Windows Phone 7的：列表框SelectionChanged事件 [英] Windows Phone 7: ListBox SelectionChanged event

问题描述

我是新来的XAML和Windows Phone 7 SDK。我开发一个Windows Phone 7的应用程序，我不知道如何从ListBox中检测到选定的项目。我使用的全景模板，这里是我的代码：

I'm new to XAML and Windows Phone 7 SDK. I'm developing an Windows Phone 7 application and I don't know how to detect selected item from the ListBox. I'm using panorama template, here is my code:

<controls:PanoramaItem Header="Basic">
   <ListBox Margin="0,0,-12,0" Name="MyListBox" SelectionChanged="Elementary_SelectionChanged">
      <ListBox.ItemTemplate>
         <DataTemplate>
            <StackPanel Orientation="Horizontal" Margin="0,0,0,17">
               <Image Height="100" Width="100" Source="{Binding LevelPassedImage}" Margin="12,0,9,0"/>
               <StackPanel Width="311">
                  <TextBlock Name="lvlName" x:Uid="Elementary{Binding LevelId}" Text="{Binding LevelName}" TextWrapping="Wrap" Style="{StaticResource PhoneTextExtraLargeStyle}" />
                  <TextBlock Text="{Binding LevelPassed}" TextWrapping="Wrap" Margin="12,-6,12,0" Style="{StaticResource PhoneTextSubtleStyle}" />
               </StackPanel>
            </StackPanel>
         </DataTemplate>
      </ListBox.ItemTemplate>
   </ListBox>
</controls:PanoramaItem>

和C＃代码：

MessageBox.Show(Elementary.SelectedItem.ToString()); //returns "LocalXmlParsing.XMLParser"

我使用XMLParser的，应用程序初始化代码：

I'm using XMLParser, app initialization code:

var parser = LocalXmlParsing.XMLParser.Instance;

StreamResourceInfo strm = Application.GetResourceStream(new Uri("Levels/ElementaryLevels.xml", UriKind.Relative));
StreamReader reader = new StreamReader(strm.Stream);
string data = reader.ReadToEnd();
parser.DataToParse = data;
parser.ParseStateData();
MyListBox.ItemsSource = parser.LevelCollection;

当我试图检测的SelectedItem ，列表框返回我这个字符串：LocalXmlParsing.XMLParser

When I'm trying to detect SelectedItem, ListBox returns me this string: "LocalXmlParsing.XMLParser".

推荐答案

看起来你正在使用的诺基亚的示例项目称为LocalXmlParsing。您仍然可以使用你的代码，但如果要检测的SelectedItem 你应该使用这样的：

It looks like you are using Nokia's Sample project called "LocalXmlParsing". You can still use your code, but if you want to detect SelectedItem you should use something like this:

LocalXmlParsing.Level selecteditem = (LocalXmlParsing.Level)myListBox.SelectedItem; //it will returns your element
MessageBox.Show(selecteditem.Id); //It will return the Id of SelectedItem (String). You should use yours: SelectedItem.MyElement

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