System.IO.Abstractions 17.0.14

.NET 5.0 .NET Standard 2.0 .NET Framework 4.6.1
Install-Package System.IO.Abstractions -Version 17.0.14
dotnet add package System.IO.Abstractions --version 17.0.14
<PackageReference Include="System.IO.Abstractions" Version="17.0.14" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add System.IO.Abstractions --version 17.0.14
The NuGet Team does not provide support for this client. Please contact its maintainers for support.
#r "nuget: System.IO.Abstractions, 17.0.14"
#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=17.0.14

// Install System.IO.Abstractions as a Cake Tool
#tool nuget:?package=System.IO.Abstractions&version=17.0.14
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.
Version Downloads Last updated
17.0.14 35 5/18/2022
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17.0.12 2,281 5/16/2022
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17.0.10 4,694 5/12/2022
17.0.9 644 5/11/2022
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17.0.3 32,258 4/26/2022
17.0.2 116 4/26/2022
17.0.1 4,047 4/25/2022
16.1.26 6,758 4/24/2022
16.1.25 128,464 3/23/2022
16.1.24 7,503 3/22/2022
16.1.23 38,569 3/14/2022
16.1.22 2,852 3/11/2022
16.1.21 117 3/11/2022
16.1.20 19,202 3/8/2022
16.1.19 136 3/8/2022
16.1.18 134 3/8/2022
16.1.17 124 3/8/2022
16.1.16 12,470 3/3/2022
16.1.15 65,425 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 8,159 2/17/2022
16.1.10 95,911 2/4/2022
16.1.9 6,843 2/2/2022
16.1.8 126 2/2/2022
16.1.7 8,201 1/31/2022
16.1.6 141 1/31/2022
16.1.5 942 1/31/2022
16.1.4 117,779 1/12/2022
16.1.2 1,015 1/12/2022
16.1.1 20,795 1/11/2022
16.0.8 30,888 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 25,119 1/6/2022
16.0.2 2,694 1/6/2022
16.0.1 211,132 12/22/2021
15.0.1 1,211 12/22/2021
14.0.13 88,526 12/11/2021
14.0.12 157 12/11/2021
14.0.11 393 12/11/2021
14.0.10 307 12/11/2021
14.0.9 338 12/11/2021
14.0.8 442 12/11/2021
14.0.7 307 12/10/2021
14.0.6 169 12/10/2021
14.0.5 169 12/10/2021
14.0.4 360 12/10/2021
14.0.3 103,145 11/27/2021
14.0.2 2,004 11/26/2021
14.0.1 2,154 11/26/2021
13.2.47 1,272,269 8/25/2021
13.2.46 474 8/25/2021
13.2.45 290 8/25/2021
13.2.43 255,622 7/27/2021
13.2.42 187,814 7/23/2021
13.2.41 88,947 7/15/2021
13.2.40 2,321 7/14/2021
13.2.39 1,770 7/14/2021
13.2.38 215,010 6/15/2021
13.2.37 7,519 6/10/2021
13.2.36 349 6/10/2021
13.2.35 302 6/10/2021
13.2.34 310 6/10/2021
13.2.33 1,171,338 5/15/2021
13.2.32 418 5/15/2021
13.2.31 80,691 5/2/2021
13.2.30 468 5/2/2021
13.2.29 234,258 4/14/2021
13.2.28 435,161 3/25/2021
13.2.27 1,388 3/25/2021
13.2.25 629,561 3/9/2021
13.2.24 13,802 3/6/2021
13.2.23 130,707 2/24/2021
13.2.22 494 2/24/2021
13.2.20 8,979 2/23/2021
13.2.19 360 2/23/2021
13.2.18 678 2/23/2021
13.2.17 2,894 2/23/2021
13.2.16 535 2/22/2021
13.2.15 15,864 2/18/2021
13.2.14 431 2/18/2021
13.2.13 429 2/18/2021
13.2.12 365 2/18/2021
13.2.11 19,573 2/16/2021
13.2.10 121,284 2/10/2021
13.2.9 453,304 1/14/2021
13.2.8 119,606 12/22/2020
13.2.7 15,004 12/20/2020
13.2.6 53,855 12/16/2020
13.2.5 74,849 12/9/2020
13.2.4 32,432 12/5/2020
13.2.3 857 12/4/2020
13.2.2 102,981 11/26/2020
13.2.1 9,111 11/26/2020
13.1.2 563 11/25/2020
13.1.1 510 11/25/2020
13.0.1 97,436 11/21/2020
12.2.27 16,203 11/21/2020
12.2.26 3,020 11/20/2020
12.2.25 74,080 11/17/2020
12.2.24 76,299 11/15/2020
12.2.23 563 11/15/2020
12.2.22 685 11/14/2020
12.2.21 5,764 11/12/2020
12.2.20 1,816 11/12/2020
12.2.19 66,670 11/5/2020
12.2.7 279,714 10/15/2020
12.2.6 10,957 10/15/2020
12.2.5 73,176 10/12/2020
12.2.4 496 10/12/2020
12.2.3 45,768 10/12/2020
12.2.2 20,511 10/7/2020
12.2.1 126,471 9/28/2020
12.1.11 1,881 9/28/2020
12.1.10 82,955 9/24/2020
12.1.9 206,550 9/11/2020
12.1.2 604 9/11/2020
12.1.1 500,135 8/3/2020
12.0.13 8,004 8/2/2020
12.0.10 52,743 7/25/2020
12.0.9 39,435 7/21/2020
12.0.8 16,945 7/19/2020
12.0.7 520 7/19/2020
12.0.6 534 7/19/2020
12.0.5 48,316 7/11/2020
12.0.4 47,255 7/2/2020
12.0.3 12,014 6/29/2020
12.0.2 79,493 6/23/2020
12.0.1 44,180 6/20/2020
11.0.18 346,989 6/20/2020
11.0.17 4,311 6/19/2020
11.0.16 703 6/18/2020
11.0.15 7,551 6/18/2020
11.0.14 1,046 6/17/2020
11.0.13 1,035 6/17/2020
11.0.12 586 6/17/2020
11.0.11 1,180 6/17/2020
11.0.10 2,735 6/16/2020
11.0.9 450 6/16/2020
11.0.8 542 6/16/2020
11.0.7 416,830 5/28/2020
11.0.6 653,872 5/8/2020
11.0.5 32,538 5/6/2020
11.0.4 47,209 5/1/2020
11.0.3 3,233 4/30/2020
11.0.2 77,151 4/26/2020
11.0.1 595 4/26/2020
10.0.10 26,072 4/20/2020
10.0.9 19,692 4/17/2020
10.0.8 126,203 4/7/2020
10.0.7 10,573 4/3/2020
10.0.6 15,010 4/1/2020
10.0.5 606 4/1/2020
10.0.4 640 4/1/2020
10.0.1 133,416 3/21/2020
9.0.6 32,125 3/19/2020
9.0.5 44,305 3/16/2020
9.0.4 348,063 2/18/2020
9.0.3 1,363 2/18/2020
9.0.2 22,974 2/11/2020
9.0.1 816 2/11/2020
8.1.1 87,054 2/11/2020
8.0.6 757 2/11/2020
8.0.5 98,790 1/29/2020
8.0.4 3,317 1/27/2020
8.0.3 78,965 1/19/2020
7.1.10 93,932 1/17/2020
7.1.8 820 1/17/2020
7.1.4 60,226 1/13/2020
7.1.3 131,081 1/6/2020
7.1.1 318,468 12/21/2019
7.0.16 8,528 12/19/2019
7.0.15 81,117 12/5/2019
7.0.7 595,730 10/21/2019
7.0.5 33,624 10/11/2019
7.0.4 252,237 9/29/2019
6.0.38 73,974 9/26/2019
6.0.36 14,054 9/24/2019
6.0.34 6,251 9/24/2019
6.0.32 72,292 9/9/2019
6.0.27 95,075 9/3/2019
6.0.25 934 9/2/2019
6.0.23 46,414 8/26/2019
6.0.21 86,988 8/12/2019
6.0.19 49,212 8/9/2019
6.0.17 20,165 8/5/2019
6.0.15 139,301 7/9/2019
6.0.14 89,073 6/29/2019
6.0.13 1,099 6/28/2019
6.0.11 34,413 6/21/2019
6.0.9 788 6/21/2019
6.0.7 26,706 6/16/2019
6.0.6 654 6/16/2019
6.0.5 12,656 6/13/2019
6.0.3 32,155 6/13/2019
6.0.1 108,713 6/7/2019
5.0.1 49,692 6/3/2019
4.2.17 10,776 5/30/2019
4.2.15 17,542 5/28/2019
4.2.13 48,577 5/15/2019
4.2.12 2,834 5/15/2019
4.2.10 56,466 5/10/2019
4.2.9 119,138 5/10/2019
4.2.8 133,427 4/28/2019
4.2.4 48,981 4/19/2019
4.1.6 158,626 4/9/2019
4.0.11 98,463 3/30/2019
3.1.1 159,785 3/10/2019
3.0.10 541,501 1/5/2019
3.0.2 182,569 12/7/2018
2.2.18-beta 1,080 12/3/2018
2.2.17-beta 649 12/2/2018
2.2.16-beta 617 12/1/2018
2.2.15-beta 649 12/1/2018
2.2.14-beta 631 12/1/2018
2.2.13-beta 677 12/1/2018
2.2.12-beta 679 12/1/2018
2.2.11-beta 630 12/1/2018
2.2.10-beta 596 11/28/2018
2.2.9-beta 879 11/16/2018
2.2.8-beta 11,162 11/9/2018
2.2.7-beta 742 11/5/2018
2.2.6-beta 711 10/30/2018
2.2.5-beta 669 10/30/2018
2.2.4-beta 674 10/30/2018
2.2.3-beta 677 10/29/2018
2.2.2-beta 675 10/25/2018
2.1.0.256 232,313 10/20/2018
2.1.0.247 85,630 10/15/2018
2.1.0.237 18,408 10/14/2018
2.1.0.236 83,192 10/10/2018
2.1.0.235 39,772 10/8/2018
2.1.0.234 943 10/8/2018
2.1.0.233 5,033 10/6/2018
2.1.0.232 4,671 10/4/2018
2.1.0.231 37,538 9/19/2018
2.1.0.230 70,720 9/8/2018
2.1.0.229 2,778 9/6/2018
2.1.0.228 92,235 8/27/2018
2.1.0.227 101,979 8/16/2018
2.1.0.226 11,143 8/14/2018
2.1.0.217 2,816 8/10/2018
2.1.0.216 5,571 8/9/2018
2.1.0.215 5,981 8/6/2018
2.1.0.214 1,363 8/5/2018
2.1.0.213 1,013 8/4/2018
2.1.0.211 32,342 7/25/2018
2.1.0.210 4,647 7/21/2018
2.1.0.209 65,416 7/20/2018
2.1.0.208 4,001 7/17/2018
2.1.0.207 1,006 7/17/2018
2.1.0.206 20,187 7/15/2018
2.1.0.205 1,597 7/12/2018
2.1.0.204 1,458 7/11/2018
2.1.0.203 1,147 7/11/2018
2.1.0.202 9,012 7/10/2018
2.1.0.201 2,825 7/10/2018
2.1.0.200 1,534 7/9/2018
2.1.0.199 1,133 7/9/2018
2.1.0.198 2,205 7/8/2018
2.1.0.197 1,131 7/8/2018
2.1.0.196 1,044 7/8/2018
2.1.0.195 1,093 7/7/2018
2.1.0.194 1,111 7/7/2018
2.1.0.193 1,094 7/7/2018
2.1.0.192 6,808 7/7/2018
2.1.0.191 1,094 7/7/2018
2.1.0.190 1,071 7/7/2018
2.1.0.189 1,127 7/7/2018
2.1.0.188 1,041 7/6/2018
2.1.0.187 12,492 7/6/2018
2.1.0.186 34,033 7/6/2018
2.1.0.185 1,209 7/5/2018
2.1.0.184 9,419 7/4/2018
2.1.0.183 1,123 7/4/2018
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2.1.0.180 1,111 7/4/2018
2.1.0.179 1,126 7/4/2018
2.1.0.178 515,111 1/11/2018
2.1.0.177 9,452 1/2/2018
2.1.0.176 51,491 12/8/2017
2.1.0.175 62,279 11/16/2017
2.1.0.174 90,991 11/7/2017
2.1.0.173 1,342 11/7/2017
2.1.0.172 1,276 11/7/2017
2.1.0.171 1,903 11/4/2017
2.1.0.170 1,602 11/4/2017
2.1.0.169 1,285 11/4/2017
2.1.0.168 1,281 11/4/2017
2.1.0.166 1,290 11/4/2017
2.1.0.164 1,267 11/4/2017
2.1.0.163 1,252 11/4/2017
2.1.0.159 43,325 10/22/2017
2.0.0.144 313,827 5/3/2017
2.0.0.143 296,532 4/7/2017
2.0.0.142 975 4/7/2017
2.0.0.141 13,782 3/2/2017
2.0.0.140 24,813 1/17/2017
2.0.0.139 11,785 1/6/2017
2.0.0.138 24,156 11/17/2016
2.0.0.137 26,290 10/14/2016
2.0.0.136 6,232 10/1/2016
2.0.0.124 411,268 2/8/2016
2.0.0.123 20,663 12/29/2015
2.0.0.122 1,318 12/28/2015
2.0.0.121 1,266 12/28/2015
2.0.0.120 7,564 12/6/2015
2.0.0.119 1,311 12/6/2015
2.0.0.118 11,875 11/4/2015
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2.0.0.108 2,798 3/4/2015
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2.0.0.103 6,136 2/7/2015
2.0.0.102 1,147 2/7/2015
2.0.0.101 4,528 1/25/2015
2.0.0.100 1,328 1/25/2015
2.0.0.99 1,231 1/25/2015
2.0.0.98 1,805 1/25/2015
1.4.0.93 126,992 1/25/2015
1.4.0.92 57,091 9/29/2014
1.4.0.89 1,143 9/29/2014
1.4.0.88 1,120 9/29/2014
1.4.0.87 14,070 9/21/2014
1.4.0.86 351,424 5/7/2014
1.4.0.85 2,741 4/23/2014
1.4.0.84 3,311 4/7/2014
1.4.0.83 21,737 3/24/2014
1.4.0.82 1,209 3/24/2014
1.4.0.81 5,737 3/17/2014
1.4.0.80 1,227 3/17/2014
1.4.0.79 5,574 3/10/2014
1.4.0.78 2,234 3/2/2014
1.4.0.77 1,262 3/2/2014
1.4.0.76 2,762 2/21/2014
1.4.0.75 1,187 2/20/2014
1.4.0.74 25,459 1/12/2014
1.4.0.73 6,866 12/22/2013
1.4.0.72 5,060 12/1/2013
1.4.0.71 1,230 12/1/2013
1.4.0.70 1,580 11/21/2013
1.4.0.69 1,506 11/20/2013
1.4.0.68 3,434 10/15/2013
1.4.0.67 1,200 10/15/2013
1.4.0.66 20,183 7/31/2013
1.4.0.65 3,244 7/9/2013
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1.4.0.62 1,206 4/26/2013
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1.4.0.59 1,131 4/25/2013
1.4.0.58 1,209 4/25/2013
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1.4.0.55 1,200 4/25/2013
1.4.0.54 1,174 4/25/2013
1.4.0.53 1,155 4/25/2013
1.4.0.52 1,213 4/25/2013
1.4.0.51 1,195 4/22/2013
1.4.0.50 1,170 4/22/2013
1.4.0.49 2,249 4/11/2013
1.4.0.48 2,046 3/24/2013
1.4.0.47 1,161 3/24/2013
1.4.0.46 1,170 3/24/2013
1.4.0.45 1,211 3/24/2013
1.4.0.44 1,977 3/16/2013
1.4.0.43 1,140 3/16/2013
1.4.0.42 1,188 3/16/2013
1.4.0.41 1,349 3/6/2013
1.4.0.40 3,959 12/24/2012
1.4.0.39 1,154 12/23/2012
1.4.0.38 1,157 12/23/2012
1.4.0.37 2,355 11/29/2012
1.4.0.36 1,237 11/29/2012
1.4.0.35 2,357 9/25/2012
1.4.0.34 1,248 9/25/2012
1.4.0.33 1,253 9/25/2012
1.4.0.32 5,163 7/14/2012
1.4.0.31 1,214 7/14/2012
1.4.0.30 1,193 7/12/2012
1.4.0.29 1,236 7/12/2012
1.4.0.28 1,183 7/12/2012
1.4.0.27 1,187 7/12/2012
1.4.0.26 1,274 7/2/2012
1.4.0.25 1,250 7/2/2012
1.4.0.24 3,427 5/15/2012
1.4.0.23 2,163 4/25/2012
1.4.0.22 1,194 4/25/2012
1.4.0.21 1,184 4/25/2012
1.4.0.20 1,793 4/18/2012
1.4.0.19 1,242 4/18/2012
1.4.0.18 1,204 4/18/2012
1.4.0.17 1,282 4/18/2012
1.4.0.14 1,245 4/4/2012
1.4.0.13 1,616 3/27/2012
1.4.0.12 2,010 9/16/2011
1.4.0.11 1,485 9/16/2011
1.3.0 1,757 5/27/2011
1.2.0 29,012 5/26/2011