将C＃Enum定义序列化为Json

Given the following in C#:

在C＃中给出以下内容：

[Flags]
public enum MyFlags {
  None = 0,
  First = 1 << 0,
  Second = 1 << 1,
  Third = 1 << 2,
  Fourth = 1 << 3
}  
[Fla