C# Telerik RadTreeview使用代码选择项目
我们在应用程序中使用telerik RadTreeview。我们在代码中使用MVVM模式 长话短说,我需要在我的树状视图中选择一个特定的项目,展开它,然后将该项目滚动到我的视图中。我在viewmodel中设置SelectedReportRoot 我按照下面链接中显示的示例创建了自己的扩展radtreeview 我的问题是性能。这不好。我做了调试,发现找到一个项目需要很多时间,事实上我的IE挂断了。谁能告诉我如何解决这个问题,或者给我一些有用的资源C# Telerik RadTreeview使用代码选择项目,c#,silverlight,radtreeview,C#,Silverlight,Radtreeview,我们在应用程序中使用telerik RadTreeview。我们在代码中使用MVVM模式 长话短说,我需要在我的树状视图中选择一个特定的项目,展开它,然后将该项目滚动到我的视图中。我在viewmodel中设置SelectedReportRoot 我按照下面链接中显示的示例创建了自己的扩展radtreeview 我的问题是性能。这不好。我做了调试,发现找到一个项目需要很多时间,事实上我的IE挂断了。谁能告诉我如何解决这个问题,或者给我一些有用的资源 public class Selectabl
public class SelectableRadTreeViewExtended : RadTreeView
{
public SelectableRadTreeViewExtended()
: base()
{
this.SelectionChanged += SelectableRadTreeViewExtended_SelectionChanged;
}
void SelectableRadTreeViewExtended_SelectionChanged(object sender, Telerik.Windows.Controls.SelectionChangedEventArgs e)
{
this.SelectedItem = e.AddedItems[0];
if (SelectedItem != null)
{
this.CustomSelectedItem = this.SelectedItem;
}
}
public object CustomSelectedItem
{
get { return (object)GetValue(CustomSelectedItemProperty); }
set { SetValue(CustomSelectedItemProperty, value); }
}
public static readonly DependencyProperty CustomSelectedItemProperty = DependencyProperty.Register("CustomSelectedItem", typeof(object), typeof(SelectableRadTreeViewExtended), new PropertyMetadata(OnCustomSelectionItemChanged));
private static void OnCustomSelectionItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var obj = d as SelectableRadTreeViewExtended;
if (e.NewValue != null)
{
RadTreeViewItem tvi = obj.FindItemNode(e.NewValue);
if (tvi != null)
{
tvi.IsSelected = true;
obj.GetScrollHost().ScrollIntoView(tvi);
obj.UpdateLayout();
}
}
}
public RadTreeViewItem FindItemNode(object item)
{
RadTreeViewItem node = null;
foreach (object data in this.Items)
{
node = this.ItemContainerGenerator.ContainerFromItem(data) as RadTreeViewItem;
if (node != null)
{
if (data == item)
break;
node = FindItemNodeInChildren(node, item);
if (node != null)
break;
}
}
return node;
}
protected RadTreeViewItem FindItemNodeInChildren(RadTreeViewItem parent, object item)
{
RadTreeViewItem node = null;
bool isExpanded = parent.IsExpanded;
if (!isExpanded) //Can't find child container unless the parent node is Expanded once
{
parent.IsExpanded = true;
parent.UpdateLayout();
}
foreach (object data in parent.Items)
{
node = parent.ItemContainerGenerator.ContainerFromItem(data) as RadTreeViewItem;
if (data == item && node != null)
break;
node = FindItemNodeInChildren(node, item);
if (node != null)
break;
}
if (node == null && parent.IsExpanded != isExpanded)
parent.IsExpanded = isExpanded;
if (node != null)
parent.IsExpanded = true;
return node;
}
}
<my:SelectableRadTreeViewExtended ItemsSource="{Binding ReportRoots}"
SelectionMode="Single"
IsEditable="False"
Grid.Row="1"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
x:Name="rtvReportRoots"
CustomSelectedItem="{Binding SelectedReportRoot, Mode=TwoWay}">
<my:SelectableRadTreeViewExtended.ItemTemplate>
<telerik:HierarchicalDataTemplate ItemsSource="{Binding Children}"
DataType="ViewModels:ReportRootEntityViewModel">
<Grid x:Name="NodeContainer"
Background="#01000000">
<TextBlock Text="{Binding Path=Name}"
Foreground="Gray"
controls:DropZoneHelper.DropZone="NotApplicable" />
</Grid>
</telerik:HierarchicalDataTemplate>
</my:SelectableRadTreeViewExtended.ItemTemplate>
</my:SelectableRadTreeViewExtended>
公共类SelectableRadTreeView扩展:RadTreeView
{
public SelectableRadtreeWebExtended()
:base()
{
this.SelectionChanged+=SelectableRadTreeViewExtended\u SelectionChanged;
}
void SelectableRadTreeViewExtended\u SelectionChanged(对象发送方,Telerik.Windows.Controls.selectionchangedventargs e)
{
this.SelectedItem=e.AddedItems[0];
如果(SelectedItem!=null)
{
this.CustomSelectedItem=this.SelectedItem;
}
}
公共对象CustomSelectedItem
{
获取{return(object)GetValue(CustomSelectedItemProperty);}
设置{SetValue(CustomSelectedItemProperty,value);}
}
public static readonly dependencProperty CustomSelectedItemProperty=dependencProperty.Register(“CustomSelectedItem”、typeof(object)、typeof(selectableradtreewextended)、newpropertymetadata(OnCustomSelectionItemChanged));
CustomSelectionItemChanged(DependencyObject d、DependencyPropertyChangedEventArgs e)上的私有静态无效
{
var obj=d作为可选择的RadtreeViewer扩展;
如果(如NewValue!=null)
{
RadTreeViewItem tvi=对象FindItemNode(e.NewValue);
如果(tvi!=null)
{
tvi.IsSelected=true;
obj.GetScrollHost().ScrollIntoView(tvi);
obj.UpdateLayout();
}
}
}
公共RadTreeViewItem FindItemNode(对象项)
{
RadTreeViewItem节点=空;
foreach(此.Items中的对象数据)
{
节点=this.ItemContainerGenerator.ContainerFromItem(数据)作为RadTreeViewItem;
如果(节点!=null)
{
如果(数据==项目)
打破
节点=FindItemNodeInChildren(节点,项);
如果(节点!=null)
打破
}
}
返回节点;
}
受保护的RadTreeViewItem FindItemNodeInChildren(RadTreeViewItem父项,对象项)
{
RadTreeViewItem节点=空;
bool isExpanded=parent.isExpanded;
if(!isExpanded)//除非父节点展开一次,否则找不到子容器
{
parent.IsExpanded=true;
parent.UpdateLayout();
}
foreach(parent.Items中的对象数据)
{
node=parent.ItemContainerGenerator.ContainerFromItem(数据)作为RadTreeViewItem;
如果(数据==项目和节点!=空)
打破
节点=FindItemNodeInChildren(节点,项);
如果(节点!=null)
打破
}
if(node==null&&parent.IsExpanded!=IsExpanded)
parent.IsExpanded=IsExpanded;
如果(节点!=null)
parent.IsExpanded=true;
返回节点;
}
}
我能够解决我的问题。请看下面我所做的。欢迎提出意见和建议以改进我的代码
在我的UI中,我将其添加到UserControl.Resources下
<telerik:ContainerBindingCollection x:Key="BindingCollection">
<telerik:ContainerBinding PropertyName="IsSelected"
Binding="{Binding IsSelected,Mode=TwoWay}" />
<telerik:ContainerBinding PropertyName="IsExpanded"
Binding="{Binding IsExpanded, Mode=TwoWay}" />
</telerik:ContainerBindingCollection>
<telerik:RadTreeView.ItemTemplate>
<telerik:HierarchicalDataTemplate ItemsSource="{Binding Children}"
DataType="ViewModels:ReportRootEntityViewModel"
telerik:ContainerBinding.ContainerBindings="{StaticResource BindingCollection}">
ReportRootEntityViewModel result = GetReportRootNode(Convert.ToInt32(data[0]), reportRoot.Children);
if (result != null)
{
if (_previousSelectedReportRoots != null)
{
_previousSelectedReportRoots.Parent.Parent.IsExpanded = false;
_previousSelectedReportRoots.Parent.IsExpanded = false;
_previousSelectedReportRoots.IsExpanded = false;
_previousSelectedReportRoots.IsSelected = false;
}
result.Parent.Parent.IsExpanded = true;
result.Parent.IsExpanded = true;
result.IsExpanded = true;
result.IsSelected = true;
SelectedReportRoot = result;
SelectedReportRootDisplayName = data[1];
DisplayLabel = "Display Name :";
_previousSelectedReportRoots = SelectedReportRoot;
return;
}