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.

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.

Possible null reference return.

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

Member 'SlowMethod2' 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)

Dereference of a possibly null reference.

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