WPF實(shí)現(xiàn)篩選下拉多選控件的示例代碼
更新時(shí)間：2023年06月21日 09:07:15 作者：WPF開(kāi)發(fā)者
這篇文章主要為大家詳細(xì)介紹了WPF如何實(shí)現(xiàn)篩選下拉多選控件，文中的示例代碼講解詳細(xì)，對(duì)我們學(xué)習(xí)或工作有一定幫助，感興趣的小伙伴可以了解一下
修復(fù) Issue WPF 實(shí)現(xiàn)篩選下拉多選控件
框架使用.NET4 至 .NET6；
Visual Studio 2022;
接著上一篇，MultiSelectionSearchComboBox 無(wú)法做到根據(jù)值選中選項(xiàng)，使用 Selecteditems 時(shí)會(huì)默認(rèn)選中集合中的最后一個(gè)切選項(xiàng)選擇功能會(huì)失效，這明顯是不對(duì)的issue.
因?yàn)橄惹暗?nbsp;OnSelectedItemsChanged 邏輯處理錯(cuò)誤，導(dǎo)致 Binding 多個(gè)選擇值只保留了最后一次，因?yàn)橹盀閷?duì) listBox.SelectionChanged 取消訂閱。
實(shí)現(xiàn)代碼
1）修改 MultiSelectionSearchComboBox.cs 代碼如下:
using?System;
using?System.Collections;
using?System.Collections.Generic;
using?System.Linq;
using?System.Runtime.InteropServices;
using?System.Windows;
using?System.Windows.Controls;
using?System.Windows.Controls.Primitives;
using?System.Windows.Interop;
using?WPFDevelopers.Helpers;
namespace?WPFDevelopers.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))]
????public?class?MultiSelectionSearchComboBox?:?Control
????{
????????private?const?string?TextBoxTemplateName?=?"PART_TextBox";
????????private?const?string?PopupTemplateName?=?"PART_Popup";
????????private?const?string?ListBoxTemplateName?=?"PART_Selector";
????????private?const?string?CheckBoxTemplateName?=?"PART_SelectAll";
????????private?const?string?ListBoxTemplateNameSearch?=?"PART_SearchSelector";
????????public?static?readonly?RoutedEvent?ClosedEvent?=
????????????EventManager.RegisterRoutedEvent("Closed",
????????????????RoutingStrategy.Bubble,
????????????????typeof(RoutedEventHandler),
????????????????typeof(MultiSelectionSearchComboBox));
????????public?static?readonly?DependencyProperty?DisplayMemberPathProperty?=
????????????DependencyProperty.Register("DisplayMemberPath",
????????????????typeof(string),
????????????????typeof(MultiSelectionSearchComboBox),
????????????????new?PropertyMetadata(string.Empty));
????????public?static?readonly?DependencyProperty?SelectedValuePathProperty?=
????????????DependencyProperty.Register("SelectedValuePath",
????????????????typeof(string),
????????????????typeof(MultiSelectionSearchComboBox),
????????????????new?PropertyMetadata(string.Empty));
????????public?static?readonly?DependencyProperty?TextProperty?=
????????????DependencyProperty.Register("Text",
????????????????typeof(string),
????????????????typeof(MultiSelectionSearchComboBox),
????????????????new?PropertyMetadata(string.Empty));
????????public?static?readonly?DependencyProperty?ItemsSourceProperty?=
????????????DependencyProperty.Register("ItemsSource",?typeof(IEnumerable),?typeof(MultiSelectionSearchComboBox),
????????????????new?PropertyMetadata());
????????public?static?readonly?DependencyProperty?ItemsSourceSearchProperty?=
????????????DependencyProperty.Register("ItemsSourceSearch",?typeof(IEnumerable),?typeof(MultiSelectionSearchComboBox),
????????????????new?PropertyMetadata());
????????public?static?readonly?DependencyProperty?SelectAllContentProperty?=
????????????DependencyProperty.Register("SelectAllContent",?typeof(object),?typeof(MultiSelectionSearchComboBox),
????????????????new?PropertyMetadata("全選"));
????????public?static?readonly?DependencyProperty?IsSelectAllActiveProperty?=
????????????DependencyProperty.Register("IsSelectAllActive",?typeof(bool),?typeof(MultiSelectionSearchComboBox),
????????????????new?PropertyMetadata(false));
????????public?static?readonly?DependencyProperty?DelimiterProperty?=
????????????DependencyProperty.Register("Delimiter",?typeof(string),?typeof(MultiSelectionSearchComboBox),
????????????????new?PropertyMetadata(";"));
????????public?static?readonly?DependencyProperty?IsDropDownOpenProperty?=
????????????DependencyProperty.Register("IsDropDownOpen",?typeof(bool),?typeof(MultiSelectionSearchComboBox),
????????????????new?PropertyMetadata(false,?OnIsDropDownOpenChanged));
????????public?static?readonly?DependencyProperty?MaxDropDownHeightProperty?=
????????????DependencyProperty.Register("MaxDropDownHeight",?typeof(double),?typeof(MultiSelectionSearchComboBox),
????????????????new?UIPropertyMetadata(SystemParameters.PrimaryScreenHeight?/?3.0,?OnMaxDropDownHeightChanged));
????????public?static?readonly?DependencyProperty?SelectedItemsProperty?=
????????????DependencyProperty.Register("SelectedItems",?typeof(IList),?typeof(MultiSelectionSearchComboBox),
????????????????new?FrameworkPropertyMetadata(null,
????????????????????FrameworkPropertyMetadataOptions.BindsTwoWayByDefault?|?FrameworkPropertyMetadataOptions.Journal,
????????????????????OnSelectedItemsChanged));
????????public?static?readonly?DependencyProperty?SearchWatermarkProperty?=
????????????DependencyProperty.Register("SearchWatermark",
????????????????typeof(string),
????????????????typeof(MultiSelectionSearchComboBox),
????????????????new?PropertyMetadata(string.Empty));
????????private?CheckBox?_checkBox;
????????private?ListBox?_listBox;
????????private?ListBox?_listBoxSearch;
????????private?Popup?_popup;
????????private?TextBox?_textBox;
????????private?List<object>?selectedItems;
????????private?List<object>?selectedList;
????????private?List<object>?selectedSearchList;
????????private?string?theLastText;
????????static?MultiSelectionSearchComboBox()
????????{
????????????DefaultStyleKeyProperty.OverrideMetadata(typeof(MultiSelectionSearchComboBox),
????????????????new?FrameworkPropertyMetadata(typeof(MultiSelectionSearchComboBox)));
????????}
????????public?string?Delimiter
????????{
????????????get?=>?(string)?GetValue(DelimiterProperty);
????????????set?=>?SetValue(DelimiterProperty,?value);
????????}
????????public?string?SelectedValuePath
????????{
????????????get?=>?(string)?GetValue(SelectedValuePathProperty);
????????????set?=>?SetValue(SelectedValuePathProperty,?value);
????????}
????????public?string?DisplayMemberPath
????????{
????????????get?=>?(string)?GetValue(DisplayMemberPathProperty);
????????????set?=>?SetValue(DisplayMemberPathProperty,?value);
????????}
????????public?string?Text
????????{
????????????get?=>?(string)?GetValue(TextProperty);
????????????set?=>?SetValue(TextProperty,?value);
????????}
????????public?IEnumerable?ItemsSource
????????{
????????????get?=>?(IEnumerable)?GetValue(ItemsSourceProperty);
????????????set?=>?SetValue(ItemsSourceProperty,?value);
????????}
????????public?IEnumerable?ItemsSourceSearch
????????{
????????????get?=>?(IEnumerable)?GetValue(ItemsSourceSearchProperty);
????????????set?=>?SetValue(ItemsSourceSearchProperty,?value);
????????}
????????public?object?SelectAllContent
????????{
????????????get?=>?GetValue(SelectAllContentProperty);
????????????set?=>?SetValue(SelectAllContentProperty,?value);
????????}
????????public?bool?IsSelectAllActive
????????{
????????????get?=>?(bool)?GetValue(IsSelectAllActiveProperty);
????????????set?=>?SetValue(IsSelectAllActiveProperty,?value);
????????}
????????public?bool?IsDropDownOpen
????????{
????????????get?=>?(bool)?GetValue(IsDropDownOpenProperty);
????????????set?=>?SetValue(IsDropDownOpenProperty,?value);
????????}
????????public?double?MaxDropDownHeight
????????{
????????????get?=>?(double)?GetValue(MaxDropDownHeightProperty);
????????????set?=>?SetValue(MaxDropDownHeightProperty,?value);
????????}
????????public?IList?SelectedItems
????????{
????????????get?=>?(IList)?GetValue(SelectedItemsProperty);
????????????set?=>?SetValue(SelectedItemsProperty,?value);
????????}
????????public?string?SearchWatermark
????????{
????????????get?=>?(string)?GetValue(SearchWatermarkProperty);
????????????set?=>?SetValue(SearchWatermarkProperty,?value);
????????}
????????[DllImport(Win32.User32)]
????????private?static?extern?IntPtr?SetFocus(IntPtr?hWnd);
????????public?event?RoutedEventHandler?Closed
????????{
????????????add?=>?AddHandler(ClosedEvent,?value);
????????????remove?=>?RemoveHandler(ClosedEvent,?value);
????????}
????????public?override?void?OnApplyTemplate()
????????{
????????????base.OnApplyTemplate();
????????????selectedList?=?new?List<object>();
????????????selectedSearchList?=?new?List<object>();
????????????selectedItems?=?new?List<object>();
????????????_textBox?=?GetTemplateChild(TextBoxTemplateName)?as?TextBox;
????????????_popup?=?GetTemplateChild(PopupTemplateName)?as?Popup;
????????????if?(_popup?!=?null)
????????????????_popup.GotFocus?+=?_popup_GotFocus;
????????????_listBox?=?GetTemplateChild(ListBoxTemplateName)?as?ListBox;
????????????_checkBox?=?GetTemplateChild(CheckBoxTemplateName)?as?CheckBox;
????????????_listBoxSearch?=?GetTemplateChild(ListBoxTemplateNameSearch)?as?ListBox;
????????????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;
????????????}
????????}
????????private?void?_listBoxSearch_IsVisibleChanged(object?sender,?DependencyPropertyChangedEventArgs?e)
????????{
????????????if?((bool)?e.NewValue)
????????????????UpdateIsChecked(_listBoxSearch);
????????}
????????private?void?_listBox_IsVisibleChanged(object?sender,?DependencyPropertyChangedEventArgs?e)
????????{
????????????if?((bool)?e.NewValue)
????????????{
????????????????foreach?(var?item?in?selectedSearchList)
????????????????????if?(!_listBox.SelectedItems.Contains(item))
????????????????????????_listBox.SelectedItems.Add(item);
????????????????UpdateIsChecked(_listBox);
????????????}
????????}
????????private?void?UpdateIsChecked(ListBox?listBox)
????????{
????????????_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;
????????}
????????private?void?_popup_GotFocus(object?sender,?RoutedEventArgs?e)
????????{
????????????var?source?=?(HwndSource)?PresentationSource.FromVisual(_popup.Child);
????????????if?(source?!=?null)
????????????{
????????????????SetFocus(source.Handle);
????????????????_textBox.Focus();
????????????}
????????}
????????private?void?_checkBox_Unchecked(object?sender,?RoutedEventArgs?e)
????????{
????????????if?(_listBoxSearch.Visibility?==?Visibility.Visible)
????????????????_listBoxSearch.UnselectAll();
????????????else
????????????????_listBox.UnselectAll();
????????}
????????private?void?_checkBox_Checked(object?sender,?RoutedEventArgs?e)
????????{
????????????if?(_listBoxSearch.Visibility?==?Visibility.Visible)
????????????????_listBoxSearch.SelectAll();
????????????else
????????????????_listBox.SelectAll();
????????}
????????private?void?Combination()
????????{
????????????var?seletedName?=?new?List<string>();
????????????foreach?(var?item?in?_listBox.SelectedItems)
????????????{
????????????????var?name?=?GetDisplayText(item);
????????????????if?(!string.IsNullOrWhiteSpace(name))
????????????????????seletedName.Add(name);
????????????????else
????????????????????seletedName.Add(item.ToString());
????????????}
????????????foreach?(var?item?in?_listBoxSearch.SelectedItems)
????????????{
????????????????if?(_listBox.SelectedItems.Contains(item))
????????????????????continue;
????????????????var?name?=?GetDisplayText(item);
????????????????if?(!string.IsNullOrWhiteSpace(name))
????????????????????seletedName.Add(name);
????????????????else
????????????????????seletedName.Add(item.ToString());
????????????}
????????????Text?=?string.Join(Delimiter,?seletedName.ToArray());
????????}
????????private?void?_listBox_SelectionChanged(object?sender,?SelectionChangedEventArgs?e)
????????{
????????????if?(e.RemovedItems.Count?>?0)
????????????{
????????????????foreach?(var?item?in?e.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?(_listBoxSearch.SelectedItems.Contains(item))
????????????????????????_listBoxSearch.SelectedItems.Remove(item);
????????????????????if?(selectedSearchList.Contains(item))
????????????????????????selectedSearchList.Remove(item);
????????????????}
????????????????SelectionChecked(_listBox);
????????????}
????????????if?(e.AddedItems.Count?>?0)
????????????????SelectionChecked(_listBox);
????????????Combination();
????????????SelectedItems?=?_listBox.SelectedItems;
????????}
????????private?void?_listBoxSearch_SelectionChanged(object?sender,?SelectionChangedEventArgs?e)
????????{
????????????if?(!_listBoxSearch.IsVisible)
????????????????return;
????????????if?(e.RemovedItems.Count?>?0)
????????????{
????????????????foreach?(var?item?in?e.RemovedItems)
????????????????{
????????????????????if?(selectedSearchList.Contains(item))
????????????????????????selectedSearchList.Remove(item);
????????????????????if?(_listBox.SelectedItems.Contains(item))
????????????????????????_listBox.SelectedItems.Remove(item);
????????????????????if?(selectedList.Contains(item))
????????????????????????selectedList.Remove(item);
????????????????}
????????????????Combination();
????????????????SelectionChecked(_listBoxSearch);
????????????}
????????????if?(e.AddedItems.Count?>?0)
????????????{
????????????????foreach?(var?item?in?e.AddedItems)
????????????????????if?(!selectedSearchList.Contains(item))
????????????????????????selectedSearchList.Add(item);
????????????????Combination();
????????????????SelectionChecked(_listBoxSearch);
????????????}
????????}
????????private?void?SelectionChecked(ListBox?listbox)
????????{
????????????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;
????????????}
????????}
????????private?string?GetDisplayText(object?dataItem,?string?path?=?null)
????????{
????????????if?(dataItem?==?null)?return?string.Empty;
????????????return?GetPropertyValue(dataItem);
????????}
????????private?void?_textbox_TextChanged(object?sender,?TextChangedEventArgs?e)
????????{
????????????if?(string.IsNullOrWhiteSpace(theLastText))?theLastText?=?_textBox.Text;
????????????SearchText(_textBox.Text);
????????}
????????private?void?SearchText(string?_text)
????????{
????????????var?text?=?_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;
????????????????var?listSearch?=?new?List<object>();
????????????????foreach?(var?item?in?_listBox.Items)
????????????????{
????????????????????var?str?=?GetPropertyValue(item);
????????????????????if?(string.IsNullOrWhiteSpace(str))
????????????????????????str?=?item.ToString();
????????????????????if?(!string.IsNullOrWhiteSpace(str))
????????????????????????if?(str.Contains(text.ToUpperInvariant()))
????????????????????????????listSearch.Add(item);
????????????????}
????????????????foreach?(var?item?in?selectedList)
????????????????????if?(!listSearch.Contains(item))
????????????????????????listSearch.Add(item);
????????????????var?lastItem?=?ItemsSourceSearch;
????????????????ItemsSourceSearch?=?listSearch;
????????????????SelectionChecked(_listBoxSearch);
????????????????selectedItems.Clear();
????????????????foreach?(var?item?in?_listBoxSearch.Items)
????????????????????if?(_listBox.SelectedItems.Contains(item))
????????????????????????if?(!_listBoxSearch.SelectedItems.Contains(item))
????????????????????????????_listBoxSearch.SelectedItems.Add(item);
????????????}
????????}
????????private?string?GetPropertyValue(object?item)
????????{
????????????var?result?=?string.Empty;
????????????var?nameParts?=?DisplayMemberPath.Split('.');
????????????if?(nameParts.Length?==?1)
????????????{
????????????????var?property?=?item.GetType().GetProperty(DisplayMemberPath);
????????????????if?(property?!=?null)
????????????????????return?(property.GetValue(item,?null)????string.Empty).ToString();
????????????}
????????????return?result.ToUpperInvariant();
????????}
????????private?static?void?OnIsDropDownOpenChanged(DependencyObject?o,?DependencyPropertyChangedEventArgs?e)
????????{
????????????var?multiSelectionSearchComboBox?=?o?as?MultiSelectionSearchComboBox;
????????????if?(multiSelectionSearchComboBox?!=?null)
????????????????multiSelectionSearchComboBox.OnIsOpenChanged((bool)?e.OldValue,?(bool)?e.NewValue);
????????}
????????protected?virtual?void?OnIsOpenChanged(bool?oldValue,?bool?newValue)
????????{
????????????if?(!newValue)
????????????????RaiseRoutedEvent(ClosedEvent);
????????}
????????private?void?RaiseRoutedEvent(RoutedEvent?routedEvent)
????????{
????????????var?args?=?new?RoutedEventArgs(routedEvent,?this);
????????????RaiseEvent(args);
????????}
????????private?static?void?OnMaxDropDownHeightChanged(DependencyObject?o,?DependencyPropertyChangedEventArgs?e)
????????{
????????????var?comboBox?=?o?as?MultiSelectionSearchComboBox;
????????????if?(comboBox?!=?null)
????????????????comboBox.OnMaxDropDownHeightChanged((double)?e.OldValue,?(double)?e.NewValue);
????????}
????????protected?virtual?void?OnMaxDropDownHeightChanged(double?oldValue,?double?newValue)
????????{
????????}
????????private?static?void?OnSelectedItemsChanged(DependencyObject?d,?DependencyPropertyChangedEventArgs?e)
????????{
????????????var?mltiSelectionSearchComboBox?=?d?as?MultiSelectionSearchComboBox;
????????????if?(e.NewValue?!=?null)
????????????{
????????????????var?collection?=?e.NewValue?as?IList;
????????????????if?(collection.Count?<=?0)?return;
????????????????mltiSelectionSearchComboBox._listBox.SelectionChanged?-=
????????????????????mltiSelectionSearchComboBox._listBox_SelectionChanged;
????????????????foreach?(var?item?in?collection)
????????????????{
????????????????????var?name?=?mltiSelectionSearchComboBox.GetPropertyValue(item);
????????????????????object?model?=?null;
????????????????????if?(!string.IsNullOrWhiteSpace(name))
????????????????????????model?=?mltiSelectionSearchComboBox._listBox.ItemsSource.OfType<object>().FirstOrDefault(h?=>
????????????????????????????mltiSelectionSearchComboBox.GetPropertyValue(h).ToUpperInvariant()
????????????????????????????????.Equals(name));
????????????????????else
????????????????????????model?=?mltiSelectionSearchComboBox._listBox.ItemsSource.OfType<object>()
????????????????????????????.FirstOrDefault(h?=>?h?==?item);
????????????????????if?(model?!=?null?&&?!mltiSelectionSearchComboBox._listBox.SelectedItems.Contains(item))
????????????????????????mltiSelectionSearchComboBox._listBox.SelectedItems.Add(model);
????????????????}
????????????????mltiSelectionSearchComboBox._listBox.SelectionChanged?+=
????????????????????mltiSelectionSearchComboBox._listBox_SelectionChanged;
????????????????mltiSelectionSearchComboBox.Combination();
????????????}
????????}
????}
}2）創(chuàng)建 MultiSelectSearchComboBoxExample.xaml 代碼如下:
1.使用 SelectedItems 進(jìn)行初始化選中
<UserControl
????x:Class="WPFDevelopers.Samples.ExampleViews.MultiSelectSearchComboBoxExample"
????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:local="clr-namespace:WPFDevelopers.Samples.ExampleViews"
????xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
????xmlns:model="clr-namespace:WPFDevelopers.Sample.Models"
????xmlns:vm="clr-namespace:WPFDevelopers.Samples.ViewModels"
????xmlns:wd="https://github.com/WPFDevelopersOrg/WPFDevelopers"
????d:DesignHeight="450"
????d:DesignWidth="800"
????mc:Ignorable="d">
????<UserControl.Resources>
????????<model:HospitalList?x:Key="myHospitalList"?/>
????</UserControl.Resources>
????????<Grid>
????????????<Grid.RowDefinitions>
????????????????<RowDefinition?Height="Auto"?/>
????????????????<RowDefinition?/>
????????????</Grid.RowDefinitions>
????????????<Button
????????????????Margin="0,20,0,0"
????????????????HorizontalAlignment="Center"
????????????????VerticalAlignment="Bottom"
????????????????Click="Button_Click"
????????????????Content="獲取選中"
????????????????Style="{StaticResource?WD.SuccessPrimaryButton}"?/>
????????????<UniformGrid
????????????????Grid.Row="1"
????????????????Columns="2"
????????????????Rows="2">
????????????????<wd:MultiSelectionSearchComboBox
????????????????????Width="200"
????????????????????HorizontalAlignment="Center"
????????????????????VerticalContentAlignment="Center"
????????????????????Delimiter=","
????????????????????DisplayMemberPath="Number"
????????????????????IsSelectAllActive="True"
????????????????????ItemsSource="{Binding?Drawings}"
????????????????????SelectedValuePath="Index">
????????????????????<wd:MultiSelectionSearchComboBox.DataContext>
????????????????????????<vm:DrawingExampleVM?/>
????????????????????</wd:MultiSelectionSearchComboBox.DataContext>
????????????????</wd:MultiSelectionSearchComboBox>
????????????????<wd:MultiSelectionSearchComboBox
????????????????????Width="200"
????????????????????HorizontalAlignment="Center"
????????????????????VerticalContentAlignment="Center"
????????????????????wd:ElementHelper.Watermark="MultiSelectionSearchComboBox"
????????????????????Delimiter="^"
????????????????????DisplayMemberPath="Number"
????????????????????IsSelectAllActive="True"
????????????????????ItemsSource="{Binding?Drawings}"
????????????????????SearchWatermark="請(qǐng)輸入搜索內(nèi)容"
????????????????????SelectedValuePath="Index">
????????????????????<wd:MultiSelectionSearchComboBox.DataContext>
????????????????????????<vm:DrawingExampleVM?/>
????????????????????</wd:MultiSelectionSearchComboBox.DataContext>
????????????????</wd:MultiSelectionSearchComboBox>
????????????????<wd:MultiSelectionSearchComboBox
????????????????????Name="MyMultiSelectionSearchComboBox2"
????????????????????Width="200"
????????????????????HorizontalAlignment="Center"
????????????????????VerticalContentAlignment="Center"
????????????????????wd:ElementHelper.Watermark="下拉多選搜索"
????????????????????Delimiter="^"
????????????????????IsSelectAllActive="True"
????????????????????SearchWatermark="請(qǐng)輸入搜索內(nèi)容">
????????????????????<wd:MultiSelectionSearchComboBox.DataContext>
????????????????????????<vm:DrawingExampleVM?/>
????????????????????</wd:MultiSelectionSearchComboBox.DataContext>
????????????????</wd:MultiSelectionSearchComboBox>
????????????</UniformGrid>
????????</Grid>
</UserControl>3）創(chuàng)建 MultiSelectSearchComboBoxExample.xaml.cs 代碼如下:
using?ICSharpCode.AvalonEdit.Document;
using?System.Collections.Generic;
using?System.Linq;
using?System.Windows;
using?System.Windows.Controls;
namespace?WPFDevelopers.Samples.ExampleViews
{
????///?<summary>
????///?MultiSelectComboBoxExample.xaml?的交互邏輯
????///?</summary>
????public?partial?class?MultiSelectSearchComboBoxExample?:?UserControl
????{
????????public?MultiSelectSearchComboBoxExample()
????????{
????????????InitializeComponent();
????????????Loaded?+=?MultiSelectSearchComboBoxExample_Loaded;
????????}
????????private?void?MultiSelectSearchComboBoxExample_Loaded(object?sender,?RoutedEventArgs?e)
????????{
????????????var?list?=?new?List<string>();
????????????for?(int?i?=?0;?i?<?10;?i++)
????????????????list.Add(i.ToString());
????????????MyMultiSelectionSearchComboBox2.ItemsSource?=?list;
????????????MyMultiSelectionSearchComboBox2.SelectedItems?=?list.Skip(3).ToList();
????????}
????????private?void?Button_Click(object?sender,?System.Windows.RoutedEventArgs?e)
????????{
????????????WPFDevelopers.Controls.MessageBox.Show($"{MyMultiSelectionSearchComboBox2.Text}?\r\n總共選中:{MyMultiSelectionSearchComboBox2.SelectedItems.Count}?條","選中內(nèi)容",MessageBoxButton.OK,MessageBoxImage.Information);??????
????????}
????}
}效果圖
到此這篇關(guān)于WPF實(shí)現(xiàn)篩選下拉多選控件的示例代碼的文章就介紹到這了,更多相關(guān)WPF篩選下拉多選控件內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！
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