IS NOT operator in c#

Question

Hello,

Question from beginner, can't find "is not" operator in C#. For example I have code below which do not work, I need to check is err not from class ThreadAbortException.

    catch (Exception err)
    {

        if (err is not ThreadAbortException)
        {
          }
   }

Regards, Tomas

Answer 1

In this case, wrap and check the boolean opposite:

if (!(err is ThreadAbortException))

Answer 2

Just change the catch block to:

catch(ThreadAbortException ex)
{
}
catch(Exception ex)
{
}

so you can handle ThreadAbortExceptions and all others separately.

Answer 3

You should be able to do something like this:

catch (Exception err){
    if (!(err is ThreadAbortException)) {
    //Code
    }
}

Answer 4

More than likely what you ought to do in this circumstance is:

try
{
   // Do Something
}
catch (ThreadAbortException threadEx)
{
   // Do something specific
}
catch (Exception ex)
{
   // Do something more generic
}

You can have multiple catch blocks for a try. Always make sure to order them such that the most specific is on top, and the most generic (catch (Exception ex)) is last because the lookup order is from top to bottom, so if you put the catch (Exception ex) first, it will always be the only one to run.

Answer 5

Lee has the best answer,

just to add you should always catch from the most specific down to the most general, in you case the ThreadAbortException is the most specific so deal with that first.

Answer 6

Perhaps you are looking for this:

if(err.GetType() != typeof(ThreadAbortException))
{

}

But I will strogly recommend using separate catch statement as suggested by Lee

catch(ThreadAbortException ex) 
{ 
} 
catch(Exception ex) 
{ 
}