How Can I Efficiently Handle Multiple Specific Exceptions in C#?

Easily handle multiple exceptions

Conventional practice in exception handling generally recommends avoiding catching generic System.Exception errors. Instead, it is recommended to only handle specific exceptions that are "known" to the application. However, this approach sometimes leads to code duplication.

Consider the following scenario:

<code class="language-csharp">try
{
    WebId = new Guid(queryString["web"]);
}
catch (FormatException)
{
    WebId = Guid.Empty;
}
catch (OverflowException)
{
    WebId = Guid.Empty;
}</code>

To avoid this duplication, a more elegant solution is to catch both exceptions with a single catch block:

<code class="language-csharp">catch (Exception ex)            
{                
    if (ex is FormatException || ex is OverflowException)
    {
        WebId = Guid.Empty;
    }
    else
        throw;
}</code>

This code uses if statements to identify specific exceptions that need to be handled. The advantage of this approach is that multiple exceptions can be caught at once while still allowing unexpected exceptions to propagate up the stack. This is especially useful when an object is modified multiple times and needs to be reset if one of the operations fails.

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