我正在嘗試向服務注入一些存盤庫，向控制器注入一些服務，但我使用的 DbContext 是一個程式集，它不是啟動專案，但奇怪的是，當我嘗試呼叫創建遷移時，它告訴我這種設計是不允許的但是如果我呼叫 EnsureCreated() 方法，它允許我創建資料庫......可能會發生什么
錯誤 Microsoft.EntityFrameworkCore.Design.OperationException：無法創建“AppDbContext”型別的物件。有關設計時支持的不同模式，請參閱https://go.microsoft.com/fwlink/?linkid=851728
---> System.InvalidOperationException: Unable to resolve service for type 'Microsoft.EntityFrameworkCore.DbContextOptions 1[Repository.AppDbContext.AppDbContext]' while attempting to activate 'Repository.AppDbContext.AppDbContext'. at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.ConstructorMatcher.CreateInstance(IServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.CreateInstance(IServiceProvider provider, Type instanceType, Object[] parameters) at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetServiceOrCreateInstance(IServiceProvider provider, Type type) at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.<>c__DisplayClass13_4.<FindContextTypes>b__13() --- End of inner exception stack trace --- at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.<>c__DisplayClass13_4.<FindContextTypes>b__13() at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(Func1 factory) Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(String contextType) 在 Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.AddMigration(String name, String outputDir, String contextType, String namespace) 在 Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigrationImpl
這是服務 DI
public void ConfigureServices(IServiceCollection services)
{
services.AddDbContextPool<AppDbContext>(options =>
{
options.UseSqlServer(Configuration.GetConnectionString("ManagementServiceDb"));
});
services.AddIdentity<ApplicationUser, IdentityRole>(options => {
options.SignIn.RequireConfirmedAccount = false;
options.User.RequireUniqueEmail = true;
}).AddEntityFrameworkStores<AppDbContext>();
services.AddScoped<IRepository<Producto>, ProductoRepositorio>();
services.AddScoped<IRepository<RegistroActividad>, RegistroActividadRepositorio>();
services.AddScoped<IRepository<ProductoRegistroActividad>, RegistroActividadesProductoRepositorio>();
services.AddScoped<IRepository<TipoActividad>, TipoActividadRepositorio>();
services.AddScoped<IRepository<ApplicationUser>, UsuarioRepositorio>();
services.AddScoped<UnidadRepositorio>();
services.AddScoped<ProductosServicios>();
services.AddScoped<UsuarioServicio>();
services.AddScoped<UnidadServicios>();
services.AddControllersWithViews();
}
uj5u.com熱心網友回復：
嘗試在 DbContext 類中添加無引數建構式。
如果這不起作用，您可能需要按照此處所述添加設計時工廠。
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標籤：asp.net 核心 实体框架核心 asp.net-core-mvc asp.net-core-webapi