extension methods as static class methods

Question

Possible Duplicate:
Can you add extension methods that you call like static methods?

I would like to add NewSequentialGuid function on the Guid system type, so I can use like following:

Id = Guid.NewSequentialGuid()

namespace MyExtensions
{
    public static class GuidExtensions
    {
        [DllImport("rpcrt4.dll", SetLastError = true)]
        static extern int UuidCreateSequential(out Guid guid);

        public static Guid NewSequentialGuid(this Guid guid)
        {
            const int RPC_S_OK = 0;
            Guid g;
            int hr = UuidCreateSequential(out g);
            if (hr != RPC_S_OK)
                throw new ApplicationException
                  ("UuidCreateSequential failed: " + hr);
            return g;
        }
    }
}

But I cannot get this to work, it only works with instance variables, any idea how to add this to extended class as a static method?

You realize that this does *not* return guids that are in any way sequential, right? — Hans Passant, Dec 23 '10 at 14:25
My understanding is that, this creates sequential guids until the next restart of the server. — hazimdikenli, Dec 30 '10 at 12:13

score 4 · Accepted Answer · answered Dec 23 '10 at 12:43

You can't.

They were created to look like instance methods and can't be make to work as class (static) methods.

From MSDN:

Extension methods are a special kind of static method, but they are called as if they were instance methods on the extended type.

And:

Extension methods are defined as static methods but are called by using instance method syntax.

score 0 · Answer 2 · edited May 23 '17 at 12:11

0

Can you add extension methods that you call like static methods?

edited May 23 '17 at 12:11

Community

1
1

answered Dec 23 '10 at 12:44

Madhur Ahuja

22,211
14
71
124

3

Normally best to add this as a comment to the question, rather than an answer. It's a duplicate question. – Tim Lloyd Dec 23 '10 at 12:46

extension methods as static class methods

2 Answers2