.Net C# 枚举

      1.枚举的概念

      枚举的定义罗列出了所有可能的取值，枚举变量的值只能是罗列出的值之一，例如：

     

 public enum FormStatus
 {
    WaitApprove,Approved,Reject
 }

 

 

 枚举元素的默认基础类型为 int。默认情况下，第一个枚举数的值为 0，后面每个枚举数的值依次递增 1。也可以自己定义枚举的值：

 

public enum FormStatus
 {
    WaitApprove = 100,
    Approved = 200,
    Reject = 300
 }

 

 

 2.枚举的使用

 

FormStatus fs = FormStatus.WaitApprove;

//Enum 转 Int
int fsValue = (int)fs;
Console.WriteLine(fsValue);

//int 转Enum
fs = (FormStatus)1;
Console.WriteLine(fs);

//判断枚举值
if(fs.Equals(FormStatus.Approved))
{
    Console.WriteLine("该单据已经被签核！");
}
   
//遍历所有的值
Type fsType = typeof(FormStatus);
Console.WriteLine("The status of the Form, and their corresponding values are:");
foreach (string s in Enum.GetNames(fsType) )
   Console.WriteLine( "{0,-11}= {1}", s, Enum.Format( fsType, Enum.Parse(fsType, s),"d"));
   Console.ReadLine();