一、ComboBox基本样式

ComboBox有两种状态，可编辑和不可编辑状态。通过设置IsEditable属性可以切换控件状态。

先看基本样式效果：

基本样式代码如下：

  1. <!--ComboBox-->
  2.         <!--ComBoBox项选中背景色-->
  3.         <SolidColorBrush x:Key="ComboBoxSelectdBackground" Color="#ff8c69"/>
  4.         <!--ComBoBox项鼠标经过背景色-->
  5.         <SolidColorBrush x:Key="ComboBoxMouseOverBackground" Color="#ff3030"/>
  6.         <!--ComBoBox项选中前景色-->
  7.         <SolidColorBrush x:Key="ComboBoxSelectedForeground" Color="White"/>
  8.         <!--ComBoBox项鼠标经过前景色-->
  9.         <SolidColorBrush x:Key="ComboBoxMouseOverForegrond" Color="White"/>
  10.         <Style TargetType="{x:Type ComboBox}">
  11.             <Setter Property="ItemContainerStyle">
  12.                 <Setter.Value>
  13.                     <Style TargetType="ComboBoxItem">
  14.                         <Setter Property="Height" Value="20"/>
  15.                         <Setter Property="Template">
  16.                             <Setter.Value>
  17.                                 <ControlTemplate  TargetType="{x:Type ComboBoxItem}">
  18.                                     <Grid Height="{TemplateBinding Height}" Width="{TemplateBinding Width}">
  19.                                         <Border x:Name="_borderbg" Background="Transparent"/>
  20.                                         <TextBlock Margin="3 0 3 0" VerticalAlignment="Center" x:Name="_txt" Foreground="#333" Text="{Binding Content,RelativeSource={RelativeSource TemplatedParent}}"/>
  21.                                         <Border x:Name="_border" Background="White" Opacity="0"/>
  22.                                     </Grid>
  23.                                     <ControlTemplate.Triggers>
  24.                                         <Trigger Property="IsSelected" Value="true">
  25.                                             <Setter TargetName="_borderbg" Property="Background" Value="{StaticResource ComboBoxSelectdBackground}" />
  26.                                             <Setter TargetName="_txt" Property="Foreground" Value="{StaticResource ComboBoxSelectedForeground}"/>
  27.                                         </Trigger>
  28.                                         <MultiTrigger>
  29.                                             <MultiTrigger.Conditions>
  30.                                                 <Condition Property="IsSelected" Value="false"/>
  31.                                                 <Condition Property="IsMouseOver" Value="true"/>
  32.                                             </MultiTrigger.Conditions>
  33.                                             <Setter TargetName="_borderbg" Property="Background" Value="{StaticResource ComboBoxMouseOverBackground}" />
  34.                                             <Setter TargetName="_txt" Property="Foreground" Value="{StaticResource ComboBoxMouseOverForegrond}"/>
  35.                                         </MultiTrigger>
  36.  
  37.                                     </ControlTemplate.Triggers>
  38.                                 </ControlTemplate>
  39.                             </Setter.Value>
  40.                         </Setter>
  41.                     </Style>
  42.                 </Setter.Value>
  43.             </Setter>
  44.             <Setter Property="Template">
  45.                 <Setter.Value>
  46.                     <ControlTemplate TargetType="{x:Type ComboBox}">
  47.                         <Grid>
  48.  
  49.                             <Grid.ColumnDefinitions>
  50.                                 <ColumnDefinition Width="0.7*"/>
  51.                                 <ColumnDefinition Width="0.3*" MaxWidth="30"/>
  52.                             </Grid.ColumnDefinitions>
  53.                             <Border  Grid.Column="0" Grid.ColumnSpan="2" BorderThickness="1" BorderBrush="{TemplateBinding BorderBrush}" CornerRadius="1,0,0,1"/>
  54.                             <ContentPresenter HorizontalAlignment="Left" Margin="3,3,0,3" x:Name="ContentSite" VerticalAlignment="Center" Content="{TemplateBinding SelectionBoxItem}" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" IsHitTestVisible="False"/>
  55.  
  56.                             <!--ToggleButton 已数据绑定到 ComboBox 本身以切换 IsDropDownOpen-->
  57.                             <ToggleButton Grid.Column="0"  Grid.ColumnSpan="2"  Template="{StaticResource ComboBoxToggleButton}" x:Name="ToggleButton" Focusable="false" IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press"/>
  58.                             <!--必须将 TextBox 命名为 PART_EditableTextBox，否则 ComboBox 将无法识别它-->
  59.                             <TextBox   Visibility="Hidden" BorderThickness="0"   Margin="2 0 0 0" x:Name="PART_EditableTextBox"  VerticalAlignment="Center" Focusable="True" Background="Transparent" IsReadOnly="{TemplateBinding IsReadOnly}"/>
  60.  
  61.                             <!--Popup 可显示 ComboBox 中的项列表。IsOpen 已数据绑定到通过 ComboBoxToggleButton 来切换的 IsDropDownOpen-->
  62.                             <Popup IsOpen="{TemplateBinding IsDropDownOpen}" Placement="Bottom" x:Name="Popup" Focusable="False" AllowsTransparency="True" PopupAnimation="Slide">
  63.                                 <Grid MaxHeight="150" MinWidth="{TemplateBinding ActualWidth}" x:Name="DropDown" SnapsToDevicePixels="True">
  64.                                     <Border x:Name="DropDownBorder"  BorderBrush="#e8e8e8" BorderThickness="1 0 1 1"/>
  65.                                     <ScrollViewer Margin="1"  SnapsToDevicePixels="True" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" CanContentScroll="True">
  66.                                         <!--StackPanel 用于显示子级，方法是将 IsItemsHost 设置为 True-->
  67.                                         <StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" Background="White"/>
  68.                                     </ScrollViewer>
  69.                                 </Grid>
  70.                             </Popup>
  71.                         </Grid>
  72.                         <ControlTemplate.Triggers>
  73.                             <Trigger Property="IsEditable" Value="true">
  74.                                 <Setter TargetName="PART_EditableTextBox" Property="Visibility" Value="Visible" />
  75.                             </Trigger>
  76.                         </ControlTemplate.Triggers>
  77.                     </ControlTemplate>
  78.                 </Setter.Value>
  79.             </Setter>
  80.         </Style>

引用示例：

  1.  <ComboBox x:Name="combobox"  Width="150" Margin="10" IsEditable="False" BorderBrush="#e8e8e8">
  2.           <CheckBox Content="上海" Tag="1"></CheckBox>
  3.           <CheckBox Content="北京" Tag="2"></CheckBox>
  4.           <CheckBox Content="天津" Tag="3"></CheckBox>
  5.           <CheckBox Content="广州" Tag="4"></CheckBox>
  6. </ComboBox>

二、ComboBox扩展样式（多选控件）

ComBoBox能够单选选择数据，那么能不能实现多选的操作呢，答案是肯定的。这里多选的自定义控件参考了博主“梦里花落知多少”的内容。我对样式做了补充，使其能够更方便的进行移除多选的内容。同时也更好的展示了已选的内容，大家可以根据实际需求做出更好的展示效果。

先看效果：

2.1、添加自定义控件MultiComboBox

  1.  public class MultiComboBox : ComboBox
  2.     {
  3.         static MultiComboBox()
  4.         {
  5.             DefaultStyleKeyProperty.OverrideMetadata(typeof(MultiComboBox), new FrameworkPropertyMetadata(typeof(MultiComboBox)));
  6.         }
  7.  
  8.         private static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
  9.         {
  10.             d.SetValue(e.Property, e.NewValue);
  11.         }
  12.  
  13.         /// <summary>
  14.         /// 选中项列表
  15.         /// </summary>
  16.         public ObservableCollection<MultiCbxBaseData> ChekedItems
  17.         {
  18.             get { return (ObservableCollection<MultiCbxBaseData>)GetValue(ChekedItemsProperty); }
  19.             set { SetValue(ChekedItemsProperty, value); }
  20.         }
  21.  
  22.         public static readonly DependencyProperty ChekedItemsProperty =
  23.             DependencyProperty.Register("ChekedItems", typeof(ObservableCollection<MultiCbxBaseData>), typeof(MultiComboBox), new PropertyMetadata(new ObservableCollection<MultiCbxBaseData>(), OnPropertyChanged));
  24.  
  25.         /// <summary>
  26.         /// ListBox竖向列表
  27.         /// </summary>
  28.         private ListBox _ListBoxV;
  29.  
  30.         /// <summary>
  31.         /// ListBox横向列表
  32.         /// </summary>
  33.         private ListBox _ListBoxH;
  34.  
  35.         public override void OnApplyTemplate()
  36.         {
  37.             base.OnApplyTemplate();
  38.             _ListBoxV = Template.FindName("PART_ListBox", this) as ListBox;
  39.             _ListBoxH = Template.FindName("PART_ListBoxChk", this) as ListBox;
  40.             _ListBoxH.ItemsSource = ChekedItems;
  41.             _ListBoxV.SelectionChanged += _ListBoxV_SelectionChanged;
  42.             _ListBoxH.SelectionChanged += _ListBoxH_SelectionChanged;
  43.  
  44.             if (ItemsSource != null)
  45.             {
  46.                 foreach (var item in ItemsSource)
  47.                 {
  48.                     MultiCbxBaseData bdc = item as MultiCbxBaseData;
  49.                     if (bdc.IsCheck)
  50.                     {
  51.                         _ListBoxV.SelectedItems.Add(bdc);
  52.                     }
  53.                 }
  54.             }
  55.         }
  56.  
  57.         private void _ListBoxH_SelectionChanged(object sender, SelectionChangedEventArgs e)
  58.         {
  59.             foreach (var item in e.RemovedItems)
  60.             {
  61.                 MultiCbxBaseData datachk = item as MultiCbxBaseData;
  62.  
  63.                 for (int i = ; i < _ListBoxV.SelectedItems.Count; i++)
  64.                 {
  65.                     MultiCbxBaseData datachklist = _ListBoxV.SelectedItems[i] as MultiCbxBaseData;
  66.                     if (datachklist.ID == datachk.ID)
  67.                     {
  68.                         _ListBoxV.SelectedItems.Remove(_ListBoxV.SelectedItems[i]);
  69.                     }
  70.                 }
  71.             }
  72.         }
  73.  
  74.         void _ListBoxV_SelectionChanged(object sender, SelectionChangedEventArgs e)
  75.         {
  76.             foreach (var item in e.AddedItems)
  77.             {
  78.                 MultiCbxBaseData datachk = item as MultiCbxBaseData;
  79.                 datachk.IsCheck = true;
  80.                 if (ChekedItems.IndexOf(datachk) < )
  81.                 {
  82.                     ChekedItems.Add(datachk);
  83.                 }
  84.             }
  85.  
  86.             foreach (var item in e.RemovedItems)
  87.             {
  88.                 MultiCbxBaseData datachk = item as MultiCbxBaseData;
  89.                 datachk.IsCheck = false;
  90.                 ChekedItems.Remove(datachk);
  91.             }
  92.         }
  93.  
  94.         public class MultiCbxBaseData
  95.         {
  96.             private int _id;
  97.             /// <summary>
  98.             /// 关联主键
  99.             /// </summary>
  100.             public int ID
  101.             {
  102.                 get { return _id; }
  103.                 set { _id = value; }
  104.             }
  105.  
  106.             private string _viewName;
  107.             /// <summary>
  108.             /// 显示名称
  109.             /// </summary>
  110.             public string ViewName
  111.             {
  112.                 get { return _viewName; }
  113.                 set
  114.                 {
  115.                     _viewName = value;
  116.                 }
  117.             }
  118.  
  119.             private bool _isCheck;
  120.             /// <summary>
  121.             /// 是否选中
  122.             /// </summary>
  123.             public bool IsCheck
  124.             {
  125.                 get { return _isCheck; }
  126.                 set { _isCheck = value;}
  127.             }
  128.         }
  129.     }

2.2、定义MultiComboBox控件的样式

  1.  <ControlTemplate x:Key="ComboBoxToggleButton" TargetType="{x:Type ToggleButton}">
  2.         <Grid Height="25">
  3.             <Border Grid.Column="1" Background="White" Opacity="0"   Cursor="Hand"/>
  4.             <Path x:Name="Arrow" Grid.Column="1"   Data="M 0 0  6 6 12 0 Z"  VerticalAlignment="Center" HorizontalAlignment="Center" Stretch="None" Fill="#B1B1B1" />
  5.         </Grid>
  6.         <ControlTemplate.Triggers>
  7.             <Trigger Property="IsChecked" Value="true">
  8.                 <Setter TargetName="Arrow" Property="RenderTransform">
  9.                     <Setter.Value>
  10.                         <RotateTransform   CenterX="6" CenterY="3" Angle="180"></RotateTransform>
  11.                     </Setter.Value>
  12.                 </Setter>
  13.                 <Setter TargetName="Arrow" Property="Margin" Value="0 0 0 2"/>
  14.             </Trigger>
  15.         </ControlTemplate.Triggers>
  16.     </ControlTemplate>
  17.  
  18.     <!--MultiComboBox普通样式-->
  19.     <Style  TargetType="{x:Type local:MultiComboBox}">
  20.         <Setter Property="Width" Value="200" />
  21.         <Setter Property="HorizontalContentAlignment" Value="Stretch" />
  22.         <Setter Property="VerticalContentAlignment" Value="Center" />
  23.         <Setter Property="SnapsToDevicePixels" Value="True" />
  24.         <Setter Property="MaxDropDownHeight" Value="400" />
  25.         <Setter Property="Template">
  26.             <Setter.Value>
  27.                 <ControlTemplate TargetType="{x:Type local:MultiComboBox}">
  28.                     <Grid>
  29.                         <Border x:Name="Bg" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"  Width="{TemplateBinding Width}" Height="{TemplateBinding Height}" BorderBrush="#eaeaea" BorderThickness="1"  >
  30.                             <Grid x:Name="PART_Root">
  31.  
  32.                                 <Grid x:Name="PART_InnerGrid" Margin="0">
  33.                                     <Grid.ColumnDefinitions>
  34.                                         <ColumnDefinition Width="*" />
  35.                                         <ColumnDefinition Width="0.3*" MaxWidth="30" />
  36.                                     </Grid.ColumnDefinitions>
  37.                                     <ListBox x:Name="PART_ListBoxChk"  SelectionMode="Multiple" BorderThickness="0" ScrollViewer.VerticalScrollBarVisibility="Disabled">
  38.                                         <ListBox.ItemsPanel>
  39.                                             <ItemsPanelTemplate>
  40.                                                 <VirtualizingStackPanel Orientation="Horizontal" VirtualizingStackPanel.IsVirtualizing="True" />
  41.                                             </ItemsPanelTemplate>
  42.                                         </ListBox.ItemsPanel>
  43.                                         <ListBox.ItemContainerStyle>
  44.                                             <Style TargetType="ListBoxItem">
  45.                                                 <Setter Property="BorderThickness" Value="0"/>
  46.                                                 <Setter Property="IsSelected" Value="True"/>
  47.                                                 <Setter Property="Template">
  48.                                                     <Setter.Value>
  49.                                                         <ControlTemplate TargetType="ListBoxItem">
  50.                                                             <CheckBox BorderThickness="0"  VerticalAlignment="Center" HorizontalAlignment="Center"  Content="{Binding ViewName}" IsChecked="{Binding Path=IsSelected,RelativeSource={RelativeSource TemplatedParent},Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"/>
  51.                                                         </ControlTemplate>
  52.                                                     </Setter.Value>
  53.                                                 </Setter>
  54.                                             </Style>
  55.                                         </ListBox.ItemContainerStyle>
  56.                                     </ListBox>
  57.  
  58.                                     <!--下拉按钮-->
  59.                                     <ToggleButton x:Name="PART_DropDownToggle" IsTabStop="False"
  60.                                          IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
  61.                                          Grid.Column="1" Template="{StaticResource ComboBoxToggleButton}" />
  62.                                 </Grid>
  63.                             </Grid>
  64.                         </Border>
  65.                         <!--弹出多选列表-->
  66.                         <Popup x:Name="PART_Popup" AllowsTransparency="True"  Focusable="False" StaysOpen="False"
  67.                                IsOpen="{Binding IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}"
  68.                                PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
  69.                             <Grid Width="{Binding ActualWidth, RelativeSource={RelativeSource TemplatedParent}}"  MaxHeight="{Binding MaxDropDownHeight, RelativeSource={RelativeSource TemplatedParent}}" >
  70.                                 <ListBox x:Name="PART_ListBox" SelectionMode="Multiple" BorderThickness="1 0 1 1" Background="White" ItemsSource="{Binding ItemsSource,RelativeSource={RelativeSource TemplatedParent}}"
  71.                                              MaxHeight="{TemplateBinding MaxDropDownHeight}" BorderBrush="#eaeaea"  >
  72.                                     <ListBox.ItemContainerStyle>
  73.                                         <Style  TargetType="ListBoxItem">
  74.                                             <Setter Property="Template">
  75.                                                 <Setter.Value>
  76.                                                     <ControlTemplate TargetType="{x:Type ListBoxItem}" >
  77.                                                         <Grid  Height="22">
  78.                                                             <Border x:Name="bg" BorderBrush="#eaeaea" BorderThickness="0"/>
  79.                                                             <ContentPresenter x:Name="content"  />
  80.                                                             <Border Background="White"  Opacity="0"/>
  81.                                                         </Grid>
  82.                                                         <ControlTemplate.Triggers>
  83.                                                             <Trigger Property="IsSelected" Value="True">
  84.                                                                 <Setter  TargetName="bg"  Property="Background" Value="#ADD6FF" />
  85.                                                             </Trigger>
  86.                                                             <MultiTrigger>
  87.                                                                 <MultiTrigger.Conditions>
  88.                                                                     <Condition Property="IsMouseOver" Value="true" />
  89.                                                                     <Condition Property="IsSelected" Value="false"/>
  90.                                                                 </MultiTrigger.Conditions>
  91.                                                                 <Setter TargetName="bg" Property="Background" Value="#009BDB" />
  92.                                                                 <Setter TargetName="bg" Property="Opacity" Value="0.7"/>
  93.                                                                 <Setter   Property="Foreground" Value="White" />
  94.                                                             </MultiTrigger>
  95.                                                             <Trigger Property="IsEnabled" Value="False">
  96.                                                                 <Setter TargetName="bg" Property="Opacity" Value="0.3" />
  97.                                                                 <Setter   Property="Foreground" Value="Gray" />
  98.                                                             </Trigger>
  99.                                                         </ControlTemplate.Triggers>
  100.                                                     </ControlTemplate>
  101.                                                 </Setter.Value>
  102.                                             </Setter>
  103.                                         </Style>
  104.                                     </ListBox.ItemContainerStyle>
  105.                                     <ListBox.ItemTemplate>
  106.                                         <DataTemplate>
  107.                                             <Grid>
  108.                                                 <CheckBox x:Name="chk" Visibility="Hidden"  IsChecked="{Binding IsCheck,Mode=TwoWay}" VerticalAlignment="Center"/>
  109.                                                 <CheckBox VerticalAlignment="Center"  Foreground="{Binding Foreground,RelativeSource={RelativeSource AncestorType=ListBoxItem}}" IsChecked="{Binding  RelativeSource={RelativeSource AncestorType=ListBoxItem},Path=IsSelected,Mode=TwoWay}"  Content="{Binding Path=ViewName}" />
  110.                                             </Grid>
  111.                                             <DataTemplate.Triggers>
  112.                                                 <DataTrigger   Binding="{Binding  RelativeSource={RelativeSource AncestorType=ListBoxItem},Path=IsSelected}" Value="true">
  113.                                                     <Setter  TargetName="chk"  Property="IsChecked" Value="true"/>
  114.                                                 </DataTrigger>
  115.                                                 <DataTrigger   Binding="{Binding  RelativeSource={RelativeSource AncestorType=ListBoxItem},Path=IsSelected}" Value="false">
  116.                                                     <Setter     TargetName="chk" Property="IsChecked" Value="false"/>
  117.                                                 </DataTrigger>
  118.                                             </DataTemplate.Triggers>
  119.                                         </DataTemplate>
  120.                                     </ListBox.ItemTemplate>
  121.                                 </ListBox>
  122.                             </Grid>
  123.                         </Popup>
  124.                     </Grid>
  125.  
  126.                 </ControlTemplate>
  127.             </Setter.Value>
  128.         </Setter>
  129.     </Style>

2.3、引用示例：

  1. <local:MultiComboBox x:Name="multiCmb" Margin="10" Width="200"/>

2.4、后台代码（初始化绑定数据）：

  1.   public partial class MainWindow : Window
  2.     {
  3.         public MainWindow()
  4.         {
  5.             InitializeComponent();
  6.             MultiComboBoxList = new ObservableCollection<MultiCbxBaseData>()
  7.             {
  8.                 new MultiCbxBaseData(){
  9.                     ID=,
  10.                     ViewName="张三",
  11.                     IsCheck=false
  12.                 },
  13.                 new MultiCbxBaseData(){
  14.                     ID=,
  15.                     ViewName="李四",
  16.                     IsCheck=false
  17.                 },
  18.                 new MultiCbxBaseData(){
  19.                     ID=,
  20.                     ViewName="王五",
  21.                     IsCheck=false
  22.                 },
  23.                 new MultiCbxBaseData(){
  24.                     ID=,
  25.                     ViewName="马六",
  26.                     IsCheck=false
  27.                 },
  28.                  new MultiCbxBaseData(){
  29.                     ID=,
  30.                     ViewName="赵七",
  31.                     IsCheck=false
  32.                 },
  33.             };
  34.             this.multiCmb.ItemsSource = MultiComboBoxList;
  35.         }
  36.  
  37.         private ObservableCollection<MultiCbxBaseData> MultiComboBoxList;
  38.     }

所有代码已经上传到github：https://github.com/cmfGit/WpfDemo.git

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