Cannot choose method from group in Task.FromAsync method

Question

I have the following function

public static Task<int> SendTaskAsync(this Socket socket, byte[] buffer, int offset, int size, SocketFlags flags)
{
    AsyncCallback nullOp = (i) => { };
    IAsyncResult result = socket.BeginSend(buffer, offset, size, flags, nullOp, socket);
    // Use overload that takes an IAsyncResult directly
    return Task.Factory.FromAsync(result, socket.EndSend);
}

However I'm getting a

"Cannot choose method from group"

error on FromAsync. How should my code be? I'm pretty new to TAP

Answer 1

Change this:

 return Task.Factory.FromAsync(result, socket.EndSend);

into this:

 return  Task<int>.Factory.FromAsync(result, socket.EndSend);

Edit:

As @cremor says, you can alternatively use:

 return Task.Factory.FromAsync<int>(result, socket.EndSend);