.Net: Migrate sln to slnx (#12325)

### Motivation and Context

<!-- Thank you for your contribution to the semantic-kernel repo!
Please help reviewers and future users, providing the following
information:
  1. Why is this change required?
  2. What problem does it solve?
  3. What scenario does it contribute to?
  4. If it fixes an open issue, please link to the issue here.
-->

Replaced `sln` with `slnx` solution file:

https://devblogs.microsoft.com/visualstudio/new-simpler-solution-file-format/

### Description

<!-- Describe your changes, the overall approach, the underlying design.
These notes will help understanding how your code works. Thanks! -->

### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [x] The code builds clean without any errors or warnings
- [x] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [x] All unit tests pass, and I have added new tests where possible
- [x] I didn't break anyone 😄

---------

Co-authored-by: Shay Rojansky <[email protected]>
Co-authored-by: Roger Barreto <[email protected]>

Author: 3 people

.github/_typos.toml

@@ -23,7 +23,7 @@ extend-exclude = [
     "PopulationByCountry.csv",
     "PopulationByAdmin1.csv",
     "WomensSuffrage.txt",
-    "SK-dotnet.sln.DotSettings",
+    "SK-dotnet.slnx.DotSettings",
     "**/azure_ai_search_hotel_samples/README.md",
     "**/Demos/ProcessFrameworkWithAspire/ProcessFramework.Aspire/ProcessFramework.Aspire.ProcessOrchestrator/Program.cs",
     "**/Demos/ProcessFrameworkWithAspire/**/*.http",

.github/workflows/dotnet-build-and-test.yml

@@ -72,28 +72,43 @@ jobs:
       - uses: actions/checkout@v4
         with:
           persist-credentials: false
-      - name: Setup dotnet ${{ matrix.dotnet }}
-        uses: actions/setup-dotnet@v3
+
+      - name: Setup dotnet
+        uses: actions/[email protected]
         with:
-          dotnet-version: ${{ matrix.dotnet }}
+          global-json-file: ${{ github.workspace }}/dotnet/global.json
+
       - name: Build dotnet solutions
         shell: bash
         run: |
-          export SOLUTIONS=$(find ./dotnet/ -type f -name "*.sln" | tr '\n' ' ')
+          export SOLUTIONS=$(find ./dotnet/ -type f -name "*.slnx" | tr '\n' ' ')
           for solution in $SOLUTIONS; do
             dotnet build $solution -c ${{ matrix.configuration }} --warnaserror
           done
+
       - name: Package install check
         shell: bash
-        if: matrix.os == 'ubuntu-latest'
         run: |
-          export SOLUTIONS=$(find ./dotnet/ -type f -name "*.sln" | tr '\n' ' ')
+          export SOLUTIONS=$(find ./dotnet/ -type f -name "*.slnx" | tr '\n' ' ')
           for solution in $SOLUTIONS; do
             dotnet pack $solution -c ${{ matrix.configuration }} --no-build --no-restore --output ./artifacts
           done
           dotnet new console --name packcheck --output consoleapp
-          dotnet add consoleapp/packcheck.csproj package Microsoft.SemanticKernel --source ./artifacts
-          dotnet build consoleapp/packcheck.csproj
+
+          # Create minimal nuget.config and use only dotnet nuget commands
+          echo '<?xml version="1.0" encoding="utf-8"?><configuration><packageSources><clear /></packageSources></configuration>' > consoleapp/nuget.config
+
+          # Add sources with local first using dotnet nuget commands
+          dotnet nuget add source ../artifacts --name local --configfile consoleapp/nuget.config
+          dotnet nuget add source https://api.nuget.org/v3/index.json --name nuget.org --configfile consoleapp/nuget.config
+
+          # Change to project directory to ensure local nuget.config is used
+          cd consoleapp
+          dotnet add packcheck.csproj package Microsoft.SemanticKernel
+          dotnet build -c ${{ matrix.configuration }} packcheck.csproj
+          cd ..
+
+          # Clean up
           rm -rf ./artifacts
           rm -rf ./consoleapp
 

.github/workflows/dotnet-ci.yml

@@ -31,7 +31,7 @@ jobs:
 
     - name: Find solutions
       shell: bash
-      run: echo "solutions=$(find ./ -type f -name "*.sln" | tr '\n' ' ')" >> $GITHUB_ENV
+      run: echo "solutions=$(find ./ -type f -name "*.slnx" | tr '\n' ' ')" >> $GITHUB_ENV
 
     - name: Pull container dotnet/sdk:${{ matrix.dotnet }}
       run: |
@@ -94,7 +94,7 @@ jobs:
 
     - name: Find solutions
       shell: bash
-      run: echo "solutions=$(find ./dotnet -type f -name "*.sln" | tr '\n' ' ')" >> $GITHUB_ENV
+      run: echo "solutions=$(find ./dotnet -type f -name "*.slnx" | tr '\n' ' ')" >> $GITHUB_ENV
 
     - name: Restore dependencies
       shell: bash

.github/workflows/dotnet-format.yml

@@ -73,11 +73,11 @@ jobs:
               done
             done
           else
-            # if the changed-files step failed, run dotnet on the whole sln instead of specific projects
-            csproj_files=$(find ./ -type f -name "*.sln" | tr '\n' ' ');
+            # if the changed-files step failed, run dotnet on the whole slnx instead of specific projects
+            csproj_files=$(find ./ -type f -name "*.slnx" | tr '\n' ' ');
           fi
           csproj_files=($(printf "%s\n" "${csproj_files[@]}" | sort -u))
-          echo "Found ${#csproj_files[@]} unique csproj/sln files: ${csproj_files[*]}"
+          echo "Found ${#csproj_files[@]} unique csproj/slnx files: ${csproj_files[*]}"
           echo "::set-output name=csproj_files::${csproj_files[*]}"
 
       - name: Pull container dotnet/sdk:${{ matrix.dotnet }}

.gitignore

@@ -439,7 +439,6 @@ __pycache__/
 .mypy_cache/
 __pypackages__/
 .pdm.toml
-global.json
 
 # doxfx
 **/DROP/
@@ -499,4 +498,4 @@ swa-cli.config.json
 **/.kiota
 
 # dapr extension files
-**/dapr.yaml
+**/dapr.yaml

dotnet/Directory.Build.targets

@@ -3,10 +3,9 @@
   <!-- using Central Package Management feature -->
   <!-- https://learn.microsoft.com/en-us/nuget/consume-packages/Central-Package-Management -->
   <Sdk Name="Microsoft.Build.CentralPackageVersions" Version="2.1.3" />
-  <!-- Only run 'dotnet format' on dev machines, Release builds. Skip on GitHub Actions -->
-  <!-- as this runs in its own Actions job. -->
+  <!-- Only run 'dotnet format' on dev machines, Release builds. Skip on GitHub Actions and Azure DevOps. -->
   <Target Name="DotnetFormatOnBuild" BeforeTargets="Build"
-          Condition=" '$(Configuration)' == 'Release' AND '$(GITHUB_ACTIONS)' == '' ">
+          Condition=" '$(Configuration)' == 'Release' AND '$(GITHUB_ACTIONS)' == '' AND '$(TF_BUILD)' != 'true' ">
     <Message Text="Running dotnet format" Importance="high" />
     <Exec Command="dotnet format --no-restore -v diag $(ProjectFileName)" />
   </Target>

dotnet/MEVD.slnf

@@ -1,6 +1,6 @@
 {
   "solution": {
-    "path": "SK-dotnet.sln",
+    "path": "SK-dotnet.slnx",
     "projects":
     [
       "src/Connectors/Connectors.Memory.AzureAISearch/Connectors.Memory.AzureAISearch.csproj",