C# equivalent to VB.NET's Catch...When

Question

In VB.NET I often Catch…When:

Try
    …
Catch e As ArgumentNullException When e.ParamName.ToUpper() = "SAMPLES"
    …
End Try

Is there a C# equivalent to Catch…When?

I don't want to resort to using an if statement inside a catch if possible.

Answer 1

There's no equivalent to Catch…When in C#. You will really have to resort to an if statement inside your catch, then rethrow if your condition isn't fulfilled:

try
{
    …
}
catch (ArgumentNullException e)
{
    if ("SAMPLES" == e.ParamName.ToUpper())
    {
        … // handle exception
    }
    else
    {
        throw;  // condition not fulfilled, let someone else handle the exception
    } 
}

Answer 2

This functionality was announced for C# 6. It is now possible to write

try { … }
catch (MyException e) when (myfilter(e))
{
    …
}

You can download the preview of Visual Studio 2015 now to check this out, or wait for the official release.