C#中FlagsAttribute属性在enum中的应用详解

enum MyFlags { Flag1, Flag2, Flag3, Flag4}; 
MyFlags myFlag = MyFlags.Flag2 | MyFlags.Flag3; 
Console.WriteLine(myFlag);//Flag4

[FlagsAttribute]
enum MyFlags{
   Flag1 = 0,  //000
   Flag2 = 1,  //001
   Flag3 = 2,  //010
   Flag4 = 4   //100
};

if((myFlag & MyFlags.Flag2) == MyFlags.Flag2)
{
   Console.WriteLine("true");
}
if((myFlag & MyFlags.Flag3) == MyFlags.Flag3)
 
{
   Console.WriteLine("true");
}

public enum CRUD
{
  Create,  
  Retrieve,
  Update,
  Delete
}

public sealed class ChineseAttribute : Attribute
{
  public string Chinese { get; set; }
  public ChineseAttribute(string _chinese = "未汉化")
  {
    Chinese = _chinese;
  }
}

public static string GetChinese(this Enum value)
{
  Type objType = value.GetType();
  Type attrType = typeof(ChineseAttribute);

  FieldInfo field = objType.GetField(value.ToString());

  //利用反射找是否有【Chinese】特性
  if (field.IsDefined(attrType))
  {
    var chinese = field.GetCustomAttribute<ChineseAttribute>();
    return chinese.Chinese;
  }
  //没有定义Chinese特性，直接返回具体指
  return value.ToString();
}

public enum CRUD
{
  [Chinese("创建")]
  Create,

  [Chinese("读取")]
  Retrieve,

  [Chinese]
  Update,
  Delete
}

static void Main(string[] args)
{
  List<MyEnum.CRUD> values = new List<MyEnum.CRUD> 
  { 
    MyEnum.CRUD.Create, 
    MyEnum.CRUD.Delete, 
    MyEnum.CRUD.Retrieve, 
    MyEnum.CRUD.Update 
  };

  foreach (var item in values)
  {
    Console.WriteLine(item.GetChinese());
  }
  Console.Read();
}