(精华)2020年9月21日 ASP.NET Core AutoMapper的使用-白红宇的个人博客

(精华)2020年9月21日 ASP.NET Core AutoMapper的使用

发布日期：2021-06-29 15:12:24 浏览次数：2 分类：技术文章

本文共 9515 字，大约阅读时间需要 31 分钟。

没有AutoMapper需要一个一个赋值

public class Sample01{
       public static void Run()    {
           var result = GetStudents();        var students = new List
   
    ();        foreach (var item in result)        {
               var student = new StudentViewModel            {
                   Id = item.Id,                Age = item.Age,                Name = item.Name,                Gender = item.Gender            };            students.Add(student);        }        Print(students);    }    public static List
    
      GetStudents()    {
           var context = new SampleContext();        return context.Students;    }    public static void Print(IList
     
       studentViewModels)    {
           foreach (var student in studentViewModels)        {
               Console.WriteLine($"Id={student.Id};Name={student.Name};");        }    }}

AutoMapper配置映射

public class Sample02    {
           public static void Run()        {
                           var config = new MapperConfiguration(cfg => cfg.CreateMap
   
    ());            var mapper = config.CreateMapper();            var result = GetStudents();            var students = mapper.Map
    
     
      >(result);            Print(students);        }        public static List
      
        GetStudents()        {
               var context = new SampleContext();            return context.Students;        }        public static void Print(IList
       
         studentViewModels)        {
               foreach (var student in studentViewModels)            {
                   Console.WriteLine($"Id={student.Id};Name={student.Name};Age={student.Age};Gender={student.Gender}");            }        }    }

AutoMapper 扁平化映射

public static void Run(){
       var config = new MapperConfiguration(cfg =>    {
           cfg.CreateMap
   
    ()            .ForMember(                model => model.City,                expression => expression.MapFrom(user => user.Address.City))            .ForMember(                model => model.Country,                expression => expression.MapFrom(user => user.Address.Country))            .ForMember(                model => model.State,                expression => expression.MapFrom(user => user.Address.State));    });    var mapper = config.CreateMapper();    var result = GetUsers();    var users = mapper.Map
    
     
      >(result);    Print(users);}public static List
      
        GetUsers(){
       var context = new SampleContext();    return context.Users;}public static void Print(IList
       
         userViewModels){
       foreach (var user in userViewModels)    {
           Console.WriteLine($"Id={user.Id};Name={user.Name};City={user.City}");    }}

Profile

public class StudentProfile : Profile{
       public StudentProfile()    {
           CreateMap
   
    ();    }}

public class UserProfile : Profile{
       public UserProfile()    {
           CreateMap
   
    ()            .ForMember(                model => model.City,                expression => expression.MapFrom(user => user.Address.City))            .ForMember(                model => model.State,                expression => expression.MapFrom(user => user.Address.State))            .ForMember(                model => model.Country,                expression => expression.MapFrom(user => user.Address.Country));    }}

public class Sample04{
       public static void Run()    {
                   var config = new MapperConfiguration(cfg =>        {
               cfg.AddProfile
   
    ();            cfg.AddProfile
    
     ();        });        var mapper = config.CreateMapper();        var result = GetUsers();        var users = mapper.Map
     
      
       >(result);        Print(users);    }    public static List
       
         GetUsers()    {
           var context = new SampleContext();        return context.Users;    }    public static void Print(IList
        
          userViewModels) { foreach (var user in userViewModels) { Console.WriteLine($"Id={user.Id};Name={user.Name};City={user.City}"); } }}

AutoMapper 自定义解析

public class Customer{
       public int Id {
    get; set; }    public string FirstName {
    get; set; }    public string LastName {
    get; set; }}

public class CustomerViewModel{
       public int Id {
    get; set; }    public string FullName {
    get; set; }}

public class CustomerResolver : IValueResolver
   
    {
       public string Resolve(Customer source, CustomerViewModel destination, string destMember, ResolutionContext context)    {
           return source.FirstName + " " + source.LastName;    }}

public static void Run(){
       var config = new MapperConfiguration(cfg =>    {
           cfg.CreateMap
   
    ()            .ForMember(model => model.FullName, expression => expression.MapFrom
    
     ());    });    var mapper = config.CreateMapper();    var customer = new Customer    {
           Id = 1,        FirstName = "Klein",        LastName = "Moretti"    };    var result = mapper.Map
     
      (customer);    Console.WriteLine(result.FullName);}

AutoMapper 自定义类型转换

public class Person{
       public int Id {
    get; set; }    public string Name {
    get; set; }    public int Age {
    get; set; }}

public class PersonViewModel{
       public int Id {
    get; set; }    public string Name {
    get; set; }    public string Age {
    get; set; }}

public class StringTypeConverter : ITypeConverter
   
    {
       public string Convert(int source, string destination, ResolutionContext context)    {
           return source.ToString();    }}

public static void Run(){
       var config = new MapperConfiguration(cfg =>    {
           cfg.CreateMap
   
    ().ConvertUsing
    
     ();        cfg.CreateMap
     
      ();    });    var mapper = config.CreateMapper();    var person = new Person    {
           Id = 1,        Age = 10    };    var result = mapper.Map
      
       (person);    Console.WriteLine($"{result.Age.GetType()}:Age={result.Age})");}

AutoMapper 动态对象映射

public static void Run(){
       var config = new MapperConfiguration(cfg => {
   });    var mapper = config.CreateMapper();    var customer = new Customer    {
           Id = 1,        FirstName = "Klein",        LastName = "Moretti"    };    // 强类型对象映射到动态类型对象    var result = mapper.Map
   
    (customer);    Console.WriteLine($"result:{result.FirstName} {result.LastName}");    // 动态类型对象映射到强类型对象    customer = mapper.Map
    
     (result);    Console.WriteLine($"customer:{customer.FirstName} {customer.LastName}");    // 字典对象映射到强类型对象    var dict = new Dictionary
     
       {
   {
   "FirstName", "Klein"}, {
   "LastName", "Moretti"}};    customer = mapper.Map
      
       (dict);    Console.WriteLine($"dictToCustomer:{customer.FirstName} {customer.LastName}");}

AutoMapper在ASP.NET Core中使用

首先安装如下两个包

AutoMapperAutoMapper.Extensions.Microsoft.DependencyInjection

public class Startup{
       public Startup(IConfiguration configuration)    {
           Configuration = configuration;    }    public IConfiguration Configuration {
    get; }    public void ConfigureServices(IServiceCollection services)    {
           services.AddControllers();        services.AddSingleton
   
    ();        services.AddScoped
    
     ();        services.AddAutoMapper(Assembly.GetExecutingAssembly());        services.AddMediatR(Assembly.GetExecutingAssembly());            }    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)    {
           if (env.IsDevelopment())        {
               app.UseDeveloperExceptionPage();        }        app.UseRouting();        app.UseAuthorization();        app.UseEndpoints(endpoints =>        {
               endpoints.MapControllers();        });    }}

public class OrderProfile : Profile    {
           public OrderProfile()        {
               CreateMap
   
    ();        }    }

public class GetOrderByIdResponseModel    {
           public Guid Id {
    get; set; }        public DateTime DateOrder {
    get; set; }        public int Quantity {
    get; set; }        public double Amount {
    get; set; }        public Guid ProductId {
    get; set; }        public string ProductName {
    get; set; }    }

public class GetOrderByIdQueryHandler : IRequestHandler
   
    {
       private readonly OrderRepository _orderRepository;    private readonly IMapper _mapper;    public GetOrderByIdQueryHandler(OrderRepository orderRepository, IMapper mapper)    {
           _orderRepository = orderRepository;        _mapper = mapper;    }    public Task
    
      Handle(GetOrderByIdRequestModel request, CancellationToken cancellationToken)    {
           var order = _orderRepository.GetById(request.OrderId);        var response = _mapper.Map
     
      (order);        return Task.FromResult(response);    }}

[Route("api/[controller]")][ApiController]public class OrderController : ControllerBase{
       private readonly IMediator _mediator;    public OrderController(IMediator mediator)    {
           _mediator = mediator;    }    [HttpPost]    public IActionResult MakeOrder([FromBody] MakeOrderRequestModel requestModel)    {
           var response = _mediator.Send(requestModel).Result;        return Ok(response);    }    [HttpGet("{id}")]    public IActionResult OrderDetails(Guid id)    {
           var response = _mediator.Send(new GetOrderByIdRequestModel {
   OrderId = id}).Result;        return Ok(response);    }}

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