Is it possible to force the use of “using” for disposable classes?

Question

I need to force the use of \"using\" to dispose a new instance of a class.

public class MyClass : IDisposable
{
   ...
}

using(MyClass obj = new MyClass())          


        

Answer 1

It's ugly, but you could do something like this:

    public sealed class DisposableClass : IDisposable
    {
        private DisposableClass()
        {

        }

        public void Dispose()
        {
            //Dispose...
        }

        public static void DoSomething(Action<DisposableClass> doSomething)
        {
            using (var disposable = new DisposableClass())
            {
                doSomething(disposable);
            }
        }
    }

Answer 2

No, you cannot do that. You can't even force them to call dispose. The best you can do is add a finalizer. Just keep in mind that the finalizer will get called when the object is disposed and that is up to the runtime.

Answer 3

I wonder if FXCop could enforce that rule?

Answer 4

The using statement is a shorthand that the compiler converts from:

(using DisposableObject d = new DisposableObject()){}

into:

DisposableObject d = new DisposableObject()
try
{

}
finally
{
    if(d != null) d.Dispose();
}

so you are more or less asking if it is possible to enforce writing a try/finally block that calls Dispose for an object.