Question

Imagine I have a picture viewer application made with C# and .NET. I have already set the preferred application to view pictures to use the C# application.

I want to somehow let my program know where it has been invoked. How can I achieve this?

Answer 1

If you’re using it to view pictures via shell associations, you can just check the picture filenames passed in on the command line. You can use Environment.GetCommandLineArgs to get the first filename:

  // Should check to make sure there is at least one filename passed first...
  string imageFilename = Environment.GetCommandLineArgs[1];
  string directory = System.IO.Path.GetDirectoryName(imageFilename);

If you want the working directory, just check Environment.CurrentDirectory at startup…