反馈异步加载数据时 [英] Feedback when loading data asynchronously

问题描述

我有一个组合框的的ItemsSource绑定到有IsAsynchronous属性设置为true的ObjectDataProvider。里面加载数据的方法，我把等待10秒，以模拟一个较长的加载时间这个数据。

I have a ComboBox whose ItemsSource is bound to an ObjectDataProvider that has its IsAsynchronous property set to true. Inside the method that loads the data , I put a Wait for 10 seconds, to simulate a long loading time for this data.

异步加载的伟大工程 - 整个窗口仍然响应，并在10秒后，我看到的组合框下拉列表填充

The Asynchronous loading works great - the entire window is still responsive, and after 10 seconds I see the ComboBox dropdown populated.

我想提醒，这种特定的组合框加载数据，期间有10秒钟的等待时间的用户。喜欢的东西在控制的背景进度，已启用只有当某种'isLoading财产或任何设置为true。是否有可能做到这一点？

I would like to alert the user that this specific ComboBox is loading data, during that 10 second wait time. Something like a progressBar in the background of the control, that is enabled only while a certain 'isLoading' property or whatever is set to true. Is it possible to accomplish this?

感谢。

推荐答案

这看起来像优先绑定可能是您的解决方案

this looks like the Priority Binding could be a solution for you

<ListBox>
    <ListBox.ItemsSource>
    <PriorityBinding>
        <!-- highest priority sources are first in the list -->
        <Binding Path="LongLoadingCollection" IsAsync="True" />
        <!-- this contains only one item like "loading data..." -->
        <Binding Path="LoadMessage" IsAsync="True" />
    </PriorityBinding>
    </ListBox.ItemsSource>
</ListBox>

这里是一个很好的教程为优先绑定
HTTP：//www.switchonthe$c$c.com/tutorials / WPF的教程优先级的绑定

here is an good tutorial for Priority Bindings
http://www.switchonthecode.com/tutorials/wpf-tutorial-priority-bindings

或者看看MSDN
的http://msdn.microsoft.com/en-us/library/system.windows.data.prioritybinding.aspx

or take a look at msdn
http://msdn.microsoft.com/en-us/library/system.windows.data.prioritybinding.aspx

希望这有助于

这篇关于反馈异步加载数据时的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！