silverlight 中 ComboBox+TreeView 实现的下拉控件

ComboBox+TreeView实现的用户控件，设置数据源后，可以递归加载数据，支持双向绑定

控件截图：

XAML界面设计：

<UserControl x:Class="ChuanyeOA.CustomControls.Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree" 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:Ig<a href="/tag/nor/" target="_blank" class="keywords">nor</a>able="d" d:DesignHeight="30" d:DesignWidth="300" xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"> <Grid x:Name="LayoutRoot"> <Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a> Height="23" Name="cbMain" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" DropDow<a href="/tag/nop/" target="_blank" class="keywords">nop</a>ened="cbMain_DropDow<a href="/tag/nop/" target="_blank" class="keywords">nop</a>ened" DropDownClosed="cbMain_DropDownClosed"> <Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Item x:Name="cbItemTreeView"> <Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Item.Content> <sdk:TreeView Name="tvList" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" <a href="/tag/selecteditemchanged/" target="_blank" class="keywords">selecteditemchanged</a>="tvList_<a href="/tag/selecteditemchanged/" target="_blank" class="keywords">selecteditemchanged</a>" /> </Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Item.Content> </Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Item> <Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Item x:Name="cbItem<a href="/tag/dis/" target="_blank" class="keywords">dis</a>play" > </Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Item> </Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>> </Grid> </UserControl>

后台CS代码：

using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Collections.Generic; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Linq; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Net; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Controls; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Documents; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Input; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Media; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Media.Animation; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Shapes; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Data; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Collections; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Reflection; /******************************** * 创建人：刘跃飞 * 创建时间：2010-09-21 * <a href="/tag/gongnengmiaoshu/" target="_blank" class="keywords">功能描述</a>：Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>+TreeView实现的<a href="/tag/yonghu/" target="_blank" class="keywords">用户</a>控件，主要实现选择TreeView中的项做为Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>的项的<a href="/tag/gongneng/" target="_blank" class="keywords">功能</a> * <a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>描述：此控件包含以下几个<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a> * 1.ItemsSource:控件要绑定的数据源 * 2.SelectedValuePath:选中的值的<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a> * 3.<a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberPath：<a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>或设置为每个数据项要<a href="/tag/xianshi/" target="_blank" class="keywords">显示</a>的<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>的<a href="/tag/mingcheng/" target="_blank" class="keywords">名称</a> * 4.SelectedItem 当前选择的项 * 5.SelectedValue 当前选择的值 * 6.IsRecursionEnabled 设置是否启用递归加载数据源中的项。需要设置ChildName和ParentName两个<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a> * 7.ChildMemberPath 递归加载数据源时，实体中的子级<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>项 * 8. ParentMemberPath 递归加载数据源时，实体中的父级<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>项 * 9.IsExpandAll 设置TreeView打开时是全部打开状态还是收缩状态 <a href="/tag/mo/" target="_blank" class="keywords">默</a>认为True打开状态 * * 使用<a href="/tag/fangfa/" target="_blank" class="keywords">方法</a>： * 注意事项：本控件设计尚不完善，【ItemsSource】<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>需要在最后设置，否则，将<a href="/tag/tishicuowu/" target="_blank" class="keywords">提示错误</a> * 1.界面上直接设置，例如： * <myControl:Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree SelectedValue="{Binding DepartmentID,Mode=TwoWay}" <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberPath="DepartName" SelectedValuePath="ID" IsRecursionEnabled="True" ChildMemberPath="ID" ParentMemberPath="ParentID" ItemsSource="{Binding Data,Source={StaticResource a_DepartmentDomainDataSource}}"> * 2.在<a href="/tag/houtai/" target="_blank" class="keywords">后台</a><a href="/tag/daima/" target="_blank" class="keywords">代码</a>中直接设置，例如： * combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree1.<a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberPath = "Name"; * combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree1.SelectedValuePath = "ID"; * combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree1.ChildMemberPath = "ID"; * combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree1.ParentMemberPath = "ParentID"; * combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree1.IsRecursionEnabled = true; * combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree1.ItemSource = MyControls.DepartmentInfo.GetDepartment().AsEnumerable(); * 3.如果启用递归加载，父级ID为【0】的项，将作为根节点加载，如果没有父级ID为【0】的项，将无法进行加载 * 4.此控件用到了TreeView的ExpandAll扩展<a href="/tag/fangfa/" target="_blank" class="keywords">方法</a>，需要<a href="/tag/tianjia/" target="_blank" class="keywords">添加</a>【Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Controls.Toolkit】类库的引用，否则将<a href="/tag/tishi/" target="_blank" class="keywords">提示</a>找不到此<a href="/tag/fangfa/" target="_blank" class="keywords">方法</a> * ***********************************/ namespace ChuanyeOA.CustomControls { public partial class Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree : UserControl { public Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree() { InitializeComponent(); this.LayoutUpdated += new EventHandler(Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree_LayoutUpdated); } void Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree_LayoutUpdated(object sender,EventArgs e) { if (this.IsExpandAll) { //--展开所有节点 tvList.ExpandAll(); } } #region ItemSource 设置或获得绑定的数据源（<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>） public static readonly DependencyProperty ItemsSourceProperty = DependencyProperty.Register("ItemsSource",typeof(IEnumerable),typeof(Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree),new Property<a href="/tag/Meta/" target="_blank" class="keywords">Meta</a>data(new PropertyChangedCallback(ItemsSourcePropertyChangedCallBack))); /// <summary> /// 数据源 /// </summary> public IEnumerable ItemsSource { get { return (IEnumerable)this.GetValue(ItemsSourceProperty); } set { this.SetValue(ItemsSourceProperty,value); } } //--<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>更改的回调事件 public static void ItemsSourcePropertyChangedCallBack(DependencyObject sender,DependencyPropertyChangedEventArgs args) { if (sender != null) { Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree = sender as Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree; if (combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree.IsRecursionEnabled == false) { // 以列表的方式加载数据 combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree.LoadTreeViewDataWithList(); } else { //以递归的方式加载数据 combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree.LoadTreeViewDataWithRecursion(); } } } #endregion #region SelectedValuePath 选中的值的<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a> public static readonly DependencyProperty SelectedValuePathProperty = DependencyProperty.Register("SelectedValuePath",typeof(string),null); /// <summary> /// <a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>或设置每个<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>项要绑定的<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>的<a href="/tag/mingcheng/" target="_blank" class="keywords">名称</a> /// </summary> public string SelectedValuePath { get { return (string)this.GetValue(SelectedValuePathProperty); } set { this.SetValue(SelectedValuePathProperty,value); } } #endregion #region <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberPath <a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>或设置为每个数据项要<a href="/tag/xianshi/" target="_blank" class="keywords">显示</a>的<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>的<a href="/tag/mingcheng/" target="_blank" class="keywords">名称</a> public static readonly DependencyProperty <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberPathProperty = DependencyProperty.Register("<a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberPath",null); /// <summary> /// <a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>或设置为每个数据项要<a href="/tag/xianshi/" target="_blank" class="keywords">显示</a>的<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>的<a href="/tag/mingcheng/" target="_blank" class="keywords">名称</a> /// </summary> public string <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberPath { get { return (string)this.GetValue(<a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberPathProperty); } set { this.SetValue(<a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberPathProperty,value); } } #endregion #region SelectedItem 当前选择的项 public static readonly DependencyProperty SelectedItemProperty = DependencyProperty.Register("SelectedItem",typeof(object),null); /// <summary> /// 当前选择的项 /// </summary> public object SelectedItem { get { return this.GetValue(SelectedItemProperty); } set { this.SetValue(SelectedItemProperty,value); } } #endregion #region SelectedValue 当前选择的值 public static readonly DependencyProperty SelectedValueProperty = DependencyProperty.Register("SelectedValue",null); /// <summary> /// 当前选择的值 /// </summary> public object SelectedValue { get { return this.GetValue(SelectedValueProperty); } set { this.SetValue(SelectedValueProperty,value); } } #endregion #region IsRecursionEnabled 设置是否启用递归加载数据源中的项。需要设置ChildName和ParentName两个<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a> public static readonly DependencyProperty IsRecursionEnabledProperty = DependencyProperty.Register("IsRecursionEnabled",typeof(bool),new Property<a href="/tag/Meta/" target="_blank" class="keywords">Meta</a>data(new PropertyChangedCallback(IsRecursionEnabledCallBack))); /// <summary> /// 设置是否启用递归加载数据源中的项。 /// 需要设置ChildMemberPath和ParentMemberPath两个<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>，如果这两个<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>没有设置，则不启用递归加载。 /// </summary> public bool IsRecursionEnabled { get { return (bool)this.GetValue(IsRecursionEnabledProperty); } set { //if (value == true) //{ // //---如果子级和父级<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>设置不为空则开始递归加载数据 // if (!string.IsNullOrEmpty(this.ChildMemberPath) && !string.IsNullOrEmpty(this.ParentMemberPath)) // { // if (this.ItemSource != null) // { // this.LoadTreeViewDataWithRecursion(); // } // } //} this.SetValue(IsRecursionEnabledProperty,value); } } public static void IsRecursionEnabledCallBack(DependencyObject sender,DependencyPropertyChangedEventArgs args) { if (sender != null) { Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree = sender as Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree; combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree.IsRecursionEnabled = (bool)args.NewValue; } } #endregion #region ChildMemberPath 递归加载数据源时，实体中的子级<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>项 public static readonly DependencyProperty ChildMemberPathProperty = DependencyProperty.Register("ChildMemberPath",null); /// <summary> /// 递归加载数据源时，实体中的子级<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>项 /// </summary> public string ChildMemberPath { get { return (string)this.GetValue(ChildMemberPathProperty); } set { this.SetValue(ChildMemberPathProperty,value); } } #endregion #region ParentMemberPath 递归加载数据源时，实体中的父级<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>项 public static readonly DependencyProperty ParentMemberPathProperty = DependencyProperty.Register("ParentMemberPath",null); /// <summary> /// 递归加载数据源时，实体中的父级<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>项 /// </summary> public string ParentMemberPath { get { return (string)this.GetValue(ParentMemberPathProperty); } set { this.SetValue(ParentMemberPathProperty,value); } } #endregion #region IsExpandAll 设置TreeView打开时是全部打开状态还是收缩状态 <a href="/tag/mo/" target="_blank" class="keywords">默</a>认为True打开状态 /// <summary> /// 设置TreeView打开时是全部打开状态还是收缩状态 <a href="/tag/mo/" target="_blank" class="keywords">默</a>认为True打开状态 /// </summary> public static readonly DependencyProperty IsExpandAllProperty = DependencyProperty.Register("IsExpandAll",new Property<a href="/tag/Meta/" target="_blank" class="keywords">Meta</a>data(true)); /// <summary> /// 设置TreeView打开时是全部打开状态还是收缩状态 <a href="/tag/mo/" target="_blank" class="keywords">默</a>认为True打开状态 /// </summary> public bool IsExpandAll { get { return (bool)this.GetValue(IsExpandAllProperty); } set { this.SetValue(IsExpandAllProperty,value); } } #endregion #region 加载数据源<a href="/tag/fangfa/" target="_blank" class="keywords">方法</a> /// <summary> /// 用列表的方式加载数据源 /// </summary> private void LoadTreeViewDataWithList() { tvList.Items.Clear();//先清空所有的数据 foreach (var item in ItemsSource) { Type objType = item.GetType(); //--用反射的方式获得<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>对应的值 PropertyInfo <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberInfo = objType.GetProperty(this.<a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberPath); PropertyInfo selectedValueInfo = objType.GetProperty(this.SelectedValuePath); //--当前要<a href="/tag/xianshi/" target="_blank" class="keywords">显示</a>的文本 string <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playText = <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberInfo.GetValue(item,null).ToString(); //--当前选择的值 string selectedValue = selectedValueInfo.GetValue(item,null).ToString(); TreeViewItem myitem = new TreeViewItem(); myitem.Header = <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playText; myitem.Tag = selectedValue; tvList.Items.Add(myitem); } } /// <summary> /// 用递归加载数据源 /// </summary> private void LoadTreeViewDataWithRecursion() { tvList.Items.Clear();//先清空所有的数据 if (ItemsSource != null) { //---如果子级和父级<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>设置不为空则开始递归加载数据 if (string.IsNullOrEmpty(this.ChildMemberPath) || string.IsNullOrEmpty(this.ParentMemberPath)) { Message<a href="/tag/Box/" target="_blank" class="keywords">Box</a>.Show("在【Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>Tree】控件中，如果启用了递归方式加载数据，必须设置【ChildMemberPath】和【ParentMemberPath】<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>的值。"); } foreach (var item in ItemsSource) { Type objType = item.GetType(); //--用反射的方式获得<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>对应的值 PropertyInfo <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberInfo = objType.GetProperty(this.<a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberPath); PropertyInfo selectedValueInfo = objType.GetProperty(this.SelectedValuePath); PropertyInfo childValueInfo = objType.GetProperty(this.ChildMemberPath); PropertyInfo parentValueInfo = objType.GetProperty(this.ParentMemberPath); //--当前要<a href="/tag/xianshi/" target="_blank" class="keywords">显示</a>的文本 string <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playText = <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberInfo.GetValue(item,null).ToString(); //--当前选择的值 string selectedValue = selectedValueInfo.GetValue(item,null).ToString(); //---子级绑定的值 string childValue = childValueInfo.GetValue(item,null).ToString(); //--父级绑定的值 string parentValue = parentValueInfo.GetValue(item,null).ToString(); if (string.IsNullOrEmpty(childValue) || string.IsNullOrEmpty(parentValue)) { return; } if (parentValue == "0")//--所有的父级的值为【0】的数据<a href="/tag/mo/" target="_blank" class="keywords">默</a>认为<a href="/tag/tianjia/" target="_blank" class="keywords">添加</a>到根节点。 { TreeViewItem myitem = new TreeViewItem(); myitem.Header = <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playText; myitem.Tag = selectedValue; this.LoadItems(myitem,ItemsSource); tvList.Items.Add(myitem); } } } } /// <summary> /// 递归加载数据源 /// </summary> /// <p<a href="/tag/ara/" target="_blank" class="keywords">ara</a>m name="treeviewitem"></p<a href="/tag/ara/" target="_blank" class="keywords">ara</a>m> /// <p<a href="/tag/ara/" target="_blank" class="keywords">ara</a>m name="mylist"></p<a href="/tag/ara/" target="_blank" class="keywords">ara</a>m> private void LoadItems(TreeViewItem treeviewitem,IEnumerable mylist) { if (mylist != null) { foreach (var item in ItemsSource) { Type objType = item.GetType(); //--用反射的方式获得<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>对应的值 PropertyInfo <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberInfo = objType.GetProperty(this.<a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberPath); PropertyInfo selectedValueInfo = objType.GetProperty(this.SelectedValuePath); PropertyInfo childValueInfo = objType.GetProperty(this.ChildMemberPath); PropertyInfo parentValueInfo = objType.GetProperty(this.ParentMemberPath); //--当前要<a href="/tag/xianshi/" target="_blank" class="keywords">显示</a>的文本 string <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playText = <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberInfo.GetValue(item,null).ToString(); if (string.IsNullOrEmpty(childValue) || string.IsNullOrEmpty(parentValue)) { return; } if (treeviewitem.Tag.ToString() == parentValue) { TreeViewItem myitem = new TreeViewItem(); myitem.Header = <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playText; myitem.Tag = selectedValue; treeviewitem.Items.Add(myitem); this.LoadItems(myitem,ItemsSource); } } } } #endregion /// <summary> /// TreeView的选择事件 /// </summary> /// <p<a href="/tag/ara/" target="_blank" class="keywords">ara</a>m name="sender"></p<a href="/tag/ara/" target="_blank" class="keywords">ara</a>m> /// <p<a href="/tag/ara/" target="_blank" class="keywords">ara</a>m name="e"></p<a href="/tag/ara/" target="_blank" class="keywords">ara</a>m> private void tvList_<a href="/tag/selecteditemchanged/" target="_blank" class="keywords">selecteditemchanged</a>(object sender,RoutedPropertyChangedEventArgs<object> e) { if (tvList.Items.Count > 0) { this.SelectedItem = tvList.SelectedItem; if (string.IsNullOrEmpty(this.<a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberPath) || string.IsNullOrEmpty(this.SelectedValuePath)) { Message<a href="/tag/Box/" target="_blank" class="keywords">Box</a>.Show("此控件必须设置【<a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberPath】和【SelectedValuePath】<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>的值"); return; } Type objType = null; PropertyInfo <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberInfo = null; PropertyInfo selectedValueInfo = null; foreach (var item in ItemsSource) { //<a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>实体的类型 objType = item.GetType(); //--用反射的方式获得<a href="/tag/shuxing/" target="_blank" class="keywords">属性</a>对应的值 <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberInfo = objType.GetProperty(this.<a href="/tag/dis/" target="_blank" class="keywords">dis</a>playMemberPath); selectedValueInfo = objType.GetProperty(this.SelectedValuePath); break; } TreeViewItem treeviewitem = tvList.SelectedItem as TreeViewItem; //--当前要<a href="/tag/xianshi/" target="_blank" class="keywords">显示</a>的文本 string <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playText = treeviewitem.Header.ToString(); //--当前选择的值 this.SelectedValue = treeviewitem.Tag.ToString(); cbItem<a href="/tag/dis/" target="_blank" class="keywords">dis</a>play.Content = <a href="/tag/dis/" target="_blank" class="keywords">dis</a>playText;//设置Combo<a href="/tag/Box/" target="_blank" class="keywords">Box</a>要<a href="/tag/xianshi/" target="_blank" class="keywords">显示</a>的文本 //设置当前选择的项 foreach (var item in ItemsSource) { string selvalue = selectedValueInfo.GetValue(item,null).ToString(); if (!string.IsNullOrEmpty(selvalue)) { if (treeviewitem.Tag.ToString() == selvalue) { this.SelectedItem = item; ; } } } } } private void cbMain_DropDow<a href="/tag/nop/" target="_blank" class="keywords">nop</a>ened(object sender,EventArgs e) { //--打开时隐藏要<a href="/tag/xianshi/" target="_blank" class="keywords">显示</a>的项 cbItem<a href="/tag/dis/" target="_blank" class="keywords">dis</a>play.Visibility = Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Visibility.Collapsed; cbItemTreeView.Visibility = Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Visibility.Visible; } private void cbMain_DropDownClosed(object sender,EventArgs e) { //--<a href="/tag/guanbi/" target="_blank" class="keywords">关闭</a>时，使<a href="/tag/xianshi/" target="_blank" class="keywords">显示</a>的项可见 cbItem<a href="/tag/dis/" target="_blank" class="keywords">dis</a>play.Visibility = Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Visibility.Visible; cbItemTreeView.Visibility = Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Visibility.Collapsed; cbMain.SelectedItem = cbItem<a href="/tag/dis/" target="_blank" class="keywords">dis</a>play;//设置当前的选中项为<a href="/tag/xianshi/" target="_blank" class="keywords">显示</a>项 } } }

silverlight 中 ComboBox+TreeView 实现的下拉控件

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