RIA：加载实体集
在使用 SL4 RIA 实体时，我遗漏了一些非常基本的东西。 我有一个包含 User 实体的域服务。在服务上下文中，我有一个方法：
EntityQuery
我执行如下加载：
context.Load(context.GetUsersQuery(), (loadOp)=>
{
// Things done when the load is completed
}, null);
当执行 Completed 操作时，loadOp.Entities 集合充满了 User > 实体，但它们未附加到 context.Users 实体集。我似乎也无法从回调中手动附加它们。为了在实体集中跟踪这些内容，我错过了哪些重要步骤？
只是为了详细说明，在已完成的处理程序中，我尝试了：
foreach (var user in loadOp.Entities)
context.Users.Attach(user);
我收到一个异常，表示已附加具有该名称的实体。 然而，context.Users 和 context.EntityContainer 都是空的。
I am missing something very fundamental when working with SL4 RIA entities.
I have a Domain Service with User entities. On the service context, I have a method:
EntityQuery<User> GetUsersQuery()
I perform a load like so:
context.Load(context.GetUsersQuery(), (loadOp)=>
{
// Things done when the load is completed
}, null);
When the Completed action executes, the loadOp.Entities collection is full of the User entities, but they are not attached to the context.Users entity set. It also appears that I can't attach them manually from the callback. What important step am I missing to get these tracked in the entity set?
Just to elaborate, in the completed handler, I tried:
foreach (var user in loadOp.Entities)
context.Users.Attach(user);
And I get an exception that says an entity with that name is already attached.
Yet, both context.Users and context.EntityContainer are empty.
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您确定在所有情况下都使用相同的上下文实例吗？
context.EntityContainer.GetEntitySet().Count 说什么？LoadOperation.HasError 返回 true 吗？如果是这样，错误是什么？Are you sure you are using the same instance of the context in all cases? What does
context.EntityContainer.GetEntitySet<User>().Countsay?Does
LoadOperation<User>.HasErrorreturn true? If so, what is the error?