基于WPF怎么实现筛选下拉多选控件

今天主机评测网小编给大家分享一下基于WPF怎么实现筛选下拉多选控件的相关知识点，内容详细，逻辑清晰，相信大部分人都还太了解这方面的知识，所以分享这篇文章给大家参考一下，希望大家阅读完这篇文章后有所收获，下面我们一起来了解一下吧。

WPF 实现筛选下拉多选控件

• 框架使用.NET4 至 .NET6；

• Visual Studio 2023;

创建MultiSelectionSearcboBox继承Control.

模板中创建两个ListBox

• PART_Selector用来显示所有Item

• PART_SearchSelector用于记录筛选到的Item

Item继承ListBoxItem并将样式模板修改为CheckBox

解决Popup中IME不跟随TextBox问题

private static extern IntPtr SetFocus(IntPtr hWnd);

当TextBox中Text发生改变时通过循环Item中的GetProperty获取特定DisplayMemberPath属性，判断是否包含输入的SearchText值，如果包含则添加PART_SearchSelector中，当SelectionChanged事件更改时将修改PART_Selector中的内容。

实现代码

1）创建MultiSelectionSearcboBox.cs代码如下:

usingSystem;usingSystem.Collections;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Runtime.InteropServices;usingSystem.Windows;usingSystem.Windows.Controls;usingSystem.Windows.Controls.Primitives;usingSystem.Windows.Interop;namespaceWPFDevelopers.Controls{[TemplatePart(Name="PART_TextBox",Type=typeof(TextBox))][TemplatePart(Name="PART_Popup",Type=typeof(Popup))][TemplatePart(Name="PART_Selector",Type=typeof(ListBox))][TemplatePart(Name="PART_SelectAll",Type=typeof(CheckBox))][TemplatePart(Name="PART_SearchSelector",Type=typeof(ListBox))]publicclassMultiSelectionSearcboBox:Control{privateconststringTextBoxTemplateName="PART_TextBox";privateconststringPopupTemplateName="PART_Popup";privateconststringListBoxTemplateName="PART_Selector";privateconststringCheckBoxTemplateName="PART_SelectAll";privateconststringListBoxTemplateNameSearch="PART_SearchSelector";publicstaticreadonlyRoutedEventClosedEvent=EventManager.RegisterRoutedEvent("Closed",RoutingStrategy.Bubble,typeof(RoutedEventHandler),typeof(MultiSelectionSearcboBox));publicstaticreadonlyDependencyPropertyDisplayMemberPathProperty=DependencyProperty.Register("DisplayMemberPath",typeof(string),typeof(MultiSelectionSearcboBox),newPropertyMetadata(string.Empty));publicstaticreadonlyDependencyPropertySelectedValuePathProperty=DependencyProperty.Register("SelectedValuePath",typeof(string),typeof(MultiSelectionSearcboBox),newPropertyMetadata(string.Empty));publicstaticreadonlyDependencyPropertyTextProperty=DependencyProperty.Register("Text",typeof(string),typeof(MultiSelectionSearcboBox),newPropertyMetadata(string.Empty));publicstaticreadonlyDependencyPropertyItemsSourceProperty=DependencyProperty.Register("ItemsSource",typeof(IEnumerable),typeof(MultiSelectionSearcboBox),newPropertyMetadata());publicstaticreadonlyDependencyPropertyItemsSourceSearchProperty=DependencyProperty.Register("ItemsSourceSearch",typeof(IEnumerable),typeof(MultiSelectionSearcboBox),newPropertyMetadata());publicstaticreadonlyDependencyPropertySelectAllContentProperty=DependencyProperty.Register("SelectAllContent",typeof(object),typeof(MultiSelectionSearcboBox),newPropertyMetadata("全选"));publicstaticreadonlyDependencyPropertyIsSelectAllActiveProperty=DependencyProperty.Register("IsSelectAllActive",typeof(bool),typeof(MultiSelectionSearcboBox),newPropertyMetadata(false));publicstaticreadonlyDependencyPropertyDelimiterProperty=DependencyProperty.Register("Delimiter",typeof(string),typeof(MultiSelectionSearcboBox),newPropertyMetadata(";"));publicstaticreadonlyDependencyPropertyIsDropDownOpenProperty=DependencyProperty.Register("IsDropDownOpen",typeof(bool),typeof(MultiSelectionSearcboBox),newPropertyMetadata(false,OnIsDropDownOpenChanged));publicstaticreadonlyDependencyPropertyMaxDropDownHeightProperty=DependencyProperty.Register("MaxDropDownHeight",typeof(double),typeof(MultiSelectionSearcboBox),newUIPropertyMetadata(SystemParameters.PrimaryScreenHeight/3.0,OnMaxDropDownHeightChanged));publicstaticreadonlyDependencyPropertySelectedItemsProperty=DependencyProperty.Register("SelectedItems",typeof(IList),typeof(MultiSelectionSearcboBox),newFrameworkPropertyMetadata(null,FrameworkPropertyMetadataOptions.BindsTwoWayByDefault|FrameworkPropertyMetadataOptions.Journal,OnSelectedItemsChanged));publicstaticreadonlyDependencyPropertySearchWatermarkProperty=DependencyProperty.Register("SearchWatermark",typeof(string),typeof(MultiSelectionSearcboBox),newPropertyMetadata(string.Empty));privateCheckBox_checkBox;privateListBox_listBox;privateListBox_listBoxSearch;privatePopup_popup;privateTextBox_textBox;privateList<object>selectedItems;privateList<object>selectedList;privateList<object>selectedSearchList;privatestringtheLastText;staticMultiSelectionSearcboBox(){DefaultStyleKeyProperty.OverrideMetadata(typeof(MultiSelectionSearcboBox),newFrameworkPropertyMetadata(typeof(MultiSelectionSearcboBox)));}publicstringDelimiter{get=>(string)GetValue(DelimiterProperty);set=>SetValue(DelimiterProperty,value);}publicstringSelectedValuePath{get=>(string)GetValue(SelectedValuePathProperty);set=>SetValue(SelectedValuePathProperty,value);}publicstringDisplayMemberPath{get=>(string)GetValue(DisplayMemberPathProperty);set=>SetValue(DisplayMemberPathProperty,value);}publicstringText{get=>(string)GetValue(TextProperty);set=>SetValue(TextProperty,value);}publicIEnumerableItemsSource{get=>(IEnumerable)GetValue(ItemsSourceProperty);set=>SetValue(ItemsSourceProperty,value);}publicIEnumerableItemsSourceSearch{get=>(IEnumerable)GetValue(ItemsSourceSearchProperty);set=>SetValue(ItemsSourceSearchProperty,value);}publicobjectSelectAllContent{get=>GetValue(SelectAllContentProperty);set=>SetValue(SelectAllContentProperty,value);}publicboolIsSelectAllActive{get=>(bool)GetValue(IsSelectAllActiveProperty);set=>SetValue(IsSelectAllActiveProperty,value);}publicboolIsDropDownOpen{get=>(bool)GetValue(IsDropDownOpenProperty);set=>SetValue(IsDropDownOpenProperty,value);}publicdoubleMaxDropDownHeight{get=>(double)GetValue(MaxDropDownHeightProperty);set=>SetValue(MaxDropDownHeightProperty,value);}publicIListSelectedItems{get=>(IList)GetValue(SelectedItemsProperty);set=>SetValue(SelectedItemsProperty,value);}publicstringSearchWatermark{get=>(string)GetValue(SearchWatermarkProperty);set=>SetValue(SearchWatermarkProperty,value);}[DllImport("User32.dll")]privatestaticexternIntPtrSetFocus(IntPtrhWnd);publiceventRoutedEventHandlerClosed{add=>AddHandler(ClosedEvent,value);remove=>RemoveHandler(ClosedEvent,value);}publicoverridevoidOnApplyTemplate(){base.OnApplyTemplate();selectedList=newList<object>();selectedSearchList=newList<object>();selectedItems=newList<object>();_textBox=GetTemplateChild(TextBoxTemplateName)asTextBox;_popup=GetTemplateChild(PopupTemplateName)asPopup;if(_popup!=null)_popup.GotFocus+=_popup_GotFocus;_listBox=GetTemplateChild(ListBoxTemplateName)asListBox;_checkBox=GetTemplateChild(CheckBoxTemplateName)asCheckBox;_listBoxSearch=GetTemplateChild(ListBoxTemplateNameSearch)asListBox;if(_textBox!=null){_textBox.TextChanged-=_textbox_TextChanged;_textBox.TextChanged+=_textbox_TextChanged;}if(_checkBox!=null){_checkBox.Checked-=_checkBox_Checked;_checkBox.Unchecked-=_checkBox_Unchecked;_checkBox.Checked+=_checkBox_Checked;_checkBox.Unchecked+=_checkBox_Unchecked;}if(_listBox!=null){_listBox.IsVisibleChanged-=_listBox_IsVisibleChanged;_listBox.IsVisibleChanged+=_listBox_IsVisibleChanged;_listBox.SelectionChanged-=_listBox_SelectionChanged;_listBox.SelectionChanged+=_listBox_SelectionChanged;}if(_listBoxSearch!=null){_listBoxSearch.IsVisibleChanged-=_listBoxSearch_IsVisibleChanged;_listBoxSearch.IsVisibleChanged+=_listBoxSearch_IsVisibleChanged;_listBoxSearch.SelectionChanged-=_listBoxSearch_SelectionChanged;_listBoxSearch.SelectionChanged+=_listBoxSearch_SelectionChanged;}}privatevoid_listBoxSearch_IsVisibleChanged(objectsender,DependencyPropertyChangedEventArgse){if((bool)e.NewValue)UpdateIsChecked(_listBoxSearch);}privatevoid_listBox_IsVisibleChanged(objectsender,DependencyPropertyChangedEventArgse){if((bool)e.NewValue){foreach(variteminselectedSearchList)if(!_listBox.SelectedItems.Contains(item))_listBox.SelectedItems.Add(item);UpdateIsChecked(_listBox);}}privatevoidUpdateIsChecked(ListBoxlistBox){_checkBox.Checked-=_checkBox_Checked;if(listBox.Items.Count>0&&listBox.Items.Count==listBox.SelectedItems.Count){if(_checkBox.IsChecked!=true)_checkBox.IsChecked=true;}else{if(listBox.SelectedItems.Count==0)_checkBox.IsChecked=false;else_checkBox.IsChecked=null;}_checkBox.Checked+=_checkBox_Checked;}privatevoid_popup_GotFocus(objectsender,RoutedEventArgse){varsource=(HwndSource)PresentationSource.FromVisual(_popup.Child);if(source!=null){SetFocus(source.Handle);_textBox.Focus();}}privatevoid_checkBox_Unchecked(objectsender,RoutedEventArgse){if(_listBoxSearch.Visibility==Visibility.Visible)_listBoxSearch.UnselectAll();else_listBox.UnselectAll();}privatevoid_checkBox_Checked(objectsender,RoutedEventArgse){if(_listBoxSearch.Visibility==Visibility.Visible)_listBoxSearch.SelectAll();else_listBox.SelectAll();}privatevoid&nbspbination(){varseletedName=newList<string>();foreach(varitemin_listBox.SelectedItems){varname=GetDisplayText(item);seletedName.Add(name);}foreach(varitemin_listBoxSearch.SelectedItems){if(_listBox.SelectedItems.Contains(item))continue;varname=GetDisplayText(item);seletedName.Add(name);}Text=string.Join(Delimiter,seletedName.ToArray());}privatevoid_listBox_SelectionChanged(objectsender,SelectionChangedEventArgse){if(e.RemovedItems.Count>0)foreach(varitemine.RemovedItems)if(_checkBox.IsChecked==true){_checkBox.Unchecked-=_checkBox_Unchecked;if(_listBox.Items.Count==1)_checkBox.IsChecked=false;else_checkBox.IsChecked=null;_checkBox.Unchecked+=_checkBox_Unchecked;}if(e.AddedItems.Count>0)SelectionChecked(_listBox);&nbspbination();SelectedItems=_listBox.SelectedItems;}privatevoid_listBoxSearch_SelectionChanged(objectsender,SelectionChangedEventArgse){if(!_listBoxSearch.IsVisible)return;if(e.RemovedItems.Count>0){foreach(varitemine.RemovedItems)if(selectedSearchList.Contains(item))selectedSearchList.Remove(item);&nbspbination();SelectionChecked(_listBoxSearch);}if(e.AddedItems.Count>0){foreach(varitemine.AddedItems)if(!selectedSearchList.Contains(item))selectedSearchList.Add(item);&nbspbination();SelectionChecked(_listBoxSearch);}}privatevoidSelectionChecked(ListBoxlistbox){if(listbox.SelectedItems.Count>0&&listbox.Items.Count==listbox.SelectedItems.Count){_checkBox.Checked-=_checkBox_Checked;_checkBox.IsChecked=true;_checkBox.Checked+=_checkBox_Checked;}else{_checkBox.Checked-=_checkBox_Checked;if(listbox.SelectedItems.Count>0&&listbox.Items.Count==listbox.SelectedItems.Count){if(_checkBox.IsChecked!=true)_checkBox.IsChecked=true;}else{if(listbox.SelectedItems.Count==0)_checkBox.IsChecked=false;else_checkBox.IsChecked=null;}_checkBox.Checked+=_checkBox_Checked;}}privatestringGetDisplayText(objectdataItem,stringpath=null){if(dataItem==null)returnstring.Empty;returnGetPropertyValue(dataItem);}privatevoid_textbox_TextChanged(objectsender,TextChangedEventArgse){if(string.IsNullOrWhiteSpace(theLastText))theLastText=_textBox.Text;SearchText(_textBox.Text);}privatevoidSearchText(string_text){vartext=_text;if(string.IsNullOrWhiteSpace(text)){if(_listBoxSearch.Visibility!=Visibility.Collapsed)_listBoxSearch.Visibility=Visibility.Collapsed;if(_listBox.Visibility!=Visibility.Visible)_listBox.Visibility=Visibility.Visible;}else{if(_listBoxSearch.Visibility!=Visibility.Visible)_listBoxSearch.Visibility=Visibility.Visible;if(_listBox.Visibility!=Visibility.Collapsed)_listBox.Visibility=Visibility.Collapsed;varlistSearch=newList<object>();foreach(varitemin_listBox.Items){varstr=GetPropertyValue(item);if(!string.IsNullOrWhiteSpace(str))if(str.Contains(text.ToUpperInvariant()))listSearch.Add(item);}foreach(variteminselectedList)if(!listSearch.Contains(item))listSearch.Add(item);varlastItem=ItemsSourceSearch;ItemsSourceSearch=listSearch;SelectionChecked(_listBoxSearch);selectedItems.Clear();foreach(varitemin_listBoxSearch.Items)if(_listBox.SelectedItems.Contains(item))if(!_listBoxSearch.SelectedItems.Contains(item))_listBoxSearch.SelectedItems.Add(item);}}privatestringGetPropertyValue(objectitem){varresult=string.Empty;varnameParts=DisplayMemberPath.Split('.');if(nameParts.Length==1){varproperty=item.GetType().GetProperty(DisplayMemberPath);if(property!=null)return(property.GetValue(item,null)??string.Empty).ToString();}returnresult.ToUpperInvariant();}privatestaticvoidOnIsDropDownOpenChanged(DependencyObjecto,DependencyPropertyChangedEventArgse){varmultiSelectionSearcboBox=oasMultiSelectionSearcboBox;if(multiSelectionSearcboBox!=null)multiSelectionSearcboBox.OnIsOpenChanged((bool)e.OldValue,(bool)e.NewValue);}protectedvirtualvoidOnIsOpenChanged(boololdValue,boolnewValue){if(!newValue)RaiseRoutedEvent(ClosedEvent);}privatevoidRaiseRoutedEvent(RoutedEventroutedEvent){varargs=newRoutedEventArgs(routedEvent,this);RaiseEvent(args);}privatestaticvoidOnMaxDropDownHeightChanged(DependencyObjecto,DependencyPropertyChangedEventArgse){var&nbspboBox=oasMultiSelectionSearcboBox;ifboBox!=null)&nbspboBox.OnMaxDropDownHeightChanged((double)e.OldValue,(double)e.NewValue);}protectedvirtualvoidOnMaxDropDownHeightChanged(doubleoldValue,doublenewValue){}privatestaticvoidOnSelectedItemsChanged(DependencyObjectd,DependencyPropertyChangedEventArgse){varmltiSelectionSearcboBox=dasMultiSelectionSearcboBox;if(e.NewValue!=null){varcollection=e.NewValueasIList;if(collection.Count<=0)return;if(e.OldValue!=null&&mltiSelectionSearcboBox._listBox!=null){mltiSelectionSearcboBox._listBox.SelectionChanged-=mltiSelectionSearcboBox._listBox_SelectionChanged;mltiSelectionSearcboBox._listBox.SelectedItems.Clear();}foreach(varitemincollection){varname=mltiSelectionSearcboBox.GetPropertyValue(item);varmodel=mltiSelectionSearcboBox._listBox.ItemsSource.OfType<object>().FirstOrDefault(h=>mltiSelectionSearcboBox.GetPropertyValue(h).ToUpperInvariant().Equals(name));if(model!=null&&!mltiSelectionSearcboBox._listBox.SelectedItems.Contains(item))mltiSelectionSearcboBox._listBox.SelectedItems.Add(model);if(e.OldValue!=null&&mltiSelectionSearcboBox._listBox!=null)mltiSelectionSearcboBox._listBox.SelectionChanged+=mltiSelectionSearcboBox._listBox_SelectionChanged;mltiSelectionSearcboBoxbination();}}}}}

2）创建MultiSelectionListBox.xaml代码如下:

usingSystem.Windows;usingSystem.Windows.Controls;namespaceWPFDevelopers.Controls{publicclassMultiSelectionListBox:ListBox{protectedoverrideboolIsItemItsOwnContainerOverride(objectitem){returnitemisMultiSelecboBoxItem;}protectedoverrideDependencyObjectGetContainerForItemOverride(){returnnewMultiSelecboBoxItem();}}}

3）创建MultiSelectionSearcboBox.xaml代码如下:

<ResourceDictionaryxmlns="schemas.microsoft/winfx/2006/xaml/presentation"xmlns:x="schemas.microsoft/winfx/2006/xaml"xmlns:controls="clr-namespace:WPFDevelopers.Controls"xmlns:helpers="clr-namespace:WPFDevelopers.Helpers"><ResourceDictionary.MergedDictionaries><ResourceDictionarySource="Basic/ControlBasic.xaml"/><ResourceDictionarySource="MultiSelectioboBox.xaml"/></ResourceDictionary.MergedDictionaries><StyleTargetType="{x:Typecontrols:MultiSelectionSearcboBox}"><SetterProperty="ScrollViewer.HorizontalScrollBarVisibility"Value="Auto"/><SetterProperty="ScrollViewer.VerticalScrollBarVisibility"Value="Auto"/><SetterProperty="ScrollViewer.CanContentScroll"Value="True"/><SetterProperty="MinWidth"Value="120"/><SetterProperty="MinHeight"Value="{StaticResourceMinHeight}"/><SetterProperty="Height"Value="{StaticResourceMinHeight}"/><SetterProperty="HorizontalContentAlignment"Value="Left"/><SetterProperty="VerticalContentAlignment"Value="Center"/><SetterProperty="BorderBrush"Value="{DynamicResourceBaseSolidColorBrush}"/><SetterProperty="BorderThickness"Value="1"/><SetterProperty="Background"Value="{DynamicResourceBackgroundSolidColorBrush}"/><SetterProperty="Padding"Value="14.5,3,30,3"/><SetterProperty="Template"><Setter.Value><ControlTemplateTargetType="{x:Typecontrols:MultiSelectionSearcboBox}"><ControlTemplate.Resources><Storyboardx:Key="OpenStoryboard"><DoubleAnimationStoryboard.TargetName="PART_DropDown"Storyboard.TargetProperty="(Grid.RenderTransform).(ScaleTransform.ScaleY)"To="1"Duration="00:00:.2"EasingFunction="{StaticResourceExponentialEaseOut}"/></Storyboard><Storyboardx:Key="CloseStoryboard"><DoubleAnimationStoryboard.TargetName="PART_DropDown"Storyboard.TargetProperty="(Grid.RenderTransform).(ScaleTransform.ScaleY)"To="0"Duration="00:00:.2"EasingFunction="{StaticResourceExponentialEaseOut}"/></Storyboard></ControlTemplate.Resources><controls:SmallPanelSnapsToDevicePixels="True"><BorderName="PART_Border"Background="{TemplateBindingBackground}"BorderBrush="{TemplateBindingBorderBrush}"BorderThickness="{TemplateBindingBorderThickness}"SnapsToDevicePixels="True"CornerRadius="{BindingPath=(helpers:ElementHelper.CornerRadius),RelativeSource={RelativeSourceTemplatedParent}}"/><ToggleButtonx:Name="PART_ToggleButton"Template="{StaticResource&nbspboBoxToggleButton}"Style="{x:Null}"Focusable="False"ClickMode="Release"IsChecked="{BindingIsDropDownOpen,Mode=TwoWay,RelativeSource={RelativeSourceTemplatedParent}}"/><TextBoxName="PART_EditableTextBox"Template="{StaticResource&nbspboBoxTextBox}"HorizontalAlignment="{TemplateBindingHorizontalContentAlignment}"VerticalAlignment="{TemplateBindingVerticalContentAlignment}"Margin="{TemplateBindingPadding}"Focusable="True"Foreground="{DynamicResourcePrimaryTextSolidColorBrush}"Text="{BindingText,RelativeSource={RelativeSourceTemplatedParent},Mode=TwoWay}"Background="{TemplateBindingBackground}"SelectionBrush="{DynamicResourceWindowBorderBrushSolidColorBrush}"IsReadOnly="True"Style="{x:Null}"/><TextBlockx:Name="PART_Watermark"Text="{BindingPath=(helpers:ElementHelper.Watermark),RelativeSource={RelativeSourceTemplatedParent}}"Foreground="{DynamicResourceRegularTextSolidColorBrush}"HorizontalAlignment="{TemplateBindingHorizontalContentAlignment}"VerticalAlignment="{TemplateBindingVerticalContentAlignment}"FontSize="{StaticResourceNormalFontSize}"Margin="{TemplateBindingPadding}"Background="Transparent"TextTrimming="CharacterEllipsis"IsHitTestVisible="False"Padding="1,0"Visibility="Collapsed"/><Popupx:Name="PART_Popup"AllowsTransparency="True"PlacementTarget="{BindingElementName=PART_ToggleButton}"IsOpen="{BindingIsDropDownOpen,RelativeSource={RelativeSourceTemplatedParent},Mode=TwoWay}"Placement="Bottom"StaysOpen="False"><controls:SmallPanelx:Name="PART_DropDown"MinWidth="{TemplateBindingFrameworkElement.ActualWidth}"Margin="24,2,24,24"MaxHeight="{TemplateBindingMaxDropDownHeight}"RenderTransformOrigin=".5,0"SnapsToDevicePixels="True"><controls:SmallPanel.RenderTransform><ScaleTransformScaleY="0"/></controls:SmallPanel.RenderTransform><BorderName="PART_DropDownBorder"Background="{TemplateBindingBackground}"BorderBrush="{TemplateBindingBorderBrush}"BorderThickness="{TemplateBindingBorderThickness}"SnapsToDevicePixels="True"CornerRadius="{BindingPath=(helpers:ElementHelper.CornerRadius),RelativeSource={RelativeSourceTemplatedParent}}"UseLayoutRounding="True"Effect="{StaticResourcePopupShadowDepth}"/><GridClipToBounds="False"Margin="0,8"><Grid.RowDefinitions><RowDefinitionHeight="Auto"/><RowDefinitionHeight="Auto"/><RowDefinition/></Grid.RowDefinitions><TextBoxx:Name="PART_TextBox"Margin="6,0"helpers:ElementHelper.Watermark="{BindingSearchWatermark,RelativeSource={RelativeSourceTemplatedParent}}"/><CheckBoxx:Name="PART_SelectAll"Grid.Row="1"Margin="5,4"Visibility="{TemplateBindingIsSelectAllActive,Converter={StaticResourcebool2VisibilityConverter}}"Content="{TemplateBindingSelectAllContent}"/><controls:MultiSelectListBoxx:Name="PART_Selector"Grid.Row="2"BorderThickness="1,0,1,0"DisplayMemberPath="{TemplateBindingDisplayMemberPath}"SelectedValuePath="{TemplateBindingSelectedValuePath}"MinHeight="{TemplateBindingMinHeight}"ItemsSource="{TemplateBindingItemsSource}"SelectionMode="Multiple"VerticalContentAlignment="{TemplateBindingVerticalContentAlignment}"HorizontalContentAlignment="{TemplateBindingHorizontalContentAlignment}"ItemContainerStyle="{StaticResourceDefaultMultiSelecboBoxItem}"ScrollViewer.HorizontalScrollBarVisibility="{BindingScrollViewer.HorizontalScrollBarVisibility,RelativeSource={RelativeSourceTemplatedParent}}"ScrollViewer.CanContentScroll="{BindingScrollViewer.CanContentScroll,RelativeSource={RelativeSourceTemplatedParent}}"BorderBrush="{TemplateBindingBorderBrush}"></controls:MultiSelectListBox><controls:MultiSelectListBoxx:Name="PART_SearchSelector"Grid.Row="2"BorderThickness="1,0,1,0"BorderBrush="{TemplateBindingBorderBrush}"DisplayMemberPath="{TemplateBindingDisplayMemberPath}"SelectedValuePath="{TemplateBindingSelectedValuePath}"MinHeight="{TemplateBindingMinHeight}"ItemsSource="{TemplateBindingItemsSourceSearch}"SelectionMode="Multiple"VerticalContentAlignment="{TemplateBindingVerticalContentAlignment}"HorizontalContentAlignment="{TemplateBindingHorizontalContentAlignment}"ItemContainerStyle="{StaticResourceDefaultMultiSelecboBoxItem}"ScrollViewer.HorizontalScrollBarVisibility="{BindingScrollViewer.HorizontalScrollBarVisibility,RelativeSource={RelativeSourceTemplatedParent}}"ScrollViewer.CanContentScroll="{BindingScrollViewer.CanContentScroll,RelativeSource={RelativeSourceTemplatedParent}}"Visibility="Collapsed"></controls:MultiSelectListBox></Grid></controls:SmallPanel></Popup></controls:SmallPanel><ControlTemplate.Triggers><TriggerSourceName="PART_ToggleButton"Property="IsChecked"Value="True"><Trigger.EnterActions><BeginStoryboardx:Name="BeginStoryboardOpenStoryboard"Storyboard="{StaticResourceOpenStoryboard}"/></Trigger.EnterActions><Trigger.ExitActions><StopStoryboardBeginStoryboardName="BeginStoryboardOpenStoryboard"/></Trigger.ExitActions></Trigger><TriggerSourceName="PART_ToggleButton"Property="IsChecked"Value="False"><Trigger.EnterActions><BeginStoryboardx:Name="BeginStoryboardCloseStoryboard"Storyboard="{StaticResourceCloseStoryboard}"/></Trigger.EnterActions><Trigger.ExitActions><StopStoryboardBeginStoryboardName="BeginStoryboardCloseStoryboard"/></Trigger.ExitActions></Trigger><TriggerProperty="IsMouseOver"Value="True"><SetterProperty="BorderBrush"TargetName="PART_Border"Value="{DynamicResourcePrimaryNormalSolidColorBrush}"/></Trigger><TriggerSourceName="PART_Popup"Property="AllowsTransparency"Value="True"><SetterTargetName="PART_DropDownBorder"Property="Margin"Value="0,2,0,0"/></Trigger><TriggerProperty="Text"Value=""><SetterProperty="Visibility"TargetName="PART_Watermark"Value="Visible"/></Trigger><TriggerProperty="Text"Value="{x:Null}"><SetterProperty="Visibility"TargetName="PART_Watermark"Value="Visible"/></Trigger></ControlTemplate.Triggers></ControlTemplate></Setter.Value></Setter></Style></ResourceDictionary>

4）创建MultiSelectSearcboBoxExample.xaml代码如下:

<Grid><Grid.RowDefinitions><RowDefinitionHeight="Auto"/><RowDefinition/></Grid.RowDefinitions><ButtonContent="获取选中"VerticalAlignment="Bottom"HorizontalAlignment="Center"Click="Button_Click"Margin="0,20,0,0"Style="{StaticResourceSuccessPrimaryButton}"/><UniformGridColumns="2"Rows="2"Grid.Row="1"><wd:MultiSelectionSearcboBoxVerticalContentAlignment="Center"HorizontalAlignment="Center"ItemsSource="{BindingDrawings}"DisplayMemberPath="Number"SelectedValuePath="Index"Width="200"Delimiter=","IsSelectAllActive="True"><wd:MultiSelectionSearcboBox.DataContext><vm:DrawingExampleVM/></wd:MultiSelectionSearcboBox.DataContext></wd:MultiSelectionSearcboBox><wd:MultiSelectionSearcboBoxName="MyMultiSelectionSearcboBox2"VerticalContentAlignment="Center"HorizontalAlignment="Center"ItemsSource="{BindingDrawings}"DisplayMemberPath="Number"SelectedValuePath="Index"Width="200"Delimiter="^"IsSelectAllActive="True"wd:ElementHelper.Watermark="MultiSelectionSearcboBox"SearchWatermark="请输入搜索内容"><wd:MultiSelectionSearcboBox.DataContext><vm:DrawingExampleVM/></wd:MultiSelectionSearcboBox.DataContext></wd:MultiSelectionSearcboBox></UniformGrid></Grid>

5）创建MultiSelectSearcboBoxExample.xaml.cs代码如下:

usingSystem.Windows;usingSystem.Windows.Controls;namespaceWPFDevelopers.Samples.ExampleViews{///<summary>///MultiSelecboBoxExample.xaml的交互逻辑///</summary>publicpartialclassMultiSelectSearcboBoxExample:UserControl{publicMultiSelectSearcboBoxExample(){Initializponent();}privatevoidButton_Click(objectsender,System.Windows.RoutedEventArgse){WPFDevelopers.Controls.MessageBox.Show($"{MyMultiSelectionSearcboBox2.Text}\r\n总共选中:{MyMultiSelectionSearcboBox2.SelectedItems.Count}条","选中内容",MessageBoxButton.OK,MessageBoxImage.Information);}}}

效果图

以上就是“基于WPF怎么实现筛选下拉多选控件”这篇文章的所有内容，感谢各位的阅读！相信大家阅读完这篇文章都有很大的收获，小编每天都会为大家更新不同的知识，如果还想学习更多的知识，请关注主机评测网行业资讯频道。

上一篇：Android的Activity怎么应用

下一篇：PostgreSQL与MySQL优劣势是什么

---