Rethrow in finally not allowed

[AnakinRaW]

Hey, while reading through the ECMA-335 i noticed that finally clauses are allowed to rethrow when within a try-catch block.

However when trying to create such a code in C# i get an compiler error CS0724 which explicitly forbids this situation. I'd like to know what was the reason not enabling this in C#

Cheers

public void M() { 
        try{
        } catch {
          try{
          } finally{
              throw; // CS0724 here
          }   
        }        
    }

[canton7]

What if the try block doesn't throw an exception? What exception should that finally block throw?

[HaloFour]

I think the intent is to throw the exception caught by the catch clause of the outer try block. I'd suggest it's not allowed because it would be obnoxious to change the syntax to be context dependent in that case and that the workaround using flags is sufficient given how uncommon it would be to want this.

[canton7]

Ah, yes you're right.

Note that ExceptionDispatchInfo exists these days, which gives you a way to re-throw any exception from any place without losing the stack trace, without needing to use throw; from within a catch block specifically.