CODEWITHSUNDEEP
f#c#-to-f#
Maslow
Maslow

Reputation: 18746

Can you define namespace-less extension methods compatible with C#?

I know you can define empty namespace extension methods in c#, can you define the same methods in F# for consumption by C#? I followed this general post on getting C# compatible extension methods, but I'm not having any luck figuring out the final step for a 1-1 conversion.

this is not a duplicate, I'm looking for the way to define extension methods that are in the global namespace as far as C# is concerned, not how to define regular extension methods in F# that C# can see.

Upvotes: 1

Views: 114

Answers (1)

Gene Belitski
Gene Belitski

Reputation: 10350

You definitely can create such extension methods in F#. This may be achieved via Global Namespace exploiting the feature that an F# module declared outside of any namespace gets into this default global namespace as in the snippets below:

// Tested under Visual Studio 2013 Premium/F# 3.1:

// F# library module
[<System.Runtime.CompilerServices.Extension>]
module Extension
    [<System.Runtime.CompilerServices.Extension>]
    let Superb(s: System.String) = "Superb!!!"

and

// Use extension method on System.String from C# console app:
class Test
{
    static void Main(string[] args)
    {
        System.Console.WriteLine("abc".Superb());
    }
}

Upvotes: 2

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