自定义ComboBox控件，完美解决C#自带的ComboBox效率慢的问题

<UserControl x:Class=" MyComboBox"

             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

             Loaded="UserControl_Loaded"

             >

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    <Grid>

        <DockPanel>

            <Border DockPanel.Dock="Top" BorderBrush="Black" BorderThickness="1">

               <StackPanel Orientation="Horizontal">

                    <TextBox Margin="0,0,1,0" Name="textBox_ComboBox" KeyUp="textBox_ComboBox_KeyUp" />

                    <Button Width="13" Name="button_drop" HorizontalAlignment="Right" FontSize="7" Click="button_drop_Click">▼</Button>

               </StackPanel>

            </Border>

            <ListBox DockPanel.Dock="Top" Margin="0,1,0,0" Name="listBox_ComboBox" Visibility="Collapsed" MouseDoubleClick="listBox_ComboBox_MouseDoubleClick" />         

        </DockPanel>

    </Grid>

</UserControl>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

namespace MyComboBox_real

{

    ///<summary>

    /// Interaction logic for MyComboBox.xaml

    ///重写的一具有部分combobox功能¨1能¨1的ì?mycombobox,效?ì率¨o比ਨ原-combobox高?很¨1多¨¤倍à?！ê?

    ///可¨|扩¤?充?

    ///</summary>

    public partial class MyComboBox : UserControl

    {

        #region 内¨2部?类¤¨¤

        ///<summary>

        /// Items存??储??é类¤¨¤

        ///</summary>

        public class MyItems

        {

            #region 重?要°a变à?量￠?

            ///<summary>

            ///存??储??é传??递ìY进?来¤??的ì?string类¤¨¤型¨a的ì?数oy据Y

            ///</summary>

            private List<string> listItemMSG = new List<string>();

            ///<summary>

            ///存??储??é传??递ìY进?来¤??的ì?string类¤¨¤型¨a的ì?数oy据Y

            ///</summary>

            public List<string> ListItemMSG

            {

                get { return this.listItemMSG; }

                set { this.listItemMSG = value; }

            }

            #endregion

            #region 构1造¨?函?￥数oy

            ///<summary>

            ///无T参?构1造¨?函?￥数oy

            ///</summary>

            public MyItems()

            {

            }

            #endregion

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            #region 业°|ì务?处?|理¤¨a函?￥数oy

            ///<summary>

            ///返¤|ì回?与??输o?入¨?字á?符¤?串??相¨¤似?的ì?所¨′有?D字á?符¤?串??

            ///</summary>

            ///<param name="msg"></param>

            ///<returns></returns>

            public List<string> getMatchDatas(string msg)

            {

                return this.ListItemMSG.Where

                    (

                    f => ((f.Length >= msg.Length) && (((f.Substring(0, msg.Length)).ToLower()) == (msg.ToLower())))

                    ).ToList<string>();

            }

            ///<summary>

            ///添?¨a加¨?string类¤¨¤型¨a的ì?数oy据Y

            ///</summary>

            ///<param name="msg">数oy据Y</param>

            ///<returns>成¨|功|返¤|ì回?1</returns>

            public int add(string msg)

            {

                this.ListItemMSG.Add(msg);

                return 1;

            }

            ///<summary>

            ///清?除yitems

            ///</summary>

            ///<returns></returns>

            public int clear()

            {

                this.ListItemMSG.Clear();

                return 1;

            }

            #endregion

        }

        #endregion

        #region 重?要°a变à?量￠?

        ///<summary>

        ///项?目?处?|理¤¨a

        ///</summary>

        public MyItems myItems = new MyItems();

        #endregion

        #region 构1造¨?函?￥数oy

        ///<summary>

        ///无T参?构1造¨?函?￥数oy

        ///</summary>

        public MyComboBox()

        {

            InitializeComponent();

            //this.listBox_ComboBox.ItemsSource = this.myItems.getMyItems();

        }

        #endregion

        #region 业°|ì务?处?|理¤¨a函?￥数oy

        ///<summary>

        ///监¨¤控?键¨1盘¨?操¨′作á??

        ///</summary>

        ///<param name="sender"></param>

        ///<param name="e"></param>

        private void textBox_ComboBox_KeyUp(object sender,KeyEventArgs e)

        {

            TextBox tb = senderas TextBox;

            if (tb == null)

            {

                return;

            }

            //  键¨1盘¨?“??↑¨1”?à、?é“??←?”?à键¨1

            if ((e.Key == Key.Up) || (e.Key == Key.Left))

            {

                if (this.listBox_ComboBox.SelectedIndex > 0)

                {

                    this.listBox_ComboBox.SelectedIndex--;

                }

            }

            //  键¨1盘¨?“??↓y”?à、?é“??→¨2”?à键¨1

            else if ((e.Key == Key.Down) || (e.Key == Key.Right))

            {

                if (this.listBox_ComboBox.SelectedIndex < (this.listBox_ComboBox.Items.Count - 1))

                {

                    this.listBox_ComboBox.SelectedIndex++;

                }

            }

            // 回?车|ì键¨1

            else if (e.Key == Key.Enter)

            {

                tb.Text = this.listBox_ComboBox.SelectedItem ==null ? tb.Text : this.listBox_ComboBox.SelectedItem.ToString();

                this.listBox_ComboBox.Visibility =Visibility.Collapsed;

            }

            else

            {

                if ((tb.Text != null) && (tb.Text != ""))

                {

                    if (this.myItems.getMatchDatas(tb.Text).Count > 0)

                    {

                        this.listBox_ComboBox.ItemsSource =this.myItems.getMatchDatas(tb.Text);

                        this.listBox_ComboBox.Visibility =Visibility.Visible;

                    }

                    else

                    {

                        this.listBox_ComboBox.Visibility =Visibility.Collapsed;

                    }

                }

                else

                {

                    this.listBox_ComboBox.Visibility =Visibility.Collapsed;

                }

            }

            // 重?置?光a标à¨o位?置?

            tb.Select(tb.Text.Length, 1);

        }

        ///<summary>

        ///选?择?内¨2容¨Y

        ///</summary>

        ///<param name="sender"></param>

        ///<param name="e"></param>

        private void listBox_ComboBox_MouseDoubleClick(object sender,MouseButtonEventArgs e)

        {

            ListBox lb = senderas ListBox;

            if (lb == null)

            {

                return;

            }

            if (lb.SelectedItem ==null)

            {

                lb.Visibility = Visibility.Collapsed;

                return;

            }

            this.textBox_ComboBox.Text = lb.SelectedItem.ToString();

            lb.Visibility = Visibility.Collapsed;

            // 重?置?光a标à¨o位?置?

            this.textBox_ComboBox.Select(this.textBox_ComboBox.Text.Length, 1);

        }

        #endregion

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        #region 私?有?D函?￥数oy

        ///<summary>

        ///重?置?控?件t宽¨a度¨¨

        ///</summary>

        ///<param name="sender"></param>

        ///<param name="e"></param>

        private void UserControl_Loaded(object sender, RoutedEventArgs e)

        {

            this.textBox_ComboBox.Width =this.ActualWidth - 1 - this.button_drop.ActualWidth;

        }

        ///<summary>

        ///模?ê拟a点ì?击??下?拉¤-

        ///</summary>

        ///<param name="sender"></param>

        ///<param name="e"></param>

        private void button_drop_Click(object sender, RoutedEventArgs e)

        {

            if (this.listBox_ComboBox.Visibility ==Visibility.Visible)

            {

                this.listBox_ComboBox.Visibility =Visibility.Collapsed;

            }

            else

            {

                this.listBox_ComboBox.ItemsSource =this.myItems.ListItemMSG;

                this.listBox_ComboBox.Visibility =Visibility.Visible;

            }

        }

        #endregion

    }

}