我是。net的新手,所以我决定使用。net Core,而不是学习“老方法”。我在这里找到了一篇关于为。net Core设置AutoMapper的详细文章,但是对于新手来说还有更简单的操作指南吗?
当前回答
对于自动映射器 9.0.0:
public static IEnumerable<Type> GetAutoMapperProfilesFromAllAssemblies()
{
foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
{
foreach (var aType in assembly.GetTypes())
{
if (aType.IsClass && !aType.IsAbstract && aType.IsSubclassOf(typeof(Profile)))
yield return aType;
}
}
}
MapperProfile:
public class OrganizationProfile : Profile
{
public OrganizationProfile()
{
CreateMap<Foo, FooDto>();
// Use CreateMap... Etc.. here (Profile methods are the same as configuration methods)
}
}
在你的初创公司:
services.AddAutoMapper(GetAutoMapperProfilesFromAllAssemblies()
.ToArray());
在控制器或服务中: 注入映射器:
private readonly IMapper _mapper;
用法:
var obj = _mapper.Map<TDest>(sourceObject);
其他回答
在。net 6中,你需要在Program.cs文件中添加以下内容:
builder.Services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies());
对于使用。net 7的AutoMapper 11.0.1,我开始得到这个异常:
System.ArgumentException: 'GenericArguments[0], 'System.DateTime', on 'T MaxInteger[T](System.Collections.Generic.IEnumerable`1[T])' violates the constraint of type 'T'.'
Inner Exception
VerificationException: Method System.Linq.Enumerable.MaxInteger: type argument 'System.DateTime' violates the constraint of type parameter 'T'.
看这个问题:
系统。DateTime on 'T MaxInteger[T](System.Collections.Generic.IEnumerable ' 1[T])'违反了。net 7使用AutoMapper 11.0.1的T类型约束
这意味着我不能再使用services.AddAutoMapper(typeof(MappingProfile).Assembly);无一例外。
对于AutoMapper.Extensions.Microsoft.DependencyInjection我这样解决它:
services.AddAutoMapper(cfg => cfg.Internal().MethodMappingEnabled = false, typeof(MappingProfile).Assembly);
对于Blazor WebAssembly客户端,解决方案是这样的:
var mapperConfig = new MapperConfiguration(mc =>
{
//Needed for https://github.com/AutoMapper/AutoMapper/issues/3988
mc.Internal().MethodMappingEnabled = false;
mc.AddProfile(new MappingProfile());
});
//mapperConfig.AssertConfigurationIsValid();
IMapper mapper = mapperConfig.CreateMapper();
builder.Services.AddSingleton(mapper);
我想扩展@theutz的答案-即这一行:
// services.AddAutoMapper(typeof(Startup)); // <-- newer automapper version uses this signature.
AutoMapper.Extensions.Microsoft.DependencyInjection版本3.2.0中有一个错误(可能)。(我使用的是。net Core 2.0)
这个问题在这个GitHub问题中解决。如果你继承AutoMapper的Profile类存在于你的Startup类所在的程序集之外,如果你的AutoMapper注入是这样的,它们可能不会被注册:
services.AddAutoMapper();
除非您显式指定要搜索AutoMapper概要文件的程序集。
在你的初创公司中也可以这样做。ConfigureServices:
services.AddAutoMapper(<assembies> or <type_in_assemblies>);
其中"assemblies"和"type_in_assemblies"指向应用程序中指定Profile类的程序集。例句:
services.AddAutoMapper(typeof(ProfileInOtherAssembly), typeof(ProfileInYetAnotherAssembly));
我认为(我强调这个词)由于以下无参数重载的实现(来自GitHub的源代码):
public static IServiceCollection AddAutoMapper(this IServiceCollection services)
{
return services.AddAutoMapper(null, AppDomain.CurrentDomain.GetAssemblies());
}
我们依赖于CLR已经包含AutoMapper配置文件的JITed程序集,这可能是真的,也可能不是真的,因为它们只在需要时被jit(更多细节在这个StackOverflow问题中)。
Asp。Net Core 2.2与AutoMapper.Extensions.Microsoft.DependencyInjection。
public class MappingProfile : Profile
{
public MappingProfile()
{
CreateMap<Domain, DomainDto>();
}
}
在Startup.cs
services.AddAutoMapper(typeof(List.Handler));
我想明白了!细节如下:
Add the main AutoMapper Package to your solution via NuGet. Add the AutoMapper Dependency Injection Package to your solution via NuGet. Create a new class for a mapping profile. (I made a class in the main solution directory called MappingProfile.cs and add the following code.) I'll use a User and UserDto object as an example. public class MappingProfile : Profile { public MappingProfile() { // Add as many of these lines as you need to map your objects CreateMap<User, UserDto>(); CreateMap<UserDto, User>(); } } Then add the AutoMapperConfiguration in the Startup.cs as shown below: public void ConfigureServices(IServiceCollection services) { // .... Ignore code before this // Auto Mapper Configurations var mapperConfig = new MapperConfiguration(mc => { mc.AddProfile(new MappingProfile()); }); IMapper mapper = mapperConfig.CreateMapper(); services.AddSingleton(mapper); services.AddMvc(); } To invoke the mapped object in code, do something like the following: public class UserController : Controller { // Create a field to store the mapper object private readonly IMapper _mapper; // Assign the object in the constructor for dependency injection public UserController(IMapper mapper) { _mapper = mapper; } public async Task<IActionResult> Edit(string id) { // Instantiate source object // (Get it from the database or whatever your code calls for) var user = await _context.Users .SingleOrDefaultAsync(u => u.Id == id); // Instantiate the mapped data transfer object // using the mapper you stored in the private field. // The type of the source object is the first type argument // and the type of the destination is the second. // Pass the source object you just instantiated above // as the argument to the _mapper.Map<>() method. var model = _mapper.Map<UserDto>(user); // .... Do whatever you want after that! } }
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