.NET之AutoMapper对象映射工具运用

Posted 2020-10-03

AutoMapper对象映射工具：主要是将某一个实体转成另一个实体。

1.引用NuGet包;搜索：AutoMapper

2.创建实体类

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

namespace AutoMapper
{
    public static class AutoMapperExtension
    {
        /// <summary>
        /// 单个对象映射
        /// </summary>
        /// <typeparam name="TSource">源对象</typeparam>
        /// <typeparam name="TDestination">目标对象</typeparam>
        /// <param name="source"></param>
        /// <returns></returns>
        public static TDestination MapTo<TSource, TDestination>(TSource source)
        {
            if (source == null) return default(TDestination);
            Mapper.Initialize(x => x.CreateMap(typeof(TSource), typeof(TDestination)));
            return Mapper.Map<TDestination>(source);
        }

        /// <summary>
        ///  集合列表类型映射  
        /// </summary>
        /// <typeparam name="TSource">源对象</typeparam>
        /// <typeparam name="TDestination">目标对象</typeparam>
        /// <param name="source"></param>
        /// <returns></returns>
        public static List<TDestination> MapToList<TSource, TDestination>(this IEnumerable<TSource> source)
        {
            if (source == null) return default(List<TDestination>);
            Mapper.Initialize(x => x.CreateMap(typeof(TSource), typeof(TDestination)));
            return Mapper.Map<List<TDestination>>(source);
        }
    }
}

3.作为例子。建立两个实体对象

（老会员实体）

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

namespace AutoMapper
{
   public  class UserModel
    {
        /// <summary>
        /// 会员编号
        /// </summary>
        public Int32 UserId { get; set; }

        /// <summary>
        /// 会员名称
        /// </summary>
        public String Name { get; set; }
    }
}

新会员实体

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

namespace AutoMapper
{
    /// <summary>
    /// 新会员表
    /// </summary>
    public class UserNewModel
    {
        /// <summary>
        /// 会员编号
        /// </summary>
        public Int32 UserId { get; set; }

        /// <summary>
        /// 会员名称
        /// </summary>
        public String Name { get; set; }
    }
}

4.使用方法。在项目过程中。如果需要将两个实体进行转化。使用实例

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

namespace AutoMapper
{
    public class Extension
    {
        /// <summary>
        /// 将user转成userNew
        /// </summary>
        public static void Model()
        {
            var user = new UserModel()
            {
                UserId = 1,
                Name = "王彬"
            };
            var userNew = new UserNewModel();
            //将老会员实体转成新会员实体
            var u = AutoMapperExtension.MapTo<UserModel,UserNewModel>(user);
            
        }

        public static void ModelList()
        {
            List<UserModel> Users = new List<UserModel>();

            var user = new UserModel()
            {
                UserId = 1,
                Name = "王彬"
            };

            Users.Add(user);

            var userNew = new List<UserNewModel>();
            //将老会员实体转成新会员实体
            var ulist = AutoMapperExtension.MapToList<UserModel, UserNewModel>(Users);
        }
    }
}