Question

Is it possible to tell the difference between the normal exit of a using block and an exit that is due to an exception being thrown? Using try/catch/finally I can write:

Foo f = new Foo();
try 
{
    f.stuff();
} 
catch() 
{
    f.ThereWasAnError();
} 
finally 
{
    f.Dispose();
}

but it would be nice if the users of my class didn’t need to care about this, and could write

using (var f = new Foo()) { ... }

I can’t see a way to tell in the Dispose method why I’m being called. Is it possible?

Answer 1

I do not recommend the following. As Eric Lippert writes, this is an abuse of the disposable-pattern.

That being said, the following should work:

public void Dispose(){
    if(Marshal.GetExceptionCode()==0){
        // disposing normally
        Commit();
    }else{
        // disposing because of exception.
        Rollback();
    }
}