用文本框搜索第一個字母

Question

我正在爲WP8製作一個包含地址列表框的應用程序。地址可以用文本框搜索。 我的問題是，文本框搜索隨機字母后，而不是在開頭的字母。這裏是我的代碼：

VB.net

Private Sub txtSearch_TextChanged(sender As Object, e As TextChangedEventArgs) 
     If lstRestaurants IsNot Nothing Then 
      Me.listBox.ItemsSource = lstRestaurants.Where(Function(w) w.Restaurantnaam.ToUpper().Contains(txtSearch.Text.ToUpper())) 
     End If 
    End Sub 

XAML

<phone:PhoneApplicationPage 
    x:Class="PhoneApp1.LijstRestaurants" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" 
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    FontFamily="{StaticResource PhoneFontFamilyNormal}" 
    FontSize="{StaticResource PhoneFontSizeNormal}" 
    Foreground="{StaticResource PhoneForegroundBrush}" 
    SupportedOrientations="Portrait" Orientation="Portrait" 
    mc:Ignorable="d" 
    shell:SystemTray.IsVisible="True"> 

    <Grid x:Name="LayoutRoot" Background="Transparent"> 
     <Grid.RowDefinitions> 
      <RowDefinition Height="Auto"/> 
      <RowDefinition Height="*"/> 
     </Grid.RowDefinitions> 

     <!--TitlePanel contains the name of the application and page title--> 
     <StackPanel Grid.Row="0" Margin="12,17,0,28"/> 

     <!--ContentPanel - place additional content here--> 
     <TextBox x:Name="txtSearch" TextChanged="txtSearch_TextChanged" Text="" Margin="0,-500,0,0" Height="80" ></TextBox> 
     <ListBox x:Name="listBox" FontSize="26" Height="580" Margin="0,100,0,0"> 
      <ListBox.ItemTemplate> 
       <DataTemplate> 
        <StackPanel Orientation="Horizontal"> 
         <TextBlock Text="{Binding Restaurantnaam}" Width="440" Margin="10,15,0,0" Height="80"/> 
        </StackPanel> 
       </DataTemplate> 
      </ListBox.ItemTemplate> 
     </ListBox> 
    </Grid> 

</phone:PhoneApplicationPage> 

有人可以幫我嗎？ 謝謝。

Answer 1

嘗試使用的StartsWith()代替Contains()由開始字母（或多個）搜索：

Me.listBox.ItemsSource = lstRestaurants.Where(Function(w) w.Restaurantnaam.ToUpper().StartsWith(txtSearch.Text.ToUpper()))