1、AutoMapper简介
用于两个对象映射，例如把Model的属性值赋值给View Model。传统写法会一个一个属性的映射很麻烦，使用AutoMapper两句代码搞定。
2、AutoMapper安装
推荐使用nuget搜索AutoMapper安装
3、AutoMapper简单用法
先建个model
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web; namespace cms.Web.Models
{public class book
{
public int ID { get; set; }
public string name { get; set; }
public string className { get; set; }
} public class bookViewModel
{
public int ID { get; set; }
public string name { get; set; }
public string className { get; set; }
public int price { get; set; }
public string des { get; set; }
}
}
controller代码
public object ceshi()
{
book data = new book { ID = , name = "少年1号", className = "娱乐" }; //映射初始化写法1
Mapper.Initialize(x => x.CreateMap<book, bookViewModel>()); ////映射初始化写法2
//Mapper.Initialize(config =>
//{
// config.CreateMap<book, bookViewModel>(); //}); ////映射初始化写法3
//var cfg = new MapperConfigurationExpression();
//cfg.CreateMap<book, bookViewModel>();
//cfg.CreateMap<bookViewModel, book>();
//Mapper.Initialize(cfg); //映射-写法1：由AutoMapper创建目标对象
var vmodel = Mapper.Map<book, bookViewModel>(data); //映射 - 写法2：让AutoMapper把源对象中的属性值合并 / 覆盖到目标对象（推荐）
bookViewModel vmodel2 = new bookViewModel();
Mapper.Map(data, vmodel2);
Mapper.Reset();//没有这句代码刷新页面会出错 //return vmodel.ToString();
return JsonConvert.DeserializeObject(JsonConvert.SerializeObject(vmodel2));
}
4、AutoMapper扩展类
https://www.cnblogs.com/jianxuanbing/p/7122877.html
很多时候我们使用AutoMapper的时候，都需要进行一个配置才可以使用Mapper.Map<Source,Target>(entity);。如果不进行配置则会报错。
如果实体过多，有时候会忘记是否有配置，只有运行的时候才会发现这个BUG。
该扩展基于AutoMapper 6.x版本，因此需要从Nuget下载相应的包。
该扩展对于Object以及List<T>进行了兼容支持，因此MapTo<TSource,TDestination>()可以直接映射实体与泛型列表。
AutoMapperHelper.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Web;
using AutoMapper;
using System.Globalization;
namespace cms.Web.App_Code
{
public static class AutoMapperHelper
{
/// <summary>
/// 同步锁
/// </summary>
private static readonly object Sync = new object(); #region MapTo(将源对象映射到目标对象) /// <summary>
/// 将源对象映射到目标对象
/// </summary>
/// <typeparam name="TSource">源类型</typeparam>
/// <typeparam name="TDestination">目标类型</typeparam>
/// <param name="source">源对象</param>
/// <param name="destination">目标对象</param>
/// <returns></returns>
public static TDestination MapTo<TSource, TDestination>(this TSource source, TDestination destination)
{
return MapTo<TDestination>(source, destination);
} /// <summary>
/// 将源对象映射到目标对象
/// </summary>
/// <typeparam name="TDestination">目标类型</typeparam>
/// <param name="source">源对象</param>
/// <returns></returns>
public static TDestination MapTo<TDestination>(this object source) where TDestination : new()
{
return MapTo(source, new TDestination());
} /// <summary>
/// 将源对象映射到目标对象
/// </summary>
/// <typeparam name="TDestination">目标类型</typeparam>
/// <param name="source">源对象</param>
/// <param name="destination">目标对象</param>
/// <returns></returns>
private static TDestination MapTo<TDestination>(object source, TDestination destination)
{
if (source == null)
{
throw new ArgumentNullException("source is null");
}
if (destination == null)
{
throw new ArgumentNullException("destination is null");
}
var sourceType = GetType(source);
var destinationType = GetType(destination);
var map = GetMap(sourceType, destinationType);
if (map != null)
{
return Mapper.Map(source, destination);
}
lock (Sync)
{
map = GetMap(sourceType, destinationType);
if (map != null)
{
return Mapper.Map(source, destination);
}
InitMaps(sourceType, destinationType);
}
return Mapper.Map(source, destination);
} /// <summary>
/// 获取映射配置
/// </summary>
/// <param name="sourceType">源类型</param>
/// <param name="destinationType">目标类型</param>
/// <returns></returns>
private static TypeMap GetMap(Type sourceType, Type destinationType)
{
try
{
return Mapper.Configuration.FindTypeMapFor(sourceType, destinationType);
}
catch (InvalidOperationException)
{
lock (Sync)
{
try
{
return Mapper.Configuration.FindTypeMapFor(sourceType, destinationType);
}
catch (InvalidOperationException)
{
InitMaps(sourceType, destinationType);
}
return Mapper.Configuration.FindTypeMapFor(sourceType, destinationType);
}
}
} /// <summary>
/// 获取类型
/// </summary>
/// <param name="obj">对象</param>
/// <returns></returns>
private static Type GetType(object obj)
{
var type = obj.GetType();
if (obj is System.Collections.IEnumerable == false)
{
return type;
}
if (type.IsArray)
{
return type.GetElementType();
}
var genericArgumentsTypes = type.GetTypeInfo().GetGenericArguments();
if (genericArgumentsTypes == null || genericArgumentsTypes.Length == )
{
throw new ArgumentException("泛型类型参数不能为空");
}
return genericArgumentsTypes[];
} /// <summary>
/// 初始化映射配置
/// </summary>
/// <param name="sourceType">源类型</param>
/// <param name="destinationType">目标类型</param>
private static void InitMaps(Type sourceType, Type destinationType)
{
try
{
var maps = Mapper.Configuration.GetAllTypeMaps();
Mapper.Initialize(config =>
{
ClearConfig();
foreach (var item in maps)
{
config.CreateMap(item.SourceType, item.DestinationType);
}
config.CreateMap(sourceType, destinationType);
});
}
catch (InvalidOperationException)
{
Mapper.Initialize(config =>
{
config.CreateMap(sourceType, destinationType);
});
}
} /// <summary>
/// 清空配置
/// </summary>
private static void ClearConfig()
{
var typeMapper = typeof(Mapper).GetTypeInfo();
var configuration = typeMapper.GetDeclaredField("_configuration");
configuration.SetValue(null, null, BindingFlags.Static, null, CultureInfo.CurrentCulture);
} #endregion #region MapToList(将源集合映射到目标列表) /// <summary>
/// 将源集合映射到目标列表
/// </summary>
/// <typeparam name="TDestination">目标元素类型，范例：Sample，不用加List</typeparam>
/// <param name="source">源集合</param>
/// <returns></returns>
public static List<TDestination> MapToList<TDestination>(this System.Collections.IEnumerable source)
{
return MapTo<List<TDestination>>(source);
} #endregion
}
}
用法，非常简单
public object ceshi()
{
bookViewModel vmodel2 = new bookViewModel(); AutoMapperHelper.MapTo(data, vmodel2); return JsonConvert.DeserializeObject(JsonConvert.SerializeObject(vmodel2));
}
public object ceshi2()
{
dbEntities db = new dbEntities();
var list = db.news;
var list2 = AutoMapperHelper.MapToList<news>(list);
return JsonConvert.DeserializeObject(JsonConvert.SerializeObject(list2));
}
5、AutoMapper高级用法
https://www.cnblogs.com/youring2/p/automapper.html
http://www.cnblogs.com/1-2-3/p/AutoMapper-Best-Practice.html