How to define an extension method in a scriptcs csx script

Question

I\'m playing with ScriptCS (which is awesome!) but I couldn\'t figure out how to define an extension method within a .csx script file.

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Answer 1

I feel your pain.

Actually this is a limitation of Roslyn currently as it wraps everything into a class even if it is another class.

I've talked to the Roslyn team however and they are going to support extension methods soon.

Answer 2

Unfortunately, because compiling something on the fly requires a class, scriptcs was designed to take the raw code that mattered and wrap it in a class. You would need to modify a version of scriptcs for your needs -or consider contributing to the project.

However, I too love scriptcs and think it's one of the most fantastic projects out there today!

I too tried this early on when using scriptcs and my heart broke when it didn't work. If I had more bandwidth I'd contribute this addition on my own.

AFAIK this is not a limitation with Roslyn.

Answer 3

Good news! It is now supported in C# script files (.csx)

But you have to declare an extension method on top level:

static string MyToLowerExtension(this string str)
{
    return str.ToLower();
}

Do not declare it in a static class:

// this will not work!
public static class MyExtensionsClass
{
    static string MyToLowerExtension(this string str)
    {
        return str.ToLower();
    }
}