在最新版本的asp.net core中，你应该使用以下初始化:

services.AddAutoMapper(typeof(YourMappingProfileClass));

ASP。NET Core(使用2.0+和3.0测试)，如果你喜欢阅读源文档: https://github.com/AutoMapper/AutoMapper.Extensions.Microsoft.DependencyInjection/blob/master/README.md

否则，遵循以下4个步骤即可:

从nuget安装AutoMapper.Extensions.Microsoft.DependancyInjection。 只需添加一些概要文件类。 然后将以下内容添加到你的startup.cs类中。 services.AddAutoMapper (OneOfYourProfileClassNamesHere) 然后简单地在你的控制器或任何你需要它的地方注入IMapper:

public class EmployeesController {

    private readonly IMapper _mapper;

    public EmployeesController(IMapper mapper){

        _mapper = mapper;
    }

如果你想使用ProjectTo，现在很简单:

var customers = await dbContext.Customers.ProjectTo<CustomerDto>(_mapper.ConfigurationProvider).ToListAsync()

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);

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));

使用ASP使用AutoMapper。净的核心。

步骤1。从NuGet包中安装AutoMapper.Extensions.Microsoft.DependencyInjection。

步骤2。在“解决方案”中创建一个文件夹以保存名称为“Mappings”的映射。

步骤3。添加映射文件夹后，我们添加了一个名为“MappingProfile”的类，这个名称可以是唯一的，很好理解。

在本课程中，我们将维护所有映射。

步骤4。在启动“ConfigureServices”时初始化映射器

在启动类，我们需要初始化配置文件，我们已经创建和注册AutoMapper服务。

  Mapper.Initialize(cfg => cfg.AddProfile<MappingProfile>());

  services.AddAutoMapper();

显示ConfigureServices方法的代码片段，其中我们需要初始化和注册AutoMapper。

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }


    public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });


        // Start Registering and Initializing AutoMapper

        Mapper.Initialize(cfg => cfg.AddProfile<MappingProfile>());
        services.AddAutoMapper();

        // End Registering and Initializing AutoMapper

        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

    }}

第5步。得到的输出。

为了获得映射结果，我们需要调用AutoMapper.Mapper.Map并传递正确的目的地和源。

AutoMapper.Mapper.Map<Destination>(source);

CodeSnippet

    [HttpPost]
    public void Post([FromBody] SchemeMasterViewModel schemeMaster)
    {
        if (ModelState.IsValid)
        {
            var mappedresult = AutoMapper.Mapper.Map<SchemeMaster>(schemeMaster);
        }
    }

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! } }