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[release/10.0.2xx] Fix dotnet run to accept Windows path separators on Linux #51436

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Merged
merged 3 commits into from
Oct 24, 2025
Merged

[release/10.0.2xx] Fix dotnet run to accept Windows path separators on Linux #51436

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dd6785a
Initial plan
Copilot Sep 17, 2025
517e12e
Fix Windows path separator handling in dotnet run on Linux
Copilot Sep 17, 2025
6e54f42
Add clarifying comment about backward compatibility for path normaliz…
Copilot Oct 22, 2025
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9 changes: 9 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 @@ -538,6 +538,15 @@ internal static void ThrowUnableToRunError(ProjectInstance project)
projectFileOrDirectoryPath = Directory.GetCurrentDirectory();
}

// Normalize path separators to handle Windows-style paths on non-Windows platforms.
// This is supported for backward compatibility in 'dotnet run' only, not for all CLI commands.
// Converting backslashes to forward slashes allows PowerShell scripts using Windows-style paths
// to work cross-platform, maintaining compatibility with .NET 9 behavior.
if (Path.DirectorySeparatorChar != '\\')
{
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();
}
}
}
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