Will the dynamic keyword in C#4 support extension methods?

c# dynamic extension-methods c#-4.0
Motti picture Motti · Nov 3, 2008 · Viewed 9.3k times · Source

I'm listening to a talk about C#4's dynamic keyword and I'm wondering... Will this feature be orthogonal to other .NET features, for example will it support extension methods?

public static class StrExtension {
    public static string twice(this string str) { return str + str; }
}
...
dynamic x = "Yo";
x.twice(); // will this work?

Note: This question was asked before C#4 was shipped which is why it's phrased in the future tense.

Answer

Jon Skeet picture Jon Skeet · Nov 3, 2008

From the "New Features in C# 4" word doc:

Dynamic lookup will not be able to find extension methods. Whether extension methods apply or not depends on the static context of the call (i.e. which using clauses occur), and this context information is not currently kept as part of the payload.

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