具有参数的AutoMapper依赖项注入

本文介绍了具有参数的AutoMapper依赖项注入的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

错误:AutoMapperConfiguration没有无参数的构造函数

Error: No parameterless constructor for AutoMapperConfiguration

我正在使用nuget包 automapper DI

I am using the nuget package automapper DI

public class AutoMapperConfiguration : Profile { private readonly ICloudStorage _cloudStorage; public AutoMapperConfiguration(ICloudStorage cloudStorage) { _cloudStorage = cloudStorage; // Do mapping here } } public void ConfigureServices(IServiceCollection services) { services.AddSingleton<ICloudStorage, AzureStorage>(); services.AddAutoMapper(); // Errors here }

如何将自动映射器DI与参数一起使用?

How do I use the automapper DI with parameters?

推荐答案

我认为您无法将DI参数添加到Profile.这种情况背后的部分逻辑可能是这些实例仅实例化一次，因此通过AddTransient注册的服务将无法达到预期的行为.

I don't think you are able to add DI parameters to Profiles. Part of the logic behind this may be that these are only instantianted once, so services registered through AddTransient would not behave as expected.

一种选择是将其注入ITypeConverter:

public class AutoMapperConfiguration : Profile { public AutoMapperConfiguration() { CreateMap<SourceModel, DestinationModel>().ConvertUsing<ExampleConverter>(); } } public class ExampleConverter : ITypeConverter<SourceModel, DestinationModel> { private readonly ICloudStorage _storage; public ExampleCoverter(ICloudStorage storage) { // injected here _storage = storage; } public DestinationModel Convert(SourceModel source, DestinationModel destination, ResolutionContext context) { // do conversion stuff return new DestinationModel(); } } public void ConfigureServices(IServiceCollection services) { services.AddSingleton<ICloudStorage, AzureStorage>(); services.AddAutoMapper(); }