ansaurus

Question

Answer 1

+10 A:

Referencing an assembly containing a class with extension methods is not enough. You need to import the namespace containing the class in each of your source file where you want to use the extension methods.

For example, to use LINQ-to-objects, you need to reference the System.Core assembly and import the System.Linq namespace (which contains the Enumerable class with the LINQ extension methods):

using System.Linq;

dtb 2010-04-07 16:46:22

I have Using statements in my class files that reference the library and my project already references it. Not sure what else to do.

ChiliYago 2010-04-07 16:56:31

Are your extension method and the class containing the method public? Have you double-checked that you didn't forget `this` in the method signature? Does it work if you don't use extension method syntax to call the method?

dtb 2010-04-07 17:01:30

You need to find out what namespace the extension class you want is implemented in, and use that namespace in the C# code where you want the extensions available. You have to be very specific.

dthorpe 2010-04-07 17:02:03

yes i can see the extension method when NOT using the extension method syntax. The namespace containing the extension method is the same as all other methods in my library. The class and extension method is marked as "public static" and yes "this" is included in the method signature.

ChiliYago 2010-04-07 17:27:03

Can you post a short but complete program that demonstrates the problem?

dtb 2010-04-07 17:28:07

This there was some type of Visual Studio referencing problem between projects. Deleted and restored references and it cleared up...

ChiliYago 2010-04-07 18:50:27

Answer 2

+1 A:

Are you sure the extension method is made public?

Arjan Einbu 2010-04-07 16:48:25

yes the class is marked public static as it the extension method.

ChiliYago 2010-04-07 16:58:10

ansaurus

tags:

views:

answers:

Extension Methods not Recognized

related questions