using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Linq;
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using System.Text;
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using System.Reflection;
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namespace ConsoleApplication6
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{ |
/// <summary>
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/// AttributeTargets.Class可以对类应用属性
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/// Inherited能否由派生类或重写成员继承
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/// AllowMultiple能否为一个程序元素指定多个指示属性实例
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/// 也就是说AllowMultiple=false 对于一个类型，该特性只能用一次
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/// 若一个Class类型前面出现多个TableAttribute，则会出现编译错误
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/// </summary>
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[AttributeUsage(AttributeTargets.Class,Inherited=true,AllowMultiple=false)]
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public class TableAttribute : Attribute
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{
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private string _tableName;
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public TableAttribute()
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{
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}
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public TableAttribute(string tableName)
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{
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this._tableName = tableName;
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}
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public string TableName
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{
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get
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{
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return this._tableName;
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}
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set
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{
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this._tableName = value;
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}
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}
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}
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/// <summary>
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/// 列特性
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/// AttributeTargets.Property可以对属性应用特性
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/// </summary>
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[AttributeUsage(AttributeTargets.Property,Inherited=false,AllowMultiple=false)]
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public class ColumAttribute : Attribute
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{
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private string _columName;
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private DbType _dbType;
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public ColumAttribute()
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{
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}
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public ColumAttribute(string columName)
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{
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this._columName = columName;
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}
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public ColumAttribute(string columName, DbType dbType)
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{
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this._columName = columName;
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this._dbType = dbType;
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}
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public string ColumName
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{
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get
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{
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return this._columName;
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}
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set
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{
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this._columName = value;
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}
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}
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public DbType DbTypeAttr
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{
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get
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{
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return this._dbType;
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}
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set
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{
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_dbType = value;
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}
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}
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}
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[Table("User")]
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public class User
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{
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[Colum("userId",DbType.Int32)]
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public int UserId { get; set; }
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[Colum("userName", DbType.String)]
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public string UserName { get; set; }
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}
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class Program
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{
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static void Main(string[] args)
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{
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User u = new User();
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u.UserId = 6;
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u.UserName = "allen";
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Type myObjType = u.GetType();
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Dictionary<string,string> columName = new Dictionary<string,string>();
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//获取自定义特性
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object temp = myObjType.GetCustomAttributes(typeof(TableAttribute),false).First();
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TableAttribute myAttr = temp as TableAttribute;
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Console.WriteLine("表名：{0}", myAttr.TableName);
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Console.WriteLine("列的名称和值：");
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foreach (PropertyInfo pi in myObjType.GetProperties())
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{
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object attr = pi.GetCustomAttributes(false).First();
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ColumAttribute cattr = attr as ColumAttribute;
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Console.WriteLine("{0}:{1}",cattr.ColumName,pi.GetValue(u,null));
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}
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Console.ReadKey();
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}
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}
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} |