The Ultimate Disposable
I'm very partial to safe code, so I really like the using() statement in C#. The problem with this statement, however, is that I want to do different things at different times, which require different disposing semantics from the same class. Here is an example from Rhino Mocks:
using(mocks.Ordered())
{
using(mocks.Unordered())
{
}
}
I'm using the using() statement to allow easy scoping of the behavior. I find the code far more readable this way. The problem is that I need to create a class that implements IDisposable, while the action that I want is a single line of code. For this purpose, I created the DisposableAction:
public class DisposableAction : IDisposable
{
Action<T> _action;
public DisposableAction(Action<T> action, T val)
{
if (action == null)
throw new ArgumentNullException("action");
_action = action;
}
public void Dispose()
{
_action();
}
}
The usage of this class is simple:
public IDisposable AllowModification
{
get
{
_allowModification = true;
return new DisposableAction(delegate { _allowModification = false; } );
}
}
And then you can call it like this:
UsuallyReadOnly foo = new UsuallyReadOnly();
using(foo.AllowModification)
{
foo.Name = "Bar";
}
Simple, safe, and it doesn't require of me to write any more than neccecary.