1.枚举获取特性，转换值

using System;using System.Reflection;namespace MyAttribute{    public static class HelloExtesion    {        public static string GetStr(this Enum e)        {            Type type = typeof(UserState);            FieldInfo p = type.GetField(e.ToString());            if (p.IsDefined(typeof(CSAttribute), true))            {                CSAttribute cs = p.GetCustomAttribute(typeof(CSAttribute)) as CSAttribute;                return cs.Name;            }            else            {                return e.ToString();            }        }    }    public enum UserState    {        [CS("富人")]        Rich = 1,        [CS("一般人")]        Normal = 2,        //[CS("穷人")]        Poor = 3,    }    public class CSAttribute : Attribute    {        public string Name { set; get; }        public CSAttribute(string Name)        {            this.Name = Name;        }    }}

 

2.特性验证字段格式

using HomeWork1.AttributeModels;using System;using System.Reflection;namespace HomeWork1.Tool{    public static class ValidateTool    {        public static void ValidateEntity
      
       (this T t) where T : class        {            Type type = typeof(T);            foreach (var prop in type.GetProperties())            {                if(prop.IsDefined(typeof(AbstractAttribute),true))                {                    foreach (AbstractAttribute item in prop.GetCustomAttributes(typeof(AbstractAttribute)))                    {                        string s = item.Validate(prop.GetValue(t));                        if (!string.IsNullOrEmpty(s))                        {                            throw new Exception($"{prop.GetChinese()}({prop.Name}):{s}");                        }                    }                }            }        }        public static string GetColumnName(this PropertyInfo Prop)        {            if (Prop.IsDefined(typeof(ColumnAttribute), true))            {                return (Prop.GetCustomAttribute(typeof(ColumnAttribute)) as ColumnAttribute).Name;            }            return Prop.Name;        }        public static string GetTableName(this Type type)        {            if (type.IsDefined(typeof(TableNameAttribute), true))            {                return (type.GetCustomAttribute(typeof(TableNameAttribute)) as TableNameAttribute).Name;            }            return type.Name;        }        public static string GetChinese(this PropertyInfo Prop)        {            if (Prop.IsDefined(typeof(ChineseAttribute), true))            {                return (Prop.GetCustomAttribute(typeof(ChineseAttribute)) as ChineseAttribute).Name;            }            return Prop.Name;        }    }}