如何在C＃中使用字节常量作为切换条件？

Question

I'm developing a network protocol that needs to be as low-bandwidth as possible. I've decided therefore that instead of using a header that is a string for each message type, such as "connect" , "move" or "disconnect" , it would be better to use a byte .

Here's a snippet of what I have so far:

// Message types
public static readonly byte CONNECT = 100;
public static readonly byte MOVE = 101;
public static readonly byte DISCONNECT = 102;

Now elsewhere I have:

switch (in_message.ReadByte())
{
    case CONNECT: Connect(); break;
    case MOVE: Move(); break;
    case DISCONNECT: Disconnect(); break;
}
Client.Recycle(in_message);

Visual Studio doesn't seem to like the fact that I'm using byte constants, the specific error message is A constant value is expected .

Is there any way I can get these byte constants to work with the switch statement?

Answer 1

What you have are read-only fields, which aren't considered constant values (they can be assigned to by a static constructor). Use constants instead:

public  byte CONNECT = 100;