Getting warning like C# files cannot be analyzed in the GitHub pipeline

I’m facing a below issue during the scanning of projects using GitHub sonar actions. Please refer the screenshot and implementation steps for reference.

My project is developed in .NET. Below is my Sample workflow.

Workflow implementation

name: Build, Test and Upload
on:
  push:
    branches: [feature]
jobs:
  build:
    strategy:
      matrix:
        configuration: [Release]        
    runs-on: [windows-latest]   
    env:
      Project_Path: .\SSN\DotNet\SSNLookup
      Solution_Name: .\SSN\DotNet\SSNLookup\SSNLookup.sln
      Test_Project_Path: .\SSN\DotNet\SSNLookup\SSNLookupTest      
    steps:
      - name: Checkout
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      # Add  MSBuild to the PATH: https://github.com/microsoft/setup-msbuild
      - name: Setup MSBuild.exe
        uses: microsoft/setup-msbuild@v1

      - name: Setup NuGet
        uses: nuget/setup-nuget@v1

      - name: Setup VSTest
        uses: darenm/Setup-VSTest@v1

      - name: Restore Packages
        run: nuget restore $env:Solution_Name

        # Restore the application to populate the obj folder with RuntimeIdentifiers
      - name: Restore the application
        run: |
          msbuild.exe $env:Solution_Name /p:platform="Any CPU" /p:Configuration=$env:Configuration
        env:
          Configuration: ${{ matrix.configuration }}

      - name: Run Tests
        run: vstest.console.exe $env:Test_Project_Path\bin\Release\SSNLookupTest.dll
        
      - name: Run OpenCover for code coverage report generation
        run: 
          Start-Process "$env:Project_Path\packages\opencover.4.7.1221\tools\OpenCover.Console.exe" -wait -NoNewWindow -ArgumentList "-target:""vstest.console.exe"" -targetargs:""$env:Test_Project_Path\bin\Release\SSNLookupTest.dll"" -output:""$env:Project_Path\coverage.xml"" -mergebyhash -register:path32 -returntargetcode"
       
      - name: Run nunit for test report generation
        run: 
          Start-Process "$env:Project_Path\packages\Nunit.ConsoleRunner.3.16.3\tools\nunit3-console.exe" -wait -NoNewWindow -ArgumentList @("--result=$env:Project_Path\TestResult.xml", "$env:Test_Project_Path\bin\Release\SSNLookupTest.dll")
      
      - name: Generate Test Coverage Report
        run:          
          Start-Process "$env:Project_Path\packages\ReportGenerator.5.1.22\tools\net47\ReportGenerator.exe" -wait -NoNewWindow -ArgumentList "-reports:""$env:Project_Path\coverage.xml"" -targetdir:""$env:Project_Path\Report"" -sourcedirs:""$env:Project_Path"""
      
      - name: Zip Project folder
        run: |
          tar -cvf Project.tar D:\a\SSN-Dbkey-Lookup\SSN-Dbkey-Lookup
            
      - name: Upload Project folder
        uses: actions/upload-artifact@v3
        with:
          name: Project.tar
          path: .\Project.tar
          retention-days: 1
        
  SonarQube:
    name: Sonar Scan
    needs:  [build]
    runs-on: [ self-hosted, kubernetes, on-prem ]
    # NOTE: Using SonarQube in actions has issues with the push event.
    continue-on-error: true
    steps:

      - name: Download Binaries
        uses: actions/download-artifact@v3
        with:
          name: Project.tar

      - name: Unzip Files
        run: |
          tar xvf /runner/_work/SSN-Dbkey-Lookup/SSN-Dbkey-Lookup/Project.tar
          
      - name: Check files
        run: |
          find a/SSN-Dbkey-Lookup/SSN-Dbkey-Lookup/sonar-project.properties -type f         
      - name: Read file content
        run: 
            cat a/SSN-Dbkey-Lookup/SSN-Dbkey-Lookup/sonar-project.properties

      - name: SonarQube Scan
        uses: sonarsource/sonarqube-scan-action@v1.2.0
        with:
          args: >
            -Dsonar.cs.opencover.reportsPaths=**/coverage.xml
        env:
          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
          SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
        

      - name: SonarQube Quality Gate check
        uses: sonarsource/sonarqube-quality-gate-action@v1.0.0
        with:
          scanMetadataReportFile: ./.scannerwork/report-task.txt
        timeout-minutes: 5
        env:
          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
          SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}

sonar-project.properties. It is created in the root directory

sonar.projectKey=SSN-Dbkey-Lookup
sonar.projectName=SSN-Dbkey-Lookup
sonar.sources=.
sonar.language=cs
sonar.souceEncoding=UTF-8
sonar.cs.opencover.reportsPaths=**/coverage.xml
sonar.cs.nunit.reportsPaths=**/TestResult.xml
sonar.exclusions=*/qa_automation_test

Hey there.

You can’t use sonarqube-scan-action to scan C# projects. Take a look at this documentation about how to scan C# projects.