当运行以下命令添加数据库迁移脚本时,出现以下错误:
dotnet ef migrations add InitialCreate -v -o .\Migrations\ --context MyContext
访问 Microsoft.Extensions.Hosting 服务时出错。在没有应用程序服务提供商的情况下继续。错误:未注册类型“Microsoft.Extensions.DependencyInjection.IServiceProviderFactory`1[Autofac.ContainerBuilder]”的服务。
我已关注this https://autofaccn.readthedocs.io/en/latest/integration/aspnetcore.html#asp-net-core-3-0-and-generic-hosting文档。这Startup
类的实现如下:
public class Startup
{
public Startup(IConfiguration configuration, IHostingEnvironment env)
{
Configuration = configuration;
WebHostingEnvironment = env;
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
.AddEnvironmentVariables();
this.Configuration = builder.Build();
}
public void ConfigureServices(IServiceCollection services)
{
services
.AddMvc(options => options.EnableEndpointRouting = false)
.SetCompatibilityVersion(CompatibilityVersion.Version_3_0);
services.AddCustomDbContext(Configuration);
services.AddOptions();
}
public void ConfigureContainer(ContainerBuilder builder)
{ }
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
app.UseDeveloperExceptionPage();
app.UseHttpsRedirection();
app.UseMvc();
ConfigureEventBus(app);
}
}
有什么想法导致错误的原因以及如何修复它吗?
版本:
<TargetFramework>netcoreapp3.1</TargetFramework>
<PackageReference Include="Autofac" Version="4.9.4" />
<PackageReference Include="Autofac.Extensions.DependencyInjection" Version="5.0.1" />
您必须在 Program.cs 中配置 Autofac:
var hostBuilder = new WebHostBuilder()
.UseContentRoot(Path.GetDirectoryName(path))
.ConfigureServices(services => services.AddAutofac())
.ConfigureAppConfiguration(cb =>
{
cb.AddJsonFile("appsettings.json", optional: false).AddEnvironmentVariables();
}).UseStartup<Startup>();
or
return Host.CreateDefaultBuilder(args)
.UseServiceProviderFactory(new AutofacServiceProviderFactory())
.ConfigureAppConfiguration((builderContext, config) =>
{
config.AddJsonFile("appsettings.json", optional: true);
})
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
});
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