【C#】枚举值

示例代码

    public enum TypeEnum
    {
        [Text("进行中")]
        Doing = 1,
        [Text("完成")]
        Done = 2,
        [Text("已被删除")]
        Deleted = 9,
    }
    public class TextAttribute : Attribute
    {
        public TextAttribute(string value)
        {
            Value = value;
        }
        public string Value { get; set; }
    }

    public static class Utils
    {
        public static T ToEnum<T>(this int value) where T : struct, Enum
        {
            if (Enum.TryParse(value.ToString(), out T e) == false || Enum.IsDefined(typeof(T), e) == false)
                throw new Exception(value + " 转换失败");

            return e;
        }

        public static T ToEnum<T>(this string value) where T : struct, Enum
        {
            if (Enum.TryParse(value, out T e) == false || Enum.IsDefined(typeof(T), e) == false)
                throw new Exception(value + " 转换失败");

            return e;
        }
    }

测试代码

        static void Test06()
        {
            TypeEnum typeEnum = TypeEnum.Doing;
            int v1 = (int)typeEnum;
            string v2 = typeEnum.ToString();
            string v3 = string.Empty;

            var enumType = typeEnum.GetType();
            {
                var fieldInfo = enumType.GetField(typeEnum.ToString());
                var attrs = fieldInfo.GetCustomAttributes(typeof(TextAttribute), false);
                if (attrs.Length == 1)
                {
                    v3 = ((TextAttribute)attrs[0]).Value;
                }
            }

            Console.WriteLine("int=>" + v1);//1
            Console.WriteLine("name=>" + v2);//Doing
            Console.WriteLine("text=>" + v3);//进行中
            Console.WriteLine("");

            int n1 = 1;//转换成功
            int n2 = 5;//转换失败
            string s1 = "Doing";//转换成功
            string s2 = "DDDD";//转换失败

            List<object> lst = new List<object> { n1, n2, s1, s2, };
            foreach (var item in lst)
            {
                try
                {
                    var e = item.ToString().ToEnum<TypeEnum>();

                    Console.WriteLine($"{item} => 转换成功");
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"{item} => 转换失败，{ex.Message}");
                }
            }
            Console.WriteLine("");

            foreach (TypeEnum value in Enum.GetValues(enumType))
            {
                string name = Enum.GetName(enumType, value);
                var fieldInfo = enumType.GetField(name);
                var attrs = fieldInfo.GetCustomAttributes(typeof(TextAttribute), false);
                if (attrs.Length == 1)
                {
/*
Value: 1, Name: Doing, Text: 进行中
Value: 2, Name: Done, Text: 完成
Value: 9, Name: Deleted, Text: 已被删除
*/
                    Console.WriteLine($"Value: {(int)value}, Name: {name}, Text: {((TextAttribute)attrs[0]).Value}");
                }
            }
        }

结果

int=>1
name=>Doing
text=>进行中

1 => 转换成功
5 => 转换失败，5 转换失败
Doing => 转换成功
DDDD => 转换失败，DDDD 转换失败

Value: 1, Name: Doing, Text: 进行中
Value: 2, Name: Done, Text: 完成
Value: 9, Name: Deleted, Text: 已被删除
ok