How do I catch inner exception before base exception ?

Question

0.00/5 (No votes)

See more:

Hi there . i write following code :

catch (SocketException se)
            {
                if (se.SocketErrorCode == SocketError.TimedOut)
                {
                    //my logic
                }
            }
            catch (WebException we)
            {

            }

and want to catch socket exception first(InnerException of WebException in my condition).
but it doesn't occur. how can do it without inner of WebException block?
thanks

What I have tried:

catch (SocketException se)
            {
                if (se.SocketErrorCode == SocketError.TimedOut)
                {
                    //my logic
                }
            }
            catch (WebException we)
            {

            }

Posted 8-Apr-17 20:14pm

aliwpf

Updated 11-Apr-17 9:54am

Add a Solution

2 solutions

Solution 1

Use Try ... Catch (Exception e) to catch all managed exceptions.
Or you could try to use an empty Try .. Catch, without anything after the Catch. This way you can catch unmanaged exceptions too.
When the code is unreachable for debugging, read this CodeProject article: System.Diagnostics Useful Actions[^]

Posted 8-Apr-17 21:27pm

RickZeeland

Updated 8-Apr-17 21:33pm

v2

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Accepted Answer · 2017-04-11T09:54:00

If you're using C# 6 (Visual Studio 2015 or later), you can use an exception filter:

C#

catch (WebException we) when (we.InnerException is SocketException)
{
    var se = (SocketException)we.InnerException;
    if (se.SocketErrorCode == SocketError.TimedOut)
    {
        ...
    }
}
catch (WebException we)
{
    ...
}

If you're using C# 7 (Visual Studio 2017), you can simplify that by combining an exception filter with pattern matching:

C#

catch (WebException we) when (we.InnerException is SocketException se)
{
    if (se.SocketErrorCode == SocketError.TimedOut)
    {
        ...
    }
}
catch (WebException we)
{
    ...
}

Or even:

C#

catch (WebException we) when (we.InnerException is SocketException se && se.SocketErrorCode == SocketError.TimedOut)
{
    ...
}
catch (WebException we)
{
    ...
}

In earlier versions, C# didn't support exception filters. You'll have no choice but to catch the outer exception and test the inner exception:

C#

catch (WebException we)
{
    var se = we.InnerException as SocketException;
    if (se != null)
    {
        if (se.SocketErrorCode == SocketError.TimedOut)
        {
            ...
        }
    }
    else
    {
        ...
    }
}