Question

I am getting the error:

‘string[]’ does not contain a definition for ‘Cast’ and no extension method ‘Cast’ accepting a first argument of type ‘string[]’ could be found (are you missing a using directive or an assembly reference?)

on the following piece of code:

return mNames.Cast().ToArray();

What using directive or assembly reference do I need?
How do I find out such things?

I’m a noob at C# and .NET, I’m just copying code to get a job done, so don’t get too technical with me.

Answer 1

(1) Make sure you are working on C# 3.0+

(2) Make sure your code contains:

using System.Linq;

(3) .Cast is a generic method, you need to specify the type parameter, like this:

return mNames.Cast<AnotherType>().ToArray();