Question

我收到“缺少类型映射配置或不支持的映射”的一般错误。当我尝试创建此地图时。有什么想法吗？

     Mapper.CreateMap<MyEnum, MyClass>().ConvertUsing(c =>
     {
        MyAttribute attribute = c.GetCustomAttribute<MyEnum, MyAttribute>();
        return new MyClass()
        {
           Id = c.ToString(),
           Name = attribute == null ? c.ToString() : attribute.DisplayName
        };
     });

和...

  protected override void Configure()
  {
     base.Configure();

     Mapper.CreateMap<MyEnum, MyClass>()
        .ForMember(d => d.Id, opt => opt.MapFrom(s => s.ToString()))
        .ForMember(d => d.Name, opt => opt.ResolveUsing<DisplayNameResolver>());
  }

  private class DisplayNameResolver : ValueResolver<MyEnum, string>
  {
     protected override string ResolveCore(MyEnum e)
     {
        MyAttribute attribute = e.GetCustomAttribute<MyEnum, MyAttribute>();
        return attribute == null ? e.ToString() : attribute.DisplayName;
     }
  }

似乎没有用。

感谢。

Answer 1

此错误的一个症状是您未在应用程序根目录中调用Configure（）。如果您的配置存在问题，我建议您进行单元测试并调用Automapper的AssertConfigurationIsValid() - Configuration Validation Page

[TestMethod]
public void BaseMapperWorks()
{   
    //MapperConfig is my static MapperCongfiguration Class
    MapperConfig.Configure();
    Mapper.AssertConfigurationIsValid();
}

AutoMapper Validatior会为您提供映射错误的所有内容

Automapper将枚举映射到类

1 个答案: