Controls/MultiComboBox.cs

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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;

namespace WPFDemo.Controls
{
    public class MultiComboBox : ComboBox
    {
        static MultiComboBox()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(MultiComboBox), new FrameworkPropertyMetadata(typeof(MultiComboBox)));
        }


        private static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            d.SetValue(e.Property, e.NewValue);
        }

        /// <summary>
        /// 选中项列表
        /// </summary>
        public ObservableCollection<MultiCbxBaseData> ChekedItems=new ObservableCollection<MultiCbxBaseData>(); 

        /// <summary>
        /// ListBox竖向列表
        /// </summary>
        private ListBox _ListBoxV;

        /// <summary>
        /// ListBox横向列表
        /// </summary>
        private ListBox _ListBoxH;

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
            _ListBoxV = Template.FindName("PART_ListBox", this) as ListBox;
            _ListBoxH = Template.FindName("PART_ListBoxChk", this) as ListBox;
            _ListBoxH.ItemsSource = ChekedItems;
            _ListBoxV.SelectionChanged += _ListBoxV_SelectionChanged;
            _ListBoxH.SelectionChanged += _ListBoxH_SelectionChanged;

            if (ItemsSource != null)
            {
                foreach (var item in ItemsSource)
                {
                    MultiCbxBaseData bdc = item as MultiCbxBaseData;
                    if (bdc.IsCheck)
                    {
                        _ListBoxV.SelectedItems.Add(bdc);
                    }
                }
            }
        }