C# enums - Possible to have double ids

Question

I just noticed that you can create something like this in C#:

enum TestEnum
{
  First = 1,
  Second = 1,
  Third = 2
}

[TestMethod]
public void Test()
{
  TestEnum test = TestEnum.First;
  var en = (TestEnum) 1;//And en is now set to First
}

We would like the enums value to be unique. Right now, I have written a unit test that checks that each value is only used once in our enum. Is there a better way to force the uniqueness?

Answer 1

枚举用于赋予整数含义。当你说 Second = 1 没有意义时，想想这样的例子：

enum HumanEnum
{
    Man = 1,
    Woman = 0,
    Lady = 0,
    Boy = 1,
    Girl = 0
}

假设 0 和 1 代表性别，这样 Man 和 Boy 具有相同的性别值。