The service ‘xxx’ configured for WCF is not registered with the Autofac container

最近在使用autofac.wcf时，报如下异常：

Exception Details: System.InvalidOperationException: The service 'xxx' configured for WCF is not registered with the Autofac container.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

原：

public static class Initializer
{
public static void Initialize()
{
RegisterTypes();
Bootstrapper.With.AutoMapper().Start();
}

static void RegisterTypes()
{
ContainerBuilder builder = new ContainerBuilder();

builder.RegisterType<UnitOfWork>();
builder.RegisterType<PermissionDbContext>().As<IDbContext>();
builder.RegisterType<PermissionService>().As<IPermissionService>();
builder.RegisterType<UnitOfWork>().As<IUnitOfWork>();
AutofacHostFactory.Container = builder.Build();
}
}

改：

public static class Initializer
{
public static void Initialize()
{
RegisterTypes();
Bootstrapper.With.AutoMapper().Start();
}

static void RegisterTypes()
{
ContainerBuilder builder = new ContainerBuilder();
builder.RegisterAssemblyTypes(Assembly.GetExecutingAssembly());
builder.RegisterType<UnitOfWork>();
builder.RegisterType<PermissionDbContext>().As<IDbContext>();
builder.RegisterType<PermissionService>().As<IPermissionService>();
builder.RegisterType<UnitOfWork>().As<IUnitOfWork>();
AutofacHostFactory.Container = builder.Build();
}
}