Needed: File system interfaces and implementation in .NET [duplicate]

Answer 1

I've written adapters for the static System.IO.File and Directory methods. Then in my classes I do the following:

public class MyService {
  public IFile File {private get;set;}
  public MyService() {
    File = new FileImpl();
  }
  public void DoSomething() {
    File.ReadAllText("somefile");
  }
}

Then you can inject a mock as IFile for testing.