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README
Apache-2.0

RobotMapper

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项目地址:https://gitee.com/wuyuege/RobotMapper


RobotMapper诞生背景

  1. 在日常项目开发中,需要将数据访问层的Entity转化为数据传输层的DTO,或者将数据传输层的DTO转化为前端的ViewModel,而手写转换方法很烦,而且随着结构的增加,类的增加,代码量会比较大且不利于更新维护,因此需要一款能够自动映射工具帮我们实现这些工作。
  2. 我们对映射工具也有如下要求:
  • 转化效率必须高:显然,查询数据只需要0.001毫秒但是映射花费1秒这是我们不能接受的;
  • 配置必须简单甚至无需配置或者自动配置:每次映射都需要进行复杂的配置无异于手动映射让人烦躁;
  • 解决循环引用问题:尤其是数据访问层,由于数据库表之间的关系,我们的Entity会有很多一对一,一对多,多对多的导航属性,类型之间的互相引用必不可少,传统的映射工具无法自动解决该问题,要么进入死循环要么映射效率低下;

那么本映射工具“RobotMapper”就是为了解决以上问题而诞生的,是的,它叫RobotMapper,一切都是自动化完成!


RobotMapper使用介绍

让我们先创建对应的DTO和Entity

Entity

namespace Entity
{
    public class User
    {
        public User()
        {
            Roles = new List<Role>();
        }
        public string Id { get; set; }
        public string Name { get; set; }
        public string Code { get; set; }
        public string Department { get; set; }
        public List<Role> Roles { get; set; }
        public User User12 { get; set; }
    }
}

namespace Entity
{
    public class Role
    {
        public string Name { get; set; }

        public List<User> Users { get; set; }
    }
}

DTO

namespace DTO
{
    public class User
    {
        public User()
        {
            Roles = new List<Role>();
        }
        public string Id { get; set; }
        public string Name { get; set; }
        public string Code { get; set; }
        public string Department { get; set; }
        public List<Role> Roles { get; set; }
        public User User12 { get; set; }
        public string UserName { get; set; }
    }
}

namespace DTO
{
    public class Role
    {
        public string Name { get; set; }

        public List<User> Users { get; set; }
    }
}

接下来创建User

public static User 创建扁平化User()
{
    Entity.User user = new User()
    {
        Code = "Liuhai",
        Id = "hai.liu",
        Department = "部门1",
        Name = "海哥",
    };
    return user;
}
  1. 无需配置
var user = TestHelper.创建扁平化User();
var newuser = user.RobotMap<User, DTO.User>();
Assert.AreEqual(user.Code, newuser.Code);
Assert.AreEqual(user.Id, newuser.Id);
Assert.AreEqual(user.Department, newuser.Department);
Assert.AreEqual(user.Name, newuser.Name);

  1. 解决循环引用
    创建一个循环引用User
public static User 创建循环引用User()
{
    Entity.User user = new User()
    {
        Code = "Liuhai",
        Id = "hai.liu",
        Department = "部门1",
        Name = "海哥",
    };
    user.Roles.Add(new Role()
    {
        Name = "角色1",
        Users = new List<User>() { new User() { Name = "SB" } }
    });

    return user;
}

仍然是自动映射

var user = TestHelper.创建循环引用User();
var newuser = user.RobotMap<User, DTO.User>();
Assert.AreEqual(user.Code, newuser.Code);
Assert.AreEqual(user.Id, newuser.Id);
Assert.AreEqual(user.Department, newuser.Department);
Assert.AreEqual(user.Name, newuser.Name);
Assert.IsTrue(newuser.Roles.Count == 1);

  1. 效率问题
var user = TestHelper.创建循环引用User();
for (int i = 1; i <= 100000; i++)
{
    var newuser = user.RobotMap<User, DTO.User>();
}

以上代码大家可自行测试,映射十万次:仅需1s


  1. 批量映射
List<User> users = new List<User>();
for (int i = 1; i <= 10000; i++)
{
    var user = TestHelper.创建循环引用User();
    users.Add(user);
}
var newusers = users.RobotMap<User, DTO.User>();

以上代码大家可自行测试,批量映射一万条:仅需190毫秒


其他功能:

  • 支持自定义映射配置:
[TestMethod]
public void 测试配置Bind()
{
    Mapper.Initialize(creator =>
    {
        creator.CreatMap<User, DTO.User>(config =>
        {
            config.Bind(x => x.User12.Name, y => y.UserName);
            config.BindName(x => x.User12, y => y.User13);
            config.Ignore(y => y.Roles);
        });
    });
}

  • 支持忽略属性:
[TestMethod]
public void 测试忽略规则转换()
{
    Mapper.Initialize(creator =>
    {
        creator.CreatMap<User, DTO.User>(config =>
        {
            config.Ignore(y => y.Code);
            config.Ignore("Department", "Name");
        });
    });
    var user = TestHelper.创建扁平化User();
    var newuser = user.RobotMap<User, DTO.User>();
    Assert.IsNull(newuser.Code);
    Assert.IsNull(newuser.Department);
    Assert.IsNull(newuser.Name);
}

  • 支持即用即配
[TestMethod]
public void 测试即用即配绑定()
{
    var user = TestHelper.创建自引用User();
    var newuser = user.RobotMap<User, DTO.User>(config=> 
    {
        config.Bind(x => x.User12.Name, y => y.UserName);
        config.BindName(x => x.User12, y => y.User13);
    });
    Assert.AreEqual(user.User12.Name, newuser.UserName);
}
[TestMethod]
public void 测试即用即配忽略()
{
    var user = TestHelper.创建扁平化User();
    var newuser = user.RobotMap<User, DTO.User>(config=> 
    {
        config.Ignore(y => y.Code);
        config.Ignore("Department", "Name");
    });
    Assert.IsNull(newuser.Code);
    Assert.IsNull(newuser.Department);
    Assert.IsNull(newuser.Name);
}

  • 子类映射启用父类策略

在类与类之间进行映射时,当没有配置两者之间的映射关系时,可自动启用父类映射绑定规则:
==优先级为:源子类-目标子类>>源父类->>目标子类->>源->>目标父类->>源父类->>目标父类==
使用详情可查看: 子类映射启用父类策略

注:即用即配的策略仅在本次映射中生效,与全局配置互不影响!

详细文档:


最后希望大家能为我找出bug,也希望大家能够给我提一些意见和建议!

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简介

在实际的项目中,我们一般需要将Entity映射为DTO,或者将DTO映射为ViewModel,我们的Model中循环引用可以说很多,例如Entity的外键等,而一般的映射工具例如Automapper在处理这类映射的时候效率很低,其他的映射工具又有着复杂的初始化配置,那么一款无需配置就可映射,并能自动解决循环引用问题的Mapper工具就此诞生,本映射工具就是为了解决这些问题而诞生的!将其命名为RobotMapper,意味着他就是“机器人映射”,你不需要做任何配置就能自动映射! 展开 收起
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