How to check if an object is not of a particular type?

Question

I want to check if an object is not of a particular type. I know how to check if something is of a particular type:

if (t is TypeA)
{
   ...
}
         


        

Answer 1

If you are doing a TypeA x = (TypeA)t; inside the if block then a better way is

TypeA x = t as TypeA
if(x != null)
{
...
}

This causes only one time type checking rather than twice.