Using extension methods in .NET 2.0?

Question

I want to do this, but getting this error:

Error 1 Cannot define a new extension method because the compiler required type \'System.Runtime.Compiler

Answer 1

Like so:

// you need this once (only), and it must be in this namespace
namespace System.Runtime.CompilerServices
{
    [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class
         | AttributeTargets.Method)]
    public sealed class ExtensionAttribute : Attribute {}
}
// you can have as many of these as you like, in any namespaces
public static class MyExtensionMethods {
    public static int MeasureDisplayStringWidth (
            this Graphics graphics, string text )
    {
           /* ... */
    }
}

Alternatively; just add a reference to LINQBridge.