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我想從Silverlight TreeView控件創建一個TreeView。我的數據是從EF提取的WCF服務中提取的。所有的數據都沒有問題。我可以在頁面上設置我可以輸入用戶名的位置，單擊按鈕，數據將填充TreeView中的第一代。所以，我動態地構建了TreeViewItems，並將其放入我的TreeView中，並在每個TreeView上連接了一個Selected RoutedEventHandlers。當我點擊其中一個TreeViewItem節點時，它啓動了我想在我剛剛選擇的TreeViewItem下填充TreeViewItems的tvi_Selected函數。通過標題查找Silverlight TreeViewItem控件
我在我的委託函數prox_GetChildMembersCompleted中遇到問題。我無法找到一種方法來對我想要添加子TreeViewItem元素的TreeViewItem執行FindControl類型查找。所以，我認爲我只是創建一個受保護的字段，在那裏我將Header信息存儲到它，因爲它只包含UserName。我只需要能夠通過Header或其他暗示我的方法來訪問特定的TreeViewItem。
你可以看到，在我選擇的事件處理程序中，我通過將發件人對象強制轉換爲TreeViewItem來獲取標題信息。在tvi_Selected內部調用的委託函數prox_GetChildMembersCompleted中，發件人對象是WCFDataClient，因此我無法從該發件人獲取相同的數據。即使你提出了一種完全不同的方法，任何對此的見解都會得到很大的讚賞。
<UserControl xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"
x:Class="FloLOS2.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">
<Grid x:Name="LayoutRoot" Background="#5C7590">
<StackPanel>
<TextBox x:Name="txtUserName" Width="120" Margin="5"></TextBox>
<TextBlock x:Name="txtFillBlock" Width="300" Margin="5" Foreground="White" Text="Change me"></TextBlock>
<Button x:Name="btnSubmit" Margin="5" Content="Get Frontline" Width="120" Click="btnSubmit_Click" />
<data:DataGrid x:Name="MembersGrid" Margin="5"></data:DataGrid>
<controls:TreeView x:Name="MembersTree" Margin="5"></controls:TreeView>
</StackPanel>
</Grid>
</UserControl>
namespace FloLOS2
{
public partial class MainPage : UserControl
{
string sParentID;
public MainPage()
{
InitializeComponent();
}
private void btnSubmit_Click(object sender, RoutedEventArgs e)
{
GetMyDataRef.GetMyDataClient prox = new FloLOS2.GetMyDataRef.GetMyDataClient();
prox.GetMembersCompleted += new EventHandler<FloLOS2.GetMyDataRef.GetMembersCompletedEventArgs>(prox_GetMembersCompleted);
prox.GetMembersAsync(txtUserName.Text);
}
void prox_GetMembersCompleted(object sender, FloLOS2.GetMyDataRef.GetMembersCompletedEventArgs e)
{
GetMyDataRef.Member[] members = e.Result.ToArray();
foreach (var x in members)
{
TreeViewItem tvi = new TreeViewItem() { Header = x.UserName };
tvi.Selected += new RoutedEventHandler(tvi_Selected);
MembersTree.Items.Add(tvi);
}
//MembersTree.Items.Add(tvi);
}
void prox_GetChildMembersCompleted(object sender, FloLOS2.GetMyDataRef.GetMembersCompletedEventArgs e)
{
GetMyDataRef.Member[] members = e.Result.ToArray();
TreeViewItem tviParent = new TreeViewItem();
// *** Find TreeViewItem control based on Header ***
foreach (var x in members)
{
TreeViewItem tviChild = new TreeViewItem() { Header = x.UserName };
tviChild.Selected += new RoutedEventHandler(tvi_Selected);
tviParent.Items.Add(tviChild);
}
}
void tvi_Selected(object sender, RoutedEventArgs e)
{
try
{
TreeViewItem item = (TreeViewItem)sender;
txtFillBlock.Text = item.Header.ToString();
sParentID = item.Header.ToString();
GetMyDataRef.GetMyDataClient prox = new FloLOS2.GetMyDataRef.GetMyDataClient();
prox.GetMembersCompleted += new EventHandler<FloLOS2.GetMyDataRef.GetMembersCompletedEventArgs>(prox_GetChildMembersCompleted);
prox.GetMembersAsync(item.Header.ToString());
}
catch (Exception ex)
{
txtFillBlock.Text = ex.InnerException.ToString();
}
}
}
}