无法通过数据上下文进行 foreach [英] Cannot foreach through data context

问题描述

我想通过 2 个信息进行比较，一个是用户输入，第二个是数据库中的管理员 ID.在我的项目中，我使用的是 WCF Ria.我确实创建了一个自动生成的域服务类，并且在 tblAdmin 中检索所有内容的代码是自动生成的.我以这种方式加载数据::

i want to compare through 2 information, one is user input and second is admin ID in database. in my project, i'm using WCF Ria. i did created one auto-generated Domain Service Class and the code to retrieve everything in tblAdmin was auto-generated. i load the data in this way ::

        var context = new OrganizationContext();
        var x = context.tblAdmins;
        context.Load(context.GetTblAdminsQuery());
        cb1.ItemsSource = x;

它可以以这种方式加载，但我无法通过此方式获取 x.adminID.所以我试过这个 ::

it can load in this way, but i cannot get the x.adminID with this. so i tried this ::

        foreach (var admin in x)
        {
            cb1.Items.Add(admin.adminID);
        }

但是失败了...我是否知道可以在没有 foreach 的情况下挖掘数据，或者我的代码有问题吗??

but failed... may i know is that possible to dig through the data without foreach or is there something wrong in my code ??

推荐答案

看起来问题是 context.Load 调用是异步的 - 要获得结果，您需要传递回调并在那里获取数据:

Looks like the problem is that the context.Load call is asynchronous - to get the result you need to pass a callback and get your data there:

context.Load(context.GetTblAdminsQuery(), LoadCompleted, null);

和:

public void LoadCompleted(LoadOperation<YOUR_ENTITY_TYPE> op)
{
    foreach(var item in op.Entities)
    {
        //item is your entity, you can get item.adminID
    }
}

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