How to do it...

1. In Solution Explorer, double-click on Resources.resx file in CSharpAnalyzers project to open the resource file in the resource editor.
2. Replace the existing resource strings for AnalyzerDescription, AnalyzerMessageFormat and AnalyzerTitle with new strings.

1. Replace the Initialize method implementation with the code from CSharpAnalyzers/CSharpAnalyzers/CSharpAnalyzers/DiagnosticAnalyzer.cs/ method named Initialize.
2. Add private class UnusedParametersAnalyzer from CSharpAnalyzers/CSharpAnalyzers/CSharpAnalyzers/DiagnosticAnalyzer.cs/ type named UnusedParametersAnalyzer in your analyzer to perform the core method body analysis for a given method.
3. Click on Ctrl + F5 to start a new Visual Studio instance with the analyzer enabled.

1. In the new Visual Studio instance, create a new C# class library with the following code:

namespace ClassLibrary
{
  public class Class1
  {
    void M(int param1, ref int param2, int param3, params int[] param4)
    {
      int local1 = param1;
      param2 = 0;
    }
  }
}

1. Verify the analyzer diagnostic is not reported for param1 and param2, but is reported for param3 and param4:

1. Now, add code to use param3 in the local declaration statement, delete param4, and verify the diagnostics go away: