Merge main into live

.github/workflows/scorecards.yml

@@ -63,14 +63,14 @@ jobs:
       # Upload the results as artifacts (optional). Commenting out will disable uploads of run results in SARIF
       # format to the repository Actions tab.
       - name: "Upload artifact"
-        uses: actions/upload-artifact@65c4c4a1ddee5b72f698fdd19549f0f0fb45cf08 # v4.6.0
+        uses: actions/upload-artifact@4cec3d8aa04e39d1a68397de0c4cd6fb9dce8ec1 # v4.6.1
         with:
           name: SARIF file
           path: results.sarif
           retention-days: 5
 
       # Upload the results to GitHub's code scanning dashboard.
       - name: "Upload to code-scanning"
-        uses: github/codeql-action/upload-sarif@9e8d0789d4a0fa9ceb6b1738f7e269594bdd67f0 # v3.28.9
+        uses: github/codeql-action/upload-sarif@b56ba49b26e50535fa1e7f7db0f4f7b4bf65d80d # v3.28.10
         with:
           sarif_file: results.sarif

docs/core/compatibility/core-libraries/9.0/ambiguous-overload.md

@@ -0,0 +1,48 @@
+---
+title: "Breaking change: Ambiguous overload resolution affecting StringValues implicit operators"
+description: Learn about the .NET 9 breaking change in core .NET libraries where ambiguous overload resolution now throws error CS0121.
+ms.date: 02/24/2025
+ai-usage: ai-assisted
+---
+
+# Ambiguous overload resolution affecting StringValues implicit operators
+
+In .NET 9, a breaking change in the [`params Span<T>` lang feature](../../../whats-new/dotnet-9/libraries.md#params-readonlyspant-overloads) creates ambiguity with the implicit operators of <xref:Microsoft.Extensions.Primitives.StringValues>. This change results in the compiler throwing error `CS0121` when it encounters ambiguous method calls.
+
+## Previous behavior
+
+The APIs mentioned in the [Affected APIs](#affected-apis) section previously had no overloads ambiguous with the implicit operators of <xref:Microsoft.Extensions.Primitives.StringValues>. As a result, the compiler would resolve the overloads without any issues.
+
+## New behavior
+
+The compiler throws error `CS0121` when encountering these ambiguous overloads, resulting in the following error:
+
+```output
+CS0121: The call is ambiguous between the following methods or properties: 'Program.Join(string, params string[])' and 'Program.Join(string, params ReadOnlySpan<string>)'
+```
+
+## Version introduced
+
+.NET 9
+
+## Type of breaking change
+
+This change is a [source compatibility](../../categories.md#source-compatibility) change.
+
+## Reason for change
+
+<xref:Microsoft.Extensions.Primitives.StringValues> has implicit operators for `string` and `string[]` that cause conflicts with the [`params Span<T>` lang feature](../../../whats-new/dotnet-9/libraries.md#params-readonlyspant-overloads).
+
+## Recommended action
+
+Explicitly specify the method you intend to call by casting the arguments to the appropriate type or apply named parameters.
+
+## Affected APIs
+
+- <xref:System.String.Concat(System.ReadOnlySpan{System.String})?displayProperty=fullName>
+- <xref:System.String.Join(System.Char,System.ReadOnlySpan{System.String})?displayProperty=fullName>
+- <xref:System.String.Join(System.String,System.ReadOnlySpan{System.String})?displayProperty=fullName>
+- <xref:System.IO.Path.Combine(System.ReadOnlySpan{System.String})?displayProperty=fullName>
+- <xref:System.IO.Path.Join(System.ReadOnlySpan{System.String})?displayProperty=fullName>
+- <xref:System.Text.StringBuilder.AppendJoin(System.String,System.ReadOnlySpan{System.String})?displayProperty=fullName>
+- <xref:System.Text.StringBuilder.AppendJoin(System.Char,System.ReadOnlySpan{System.Object})?displayProperty=fullName>

docs/core/compatibility/toc.yml

@@ -74,6 +74,8 @@ items:
                 href: core-libraries/9.0/compressionlevel-bits.md
               - name: Altered UnsafeAccessor support for non-open generics
                 href: core-libraries/9.0/unsafeaccessor-generics.md
+              - name: Ambiguous overload resolution affecting StringValues implicit operators
+                href: core-libraries/9.0/ambiguous-overload.md         
               - name: API obsoletions with custom diagnostic IDs
                 href: core-libraries/9.0/obsolete-apis-with-custom-diagnostics.md
               - name: BigInteger maximum length
@@ -1366,6 +1368,8 @@ items:
                 href: core-libraries/9.0/compressionlevel-bits.md
               - name: Altered UnsafeAccessor support for non-open generics
                 href: core-libraries/9.0/unsafeaccessor-generics.md
+              - name: Ambiguous overload resolution affecting StringValues implicit operators
+                href: core-libraries/9.0/ambiguous-overload.md    
               - name: API obsoletions with custom diagnostic IDs
                 href: core-libraries/9.0/obsolete-apis-with-custom-diagnostics.md
               - name: BigInteger maximum length

docs/core/install/linux.md

@@ -19,16 +19,17 @@ This article describes how .NET is available on various Linux distributions. .NE
 
 ## Packages
 
-Starting with .NET 9, Microsoft only publishes packages for supported Linux distributions that don't publish their own packages. Packages are published in the Microsoft package repository at <https://packages.microsoft.com/>. This includes the following Linux distributions:
+Packages are available for the following Linux distributions:
 
-- Azure Linux 3.0
+- Azure Linux
 - [Debian](linux-debian.md)
 - [openSUSE Leap](linux-opensuse.md)
 - [SUSE Enterprise Linux](linux-sles.md)
 
-The following Linux distributions officially support .NET, and publish their own .NET packages:
+Packages are published in the Microsoft package repository at <https://packages.microsoft.com/>. Distributions are selected per the policy defined at [dotnet/core #9556](https://github.com/dotnet/core/discussions/9556).
+
+The following Linux distributions publish their own .NET packages:
 
-- Azure Linux 2.0 (CBL-Mariner)
 - [Alpine](linux-alpine.md)
 - [CentOS Stream](linux-rhel.md#centos-stream-9)
 - [Fedora](linux-fedora.md)

docs/core/tools/dotnet-sln.md

@@ -1,15 +1,15 @@
 ---
 title: dotnet sln command
 description: The dotnet-sln command provides a convenient option to add, remove, and list projects in a solution file.
-ms.date: 05/18/2022
+ms.date: 02/24/2025
 ---
 # dotnet sln
 
 **This article applies to:** ✔️ .NET Core 3.1 SDK and later versions
 
 ## Name
 
-`dotnet sln` - Lists or modifies the projects in a .NET solution file.
+`dotnet sln` - Lists or modifies the projects in a .NET solution file, or migrates the file to an *.slnx* file.
 
 ## Synopsis
 
@@ -49,14 +49,23 @@ dotnet new sln --output MySolution
 
 - **`SOLUTION_FILE`**
 
-  The solution file to use. If this argument is omitted, the command searches the current directory for one. If it finds no solution file or multiple solution files, the command fails.
+  The solution file to use (either an *.sln* or *.slnx* file).
+
+  If unspecified, the command searches the current directory for an *.sln* or *.slnx* file and, if it finds exactly one, uses that file. If multiple solution files are found, the user is prompted to specify a file explicitly. If none are found, the command fails.
 
 ## Options
 
 [!INCLUDE [help](../../../includes/cli-help.md)]
 
 ## Commands
 
+The following commands are available:
+
+- [`list`](#list)
+- [`add`](#add)
+- [`remove`](#remove)
+- [`migrate`](#migrate)
+
 ### `list`
 
 Lists all projects in a solution file.
@@ -71,7 +80,9 @@ dotnet sln list [-h|--help]
 
 - **`SOLUTION_FILE`**
 
-  The solution file to use. If this argument is omitted, the command searches the current directory for one. If it finds no solution file or multiple solution files, the command fails.
+  The solution file to use (either an *.sln* or *.slnx* file).
+
+  If unspecified, the command searches the current directory for an *.sln* or *.slnx* file and, if it finds exactly one, uses that file. If multiple solution files are found, the user is prompted to specify a file explicitly. If none are found, the command fails.
 
 #### Options
 
@@ -92,7 +103,9 @@ dotnet sln add [-h|--help]
 
 - **`SOLUTION_FILE`**
 
-  The solution file to use. If it is unspecified, the command searches the current directory for one and fails if there are multiple solution files.
+  The solution file to use (either an *.sln* or *.slnx* file).
+
+  If unspecified, the command searches the current directory for an *.sln* or *.slnx* file and, if it finds exactly one, uses that file. If multiple solution files are found, the user is prompted to specify a file explicitly. If none are found, the command fails.
 
 - **`PROJECT_PATH`**
 
@@ -135,7 +148,9 @@ dotnet sln [<SOLUTION_FILE>] remove [-h|--help]
 
 - **`SOLUTION_FILE`**
 
-  The solution file to use. If it is unspecified, the command searches the current directory for one and fails if there are multiple solution files.
+  The solution file to use (either an *.sln* or *.slnx* file).
+
+  If unspecified, the command searches the current directory for an *.sln* or *.slnx* file and, if it finds exactly one, uses that file. If multiple solution files are found, the user is prompted to specify a file explicitly. If none are found, the command fails.
 
 - **`PROJECT_PATH`**
 
@@ -145,12 +160,37 @@ dotnet sln [<SOLUTION_FILE>] remove [-h|--help]
 
 [!INCLUDE [help](../../../includes/cli-help.md)]
 
+### `migrate`
+
+Generates an *.slnx* solution file from an *.sln* file.
+
+#### Synopsis
+
+```dotnetcli
+dotnet sln [<SOLUTION_FILE>] migrate
+dotnet sln [<SOLUTION_FILE>] migrate [-h|--help]
+```
+
+#### Arguments
+
+- **`SOLUTION_FILE`**
+
+  The *.sln* solution file to migrate.
+
+  If unspecified, the command searches the current directory for an *.sln* file and, if it finds exactly one, uses that file. If multiple *.sln* files are found, the user is prompted to specify a file explicitly. If none are found, the command fails.
+
+  If you specify an *.slnx* file instead of an *.sln* file, or if an *.slnx* file with the same file name (minus the *.sln* extension) already exists in the directory, the command fails.
+
+#### Options
+
+[!INCLUDE [help](../../../includes/cli-help.md)]
+
 ## Examples
 
 - List the projects in a solution:
 
   ```dotnetcli
-  dotnet sln todo.sln list
+  dotnet sln todo.slnx list
   ```
 
 - Add a C# project to a solution:
@@ -168,43 +208,49 @@ dotnet sln [<SOLUTION_FILE>] remove [-h|--help]
 - Add multiple C# projects to the root of a solution:
 
   ```dotnetcli
-  dotnet sln todo.sln add todo-app/todo-app.csproj back-end/back-end.csproj --in-root
+  dotnet sln todo.slnx add todo-app/todo-app.csproj back-end/back-end.csproj --in-root
   ```
 
 - Add multiple C# projects to a solution:
 
   ```dotnetcli
-  dotnet sln todo.sln add todo-app/todo-app.csproj back-end/back-end.csproj
+  dotnet sln todo.slnx add todo-app/todo-app.csproj back-end/back-end.csproj
   ```
 
 - Remove multiple C# projects from a solution:
 
   ```dotnetcli
-  dotnet sln todo.sln remove todo-app/todo-app.csproj back-end/back-end.csproj
+  dotnet sln todo.slnx remove todo-app/todo-app.csproj back-end/back-end.csproj
   ```
 
 - Add multiple C# projects to a solution using a globbing pattern (Unix/Linux only):
 
   ```dotnetcli
-  dotnet sln todo.sln add **/*.csproj
+  dotnet sln todo.slnx add **/*.csproj
   ```
 
 - Add multiple C# projects to a solution using a globbing pattern (Windows PowerShell only):
 
   ```dotnetcli
-  dotnet sln todo.sln add (ls -r **/*.csproj)
+  dotnet sln todo.slnx add (ls -r **/*.csproj)
   ```
 
 - Remove multiple C# projects from a solution using a globbing pattern (Unix/Linux only):
 
   ```dotnetcli
-  dotnet sln todo.sln remove **/*.csproj
+  dotnet sln todo.slnx remove **/*.csproj
   ```
 
 - Remove multiple C# projects from a solution using a globbing pattern (Windows PowerShell only):
 
   ```dotnetcli
-  dotnet sln todo.sln remove (ls -r **/*.csproj)
+  dotnet sln todo.slnx remove (ls -r **/*.csproj)
+  ```
+
+- Generate an *.slnx* file from a *.sln* file:
+
+  ```dotnetcli
+  dotnet sln todo.sln migrate
   ```
 
 - Create a solution, a console app, and two class libraries. Add the projects to the solution, and use the `--solution-folder` option of `dotnet sln` to organize the class libraries into a solution folder.
@@ -214,9 +260,9 @@ dotnet sln [<SOLUTION_FILE>] remove [-h|--help]
   dotnet new console -o myapp
   dotnet new classlib -o mylib1
   dotnet new classlib -o mylib2
-  dotnet sln mysolution.sln add myapp\myapp.csproj
-  dotnet sln mysolution.sln add mylib1\mylib1.csproj --solution-folder mylibs
-  dotnet sln mysolution.sln add mylib2\mylib2.csproj --solution-folder mylibs
+  dotnet sln mysolution.slnx add myapp\myapp.csproj
+  dotnet sln mysolution.slnx add mylib1\mylib1.csproj --solution-folder mylibs
+  dotnet sln mysolution.slnx add mylib2\mylib2.csproj --solution-folder mylibs
   ```
 
   The following screenshot shows the result in Visual Studio 2019 **Solution Explorer**:

docs/core/tools/dotnet-test.md

@@ -17,7 +17,7 @@ Some examples of the `dotnet.config` file:
 
   ```toml
   [dotnet.test:runner]
-  name = "MicrosoftTestingPlatform"
+  name = "Microsoft.Testing.Platform"
   ```
 
   ```toml

docs/core/whats-new/dotnet-10/overview.md

@@ -11,7 +11,7 @@ ai-usage: ai-assisted
 
 Learn about the new features in .NET 10 and find links to further documentation. This page has been updated for Preview 1.
 
-.NET 10, the successor to [.NET 9](../dotnet-9/overview.md) and will be [supported for 3 years](https://dotnet.microsoft.com/platform/support/policy/dotnet-core) as a long-term support (LTS) release. You can [download .NET 10 here](https://get.dot.net/10).
+.NET 10, the successor to [.NET 9](../dotnet-9/overview.md), will be [supported for 3 years](https://dotnet.microsoft.com/platform/support/policy/dotnet-core) as a long-term support (LTS) release. You can [download .NET 10 here](https://get.dot.net/10).
 
 Your feedback is important and appreciated. If you have questions or comments, please use the discussion on [GitHub](https://github.com/dotnet/core/discussions/categories/news).
 
@@ -43,7 +43,7 @@ For more information, see [What's new in the SDK for .NET 10](sdk.md).
 
 .NET Aspire releases version 9.1, which focuses on quality-of-life fixes.
 
-For more information, see [.NET Aspire — what's new?](/dotnet/aspire/whats-new/).
+For more information, see [What's new in .NET Aspire 9.1](/dotnet/aspire/whats-new/dotnet-aspire-9.1).
 
 ## ASP.NET Core
 

docs/csharp/whats-new/csharp-14.md

@@ -34,7 +34,7 @@ private string _msg;
 public string Message
 {
     get => _msg;
-    set => _msg = value ?? throw new NullArgumentException(nameof(value));
+    set => _msg = value ?? throw new ArgumentNullException(nameof(value));
 }
 ```
 

samples/snippets/csharp/roslyn-sdk/SyntaxQuickStart/HelloSyntaxTree/HelloSyntaxTree.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.12.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.13.0" />
   </ItemGroup>
 
 </Project>

samples/snippets/csharp/roslyn-sdk/SyntaxQuickStart/SyntaxWalker/SyntaxWalker.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.12.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.13.0" />
   </ItemGroup>
 
 </Project>