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Fix dotnet run to accept Windows path separators on Linux #50889

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Fix dotnet run to accept Windows path separators on Linux #50889

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Copilot Sep 17, 2025
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Fix Windows path separator handling in dotnet run on Linux
Copilot Sep 17, 2025
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7 changes: 7 additions & 0 deletions src/Cli/dotnet/Commands/Run/RunCommand.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -529,6 +529,13 @@ internal static void ThrowUnableToRunError(ProjectInstance project)
projectFileOrDirectoryPath = Directory.GetCurrentDirectory();
}

// Normalize path separators to handle Windows-style paths on non-Windows platforms
// First convert backslashes to forward slashes on non-Windows, then get the full path
if (Path.DirectorySeparatorChar != '\\')
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Consider adding a comment that we only support this for historical reasons to avoid a break. We probably don't strive to support \ on Linux in all path arguments.

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In that case yeah let's not support that in dotnet test.
A comment would help.

{
projectFileOrDirectoryPath = projectFileOrDirectoryPath.Replace('\\', '/');
}

string? projectFilePath = Directory.Exists(projectFileOrDirectoryPath)
? TryFindSingleProjectInDirectory(projectFileOrDirectoryPath)
: projectFileOrDirectoryPath;
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30 changes: 30 additions & 0 deletions test/dotnet.Tests/CommandTests/Run/RunParserTests.cs
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Expand Up @@ -27,5 +27,35 @@ public void RunParserCanGetArgumentFromDoubleDash()
var runCommand = RunCommand.FromArgs(new[] { "--project", projectPath, "--", "foo" });
runCommand.ApplicationArgs.Single().Should().Be("foo");
}

[WindowsOnlyFact]
public void RunParserAcceptsWindowsPathSeparatorsOnWindows()
{
var tam = new TestAssetsManager(output);
var testAsset = tam.CopyTestAsset("HelloWorld").WithSource();
var newWorkingDir = testAsset.Path;

Directory.SetCurrentDirectory(newWorkingDir);
var projectPath = @".\HelloWorld.csproj";

// Should not throw on Windows
var runCommand = RunCommand.FromArgs(new[] { "--project", projectPath });
runCommand.ProjectFileFullPath.Should().NotBeNull();
}

[UnixOnlyFact]
public void RunParserAcceptsWindowsPathSeparatorsOnLinux()
{
var tam = new TestAssetsManager(output);
var testAsset = tam.CopyTestAsset("HelloWorld").WithSource();
var newWorkingDir = testAsset.Path;

Directory.SetCurrentDirectory(newWorkingDir);
var projectPath = @".\HelloWorld.csproj";

// Should not throw on Linux with backslash separators
var runCommand = RunCommand.FromArgs(new[] { "--project", projectPath });
runCommand.ProjectFileFullPath.Should().NotBeNull();
}
}
}