C#: Overriding ToString() method for custom exceptions

Question

I have a custom exception class which contains some additional fields. I want these to be written out in the ToString() method, but if I implement my own ToString(), I loose some other useful stuff (like writing the exception type name, the inner exception data and the stack trace).

What is the best way/pattern to implement your own ToString() method for such exceptions? Ideally it should reuse the existing mechanism, but be formatted in way similar to the default ToString() implementation.

UPDATE: prepending or appending my custom fields to the base.ToString() text isn't ideal IMHO, for example

PimTool.Utilities.OERestServiceUnavailableException: test ---> System.InvalidOperationException: inner message
   --- End of inner exception stack trace ---
   at PimTool.Tests.Services.OE.OERestClientTests.ExceptionsLogging() in D:\svn\NewPimTool\PimTool.Tests\Services\OE\OERestClientTests.cs:line 178, 
   StatusCode=0, message='test', requestId='535345'

means the custom fields are written at the end of the (potentially long) exception description. On the other hand, I want the exception type to be the first information written in the description.

UPDATE 2: I've implemented a solution for this, look for my own answer below.

Answer 1

This is all overkill. Your exception should just override the Message Property.

public override String Message {
    get {  
        return base.Message + String.Format(", HttpStatusCode={0}, RequestId='{1}'", 
                    httpStatusCode, 
                    RequestId);
    }
}

The default ToString method for the Exception class is basically "ClassName: Message --> InnerException.ToString() StackTrace". So overriding the Message puts your message text exactly where it should be.