Question

我很想知道,为什么我获得这一产出:

enum MyEnum
{
    a=1,
    b=2,
    c=3,
    d=3,
    f=d
}
Console.WriteLine(MyEnum.f.ToString());

OUTPUT
c

But in Mono
OUTPUT
f

<><>>>> 因此,产出为何如此? 否汇编者如何选择? 如果我这样改动:。

enum MyEnum
{
    a=1,
    b=2,
    c=3,
    d=3, 
    k=3
}
Console.WriteLine(MyEnum.k.ToString());

OUTPUT
c
again!

Another example:

enum MyEnum
{
    a=3,
    b=3,
    c=3,      
    d=3,
    f=d,   
}
MessageBox.Show(MyEnum.f.ToString());

OUTPUT
c

Answer 1

来自MSDN:

If multiple enumeration members have the same underlying value and you attempt to retrieve the string representation of an enumeration member s name based on its underlying value, your code should not make any assumptions about which name the method will return.

见。

Answer 2

The output is c because ToString resolves the index of the enum and prints out the representation at that index. In the first example, d=3, and the third indexed enum value is c. Similarly, when looking for the third index for k, it arrives at c before k, so that is again the output.

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