麻烦结合LongListSelector.SelectedItem到MVVM财产 [英] Trouble binding LongListSelector.SelectedItem to MVVM property

问题描述

使用Visual Studio 2013和窗口Phone 8的SDK，我不能得到的 LongListSelector 正确的的SelectedItem 属性绑定到MVVM属性

这似乎是一个相同的问题，在其列入在SDK而是作为固定该标记之前该控制存在的错误。 http://silverlight.codeplex.com/workitem/9360

是任何人都经历了这一点，知道一个修复/更新的版本？

我目前使用的背后解决办法

 私人无效代码LongListSelector_SelectionChanged （对象发件人，SelectionChangedEventArgs E）
 {
 LongListSelector S =发件人为LongListSelector; 
 VAR VM =的DataContext作为ViewModel.MainViewModel; 
 Debug.Assert的（VM！= NULL）; 
 
 vm.SelectedLegislator = s.SelectedItem; 
} 
  

解决方案

要获取这是该项目选定的视图模型，我总是用LongListSelector扩展 - 该代码可以在这里找到： https：//开头gist.github.com/Depechie/7524630

您需要做的是将它添加到您的LongListSelector的XAML：

 <电话：LongListSelector X：名称=列表EXT：LongListSelectorExtension.Command ={结合* YOURVIEWMODELCOMMAND *}/> 
  

在视图模型的命令将收到一份关于LongListSelector您的项目源的对象类型

Using Visual Studio 2013 and the Window Phone 8 SDK I cannot get the SelectedItem property of the LongListSelector to properly bind to an MVVM property.

It appears to be an identical issue to a bug that existed in the control prior to its inclusion in the SDK but which is marked as fixed. http://silverlight.codeplex.com/workitem/9360

Is anyone else experiencing this and know of a fix/updated version?

I am currently using a code behind workaround

    private void LongListSelector_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        LongListSelector s = sender as LongListSelector;
        var vm = DataContext as ViewModel.MainViewModel;
        Debug.Assert(vm != null);

        vm.SelectedLegislator = s.SelectedItem;   
    }

解决方案

To get the item that was selected to the ViewModel, I'm always using a LongListSelector Extension - the code can be found here: https://gist.github.com/Depechie/7524630

What you need to do is add it to the XAML of your LongListSelector:

<phone:LongListSelector x:Name="List" ext:LongListSelectorExtension.Command="{Binding *YOURVIEWMODELCOMMAND*}" />

The command on the viewmodel will receive the object type of your item source on the LongListSelector

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