lightswitch 添加 TreeView 控件

<UserControl xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"  x:Class="LightSwitchApplication.TreeViewControl.DepartmentTreeViewControl"
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:local="clr-namespace:LightSwitchApplication.TreeViewControl"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">

<UserControl.Resources>
<local:EntityCollectionValueConverter x:Key="EntityCollectionValueConverter" />
</UserControl.Resources>

<Grid x:Name="LayoutRoot" Background="White">

<StackPanel Orientation="Horizontal">
<sdk:TreeView Name="treeViewControl" SelectedItemChanged="treeViewControl_SelectedItemChanged"  ItemsSource="{Binding Screen.DepartmentTree}">
<sdk:TreeView.ItemTemplate>

<sdk:HierarchicalDataTemplate
ItemsSource="{Binding
Converter={StaticResource EntityCollectionValueConverter},
ConverterParameter=Children}">

<StackPanel Orientation="Horizontal">

<!--<CheckBox IsChecked="{Binding IsSelected, Mode=TwoWay}"/>-->

<TextBlock Text="{Binding Path=Name, Mode=TwoWay}"
Margin="5,0" Width="74" />
</StackPanel>
</sdk:HierarchicalDataTemplate>
</sdk:TreeView.ItemTemplate>
</sdk:TreeView>
</StackPanel>
</Grid>
</UserControl>

using Microsoft.LightSwitch.Framework.Client;
using Microsoft.LightSwitch.Presentation;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace LightSwitchApplication.TreeViewControl
{
public partial class DepartmentTreeViewControl : UserControl
{
public DepartmentTreeViewControl()
{
InitializeComponent();
}

private void treeViewControl_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
var selectItem = (LightSwitchApplication.Department)treeViewControl.SelectedItem;
var type1 = selectItem.GetType();
var context = (IContentItem)this.DataContext;
var screen = context.Screen;
var data = (VisualCollection<LightSwitchApplication.Department>)screen.Details.Properties["DepartmentTree"].Value;
data.SelectedItem = selectItem;
//data.text= selectItem.Details.Properties["Id"].Value;

}

}
}

using Microsoft.LightSwitch;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace LightSwitchApplication.TreeViewControl
{
public class EntityCollectionValueConverter : IValueConverter
{
public object Convert(object value,
Type targetType,
object parameter,
System.Globalization.CultureInfo culture)
{
string strErrorMessage
= "Converter parameter should be set to the property name that will serve as source of data";

IEntityObject entity = value as IEntityObject;
if (entity == null)
throw new ArgumentException("The converter should be using an entity object");
string sourcePropertyName = parameter as string;
if (string.IsNullOrWhiteSpace(sourcePropertyName))
throw new ArgumentException(strErrorMessage);

// Enumerate the source property using logic dispatcher
// and prepare the collection of entities that the control will bind to
var entities = new ObservableCollection<IEntityObject>();
var temporaryEntites = new List<IEntityObject>();
entity.Details.Dispatcher.BeginInvoke(delegate
{
IEntityCollection eCollection =
entity.Details.Properties[sourcePropertyName].Value as IEntityCollection;
if (eCollection == null)
{
Debug.Assert(false, "The property " + sourcePropertyName + " is not an entity collection");
return;
}
// Now we are on the logic thread. We cannot just stuff the observable collection
// with entities because the collection will immediately raise Changed events
// and this will result in invalid cross-thread access. So we'll use a temporary collection
// and copy the entites again on the UI thread
foreach (IEntityObject e in eCollection)
{
temporaryEntites.Add(e);
}
Microsoft.LightSwitch.Threading.Dispatchers.Main.BeginInvoke(delegate
{
// I wish ObservableCollection had an AddRange() method...
foreach (IEntityObject e in temporaryEntites)
{
entities.Add(e);
}
});
});
return entities;
}
public object ConvertBack(object value,
Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
}

public partial class CategoriesListDetail
{
private TreeView treeView = null;
partial void CategoriesListDetail_InitializeDataWorkspace(List<IDataService> saveChangesTo)
{
// Write your code here.

}

partial void CategoriesListDetail_Created()
{
// Write your code here.
this.P_Name = "";
this.RootNode.Load();
this.FindControl("TreeViewControl").ControlAvailable += ((o, e) =>
{
treeView = e.Control as TreeView;
treeView.BorderThickness = new Thickness(1);
if (treeView.Items.Count == 0)
{
foreach (var item in this.RootNode)
{
TreeViewItem rootItem = new TreeViewItem() { Header = item.Name, Tag = item.Id };
treeView.Items.Add(rootItem);
}
treeView.SelectedItemChanged += new RoutedPropertyChangedEventHandler<object>(TreeViewItem_SelectedItemChanged);
}
});
}
private void TreeViewItem_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
var parentItem = e.NewValue as TreeViewItem;
this.P_Name = (string)parentItem.Header;
this.p_id = (int)parentItem.Tag;
///when collection is refreshed the event SelectedNodeEmployees_Changed is hooked up
///do not use Load method to avoid caching
this.SelectedChildrenNodes.Refresh();
}

partial void SelectedChildrenNodes_Changed(NotifyCollectionChangedEventArgs e)
{
if (treeView != null)
{
Dispatchers.Main.BeginInvoke(() =>
{
var parentItem = treeView.SelectedItem as TreeViewItem;
if (parentItem != null)
{
if (parentItem.Items.Count == 0 && this.SelectedChildrenNodes.Count() > 0)
{
foreach (var item in this.SelectedChildrenNodes) //.Where(act => act.Title != "???")
{
TreeViewItem newChildItem = new TreeViewItem() { Header = item.Name, Tag = item.Id };
parentItem.Items.Add(newChildItem);
}
}
}
});
}
}

}