博客

功能描述：

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.ComboBoxTree”<br /> xmlns=”http://schemas.microsoft.com/winfx/2006/xaml/presentation”<br /> xmlns:x=”http://schemas.microsoft.com/winfx/2006/xaml”<br /> xmlns:d=”http://schemas.microsoft.com/expression/blend/2008″<br /> xmlns:mc=”http://schemas.openxmlformats.org/markup-compatibility/2006″<br /> mc:Ignorable=”d”<br /> d:DesignHeight=”30″ d:DesignWidth=”300″ xmlns:sdk=”http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk”></p> <p> <Grid x:Name=”LayoutRoot”><br /> <ComboBox Height=”23″ Name=”cbMain” HorizontalAlignment=”Stretch” VerticalAlignment=”Stretch” DropDownOpened=”cbMain_DropDownOpened” DropDownClosed=”cbMain_DropDownClosed”><br /> <ComboBoxItem x:Name=”cbItemTreeView”><br /> <ComboBoxItem.Content><br /> <sdk:TreeView Name=”tvList” HorizontalAlignment=”Stretch” VerticalAlignment=”Stretch” SelectedItemChanged=”tvList_SelectedItemChanged” /><br /> </ComboBoxItem.Content><br /> </ComboBoxItem></p> <p> <ComboBoxItem x:Name=”cbItemDisplay” ><br /> </ComboBoxItem><br /> </ComboBox><br /> </Grid><br /> </UserControl><br />

后台CS代码：

using System;<br /> using System.Collections.Generic;<br /> using System.Linq;<br /> using System.Net;<br /> using System.Windows;<br /> using System.Windows.Controls;<br /> using System.Windows.Documents;<br /> using System.Windows.Input;<br /> using System.Windows.Media;<br /> using System.Windows.Media.Animation;<br /> using System.Windows.Shapes;</p> <p>using System.Windows.Data;</p> <p>using System.Collections;<br /> using System.Reflection;</p> <p>/********************************<br /> * 创建人：刘跃飞<br /> * 创建时间：2010-09-21<br /> * 功能描述：ComboBox+TreeView实现的用户控件，主要实现选择TreeView中的项做为ComboBox的项的功能<br /> * 属性描述：此控件包含以下几个属性<br /> * 1.ItemsSource:控件要绑定的数据源<br /> * 2.SelectedValuePath:选中的值的属性<br /> * 3.DisplayMemberPath：获取或设置为每个数据项要显示的属性的名称<br /> * 4.SelectedItem 当前选择的项<br /> * 5.SelectedValue 当前选择的值<br /> * 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两个属性<br /> * 7.ChildMemberPath 递归加载数据源时，实体中的子级属性项<br /> * 8. ParentMemberPath 递归加载数据源时，实体中的父级属性项<br /> * 9.IsExpandAll 设置TreeView打开时是全部打开状态还是收缩状态 默认为True打开状态<br /> *<br /> * 使用方法：<br /> * 注意事项：本控件设计尚不完善，【ItemsSource】属性需要在最后设置，否则，将提示错误<br /> * 1.界面上直接设置，例如：<br /> * <myControl:ComboBoxTree SelectedValue=”{Binding DepartmentID, Mode=TwoWay}” DisplayMemberPath=”DepartName” SelectedValuePath=”ID” IsRecursionEnabled=”True” ChildMemberPath=”ID” ParentMemberPath=”ParentID” ItemsSource=”{Binding Data, Source={StaticResource a_DepartmentDomainDataSource}}”><br /> * 2.在后台代码中直接设置，例如：<br /> * comboBoxTree1.DisplayMemberPath = “Name”;<br /> * comboBoxTree1.SelectedValuePath = “ID”;<br /> * comboBoxTree1.ChildMemberPath = “ID”;<br /> * comboBoxTree1.ParentMemberPath = “ParentID”;<br /> * comboBoxTree1.IsRecursionEnabled = true;<br /> * comboBoxTree1.ItemSource = MyControls.DepartmentInfo.GetDepartment().AsEnumerable();<br /> * 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<br /> * 4.此控件用到了TreeView的ExpandAll扩展方法，需要添加【System.Windows.Controls.Toolkit】类库的引用，否则将提示找不到此方法<br /> * ***********************************/</p> <p>namespace ChuanyeOA.CustomControls<br /> {<br /> public partial class ComboBoxTree : UserControl<br /> {<br /> public ComboBoxTree()<br /> {<br /> InitializeComponent();</p> <p> this.LayoutUpdated += new EventHandler(ComboBoxTree_LayoutUpdated);<br /> }</p> <p> void ComboBoxTree_LayoutUpdated(object sender, EventArgs e)<br /> {<br /> if (this.IsExpandAll)<br /> {<br /> //–展开所有节点<br /> tvList.ExpandAll();<br /> }<br /> }</p> <p> #region ItemSource 设置或获得绑定的数据源（属性）</p> <p> public static readonly DependencyProperty ItemsSourceProperty =<br /> DependencyProperty.Register(“ItemsSource”, typeof(IEnumerable), typeof(ComboBoxTree), new PropertyMetadata(new PropertyChangedCallback(ItemsSourcePropertyChangedCallBack)));<br /> /// <summary><br /> /// 数据源<br /> /// </summary><br /> public IEnumerable ItemsSource<br /> {<br /> get<br /> {<br /> return (IEnumerable)this.GetValue(ItemsSourceProperty);<br /> }<br /> set<br /> {<br /> this.SetValue(ItemsSourceProperty, value);<br /> }<br /> }<br /> //–属性更改的回调事件<br /> public static void ItemsSourcePropertyChangedCallBack(DependencyObject sender, DependencyPropertyChangedEventArgs args)<br /> {<br /> if (sender != null)<br /> {<br /> ComboBoxTree comboBoxTree = sender as ComboBoxTree;</p> <p> if (comboBoxTree.IsRecursionEnabled == false)<br /> {<br /> // 以列表的方式加载数据<br /> comboBoxTree.LoadTreeViewDataWithList();<br /> }<br /> else<br /> {<br /> //以递归的方式加载数据<br /> comboBoxTree.LoadTreeViewDataWithRecursion();<br /> }</p> <p> }<br /> }</p> <p> #endregion</p> <p> #region SelectedValuePath 选中的值的属性</p> <p> public static readonly DependencyProperty SelectedValuePathProperty =<br /> DependencyProperty.Register(“SelectedValuePath”, typeof(string), typeof(ComboBoxTree), null);<br /> /// <summary><br /> /// 获取或设置每个属性项要绑定的属性的名称<br /> /// </summary><br /> public string SelectedValuePath<br /> {<br /> get<br /> {<br /> return (string)this.GetValue(SelectedValuePathProperty);<br /> }<br /> set<br /> {<br /> this.SetValue(SelectedValuePathProperty, value);<br /> }<br /> }</p> <p> #endregion</p> <p> #region DisplayMemberPath 获取或设置为每个数据项要显示的属性的名称</p> <p> public static readonly DependencyProperty DisplayMemberPathProperty =<br /> DependencyProperty.Register(“DisplayMemberPath”, typeof(string), typeof(ComboBoxTree), null);<br /> /// <summary><br /> /// 获取或设置为每个数据项要显示的属性的名称<br /> /// </summary><br /> public string DisplayMemberPath<br /> {<br /> get<br /> {<br /> return (string)this.GetValue(DisplayMemberPathProperty);<br /> }<br /> set<br /> {<br /> this.SetValue(DisplayMemberPathProperty, value);<br /> }<br /> }</p> <p> #endregion</p> <p> #region SelectedItem 当前选择的项</p> <p> public static readonly DependencyProperty SelectedItemProperty =<br /> DependencyProperty.Register(“SelectedItem”, typeof(object), typeof(ComboBoxTree), null);<br /> /// <summary><br /> /// 当前选择的项<br /> /// </summary><br /> public object SelectedItem<br /> {<br /> get<br /> {<br /> return this.GetValue(SelectedItemProperty);<br /> }<br /> set<br /> {<br /> this.SetValue(SelectedItemProperty, value);<br /> }<br /> }</p> <p> #endregion</p> <p> #region SelectedValue 当前选择的值</p> <p> public static readonly DependencyProperty SelectedValueProperty =<br /> DependencyProperty.Register(“SelectedValue”, typeof(object), typeof(ComboBoxTree), null);<br /> /// <summary><br /> /// 当前选择的值<br /> /// </summary><br /> public object SelectedValue<br /> {<br /> get<br /> {<br /> return this.GetValue(SelectedValueProperty);<br /> }<br /> set<br /> {<br /> this.SetValue(SelectedValueProperty, value);<br /> }<br /> }</p> <p> #endregion</p> <p> #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两个属性</p> <p> public static readonly DependencyProperty IsRecursionEnabledProperty =<br /> DependencyProperty.Register(“IsRecursionEnabled”, typeof(bool), typeof(ComboBoxTree), new PropertyMetadata(new PropertyChangedCallback(IsRecursionEnabledCallBack)));</p> <p> /// <summary><br /> /// 设置是否启用递归加载数据源中的项。<br /> /// 需要设置ChildMemberPath和ParentMemberPath两个属性，如果这两个属性没有设置，则不启用递归加载。<br /> /// </summary><br /> public bool IsRecursionEnabled<br /> {<br /> get<br /> {<br /> return (bool)this.GetValue(IsRecursionEnabledProperty);<br /> }<br /> set<br /> {<br /> //if (value == true)<br /> //{<br /> // //—如果子级和父级属性设置不为空 则开始递归加载数据<br /> // if (!string.IsNullOrEmpty(this.ChildMemberPath) && !string.IsNullOrEmpty(this.ParentMemberPath))<br /> // {<br /> // if (this.ItemSource != null)<br /> // {<br /> // this.LoadTreeViewDataWithRecursion();<br /> // }<br /> // }<br /> //}<br /> this.SetValue(IsRecursionEnabledProperty, value);<br /> }<br /> }</p> <p> public static void IsRecursionEnabledCallBack(DependencyObject sender, DependencyPropertyChangedEventArgs args)<br /> {<br /> if (sender != null)<br /> {<br /> ComboBoxTree comboBoxTree = sender as ComboBoxTree;</p> <p> comboBoxTree.IsRecursionEnabled = (bool)args.NewValue;<br /> }<br /> }</p> <p> #endregion</p> <p> #region ChildMemberPath 递归加载数据源时，实体中的子级属性项</p> <p> public static readonly DependencyProperty ChildMemberPathProperty =<br /> DependencyProperty.Register(“ChildMemberPath”, typeof(string), typeof(ComboBoxTree), null);<br /> /// <summary><br /> /// 递归加载数据源时，实体中的子级属性项<br /> /// </summary><br /> public string ChildMemberPath<br /> {<br /> get<br /> {<br /> return (string)this.GetValue(ChildMemberPathProperty);<br /> }<br /> set<br /> {<br /> this.SetValue(ChildMemberPathProperty, value);<br /> }<br /> }</p> <p> #endregion</p> <p> #region ParentMemberPath 递归加载数据源时，实体中的父级属性项</p> <p> public static readonly DependencyProperty ParentMemberPathProperty =<br /> DependencyProperty.Register(“ParentMemberPath”, typeof(string), typeof(ComboBoxTree), null);<br /> /// <summary><br /> /// 递归加载数据源时，实体中的父级属性项<br /> /// </summary><br /> public string ParentMemberPath<br /> {<br /> get<br /> {<br /> return (string)this.GetValue(ParentMemberPathProperty);<br /> }<br /> set<br /> {<br /> this.SetValue(ParentMemberPathProperty, value);<br /> }<br /> }</p> <p> #endregion</p> <p> #region IsExpandAll 设置TreeView打开时是全部打开状态还是收缩状态 默认为True打开状态<br /> /// <summary><br /> /// 设置TreeView打开时是全部打开状态还是收缩状态 默认为True打开状态<br /> /// </summary><br /> public static readonly DependencyProperty IsExpandAllProperty =<br /> DependencyProperty.Register(“IsExpandAll”, typeof(bool), typeof(ComboBoxTree), new PropertyMetadata(true));<br /> /// <summary><br /> /// 设置TreeView打开时是全部打开状态还是收缩状态 默认为True打开状态<br /> /// </summary><br /> public bool IsExpandAll<br /> {<br /> get<br /> {<br /> return (bool)this.GetValue(IsExpandAllProperty);<br /> }<br /> set<br /> {<br /> this.SetValue(IsExpandAllProperty, value);<br /> }<br /> }</p> <p> #endregion</p> <p> #region 加载数据源方法</p> <p> /// <summary><br /> /// 用列表的方式加载数据源<br /> /// </summary><br /> private void LoadTreeViewDataWithList()<br /> {<br /> tvList.Items.Clear();//先清空所有的数据</p> <p> foreach (var item in ItemsSource)<br /> {<br /> Type objType = item.GetType();</p> <p> //–用反射的方式 获得属性对应的值<br /> PropertyInfo displayMemberInfo = objType.GetProperty(this.DisplayMemberPath);<br /> PropertyInfo selectedValueInfo = objType.GetProperty(this.SelectedValuePath);</p> <p> //–当前要显示的文本<br /> string displayText = displayMemberInfo.GetValue(item, null).ToString();<br /> //–当前选择的值<br /> string selectedValue = selectedValueInfo.GetValue(item, null).ToString();</p> <p> TreeViewItem myitem = new TreeViewItem();<br /> myitem.Header = displayText;<br /> myitem.Tag = selectedValue;</p> <p> tvList.Items.Add(myitem);<br /> }</p> <p> }</p> <p> /// <summary><br /> /// 用递归加载数据源<br /> /// </summary><br /> private void LoadTreeViewDataWithRecursion()<br /> {<br /> tvList.Items.Clear();//先清空所有的数据</p> <p> if (ItemsSource != null)<br /> {<br /> //—如果子级和父级属性设置不为空 则开始递归加载数据<br /> if (string.IsNullOrEmpty(this.ChildMemberPath) || string.IsNullOrEmpty(this.ParentMemberPath))<br /> {<br /> MessageBox.Show(“在【ComboBoxTree】控件中，如果启用了递归方式加载数据，必须设置【ChildMemberPath】和【ParentMemberPath】属性的值。”);<br /> }<br /> foreach (var item in ItemsSource)<br /> {<br /> Type objType = item.GetType();</p> <p> //–用反射的方式 获得属性对应的值<br /> PropertyInfo displayMemberInfo = objType.GetProperty(this.DisplayMemberPath);<br /> PropertyInfo selectedValueInfo = objType.GetProperty(this.SelectedValuePath);<br /> PropertyInfo childValueInfo = objType.GetProperty(this.ChildMemberPath);<br /> PropertyInfo parentValueInfo = objType.GetProperty(this.ParentMemberPath);</p> <p> //–当前要显示的文本<br /> string displayText = displayMemberInfo.GetValue(item, null).ToString();<br /> //–当前选择的值<br /> string selectedValue = selectedValueInfo.GetValue(item, null).ToString();<br /> //—子级绑定的值<br /> string childValue = childValueInfo.GetValue(item, null).ToString();<br /> //–父级绑定的值<br /> string parentValue = parentValueInfo.GetValue(item, null).ToString();</p> <p> if (string.IsNullOrEmpty(childValue) || string.IsNullOrEmpty(parentValue))<br /> {<br /> return;<br /> }<br /> if (parentValue == “0”)//–所有的父级的值为【0】的数据默认为添加到根节点。<br /> {<br /> TreeViewItem myitem = new TreeViewItem();<br /> myitem.Header = displayText;<br /> myitem.Tag = selectedValue;<br /> this.LoadItems(myitem, ItemsSource);</p> <p> tvList.Items.Add(myitem);<br /> }<br /> }<br /> }<br /> }<br /> /// <summary><br /> /// 递归加载数据源<br /> /// </summary><br /> /// <param name=”treeviewitem”></param><br /> /// <param name=”mylist”></param><br /> private void LoadItems(TreeViewItem treeviewitem, IEnumerable mylist)<br /> {<br /> if (mylist != null)<br /> {<br /> foreach (var item in ItemsSource)<br /> {<br /> Type objType = item.GetType();</p> <p> //–用反射的方式 获得属性对应的值<br /> PropertyInfo displayMemberInfo = objType.GetProperty(this.DisplayMemberPath);<br /> PropertyInfo selectedValueInfo = objType.GetProperty(this.SelectedValuePath);<br /> PropertyInfo childValueInfo = objType.GetProperty(this.ChildMemberPath);<br /> PropertyInfo parentValueInfo = objType.GetProperty(this.ParentMemberPath);</p> <p> //–当前要显示的文本<br /> string displayText = displayMemberInfo.GetValue(item, null).ToString();<br /> //–当前选择的值<br /> string selectedValue = selectedValueInfo.GetValue(item, null).ToString();<br /> //—子级绑定的值<br /> string childValue = childValueInfo.GetValue(item, null).ToString();<br /> //–父级绑定的值<br /> string parentValue = parentValueInfo.GetValue(item, null).ToString();</p> <p> if (string.IsNullOrEmpty(childValue) || string.IsNullOrEmpty(parentValue))<br /> {<br /> return;<br /> }<br /> if (treeviewitem.Tag.ToString() == parentValue)<br /> {<br /> TreeViewItem myitem = new TreeViewItem();<br /> myitem.Header = displayText;<br /> myitem.Tag = selectedValue;</p> <p> treeviewitem.Items.Add(myitem);</p> <p> this.LoadItems(myitem, ItemsSource);<br /> }<br /> }<br /> }<br /> }<br /> #endregion</p> <p> /// <summary><br /> /// TreeView的选择事件<br /> /// </summary><br /> /// <param name=”sender”></param><br /> /// <param name=”e”></param><br /> private void tvList_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)<br /> {<br /> if (tvList.Items.Count > 0)<br /> {<br /> this.SelectedItem = tvList.SelectedItem;</p> <p> if (string.IsNullOrEmpty(this.DisplayMemberPath) || string.IsNullOrEmpty(this.SelectedValuePath))<br /> {<br /> MessageBox.Show(“此控件必须设置【DisplayMemberPath】和【SelectedValuePath】属性的值”);<br /> return;<br /> }</p> <p> Type objType = null;<br /> PropertyInfo displayMemberInfo = null;<br /> PropertyInfo selectedValueInfo = null;</p> <p> foreach (var item in ItemsSource)<br /> {<br /> //获取实体的类型<br /> objType = item.GetType();<br /> //–用反射的方式 获得属性对应的值<br /> displayMemberInfo = objType.GetProperty(this.DisplayMemberPath);<br /> selectedValueInfo = objType.GetProperty(this.SelectedValuePath);</p> <p> break;<br /> }</p> <p> TreeViewItem treeviewitem = tvList.SelectedItem as TreeViewItem;</p> <p> //–当前要显示的文本<br /> string displayText = treeviewitem.Header.ToString();<br /> //–当前选择的值<br /> this.SelectedValue = treeviewitem.Tag.ToString();</p> <p> cbItemDisplay.Content = displayText;//设置ComboBox要显示的文本</p> <p> //设置当前选择的项<br /> foreach (var item in ItemsSource)<br /> {<br /> string selvalue = selectedValueInfo.GetValue(item, null).ToString();<br /> if (!string.IsNullOrEmpty(selvalue))<br /> {<br /> if (treeviewitem.Tag.ToString() == selvalue)<br /> {<br /> this.SelectedItem = item; ;<br /> }<br /> }<br /> }<br /> }<br /> }</p> <p> private void cbMain_DropDownOpened(object sender, EventArgs e)<br /> {<br /> //–打开时 隐藏要显示的项<br /> cbItemDisplay.Visibility = System.Windows.Visibility.Collapsed;<br /> cbItemTreeView.Visibility = System.Windows.Visibility.Visible;<br /> }</p> <p> private void cbMain_DropDownClosed(object sender, EventArgs e)<br /> {<br /> //–关闭时，使显示的项可见<br /> cbItemDisplay.Visibility = System.Windows.Visibility.Visible;<br /> cbItemTreeView.Visibility = System.Windows.Visibility.Collapsed;</p> <p> cbMain.SelectedItem = cbItemDisplay;//设置当前的选中项为显示项<br /> }</p> <p> }<br /> }<br />