无法在IronPython中使用自定义扩展方法

Question

I have some extension methods I defined in my C# class, which I can import just fine into an IronPython script. However, when I attempt to call one of these methods (the "Find" method):

cmd.SetSpending(galaxy.Mod.Technologies.Find("Propulsion"), 100);

I get an error: "expected Predicate[Technology], found str".

I don't understand what's wrong - the extension method takes as its first parameter (the "this" parameter) an IEnumerable, which is what galaxy.Mod.Technologies is, and as its second a string, which is what I'm passing in. I'm importing it like so:

import FrEee;
import FrEee.Utility;
clr.ImportExtensions(FrEee.Utility.Extensions);

where FrEee.Utility.Extensions is a namespace containing CommonExtensions.cs, in which the Find method is defined.

I can call the "stock" System.Linq extension methods such as Single just fine:

techs = galaxy.Mod.Technologies;
tech = techs.Single(lambda t: t.Name == "Propulsion");

This accomplishes the exact same thing as my Find method, but I really would like to be able to use custom extension methods. Are they simply not supported in IronPython, or are only extension methods that take a Predicate supported for some reason?

Answer 1

It seems you have a name conflict. .Net has it's own .Find() extension method defined. Rename yours to something else (like FindName()) and it should work.