问题
I have a series of extension methods defined for various classes in a C# library. I'm currently writing some F# code and instead of rewriting that code I would simply like to use my existing extension methods in my F# code.
I have added a reference to the library and used the open statement to import the namespace, but the extension methods to not appear in F#
回答1:
Update:
In the current version of F#, you can simply consume extension methods by adding
open TheNamespaceOfExtensionMethod
to your source file (just like you do in C# with a using directive) and simply call the extension method as if it was a normal instance method.
By the way, you can always call them directly just like a normal static method and pass the object reference as the first parameter without any directives if you want. An extension method is simply a static method decorated with ExtensionAttribute under the hood.
Original answer (before F# 2010 beta; not true anymore, as Dykam points out):
I don't think extension methods are supported by F#. You can always call them directly just like a normal static method and pass the object reference as the first parameter.
回答2:
Being able to 'import' C#/VB extension methods will be supported in the next release of F#.
See also
F# extension methods in C#
for more detail on the topic.
来源：https://stackoverflow.com/questions/777247/using-extension-methods-defined-in-c-sharp-from-f-code