EmitMapper的入门

EmitMapper引用

EmitMapper案例

最近公司开发项目前端使用一个js框架，后端使用ef，js前台读取的json采用实体的dto来进行生成。

在网上看到了EmitMapper相对其他映射框架处理速度可以更快，就拿来用了。下面是代码中常用的几个块。

1.普通的映射。

    public class UserInfo

    {

        public int id { get; set; }

        public string name { get; set; }

        public string address { get; set; }

    }

    public class UserInfoDTO

    {

        public string name { get; set; }

        public string address { get; set; }

    }

    var mapper = ObjectMapperManager.DefaultInstance.GetMapper<UserInfo, UserInfoDTO>();
    UserInfoDTO userdto = mapper.Map(user);

2.有外键关联，需要映射出外键所带名字

    public class UserInfo

    {

        public int id { get; set; }

        public string name { get; set; }

        public string address { get; set; }

        public Teacher teacher { get; set; }

    }

    public class Teacher

    {

        public int id { get; set; }

        public string name { get; set; }

    }

    public class UserInfoDTO

    {

        public int id { get; set; }

        public string name { get; set; }

        public string teacher { get; set; }

    }

    var user = new UserInfo {

                id = 12,

                name = "张三",

                address = "北京",

                teacher = new Teacher {

                    id = 11,

                    name = "王五"

                }

            };

     var mapper = ObjectMapperManager.DefaultInstance.GetMapper<UserInfo, UserInfoDTO>(

                new DefaultMapConfig()

                .ConvertUsing<Teacher, string>(t => t.name)

                );

     UserInfoDTO userdto = mapper.Map(user);

3.两个实体之间名字不一致，需要映射。

    public class UserInfo

    {

        public int id { get; set; }

        public string name { get; set; }

        public string address { get; set; }

    }

    public class UserInfoDTO

    {

        public int id { get; set; }

        public string name { get; set; }

        public string userAddress { get; set; }

    }

    var mapper = ObjectMapperManager.DefaultInstance.GetMapper<UserInfo, UserInfoDTO>(

                new DefaultMapConfig()

                .MatchMembers((x, y) =>

                {

                    if (x == "address" && y == "userAddress")

                    {

                        return true;

                    }

                    return x == y;

                })

                );

    UserInfoDTO userdto = mapper.Map(user);

4.需要对某一个字段进行特殊处理

    public class UserInfo

    {

        public int id { get; set; }

        public string name { get; set; }

        public string address { get; set; }

    }

    public class UserInfoDTO

    {

        public string id { get; set; }

        public string name { get; set; }

        public string userAddress { get; set; }

        public string userJson { get; set; }

    }

    var user = new UserInfo {

                id = 12,

                name = "张三",

                address = "北京"

            };

    var mapper = ObjectMapperManager.DefaultInstance.GetMapper<UserInfo, UserInfoDTO>(

                new DefaultMapConfig()

                .PostProcess<UserInfoDTO>((value, state) =>

                {

                    //在id编号前加上今年的年份

                    value.id = DateTime.Now.ToString("yyyy") + value.id;

                    //实体的json格式

                    value.userJson = "{\"id\":\"" + value.id + "\",\"name\":\"" + value.name + "\"}";

                    return value;

                })

            );

     UserInfoDTO userdto = mapper.Map(user);

5.忽略掉某个字段的映射

    public class UserInfo

    {

        public int id { get; set; }

        public string name { get; set; }

        public string address { get; set; }

    }

    public class UserInfoDTO

    {

        public string id { get; set; }

        public string name { get; set; }

        public string address { get; set; }

    }

    var user = new UserInfo {

                id = 12,

                name = "张三",

                address = "北京"

            };

    var mapper = ObjectMapperManager.DefaultInstance.GetMapper<UserInfo, UserInfoDTO>(

                new DefaultMapConfig()

                .IgnoreMembers<UserInfo, UserInfoDTO>(new string[] { "name" })

            );

    UserInfoDTO userdto = mapper.Map(user);

6.给空元素赋默认值

    public class UserInfo

    {

        public int id { get; set; }

        public string name { get; set; }

        public string address { get; set; }

        public DateTime? godate { get; set; }

    }

    public class UserInfoDTO

    {

        public string id { get; set; }

        public string name { get; set; }

        public string address { get; set; }

        public DateTime godate { get; set; }

    }

    var user = new UserInfo {

                id = 12,

                name = "张三",

                address = null,

                godate = null

            };

    var mapper = ObjectMapperManager.DefaultInstance.GetMapper<UserInfo, UserInfoDTO>(

                new DefaultMapConfig()

                //如果日期为空设置为当前时间

                .NullSubstitution<DateTime?, DateTime>((value) => DateTime.Now)

                //如果string类型为null赋值为“”

                .NullSubstitution<string, string>((value) => "")

            );

    UserInfoDTO userdto = mapper.Map(user);

常用的就上面几点，对于更深入的。有待以后研究。。。。。

本篇文章引用：园友(Arik lee) 的 http://www.cnblogs.com/ariklee/p/3833598.html，总结相对比较全

巴特西

EmitMapper系列之二：EmitMapper的使用小结

EmitMapper的入门

EmitMapper引用

EmitMapper案例

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