Hey, i have a RadTreeListView that i used to display my data, when i change the value of RowDetailsTemplate property in runtime, the event that called SelectionChanged fired more than 15 times, here is my code:
XAML Code:
<telerik:RadTreeListView ItemsSource="{Binding ItemSearchingResults}"
RowDetailsVisibilityMode="VisibleWhenSelected"
ScrollViewer.VerticalScrollBarVisibility="Auto"
RowDetailsTemplate="{Binding RowDetailsTemplate}"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
SelectedItem="{Binding SelectedItem, Mode=TwoWay}"
CanUserFreezeColumns="False" SelectionMode="Single"
VerticalAlignment="Stretch" SelectionUnit="FullRow"
CanUserDeleteRows="False" GridLinesVisibility="Both"
CanUserInsertRows="False" AutoGenerateColumns="False"
AutoLoadHierarchy="True" HierarchyColumnIndex="1" HierarchyIndent="25"
RowIndicatorVisibility="Collapsed" ShowColumnFooters="False" HorizontalAlignment="Stretch">
<telerik:RadTreeListView.Columns>
<telerik:GridViewDataColumn DataMemberBinding="{Binding ItemNumber}" IsReadOnly="True"
Header="{x:Static tterpResources:UcItemSearching.Number}" Width="*" />
<telerik:GridViewDataColumn DataMemberBinding="{Binding ItemArabicName}" IsReadOnly="True"
Header="{x:Static tterpResources:UcItemSearching.ArabicName}" Width="*" />
<telerik:GridViewDataColumn DataMemberBinding="{Binding ItemEnglishName}" IsReadOnly="True"
Header="{x:Static tterpResources:UcItemSearching.EnglishName}" Width="*" />
<telerik:GridViewDataColumn DataMemberBinding="{Binding ItemGroupArabicName}" IsReadOnly="True"
Header="{x:Static tterpResources:UcItemSearching.Group}" Width="*" />
<telerik:GridViewDataColumn DataMemberBinding="{Binding ItemTypeArabicName}" IsReadOnly="True"
Header="{x:Static tterpResources:UcItemSearching.Type}" Width="*" />
</telerik:RadTreeListView.Columns>
<interactivity:Interaction.Triggers>
<interactivity:EventTrigger EventName="SelectionChanged">
<interactions:CallMethodAction MethodName="OnSelectItemChanged" TargetObject="{Binding}" />
</interactivity:EventTrigger>
</interactivity:Interaction.Triggers>
<telerik:RadTreeListView.ChildTableDefinitions>
<telerik:TreeListViewTableDefinition ItemsSource="{Binding ChildItems,
RelativeSource={RelativeSource AncestorType=models:ItemSearchingModel}}" />
</telerik:RadTreeListView.ChildTableDefinitions>
</telerik:RadTreeListView>
C# Code:
public void OnSelectItemChanged()
{
if (SelectedItem == null || !SelectedItem.IsDataChanged) return;
//Get child items of selected item.
if (!SelectedItem.IsChildLoadedOnce)
{
SelectedItem.IsChildLoadedOnce = true;
SelectedItem.ChildItems = GetChildItemsOfParentItem(SelectedItem.ItemTreeId);
}
//Get alternative items of selected item.
if (!SelectedItem.IsAlternativeLoadedOnce)
{
SelectedItem.IsAlternativeLoadedOnce = true;
SelectedItem.AlternativeItems = GetAlternativeItemsOfSelectedItem(SelectedItem.ItemTreeId);
}
RowDetailsTemplate = SelectedItem.AlternativeItems.Count > 0 ? Application.Current.FindResource("AlternativeItemsDataTemplate") as DataTemplate : null;
}
private ObservableCollection<ItemSearchingModel> GetChildItemsOfParentItem(long parentItemId)
{
var childItems = _erpEntities.ItemTrees.Where(itemTree => itemTree.ParentId == parentItemId);
if (!childItems.Any()) return new ObservableCollection<ItemSearchingModel>();
var childItemSearchingModelList = new ObservableCollection<ItemSearchingModel>();
foreach (var childItemTree in childItems)
{
childItemSearchingModelList.Add(new ItemSearchingModel
{
ItemTreeId = childItemTree.Id,
ItemNumber = childItemTree.Number,
ItemArabicName = childItemTree.NameArabic,
ItemEnglishName = childItemTree.NameEnglish,
ChildItems = new ObservableCollection<ItemSearchingModel>(),
AlternativeItems = new ObservableCollection<ItemSearchingModel>(),
ItemTypeArabicName = childItemTree.ItemsType != null ? childItemTree.ItemsType.NameArabic : string.Empty,
ItemTypeEnglishName = childItemTree.ItemsType != null ? childItemTree.ItemsType.NameEnglish : string.Empty,
ItemGroupArabicName = childItemTree.ItemsGroup != null ? childItemTree.ItemsGroup.NameArabic : string.Empty,
ItemGroupEnglishName = childItemTree.ItemsGroup != null ? childItemTree.ItemsGroup.NameEnglish : string.Empty
});
}
return childItemSearchingModelList;
}
private ObservableCollection<ItemSearchingModel> GetAlternativeItemsOfSelectedItem(long selectedItemId)
{
//Get the child items.
var alternativeItems = _erpEntities.AlternativeItems.Where(itemTree => itemTree.BasicItemTreeId == selectedItemId);
if (!alternativeItems.Any()) return new ObservableCollection<ItemSearchingModel>();
var alternativeItemsSearchingModelList = new ObservableCollection<ItemSearchingModel>();
foreach (var childItemTree in alternativeItems)
{
alternativeItemsSearchingModelList.Add(new ItemSearchingModel
{
ItemTreeId = childItemTree.Id,
IsAlternativeLoadedOnce = true,
ItemNumber = childItemTree.ItemTree.Number,
ItemArabicName = childItemTree.ItemTree.NameArabic,
ItemEnglishName = childItemTree.ItemTree.NameEnglish,
ChildItems = new ObservableCollection<ItemSearchingModel>(),
AlternativeItems = new ObservableCollection<ItemSearchingModel>(),
ItemTypeArabicName = childItemTree.ItemTree.ItemsType != null ? childItemTree.ItemTree.ItemsType.NameArabic : string.Empty,
ItemTypeEnglishName = childItemTree.ItemTree.ItemsType != null ? childItemTree.ItemTree.ItemsType.NameEnglish : string.Empty,
ItemGroupArabicName = childItemTree.ItemTree.ItemsGroup != null ? childItemTree.ItemTree.ItemsGroup.NameArabic : string.Empty,
ItemGroupEnglishName = childItemTree.ItemTree.ItemsGroup != null ? childItemTree.ItemTree.ItemsGroup.NameEnglish : string.Empty
});
}
return alternativeItemsSearchingModelList;
}
1 Answer, 1 is accepted
From the provided code snippet I am not able to clarify the exact cause for such behavior. Would it be possible for you to provide a runnable demo that demonstrates the issue, or the full code so that I can build a sample project on my side?
Regards,
Stefan X1
Telerik