 12/11/2021
14.0.11 393 12/11/2021
14.0.10 307 12/11/2021
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14.0.7 307 12/10/2021
14.0.6 169 12/10/2021
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14.0.4 361 12/10/2021
14.0.3 103,836 11/27/2021
14.0.2 2,005 11/26/2021
14.0.1 2,190 11/26/2021
13.2.47 1,290,145 8/25/2021
13.2.46 474 8/25/2021
13.2.45 290 8/25/2021
13.2.43 257,200 7/27/2021
13.2.42 188,161 7/23/2021
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13.2.33 1,181,961 5/15/2021
13.2.32 418 5/15/2021
13.2.31 81,261 5/2/2021
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13.2.29 235,956 4/14/2021
13.2.28 440,547 3/25/2021
13.2.27 1,388 3/25/2021
13.2.25 635,962 3/9/2021
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13.2.23 131,138 2/24/2021
13.2.22 494 2/24/2021
13.2.20 9,018 2/23/2021
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13.2.15 15,890 2/18/2021
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13.2.11 19,682 2/16/2021
13.2.10 121,938 2/10/2021
13.2.9 454,236 1/14/2021
13.2.8 120,070 12/22/2020
13.2.7 15,035 12/20/2020
13.2.6 54,386 12/16/2020
13.2.5 75,029 12/9/2020
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13.2.3 857 12/4/2020
13.2.2 103,231 11/26/2020
13.2.1 9,122 11/26/2020
13.1.2 564 11/25/2020
13.1.1 511 11/25/2020
13.0.1 97,750 11/21/2020
12.2.27 16,258 11/21/2020
12.2.26 3,021 11/20/2020
12.2.25 74,269 11/17/2020
12.2.24 76,360 11/15/2020
12.2.23 564 11/15/2020
12.2.22 686 11/14/2020
12.2.21 5,765 11/12/2020
12.2.20 1,831 11/12/2020
12.2.19 66,920 11/5/2020
12.2.7 280,394 10/15/2020
12.2.6 11,100 10/15/2020
12.2.5 73,437 10/12/2020
12.2.4 497 10/12/2020
12.2.3 45,816 10/12/2020
12.2.2 20,537 10/7/2020
12.2.1 126,772 9/28/2020
12.1.11 1,886 9/28/2020
12.1.10 82,994 9/24/2020
12.1.9 207,501 9/11/2020
12.1.2 605 9/11/2020
12.1.1 501,166 8/3/2020
12.0.13 8,021 8/2/2020
12.0.10 52,911 7/25/2020
12.0.9 39,584 7/21/2020
12.0.8 17,195 7/19/2020
12.0.7 521 7/19/2020
12.0.6 535 7/19/2020
12.0.5 48,383 7/11/2020
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12.0.1 44,217 6/20/2020
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11.0.8 543 6/16/2020
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11.0.5 32,718 5/6/2020
11.0.4 47,306 5/1/2020
11.0.3 3,239 4/30/2020
11.0.2 77,289 4/26/2020
11.0.1 596 4/26/2020
10.0.10 26,114 4/20/2020
10.0.9 19,715 4/17/2020
10.0.8 126,372 4/7/2020
10.0.7 10,626 4/3/2020
10.0.6 15,013 4/1/2020
10.0.5 607 4/1/2020
10.0.4 641 4/1/2020
10.0.1 133,663 3/21/2020
9.0.6 32,145 3/19/2020
9.0.5 44,389 3/16/2020
9.0.4 348,326 2/18/2020
9.0.3 1,364 2/18/2020
9.0.2 22,983 2/11/2020
9.0.1 817 2/11/2020
8.1.1 87,185 2/11/2020
8.0.6 758 2/11/2020
8.0.5 98,829 1/29/2020
8.0.4 3,321 1/27/2020
8.0.3 79,234 1/19/2020
7.1.10 94,276 1/17/2020
7.1.8 823 1/17/2020
7.1.4 60,343 1/13/2020
7.1.3 131,354 1/6/2020
7.1.1 319,789 12/21/2019
7.0.16 8,573 12/19/2019
7.0.15 81,232 12/5/2019
7.0.7 597,076 10/21/2019
7.0.5 33,645 10/11/2019
7.0.4 253,662 9/29/2019
6.0.38 74,413 9/26/2019
6.0.36 14,066 9/24/2019
6.0.34 6,260 9/24/2019
6.0.32 72,354 9/9/2019
6.0.27 95,621 9/3/2019
6.0.25 937 9/2/2019
6.0.23 46,640 8/26/2019
6.0.21 87,081 8/12/2019
6.0.19 49,217 8/9/2019
6.0.17 20,197 8/5/2019
6.0.15 139,491 7/9/2019
6.0.14 89,946 6/29/2019
6.0.13 1,102 6/28/2019
6.0.11 34,458 6/21/2019
6.0.9 791 6/21/2019
6.0.7 26,732 6/16/2019
6.0.6 657 6/16/2019
6.0.5 12,663 6/13/2019
6.0.3 32,179 6/13/2019
6.0.1 109,108 6/7/2019
5.0.1 49,902 6/3/2019
4.2.17 10,809 5/30/2019
4.2.15 17,545 5/28/2019
4.2.13 49,616 5/15/2019
4.2.12 2,857 5/15/2019
4.2.10 56,484 5/10/2019
4.2.9 119,141 5/10/2019
4.2.8 133,434 4/28/2019
4.2.4 49,062 4/19/2019
4.1.6 158,827 4/9/2019
4.0.11 98,691 3/30/2019
3.1.1 160,156 3/10/2019
3.0.10 543,409 1/5/2019
3.0.2 183,008 12/7/2018
2.2.18-beta 1,083 12/3/2018
2.2.17-beta 652 12/2/2018
2.2.16-beta 618 12/1/2018
2.2.15-beta 652 12/1/2018
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2.2.6-beta 714 10/30/2018
2.2.5-beta 672 10/30/2018
2.2.4-beta 677 10/30/2018
2.2.3-beta 680 10/29/2018
2.2.2-beta 678 10/25/2018
2.1.0.256 232,589 10/20/2018
2.1.0.247 85,657 10/15/2018
2.1.0.237 18,440 10/14/2018
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2.1.0.235 39,784 10/8/2018
2.1.0.234 946 10/8/2018
2.1.0.233 5,040 10/6/2018
2.1.0.232 4,683 10/4/2018
2.1.0.231 37,553 9/19/2018
2.1.0.230 70,889 9/8/2018
2.1.0.229 2,781 9/6/2018
2.1.0.228 92,438 8/27/2018
2.1.0.227 102,294 8/16/2018
2.1.0.226 11,155 8/14/2018
2.1.0.217 2,819 8/10/2018
2.1.0.216 5,574 8/9/2018
2.1.0.215 6,006 8/6/2018
2.1.0.214 1,364 8/5/2018
2.1.0.213 1,016 8/4/2018
2.1.0.211 32,350 7/25/2018
2.1.0.210 4,650 7/21/2018
2.1.0.209 65,874 7/20/2018
2.1.0.208 4,004 7/17/2018
2.1.0.207 1,009 7/17/2018
2.1.0.206 20,366 7/15/2018
2.1.0.205 1,600 7/12/2018
2.1.0.204 1,461 7/11/2018
2.1.0.203 1,150 7/11/2018
2.1.0.202 9,015 7/10/2018
2.1.0.201 2,828 7/10/2018
2.1.0.200 1,537 7/9/2018
2.1.0.199 1,136 7/9/2018
2.1.0.198 2,206 7/8/2018
2.1.0.197 1,134 7/8/2018
2.1.0.196 1,047 7/8/2018
2.1.0.195 1,096 7/7/2018
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2.1.0.186 34,039 7/6/2018
2.1.0.185 1,212 7/5/2018
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2.1.0.180 1,114 7/4/2018
2.1.0.179 1,129 7/4/2018
2.1.0.178 515,976 1/11/2018
2.1.0.177 9,473 1/2/2018
2.1.0.176 51,561 12/8/2017
2.1.0.175 62,348 11/16/2017
2.1.0.174 91,292 11/7/2017
2.1.0.173 1,345 11/7/2017
2.1.0.172 1,279 11/7/2017
2.1.0.171 1,906 11/4/2017
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2.1.0.166 1,293 11/4/2017
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2.1.0.159 43,364 10/22/2017
2.0.0.144 314,112 5/3/2017
2.0.0.143 296,770 4/7/2017
2.0.0.142 979 4/7/2017
2.0.0.141 13,797 3/2/2017
2.0.0.140 24,824 1/17/2017
2.0.0.139 11,921 1/6/2017
2.0.0.138 24,232 11/17/2016
2.0.0.137 26,334 10/14/2016
2.0.0.136 6,246 10/1/2016
2.0.0.124 411,906 2/8/2016
2.0.0.123 20,678 12/29/2015
2.0.0.122 1,323 12/28/2015
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2.0.0.102 1,150 2/7/2015
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2.0.0.100 1,333 1/25/2015
2.0.0.99 1,234 1/25/2015
2.0.0.98 1,810 1/25/2015
1.4.0.93 127,139 1/25/2015
1.4.0.92 57,161 9/29/2014
1.4.0.89 1,149 9/29/2014
1.4.0.88 1,123 9/29/2014
1.4.0.87 14,073 9/21/2014
1.4.0.86 351,754 5/7/2014
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1.4.0.84 3,315 4/7/2014
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1.4.0.82 1,216 3/24/2014
1.4.0.81 5,752 3/17/2014
1.4.0.80 1,233 3/17/2014
1.4.0.79 5,586 3/10/2014
1.4.0.78 2,240 3/2/2014
1.4.0.77 1,268 3/2/2014
1.4.0.76 2,772 2/21/2014
1.4.0.75 1,193 2/20/2014
1.4.0.74 25,500 1/12/2014
1.4.0.73 6,895 12/22/2013
1.4.0.72 5,084 12/1/2013
1.4.0.71 1,236 12/1/2013
1.4.0.70 1,586 11/21/2013
1.4.0.69 1,510 11/20/2013
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1.4.0.55 1,206 4/25/2013
1.4.0.54 1,180 4/25/2013
1.4.0.53 1,161 4/25/2013
1.4.0.52 1,219 4/25/2013
1.4.0.51 1,202 4/22/2013
1.4.0.50 1,176 4/22/2013
1.4.0.49 2,255 4/11/2013
1.4.0.48 2,060 3/24/2013
1.4.0.47 1,167 3/24/2013
1.4.0.46 1,176 3/24/2013
1.4.0.45 1,217 3/24/2013
1.4.0.44 1,983 3/16/2013
1.4.0.43 1,146 3/16/2013
1.4.0.42 1,194 3/16/2013
1.4.0.41 1,353 3/6/2013
1.4.0.40 3,963 12/24/2012
1.4.0.39 1,160 12/23/2012
1.4.0.38 1,161 12/23/2012
1.4.0.37 2,361 11/29/2012
1.4.0.36 1,243 11/29/2012
1.4.0.35 2,364 9/25/2012
1.4.0.34 1,254 9/25/2012
1.4.0.33 1,259 9/25/2012
1.4.0.32 5,169 7/14/2012
1.4.0.31 1,220 7/14/2012
1.4.0.30 1,199 7/12/2012
1.4.0.29 1,242 7/12/2012
1.4.0.28 1,187 7/12/2012
1.4.0.27 1,194 7/12/2012
1.4.0.26 1,278 7/2/2012
1.4.0.25 1,256 7/2/2012
1.4.0.24 3,434 5/15/2012
1.4.0.23 2,169 4/25/2012
1.4.0.22 1,200 4/25/2012
1.4.0.21 1,188 4/25/2012
1.4.0.20 1,799 4/18/2012
1.4.0.19 1,248 4/18/2012
1.4.0.18 1,208 4/18/2012
1.4.0.17 1,288 4/18/2012
1.4.0.14 1,251 4/4/2012
1.4.0.13 1,622 3/27/2012
1.4.0.12 2,016 9/16/2011
1.4.0.11 1,489 9/16/2011
1.3.0 1,763 5/27/2011
1.2.0 29,026 5/26/2011