Merge branch 'main' into merge/release/10.0.2xx-to-main

Author: SimonZhao888

eng/Version.Details.props

@@ -140,8 +140,8 @@ This file should be imported by eng/Versions.props
     <!-- dotnet/core-setup dependencies -->
     <NETStandardLibraryRefPackageVersion>2.1.0</NETStandardLibraryRefPackageVersion>
     <!-- microsoft/testfx dependencies -->
-    <MicrosoftTestingPlatformPackageVersion>2.1.0-preview.25523.1</MicrosoftTestingPlatformPackageVersion>
-    <MSTestPackageVersion>4.1.0-preview.25523.1</MSTestPackageVersion>
+    <MicrosoftTestingPlatformPackageVersion>2.1.0-preview.25525.1</MicrosoftTestingPlatformPackageVersion>
+    <MSTestPackageVersion>4.1.0-preview.25525.1</MSTestPackageVersion>
   </PropertyGroup>
   <!--Property group for alternate package version names-->
   <PropertyGroup>

eng/Version.Details.xml

@@ -553,13 +553,13 @@
       <Uri>https://github.com/dotnet/dotnet</Uri>
       <Sha>be28ec777bf12db631725399c442448d52093087</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Testing.Platform" Version="2.1.0-preview.25523.1">
+    <Dependency Name="Microsoft.Testing.Platform" Version="2.1.0-preview.25525.1">
       <Uri>https://github.com/microsoft/testfx</Uri>
-      <Sha>b349d2e4c023548494bc5f2f031a08376a287563</Sha>
+      <Sha>82daaae2be64c7d3058a15656781bbf790e4e628</Sha>
     </Dependency>
-    <Dependency Name="MSTest" Version="4.1.0-preview.25523.1">
+    <Dependency Name="MSTest" Version="4.1.0-preview.25525.1">
       <Uri>https://github.com/microsoft/testfx</Uri>
-      <Sha>b349d2e4c023548494bc5f2f031a08376a287563</Sha>
+      <Sha>82daaae2be64c7d3058a15656781bbf790e4e628</Sha>
     </Dependency>
     <Dependency Name="Microsoft.Extensions.Configuration.Ini" Version="10.0.0-rc.1.25515.110">
       <Uri>https://github.com/dotnet/dotnet</Uri>

src/Cli/dotnet/Commands/Run/RunCommand.cs

@@ -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;

test/dotnet.Tests/CommandTests/Run/RunParserTests.cs

@@ -27,5 +27,33 @@ 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();
+        }
     }
 }