通过标题查找Silverlight TreeViewItem控制
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22-09-2019 - |
题
我正在尝试从Silverlight Treeview控件创建树视图。我的数据是从从EF中提取的WCF服务中提取的。所有数据都很好。我可以在可以输入用户名的地方设置页面,单击一个按钮,数据将填充TreeView中的第一代。因此,我动态构建了TreeViewItems,以将每个附加的RoutedEventHandlers附加到我的树视图中。当我单击一个TreeViewItem节点之一时,它启动了TVI_Selected函数,在该功能中,我想在我刚选择的TreeViewItem下填充TreeViewItems。
当我在我的委托函数prox_getChildMemberscomplet中,我遇到了问题。我无法找到一种在TreeViewItem上进行FindControl类型查找的方法,我想将其添加到Child viewiewitem元素。因此,我认为我只会创建一个受保护的字段,因为它仅包含用户名。我只需要能够通过标题或其他暗示我的方法访问特定的TreeViewItem即可。
您可以看到在我选择的EventHandler中,我通过将发件人对象投入到TreeViewItem来获取标题信息。在“ tvi_selected”内部调用的“委托函数” prox_getChildMembersComplet中,发件人对象是wcfdataClient,因此我无法从该发件人中获取相同的数据。即使您建议一种完全不同的方法,对此的任何洞察力也将不胜感激。
<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();
}
}
}
}
解决方案
我想出了一种方法。我去并为动态生成的TreeViewItems分配了一个名称作为用户名。我还将发件人用户名存储在受保护的字符串中,然后称此代码行以获取parent treeViewItem:
TreeViewItem tviParent = (TreeViewItem)LayoutRoot.FindName(sParentID);
感谢您的答案! :)
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