A question came up on an internal email list. 

 

You will get this error in the following code, as per the rules of C#:

 

try

{

....

}

catch(Exception e)

{

// Handle cleanup.

throw;

}

 

With the exception of disabling this specific warning, is there anyway to have the Exception variable in a catch that is not using it (so that debugging is easier) and not hit this warning?

 

Can the warning be disabled only for catch()? (Yeah, I am guessing it can't too, worth asking. :))

 

The goal is to make it easy to set a breakpoint here & see the details of the exception, without interfering with the behavior of the program.  ‘throw e’ is different from ‘throw’ here.

 

One proposal was to throw a new exception, with ‘e’ as the inner exception.  The proposal relied too much on strings for my taste, so I put this together:

 

    using System;

    using System.Runtime.Serialization;

 

    [Serializable]

    public class RethrownException : ApplicationException

    {

        public static void Throw(Exception exception)

        {

            throw new RethrownException(exception);

        }

 

        public RethrownException(Exception inner) : base(null, inner) { }

 

        public RethrownException(SerializationInfo info, StreamingContext context) : base(info, context) { }

    }

 

And here’s the usage:

 

            try

            {

                throw new System.Exception("sdfs");

            }

            catch (System.Exception ex)

            {

                RethrownException.Throw(ex);

            }

 

 

What do you think?