The type caught or thrown must be derived from System.Exception

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Hi

I am using Exception Handling. while using the below code . it shows the error msg as below

C#

try
{

}
catch(Exception ex)
{
   throw ex;
}

Error msg is :

The type caught or thrown must be derived from System.Exception

please help me to solve this problem.

Thanks in Advance
Mohan

Posted 11-Sep-12 17:54pm

V Mohan

Updated 11-Sep-12 17:57pm

JF2015

v2

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Comments

Ashraff Ali Wahab 11-Sep-12 23:58pm

Why a empty try block gives you exception.Please look at your question and supply the correct code.

Rickin Kane 12-Sep-12 0:03am

can you paste the code you are doing in try { }

ledtech3 12-Sep-12 0:24am

It looks like you are trying to throw and catch the same exception.
I normaly Code this way in VB.

Try

Catch ex As Exception
MsgBox(ex.Message)
End Try
Here is a converted version from VB to C#
try {
} catch (Exception ex) {
Interaction.MsgBox(ex.Message);
}

3 solutions

Solution 1

It seems like you have a custom exception handling, if so:

C#

try
{

}
catch(Exception ex)
{
   throw new System.Exception(ex.ToString()); // you may change to ex.Message if you have a property Message on your custom exception.
}

Posted 11-Sep-12 18:41pm

Kuthuparakkal

Solution 2

hi.... try using below code:

C#

try
{

}
catch(System.Exception ex)
{
   throw ex;
}

Posted 11-Sep-12 18:48pm

Gautam Raithatha

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Rajasekaran Patchimuthu · Accepted Answer · 2012-09-11T18:53:00

Hi Mohan,

The Error message displayed is fairly straight forward. This error would happen possibly when there are ambiguous declaration of "Exception" class. I would suggest you to use the complete namespace(prefix the Exception with System) in the catch block as below.

Solution:

C#

try
{

}
catch (System.Exception ex)
{
    throw ex;
}

Use the below script to reproduce the error scenario:

C#

using System;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            try
            {

            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
    }

    public class Exception
    {

    }
}