我有一個帶有 dBContext 名稱BookAppointmentDBContext和依賴項注冊器的 NopCommerce 插件開發DependencyRegistrar，請參閱下面的代碼片段。public class DependencyRegistrar : IDependencyRegistrar{ private const string CONTEXT_NAME ="nop_object_context_bookappointment"; public void Register(ContainerBuilder builder, ITypeFinder typeFinder, NopConfig config) { builder.RegisterType<BookAppointmentService>().As<IBookAppointmentService>().InstancePerLifetimeScope(); //data context builder.RegisterPluginDataContext<BookAppointmentDBContext>(CONTEXT_NAME); //override required repository with our custom context builder.RegisterType<EfRepository<CarInspectionModel>>() .As<IRepository<CarInspectionModel>>() .WithParameter(ResolvedParameter.ForNamed<IDbContext>(CONTEXT_NAME)) .InstancePerLifetimeScope(); } public int Order => 1;}和下面的 BookAppointmentDBContext 類public class BookAppointmentDBContext : DbContext, IDbContext{ #region Ctor public BookAppointmentDBContext(DbContextOptions<BookAppointmentDBContext> options) : base(options) { } /*the other implementation of IDbContext as found in http://docs.nopcommerce.com/display/en/Plugin+with+data+access*/}另外，我有一個 BasePluglin 類public class BookAppointmentPlugin : BasePlugin{ private IWebHelper _webHelper; private readonly BookAppointmentDBContext _context; public BookAppointmentPlugin(IWebHelper webHelper, BookAppointmentDBContext context) { _webHelper = webHelper; _context = context; } public override void Install() { _context.Install(); base.Install(); } public override void Uninstall() { _context.Uninstall(); base.Uninstall(); }}我已經BookAppointmentDBContext注冊了，但錯誤狀態相反。知道我做錯了什么嗎？
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浮云間
TA貢獻1829條經驗 獲得超4個贊
這個問題是缺少注冊的，DbContextOption它是初始化目標數據庫上下文所需的構造函數的一部分。
在內部就是這樣RegisterPluginDataContext做的。
/// <summary>
/// Represents extensions of Autofac ContainerBuilder
/// </summary>
public static class ContainerBuilderExtensions
{
? ? /// <summary>
? ? /// Register data context for a plugin
? ? /// </summary>
? ? /// <typeparam name="TContext">DB Context type</typeparam>
? ? /// <param name="builder">Builder</param>
? ? /// <param name="contextName">Context name</param>
? ? public static void RegisterPluginDataContext<TContext>(this ContainerBuilder builder, string contextName) where TContext : DbContext, IDbContext
? ? {
? ? ? ? //register named context
? ? ? ? builder.Register(context => (IDbContext)Activator.CreateInstance(typeof(TContext), new[] { context.Resolve<DbContextOptions<TContext>>() }))
? ? ? ? ? ? .Named<IDbContext>(contextName).InstancePerLifetimeScope();
? ? }
}
DbContextOptions<TContext>請注意，它在激活上下文時嘗試解析。
您需要構建數據庫上下文選項并將其提供給容器，以便在解析時可以將其注入到上下文中。
private const string CONTEXT_NAME ="nop_object_context_bookappointment";
public? void Register(ContainerBuilder builder, ITypeFinder typeFinder, NopConfig config) {
? ? //...code removed for brevity
? ? var optionsBuilder = new DbContextOptionsBuilder<BookAppointmentDBContext>();
? ? optionsBuilder.UseSqlServer(connectionStringHere);
? ? DbContextOptions<BookAppointmentDBContext> options = optionsBuilder.Options;
? ? builder.RegisterInstance<DbContextOptions<BookAppointmentDBContext>>(options);?
? ? //data context
? ? builder.RegisterPluginDataContext<BookAppointmentDBContext>(CONTEXT_NAME);
? ? //...code removed for brevity
}
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