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将ItemsSource绑定到“代理”集合。如何获取DataContext?

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We've got a Silverlight application with several listboxes and comboboxes that display data sorted incorrectly, which I need to fix. Most of their ItemSource properties are set through XAML. Their DataContext may not be set directly on the control, and instead were set on a parent. So I can't easily slap an "OrderBy" on the ItemSource or DataContext assignment in the code behind, since that assignment may not explicitly exist.We've got a Silverlight application with severa




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