C # - How can I wrap a static class

Question

I want to make usage classes for System.Io (e.g. File, Directory, etc.).

Since inheritance cannot be done for static classes, I want to know how there will be a suitable way to wrap, say System.Io.File.

Answer 1

I would create three types:

• An interface containing all the methods you want to test, etc., for example

  public interface IFileSystem { Stream OpenWrite(string filename); TextReader OpenText(string filename); // etc } 

• The implementation that delegates the implementation of the system:

   public class FrameworkFileSystem : IFileSystem { public Stream OpenWrite(string filename) { return File.OpenWrite(filename); } // etc } 

• Fake implementation for testing:

   public class FakeFileSystem : IFileSystem { // Probably all kinds of things to allow in-memory files // to be created etc } 

You may not want to insert everything from File there, because many of the operations can be made up of "core" ones. Of course, this will mean re-executing operations, which may be undesirable ...