Type 'MainWindow' already defines a member called 'AddToSubtitle' with the same parameter types

Type 'MainWindow' already defines a member called 'ClearSubtitle' with the same parameter types

Type 'MainWindow' already defines a member called 'AddToSubtitle' with the same parameter types

Type 'MainWindow' already defines a member called 'ClearSubtitle' with the same parameter types

Process completed with exit code 1.

Possible null reference return.

Non-nullable property 'InterfaceType' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'ProjectedClassType' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'Clsids' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Avoid multiple blank lines (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide2000)

Remove unused parameter 'extension' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0060)

Member 'SlowMethod2' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)

Member 'SlowMethod3' does not access instance data and can be marked as static (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822)

Type 'TestClass' can be sealed because it has no subtypes in its containing assembly and is not externally visible (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1852)