代码片段

　　

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

　　

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
     
      ();            var temporaryEntites = new List
      
       ();            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();        }    }}
      
     

　片段2

public partial class CategoriesListDetail    {        private TreeView treeView = null;        partial void CategoriesListDetail_InitializeDataWorkspace(List
     
       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