Create a custom exception using C#

Question

I am trying to override the System.Exception class with my own exception class. I would like to add the parameter "code".

I would want to do this:

throw new MyException(code, "message");

Then catch the exception using something like this:

catch (MyException e) {
    Console.WriteLine(e.code)
}

Update: The problem was that I needed to catch the exception as "(MyException e)" instead of "(Exception e)"

This is my code so far:

public class MyException : System.Exception
{
    public String ErrorCode = "";

    public MyException() : base()
    {
    }

    public MyException(string message, string code) : base(message)
    {
        this.ErrorCode = code;
    }
    public MyException(string message, Exception inner, string code) : base(message, inner)
    {
        this.ErrorCode = code;
    }
}

This gives me an error that "System.Exception does not contain a definition for 'ErrorCode'...". What am I doing wrong?

My guess is that you accidentally have catch (Exception e) instead of catch (MyException e) — Rob Levine
– Rob Levine, Commented Mar 13, 2012 at 11:52
Tom: pinpoint the line and make sure you post the exact code that produces the error. — Henk Holterman
– Henk Holterman, Commented Mar 13, 2012 at 11:55

Humn · Accepted Answer · 2012-03-13 11:59:18Z

2

I have test your code,the exception class is right,but the catch is wrong.My test code is this.

        catch (MyException ex)
        {
            Console.WriteLine(ex.ErrorCode);
        }

answered Mar 13, 2012 at 11:59

Humn

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1 Comment

Tom Over a year ago

Thanks, indeed I was trying to catch the error as a "exception" instead of "MyException"

shahkalpesh · Accepted Answer · 2012-03-13 11:52:37Z

0

That is because it is ErrorCode and not Code.
Also, make that a public readonly property.

EDIT:

catch (MyException e) {
    Console.WriteLine(e.ErrorCode)
}

answered Mar 13, 2012 at 11:52

shahkalpesh

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5 Comments

svick Over a year ago

The error message states that it's ErrorCode that's missing.

shahkalpesh Over a year ago

@svick: Please take a look at the accepted answer. When downvoting, please help me understand the reason. Thanks.

svick Over a year ago

I think your answer doesn't actually answer the question, because that's not what the problem was. Of course, correctly answering questions like this requires a crystal ball, which is why I did not downvote your answer.

shahkalpesh Over a year ago

@svick: Thanks for not downvoting. What do you think the problem was other than wrong code pasted by OP? If the question is wrong, it should be deleted. Isn't it?

svick Over a year ago

The problem was catching Exception instead of MyException, the OP says that in the update to the question. I think you're right that this question should be deleted, which is why I already voted to close it.

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