How to detect that C# Windows Forms code is executed within Visual Studio?

Question

Is there a variable or a preprocessor constant that allows to know that the code is executed within the context of Visual Studio?

Answer 1

I think the simplest and most reliable way to determine if your extension is executed in the WinForms designer is to check the current process.

public static bool InVisualStudio() {
  return StringComparer.OrdinalIgnoreCase.Equals(
    "devenv", 
    Process.CurrentProcess.ProcessName);
}