public enum Hw_EnumPlatType
    {
        [Description("淘寶")]
        TaoBao = 1,
        [Description("天貓")]
        TianMao = 2,
        [Description("京東")]
        JingDong = 3,
    }

 Hw_EnumPlatType a;
 var flag = Enum.TryParse("TaoBao", true, out a);       //true     
 flag = Enum.TryParse("aaa", true, out a);      //false     a=0
 flag = Enum.TryParse(1.ToString(), true, out a);//true   
 flag = Enum.TryParse(100.ToString(), true, out a);//true  a=100   

 flag = Enum.IsDefined(typeof(Hw_EnumPlatType), "TaoBao");      //true
 flag = Enum.IsDefined(typeof(Hw_EnumPlatType), "aaa");  //false
 flag = Enum.IsDefined(typeof(Hw_EnumPlatType), 100);      //false
 flag = Enum.IsDefined(typeof(Hw_EnumPlatType), 1);      //true
 flag = Enum.IsDefined(typeof(Hw_EnumPlatType), 1.ToString());   //false

  /// <summary>
  /// 判斷枚舉(TryParse判斷不準確)
  /// </summary>
  /// <param name="value">如果是int，不能是string類型，會被當成Name判斷</param>
  public static TEnum CheckEnum<TEnum>(this object value) where TEnum : struct
  {
      if (!Enum.IsDefined(typeof(TEnum), value))
      {
          Console.WriteLine（"枚舉轉換錯誤！");
      }
      return (TEnum)Enum.Parse(typeof(TEnum), value.ToString(), true);
  }