自定义Silverlight TextBox 具有下拉框提示控件

1、前台页面的代码，TextBox下面放置了一个Popup控件。当TextBox获得焦点时，下面的Popup控件就会显示出来，并且根据TextBox的内容进行了模糊查询

<UserControl x:Class="PopListView.PopView"
    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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Grid x:Name="LayoutRoot" Background="White" >
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <TextBox  x:Name="txtUserName"  LostFocus="txtUserName_LostFocus"  ></TextBox>
        <Popup x:Name="popupAutoComplte" Grid.Row="1">
            <Grid Background="Gray" >
                <ListBox x:Name="SelctName" SelectedItem="{Binding SelectStr,Mode=TwoWay}" 

ItemsSource="{Binding LoginNameList,Mode=TwoWay}"></ListBox>
            </Grid>
        </Popup>
    </Grid>
</UserControl>

2、后台代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace PopListView
{

    public partial class PopView : UserControl
    {
        public PopView()
        {
            InitializeComponent();
            bool _isEnterPress = true;
            txtUserName.SelectionChanged += new RoutedEventHandler((s, e) =>
            {
                popupAutoComplte.IsOpen = false;
                if (LoginNameList != null && LoginNameList.Count() > 0)
                {
                    SelctName.Items.Clear();
                    TextBox txtbox = s as TextBox;
                    if (txtbox.Text.Trim() != "")
                    {
                        if (_isEnterPress)
                            popupAutoComplte.IsOpen = true;

                        LoginNameList = from u in LoginNameList
                                        where u.Contains(txtbox.Text)
                                        select u;

                        foreach (var item in LoginNameList)
                        {
                            SelctName.Items.Add(item);
                        }
                        _isEnterPress = true;
                    }
                    else
                    {

                    }
                }
            });

            SelctName.SelectionChanged += new SelectionChangedEventHandler((s, e) =>
            {
                ListBox Box = (ListBox)s;
                if (Box.SelectedItem != null)
                {
                    txtUserName.Text = Box.SelectedItem.ToString();
                    if (CheckLoginName != null)
                    {
                        CheckLoginName(txtUserName.Text);
                    }
                    _isEnterPress = false;
                    popupAutoComplte.IsOpen = false;
                }
            });
            this.Loaded += new RoutedEventHandler(PropertyControl_Loaded);
        }

        void PropertyControl_Loaded(object sender, RoutedEventArgs e)
        {

        }

        #region 自定义的变量

        public IEnumerable<string> LoginNameList
        {
            get { return (IEnumerable<string>)GetValue(LoginNameListProperty); }
            set { SetValue(LoginNameListProperty, value); }
        }

        // Using a DependencyProperty as the backing store for LoginNameList.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty LoginNameListProperty =
            DependencyProperty.Register("LoginNameList", typeof(IEnumerable<string>), typeof(PopView), new PropertyMetadata(OnChange));

        private static void OnChange(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {

        }
        public String Text 
        {
            get { return txtUserName.Text; }
        }



        public double PopWidth
        {
            get { return (double)GetValue(PopWidthProperty); }
            set { SetValue(PopWidthProperty, value); }
        }

        // Using a DependencyProperty as the backing store for PopWidth.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty PopWidthProperty =
            DependencyProperty.Register("PopWidth", typeof(double), typeof(PopView), new PropertyMetadata(new PropertyChangedCallback((n, s) => 
            {
                ((PopView)n).txtUserName.Width = double.Parse(s.NewValue.ToString());
                ((PopView)n).SelctName.Width = double.Parse(s.NewValue.ToString());
            })));

        public delegate void LoginName(string Name);
        public event LoginName CheckLoginName;
        #endregion

        private void txtUserName_LostFocus(object sender, RoutedEventArgs e)
        {
            popupAutoComplte.IsOpen = false;
            
        }


    }
}

这个本来在项目中我是使用在登陆的时候用到了。而且用到了独立储存空间来保存用户的登陆信息；