AttributeUsage 2

using System;
using System.Collections.Generic;
using System.Text;


namespace Madpet.Network.ProtoBuff
{
enum ProtoBufDataType
{
INT = 0,
STRING,
}


[AttributeUsage(AttributeTargets.Field)]
class ProtoBuffFieldAttribute : System.Attribute
{
public int mId;
public ProtoBufDataType mFieldType;
public ProtoBuffFieldAttribute(int id, ProtoBufDataType field_type)
{
mId = id;
mFieldType = field_type;
}
}

}

using System;


namespace Madpet.Network.ProtoBuff
{
public class LoginRequest
{
[ProtoBuffFieldAttribute(1, ProtoBufDataType.STRING)]
public string userName;


[ProtoBuffFieldAttribute(2, ProtoBufDataType.STRING)]
public string passWordMd5;


}
}