How Can I Efficiently Catch Multiple Exceptions in C#?

Catch multiple exceptions at the same time

When handling multiple known exceptions in C# code, it can be tedious to catch and handle each exception individually. For example, in the provided scenario:

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

To simplify this process, consider using a single catch block that contains all potential exceptions and use a switch statement to differentiate between them:

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

In this case, any FormatException or OverflowException thrown will be handled by setting the WebId to Guid.Empty, while all other exceptions will be allowed to propagate. This approach simplifies the code while maintaining control over handling expected exceptions.

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