如何将文本框脱字符位置设置为文本结尾？

Question

我有框架和页框内的窗口。

页面有一个文本框，当有人开始写入该文本框时，我想将该框架导航到另一个页面（类似于谷歌搜索，当您开始编写时，搜索结果立即出现在不同视图中）。

我现在对这两个页面对象都使用相同的DataContext，因此它们都可以读取属性searledText的值，该属性我已绑定到每个页面上的TextBox。

页Search.xml：

<Page x:Class="Customer_UI.Search" 
     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" 
     mc:Ignorable="d" 
     d:DesignHeight="300" d:DesignWidth="300" 
     Title="Search"> 
    <Grid> 
     <Grid.RowDefinitions> 
      <RowDefinition Height="*"></RowDefinition> 
     </Grid.RowDefinitions> 
     <Grid.ColumnDefinitions> 
      <ColumnDefinition Width="*"></ColumnDefinition> 
     </Grid.ColumnDefinitions> 
     <TextBox Name="searchBox" Grid.Column="0" Grid.Row="0" Margin="30" FontSize="28" Padding="10" TextAlignment="Center" VerticalAlignment="Center" BorderThickness="5" KeyUp="TextBox_KeyUp" Text="{Binding Path=SearchedCustomer}" > 
     </TextBox> 
    </Grid> 
</Page> 

搜索后台代码：

namespace Customer_UI 
{ 
    public partial class Search : Page 
    { 
     private void TextBox_KeyUp(object sender, KeyEventArgs e) 
     { 
      SearchExpanded searchExpanded = new SearchExpanded(); 
      searchExpanded.DataContext = this.DataContext; 
      (this.DataContext as MainWindow.MainWindowContext).MainWindow.MainFrame.Navigate(searchExpanded); 
      searchExpanded.FocusSearchBox(); 
     } 
    } 
} 

页SearchExpanded.xml：

<Page x:Class="Customer_UI.SearchExpanded" 
     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" 
     mc:Ignorable="d" 
     d:DesignHeight="300" d:DesignWidth="300" 
     Title="SearchExpanded"> 
    <Grid> 
     <Grid.RowDefinitions> 
      <RowDefinition Height="auto"></RowDefinition> 
      <RowDefinition Height="*"></RowDefinition> 
     </Grid.RowDefinitions> 
     <Grid.ColumnDefinitions> 
      <ColumnDefinition Width="*"></ColumnDefinition> 
     </Grid.ColumnDefinitions> 
     <TextBox Name="searchBox" Grid.Column="0" Grid.Row="0" FontSize="18" Padding="10" TextAlignment="Center" VerticalAlignment="Center" BorderThickness="5" Text="{Binding Path=SearchedCustomer}" > 
     </TextBox> 
    </Grid> 
</Page> 

SearchExpanded后面的代码：

namespace Customer_UI 
{ 
    public partial class SearchExpanded : Page 
    { 
     public void FocusSearchBox() 
     { 
      MainWindow.MainWindowContext dc = DataContext as MainWindow.MainWindowContext; 
      // this has no output, the input from TextBox on Page that causes navigation to this page is probably still not reflected to dataContext.searchedCustomer property 
      Console.WriteLine(dc.SearchedCustomer); 

      // problem is that this time dc.SearchedCustomer has still lenght zero 

      searchBox.Focus(); 
     } 
    } 
} 

Answer 1

设置SelectionStart属性设置为文本的长度。