C# exception filter?

Question

Does C# support compiling filters? How do filters even work or what do they do?

Like reflector decompiles a filter as

try
{
}
catch(Exception e) when (?)
{         


        

Answer 1

Exception filters support in C# is introduced in C# 6 (Visual Studio "Dev14"):

try
{
    throw new ApplicationException("1");
}
catch (ApplicationException ex) when (ex.Message == "2")
{
    // this one won't execute.
}
catch (ApplicationException ex) when (ex.Message == "1")
{
    // this one will execute
}