c# - ASP.NET Core 2.1 无法识别配置扩展

Question

我正在尝试设置我的项目，但我总是收到此错误:

Cannot convert lambda to type 'ServiceLifetime' because it is not a delegate type.

在我的启动类(class)中，我做了:

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

public IConfiguration Configuration { get; }

还有

public void ConfigureServices(IServiceCollection services)
{
     services.AddDbContext<ServiceProvider>(options => options.UseSqlServer(Configuration.GetConnectionString("ConnectionStrings")));
}

我什至尝试安装包 Microsoft.Extensions.Configuration; 但仍然遇到相同的错误!

Answer 1

问题是您正在使用 ServiceProvider作为您的DbContextType在services.AddDbContext<TContext> 。替换services.AddDbContext<ServiceProvider>与 services.AddDbContext<YourDbContext>如下:

public void ConfigureServices(IServiceCollection services)
{
    services.AddDbContext<YourDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("ConnectionStrings")));
}