wcf每次调用实例模式下的实体框架DbContext
我有一个像这样的存储库
public abstract class BaseRepository<TEntity> : IRepository<TEntity> where TEntity : class
{
protected DbContext _dbContext;
public BaseRepository(DbContext dbContext)
{
_dbContext = dbContext;
}
public TEntity GetByKey(object keyValue)
{
// todo
}
}
和一个像这样的具体存储库
public CustomerRepository : BaseRepository<Customer> , ICustomerRepository
{
public CustomerRepository(DbContext context) : base (context) { }
public Customer FindCustomerByKey(string key)
{
_dbContext.Set<Customer>().Find(key);
}
}
我有这样的 wcf 服务
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]
public class CustomerSatisfactionService : ICustomerSatisfactionService
{
private ICustomerRepository _customerRepository;
private IHelpDeskRepository _helpdeskRepository;
public AccountService(ICustomerRepository customerRepository,IHelpdeskRepository helpdeskRepository)
{
_customerRepository = customerRepository;
_helpdeskRepository = helpdeskRepository;
}
public void DoSomethingUsingBothRepositories()
{
// start unit of work
// _customerRepository.DoSomething();
// _helpdeskRepository.DoSomething();
// commit unit of work
}
}
，并且我正在使用 StructureMap对于注入这样的 DbContext 实例
For<DbContext>().Use(() => new MyApplicationContext());
我的问题是，当客户端调用服务时，会创建一个新的 CustomerSatisfactionService 实例，因此会创建 CustomerRepository 和 HelpdeskRepository 的新实例> 已创建，但使用不同的 DbContext。
我想实现工作单元模式，但在 DoSomethingWithBothRepositories 方法中，两个存储库具有不同的 DbContext。
有没有办法告诉结构图在每次调用的基础上启动 DbContext 实例？
I have a repository like this
public abstract class BaseRepository<TEntity> : IRepository<TEntity> where TEntity : class
{
protected DbContext _dbContext;
public BaseRepository(DbContext dbContext)
{
_dbContext = dbContext;
}
public TEntity GetByKey(object keyValue)
{
// todo
}
}
and a concrete repository like this
public CustomerRepository : BaseRepository<Customer> , ICustomerRepository
{
public CustomerRepository(DbContext context) : base (context) { }
public Customer FindCustomerByKey(string key)
{
_dbContext.Set<Customer>().Find(key);
}
}
I have wcf service like this
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]
public class CustomerSatisfactionService : ICustomerSatisfactionService
{
private ICustomerRepository _customerRepository;
private IHelpDeskRepository _helpdeskRepository;
public AccountService(ICustomerRepository customerRepository,IHelpdeskRepository helpdeskRepository)
{
_customerRepository = customerRepository;
_helpdeskRepository = helpdeskRepository;
}
public void DoSomethingUsingBothRepositories()
{
// start unit of work
// _customerRepository.DoSomething();
// _helpdeskRepository.DoSomething();
// commit unit of work
}
}
and I am using StructureMap for injecting DbContext instances like this
For<DbContext>().Use(() => new MyApplicationContext());
My problem is when a client calls the service, a new CustomerSatisfactionService instance is created, hence new instances of CustomerRepository and HelpdeskRepository are created but with different DbContexts.
I want to implement the unit of work pattern, but in the DoSomethingWithBothRepositories method, the two repositories have different DbContexts.
Is there any way to tell structure map to spin up a DbContext instance on a per call basis?
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评论（3）
您必须指定 DbContext 的生命周期，以便每次调用仅创建一个实例。 StructureMap 不包含针对每次调用 WCF 的内置生命周期管理，但您可以在 此博客。
You must specify lifecycle for your DbContext so that only one instance is created per call. StructureMap doesn't contain build-in lifecycle management for per call WCF but you can find one implementation on this blog.
您需要实现 UnitOfWork 模式，以便在实体之间共享相同的上下文。看一下 http://blogs.msdn.com/b/adonet/archive/2009/06/16/using-repository-and-unit-of-work-patterns-with -entity-framework-4-0.aspx 了解实现它的方法。
You need to implement UnitOfWork pattern so that same context is shared amongst entities. Take a look at http://blogs.msdn.com/b/adonet/archive/2009/06/16/using-repository-and-unit-of-work-patterns-with-entity-framework-4-0.aspx for a way to implement it.
我不知道您是否需要/想要 StructureMap 来控制 dbcontext 的实例化，请查看此回复，UoW 和 UoW Factory setup dbcontext 用于需要在存储库中进行的调用。
EF ObjectContext、服务和存储库 - 管理上下文生命周期。< /a>
I don't know if you need/want StructureMap to control the instantiation of dbcontext, have a look at this reply, UoW and UoW Factory setup dbcontext for the calls that need to be made in the repository.
EF ObjectContext, Service and Repository - Managing context lifetime.