映射器不支持的映射

Question

我在使用 Automapper 时遇到困难，希望您能提供帮助。我正在尝试从 DailyCourses 映射到 DailyCoursesSearch，但我一直遇到异常。我知道映射存在一些问题，但我已尝试切换对象位置，确保所有 tzpe 都是相同的 treid 以从成员映射到成员但没有成功。它确实适用于另一个类.

这是我的错误

Missing type map configuration or unsupported mapping.
Mapping types:
Object -> DailyCourseSearch
System.Object -> Core.Contracts.Models.DailyCourseSearch

这些都是类提到的

public class DailyCourses
{
  public DateTimeOffset? CourseDate { get; set; }
            
  public IEnumerable<DailyCourse> Items { get; set; }
}
            
  public class DailyCoursesSearch
 {
    public DateTimeOffset? CourseDate { get; set; }
            
    public IEnumerable<DailyCourseSearch> Items { get; set; }
 }
            
 public class DailyCourseSearch
 {
   public string CountryName { get; set; } = null!;
            
   public string CurrencyName { get; set; } = null!;
            
   public string Amount { get; set; }
            
   public string CountryCode { get; set; } = null!;
            
   public string Course { get; set; }
   }

  public class DailyCourse
    {
        [Required]
        public string CountryName { get; set; } = null!;

        [Required]
        public string CurrencyName { get; set; } = null!;

        //TODO to short
        [Required]
        public string Amount { get; set; }

        /// <summary>
        /// ISO 3-letter code
        /// </summary>
        [Required]
        public string CountryCode { get; set; } = null!;

        //TODO to double
        [Required]
    public string Course { get; set; }
    }
        
        
 public class MapperTest
 {
  [Test]
  public void Mapping()
  {
     var dailyCourses = new DailyCourses();
     dailyCourses.Items = new List<DailyCourse>()
     {
       new DailyCourse()
       {
            Amount = "TEst"
        }
       };
        
         var config = new MapperConfiguration(cfg =>
        {
            cfg.CreateMap<DailyCourses, DailyCoursesSearch>().ForMember(a => a.Items, o => o.MapFrom(y => y.Items));
            cfg.CreateMap<DailyCourse, DailyCourseSearch>();
        });
                var mapper = new Mapper(config);
        
        
           mapper.Map<DailyCourseSearch>(dailyCourses);
          }
      }
    
     public void ConfigureServices(IServiceCollection services)
     {
        services.AddAutoMapper(typeof(Startup).Assembly);
     }

Answer 1

您的代码中存在一个很难发现的错误，并且刚刚在编写完整的 running example

时发现了它

using System;
using System.Collections.Generic;
using System.Text.Json;
using AutoMapper;

public static class Program
{
    public static void Main()
    {
        var dailyCourses = new DailyCourses();
        dailyCourses.Items = new List<DailyCourse>()
        {
            new DailyCourse { Amount = "Test" }
        };

        var config = new MapperConfiguration(cfg =>
        {
            cfg.CreateMap<DailyCourse, DailyCourseSearch>();
            cfg.CreateMap<DailyCourses, DailyCoursesSearch>()
                .ForMember(a => a.Items, o => o.MapFrom(y => y.Items));
        });

        var mapper = new Mapper(config);
        
        var search = mapper.Map<DailyCoursesSearch>(dailyCourses);
        var json = JsonSerializer.Serialize(search);
        
        Console.WriteLine(json);
    }
}

public class DailyCourses
{
    public DateTimeOffset? CurseDate { get; set; }

    public IEnumerable<DailyCourse> Items { get; set; }
}

public class DailyCoursesSearch
{
    public DateTimeOffset? CurseDate { get; set; }

    public IEnumerable<DailyCourseSearch> Items { get; set; }
}

public class DailyCourseSearch
{
    public string CountryName { get; set; }
    public string CurrencyName { get; set; }
    public string Amount { get; set; }

    public string CountryCode { get; set; }
    public string Course { get; set; }
}

public class DailyCourse
{
    public string CountryName { get; set; }
    public string CurrencyName { get; set; } 
    public string Amount { get; set; }

    public string CountryCode { get; set; }
    public string Course { get; set; }
}

您的代码中的错误是这一行：

mapper.Map<DailyCourseSearch>(dailyCourses);

应该是这段代码可以工作：

mapper.Map<DailyCoursesSearch>(dailyCourses);

所以原因是你的代码中有一个简单的拼写错误，应该关闭这个问题。

映射器不支持的映射

Mapper unsupported mapping

c#

automapper