枚举作为参数：获取名称和索引

Question

I have an enum like this:

public enum Global
{
  txt_test = 123
}

Now I want to use a call like this:

var text = lib.Get(Global.txt_test);

Method:

public TextString Get(Enum enumeration)
{
  string name = enumeration.ToString();
  int index = ?;  // (int)enumeration not working      
  ...
}

How to get the index of an enum in this case? Or am I doing it wrong at all?

Thank you.

Solution:

public TextString Get(Enum enumeration)
{
   string name = enumeration.ToString();
   int index = Convert.ToInt32(enumeration);    
   ...
}

Answer 1

Enum are convertible to int for retrieving their values:

public TextString Get(Enum enumeration)
{
  string name = enumeration.ToString();
  int index = Convert.ToInt32(enumeration);

  // ...
  return null;
}

Note that this will work because your enumeration is type of int by default. Enums can still be other value type like long :

enum Range : long { Max = 2147483648L, Min = 255L };

In this case, the conversion will lost precision.

Answer 2

If you only need the enum value (what you are calling "index") as a string, the best way is to use custom format strings as documented here: http://msdn.microsoft.com/en-us/library/c3s1ez6e%28v=vs.110%29.aspx

For example:

public TextString Get(Enum enumeration)
{
  string index = enumeration.ToString("D");

  // ...
  return null;
}