Question

Let us assume that a particular Exception ‘SomeException‘ is part of the exception stack,

so let us assume ex.InnerException.InnerException.InnerException is of type ‘SomeException‘

Is there any built-in API in C# which will try to locate a given exception type in exception stack?

Example:

SomeException someExp = exp.LocateExceptionInStack(typeof(SomeException)); 

Answer 1

No, I don’t believe there’s any built in way of doing it. It’s not hard to write though:

public static T LocateException<T>(Exception outer) where T : Exception {     while (outer != null)     {         T candidate = outer as T;         if (candidate != null)         {             return candidate;         }         outer = outer.InnerException;     }     return null; } 

If you’re using C# 3 you could make it an extension method (just make the parameter ‘this Exception outer’) and it would be even nicer to use:

SomeException nested = originalException.Locate<SomeException>(); 

(Note the shortening of the name as well – adjust to your own taste 🙂