我正在尝试从 Silverlight TreeView 控件创建一个 TreeView。我的数据是从从 EF 中提取的 WCF 服务中提取的。所有的数据都很好。我设置了可以输入用户名的页面,单击一个按钮,数据将填充到 TreeView 中的第一代。因此,我正在动态构建 TreeViewItems 以放入我的 TreeView 中,并附加一个 Selected RoutedEventHandlers。当我单击其中一个 TreeViewItem 节点时,它会启动 tvi_Selected 函数,我想在其中填充刚刚选择的 TreeViewItem 下的 TreeViewItems。
在我的委托函数 prox_GetChildMembersCompleted 中遇到问题。我想不出一种方法来对要添加子 TreeViewItem 元素的 TreeViewItem 进行 FindControl 类型查找。所以,我想我会创建一个受保护的字段,我将在其中存储 Header 信息,因为它只包含 UserName。我只需要能够通过 Header 或其他暗示我的方法访问特定的 TreeViewItem。
您可以在我的 Selected 事件处理程序中看到,我通过将 sender 对象转换为 TreeViewItem 来获取 Header 信息。在 tvi_Selected 内部调用的委托函数 prox_GetChildMembersCompleted 中,发送方对象是 WCFDataClient,因此我无法从该发送方获取相同的数据。即使您建议一种完全不同的方法,对此的任何见解都将不胜感激。
<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();
}
}
}
}