Remark特性扩展

　

remark

Remark特性扩展

1.假设程序中有一个枚举类型UserState：

public enum UserState
    {
        //通过增加特性，扩展Remake

        /// <summary>
        /// 正常
        /// </summary>
        [Remark("正常")]
        Normal =0,
        /// <summary>
        ///冻结
        /// </summary>
        [Remark("冻结")]
        Frezeen =2,
        /// <summary>
        /// 删除
        /// </summary>
        Delete=4
    }

我们想要在程序中使用的是枚举值，但是提供给UI界面的是另外的字符串，就可以用到特性加扩展方法来实现。

2.增加一个RemakeAttribute特性

 [attributeusage(AttributeTargets.Enum | AttributeTargets.field)]
    public class RemarkAttribute:Attribute
    {
        private string _Remake=null;
        public RemarkAttribute(string remake)
        {
            this._Remake = remake;
        }

        public string GetRemark()
        {
            return this._Remake;
        }
    }

3.增加一个扩展方法AttributeExtension

 public static string GetRemark(this Enum value)
        {
            Type type = value.GetType();
            FieldInfo field = type.GetField(value.ToString());
            if (field.Isdefined(typeof(RemarkAttribute), true))
            {
                RemarkAttribute attribute = (RemarkAttribute)field.GetCustomAttribute(typeof(RemarkAttribute), true);
                return attribute.GetRemark();
            }
            else
            {
                return value.ToString();
            }
        }

4.前端使用：

           try
            {
                UserState userState = UserState.Normal;            
                console.WriteLine(userState.GetRemark());                    
                Console.WriteLine(UserState.Frezeen.GetRemark());
                Console.WriteLine(UserState.Delete.GetRemark());
                Console.Read();
            }
            catch (Exception)
            {

                throw;
            }

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