Catch multiple exceptions at once?

It is discouraged to simply catch System.Exception. Instead, only the “known” exceptions should be caught.

Now, this sometimes leads to unnecessary repetitive code, for example:

try
{
    WebId = new Guid(queryString["web"]);
}
catch (FormatException)
{
    WebId = Guid.Empty;
}
catch (OverflowException)
{
    WebId = Guid.Empty;
}

I wonder: Is there a way to catch both exceptions and only call the WebId = Guid.Empty call once?

The given example is rather simple, as it’s only a GUID. But imagine code where you modify an object multiple times, and if one of the manipulations fails expectedly, you want to “reset” the object. However, if there is an unexpected exception, I still want to throw that higher.

Answer

Catch System.Exception and switch on the types

catch (Exception ex)            
{                
    if (ex is FormatException || ex is OverflowException)
    {
        WebId = Guid.Empty;
        return;
    }

    throw;
}

Leave a Reply

Your email address will not be published. Required fields are marked *