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文档摘要

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第

WPF实现筛选下拉多选控件的示例代码

VisualStudio2025;

接着上一篇，MultiSelectionSearchComboBox无法做到根据值选中选项，使用Selecteditems时会默认选中集合中的最后一个切选项选择功能会失效，这明显是不对的issue.

因为先前的OnSelectedItemsChanged逻辑处理错误，导致Binding多个选择值只保留了最后一次，因为之前为对listBox.SelectionChanged取消订阅。

实现代码

1）修改MultiSelectionSearchComboBox.cs代码如下:

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(Se