C# Exception InnerException

Description

Exception InnerException gets the Exception instance that caused the current exception.

Syntax

Exception.InnerException has the following syntax.


public Exception InnerException { get; }

Example

The following example demonstrates throwing and catching an exception that references an inner exception.


//from www  .j av  a2  s .  c  om
using System;
public class MyAppException:ApplicationException 
{
   public MyAppException (String message) : base (message) 
   {}
   public MyAppException (String message, Exception inner) : base(message,inner) {}  
   }
public class ExceptExample 
{
   public void ThrowInner () 
   {
   throw new MyAppException("ExceptExample inner exception");
   }
   public void CatchInner() 
   {
      try 
      {
      this.ThrowInner();
      }catch (Exception e) {
         throw new MyAppException("Error caused by trying ThrowInner.",e);
      }
   }
}
public class Test 
{
   public static void Main() 
   {
       ExceptExample testInstance = new ExceptExample();
      try 
      {
      testInstance.CatchInner();
      }
         catch(Exception e) 
         {
         Console.WriteLine ("In Main catch block. Caught: {0}", e.Message);
         Console.WriteLine ("Inner Exception is {0}",e.InnerException);
         }
   }
}

The code above generates the following result.