C#利用反射+特性实现简单的实体映射数据库操作类

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 反射_特性
{
    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
    public class FieldAttribute : Attribute
    {
        private string _Fields;
        /// <summary>
        /// 字段名称
        /// </summary>
        public string Fields
        {
            get { return _Fields; }

        }

        private DbType _Dbtype;
        /// <summary>
        /// 字段类型
        /// </summary>
        public DbType Dbtype
        {
            get { return _Dbtype; }

        }

        private int _ValueLength;
        /// <summary>
        /// 字段值长度
        /// </summary>
        public int ValueLength
        {
            get { return _ValueLength; }

        }
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="fields"> 字段名</param>
        /// <param name="types"> 字段类型</param>
        /// <param name="i"> 字段值长度</param>
        public FieldAttribute(string fields, DbType types, int i)
        {

            _Fields = fields;
            _Dbtype = types;
            _ValueLength = i;
        }
    }
}

2:表名特性

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 反射_特性
{
    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
    public class TableAttribute : Attribute
    {
        private string _TableName;
        /// <summary>
        /// 映射的表名
        /// </summary>
        public string TableName
        {
            get { return _TableName; }
        }
        /// <summary>
        /// 定位函数映射表名；
        /// </summary>
        /// <param name="table"></param>
        public TableAttribute(string table)
        {
            _TableName = table;
        }
    }
}

3:特性测试类

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 特性_反射
{
    [Table("Consumers")]
    public class UserInf
    {
        private string _UserID;
        /// <summary>
        /// 登陆ID
        /// </summary>
        [Field("ConsumerID", DbType.String, 12)]
        public string U_UserID
        {
            get { return _UserID; }
            set { _UserID = value; }
        }

        private string _Psw;
        /// <summary>
        /// 登陆密码
        /// </summary>
        [Field("ConsumerPwd", DbType.String, 12)]
        public string U_Psw
        {
            get { return _Psw; }
            set { _Psw = value; }
        }

        private string _UserName;
        /// <summary>
        /// 用户别称
        /// </summary>
        [Field("ConsumerName", DbType.String, 50)]
        public string U_UserName
        {
            get { return _UserName; }
            set { _UserName = value; }
        }

        private string _City;
        /// <summary>
        /// 所住城市
        /// </summary>
        [Field("UserCity", DbType.String, 50)]
        public string U_City
        {
            get { return _City; }
            set { _City = value; }
        }

        private int _Popedom;
        /// <summary>
        /// 权限
        /// </summary>
        [Field("popedom", DbType.Int32, 0)]
        public int U_Popedom
        {
            get { return _Popedom; }
            set { _Popedom = value; }
        }

        private DateTime _AddDataTime;
        /// <summary>
        /// 注册时间
        /// </summary>
        [Field("addDataTime", DbType.Date, 0)]
        public DateTime U_AddDataTime
        {
            get { return _AddDataTime; }
            set { _AddDataTime = value; }
        }

        private int _Sex;
        /// <summary>
        /// 性别
        /// </summary>
        [Field("Sex", DbType.Int32, 0)]
        public int U_Sex
        {
            get { return _Sex; }
            set { _Sex = value; }
        }

        private int _BirthTime;
        /// <summary>
        /// 出身日期；
        /// </summary>
        [Field("BirthTime", DbType.String, 9)]
        public int U_BirthTime
        {
            get { return _BirthTime; }
            set { _BirthTime = value; }
        }
    }
}

4:测试控制台程序

                UserInf userss = new UserInf();
                userss.U_UserID = "aw12311";
                userss.U_Psw = "123";
                userss.U_UserName = "aw";
                userss.U_City = "武汉";
                userss.U_Popedom = 1;
                userss.U_Sex = 1;
                userss.U_BirthTime = 19900114;
                userss.U_AddDataTime = DateTime.Now;

                DateIsTableAttribute<UserInf> t = new DateIsTableAttribute<UserInf>();

                Response.Write(" </br>" + t.insertDate(userss));