c# - ASP.NET Core 集成测试 UseLazyLoadingProxies 需要在使用的内部服务提供者上调用 AddEntityFrameworkProxies

Question

我正在构建 Web 服务并尝试实现一些集成测试，但在运行测试时我看到以下错误；

UseLazyLoadingProxies requires AddEntityFrameworkProxies to be called on the internal service provider used.

谷歌没有为这个错误提供任何有用的结果，我不知道如何解决它。我已尝试将 services.AddEntityFrameworkProxies() 添加到我的 Startup.cs 文件和我的测试项目中的 CustomWebApplicationFactory.cs 文件。都没有解决问题。

这是 IntegrationTests 项目中我的 CustomWebApplicationaFactory.cs 文件；

public class CustomWebApplicationFactory<TStartup> : WebApplicationFactory<Startup>
    {
        protected override void ConfigureWebHost(IWebHostBuilder builder)
        {   
            builder.ConfigureServices(services =>
            {
                // Create a new service provider.
                var serviceProvider = new ServiceCollection()
                    .AddEntityFrameworkInMemoryDatabase()
                    .BuildServiceProvider();

                // Add a database context (AppDbContext) using an in-memory database for testing.
                services.AddDbContext<ApplicationDbContext>(options =>
                {
                    options.UseLazyLoadingProxies();
                    options.UseInMemoryDatabase("InMemoryAppDb");
                    options.UseInternalServiceProvider(serviceProvider);
                });

                // Add a database context (AppDbContext) using an in-memory database for testing.
                services.AddDbContext<MultiTenantDbContext>(options =>
                {
                    options.UseLazyLoadingProxies();
                    options.UseInMemoryDatabase("MultiTenantInMemoryAppDb");
                    options.UseInternalServiceProvider(serviceProvider);
                });

                // Build the service provider.
                var sp = services.BuildServiceProvider();

                // Create a scope to obtain a reference to the database contexts
                using (var scope = sp.CreateScope())
                {
                    var scopedServices = scope.ServiceProvider;
                    var appDb = scopedServices.GetRequiredService<ApplicationDbContext>();

                    var logger = scopedServices.GetRequiredService<ILogger<CustomWebApplicationFactory<TStartup>>>();

                    // Ensure the database is created.
                    appDb.Database.EnsureCreated();

                    try
                    {
                        // Seed the database with some specific test data.
                        SeedData.PopulateTestData(appDb);
                    }
                    catch (Exception ex)
                    {
                        logger.LogError(ex, "An error occurred seeding the " +
                                            "database with test messages. Error: {ex.Message}");
                    }
                }
            });
        }
    }

Answer 1

我按照错误告诉我的方式解决了这个问题。我向服务提供者添加了 AddEntityFrameworkProxies()；

// Create a new service provider.
                var serviceProvider = new ServiceCollection()
                    .AddEntityFrameworkInMemoryDatabase()
                    .AddEntityFrameworkProxies()
                    .BuildServiceProvider();