自定义Silverlight TextBox 具有下拉框提示控件_.NET_编程开发_程序员俱乐部

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

 1 <UserControl x:Class="PopListView.PopView"
 2     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 3     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 4     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
 5     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
 6     mc:Ignorable="d">
 7 
 8     <Grid x:Name="LayoutRoot" Background="White" >
 9         <Grid.RowDefinitions>
10             <RowDefinition Height="Auto" />
11             <RowDefinition Height="Auto"/>
12         </Grid.RowDefinitions>
13         <TextBox  x:Name="txtUserName"  LostFocus="txtUserName_LostFocus"  ></TextBox>
14         <Popup x:Name="popupAutoComplte" Grid.Row="1">
15             <Grid Background="Gray" >
16                 <ListBox x:Name="SelctName" SelectedItem="{Binding SelectStr,Mode=TwoWay}" 
17 
18 ItemsSource="{Binding LoginNameList,Mode=TwoWay}"></ListBox>
19             </Grid>
20         </Popup>
21     </Grid>
22 </UserControl>

2、后台代码

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Net;
  5 using System.Windows;
  6 using System.Windows.Controls;
  7 using System.Windows.Documents;
  8 using System.Windows.Input;
  9 using System.Windows.Media;
 10 using System.Windows.Media.Animation;
 11 using System.Windows.Shapes;
 12 
 13 namespace PopListView
 14 {
 15 
 16     public partial class PopView : UserControl
 17     {
 18         public PopView()
 19         {
 20             InitializeComponent();
 21             bool _isEnterPress = true;
 22             txtUserName.SelectionChanged += new RoutedEventHandler((s, e) =>
 23             {
 24                 popupAutoComplte.IsOpen = false;
 25                 if (LoginNameList != null && LoginNameList.Count() > 0)
 26                 {
 27                     SelctName.Items.Clear();
 28                     TextBox txtbox = s as TextBox;
 29                     if (txtbox.Text.Trim() != "")
 30                     {
 31                         if (_isEnterPress)
 32                             popupAutoComplte.IsOpen = true;
 33 
 34                         LoginNameList = from u in LoginNameList
 35                                         where u.Contains(txtbox.Text)
 36                                         select u;
 37 
 38                         foreach (var item in LoginNameList)
 39                         {
 40                             SelctName.Items.Add(item);
 41                         }
 42                         _isEnterPress = true;
 43                     }
 44                     else
 45                     {
 46 
 47                     }
 48                 }
 49             });
 50 
 51             SelctName.SelectionChanged += new SelectionChangedEventHandler((s, e) =>
 52             {
 53                 ListBox Box = (ListBox)s;
 54                 if (Box.SelectedItem != null)
 55                 {
 56                     txtUserName.Text = Box.SelectedItem.ToString();
 57                     if (CheckLoginName != null)
 58                     {
 59                         CheckLoginName(txtUserName.Text);
 60                     }
 61                     _isEnterPress = false;
 62                     popupAutoComplte.IsOpen = false;
 63                 }
 64             });
 65             this.Loaded += new RoutedEventHandler(PropertyControl_Loaded);
 66         }
 67 
 68         void PropertyControl_Loaded(object sender, RoutedEventArgs e)
 69         {
 70 
 71         }
 72 
 73         #region 自定义的变量
 74 
 75         public IEnumerable<string> LoginNameList
 76         {
 77             get { return (IEnumerable<string>)GetValue(LoginNameListProperty); }
 78             set { SetValue(LoginNameListProperty, value); }
 79         }
 80 
 81         // Using a DependencyProperty as the backing store for LoginNameList.  This enables animation, styling, binding, etc...
 82         public static readonly DependencyProperty LoginNameListProperty =
 83             DependencyProperty.Register("LoginNameList", typeof(IEnumerable<string>), typeof(PopView), new PropertyMetadata(OnChange));
 84 
 85         private static void OnChange(DependencyObject d, DependencyPropertyChangedEventArgs e)
 86         {
 87 
 88         }
 89         public String Text 
 90         {
 91             get { return txtUserName.Text; }
 92         }
 93 
 94 
 95 
 96         public double PopWidth
 97         {
 98             get { return (double)GetValue(PopWidthProperty); }
 99             set { SetValue(PopWidthProperty, value); }
100         }
101 
102         // Using a DependencyProperty as the backing store for PopWidth.  This enables animation, styling, binding, etc...
103         public static readonly DependencyProperty PopWidthProperty =
104             DependencyProperty.Register("PopWidth", typeof(double), typeof(PopView), new PropertyMetadata(new PropertyChangedCallback((n, s) => 
105             {
106                 ((PopView)n).txtUserName.Width = double.Parse(s.NewValue.ToString());
107                 ((PopView)n).SelctName.Width = double.Parse(s.NewValue.ToString());
108             })));
109 
110         public delegate void LoginName(string Name);
111         public event LoginName CheckLoginName;
112         #endregion
113 
114         private void txtUserName_LostFocus(object sender, RoutedEventArgs e)
115         {
116             popupAutoComplte.IsOpen = false;
117             
118         }
119 
120 
121     }
122 }

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；