【发布时间】：2016-05-30 13:19:04
【问题描述】：
在我的页面右侧有一些文本框（第 1 页），在左侧有一些按钮，如文本框上的 1、2、3（第 2 页）让焦点第 2 页出现在框架中。 现在我的问题是如何在按钮单击时在第 1 页的文本框中设置值，在 uwp 的第 2 页。
【问题讨论】：
标签： xaml c#-4.0 win-universal-app uwp uwp-xaml
【发布时间】：2016-05-30 13:19:04
【问题描述】：
您可以使用FrameworkElement.FindName method 从页面 2 中获取页面 1 中的 TextBox。
例如这里：
MainPage 有两个Frame:
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="2*" />
</Grid.ColumnDefinitions>
<Frame x:Name="frame1"></Frame>
<Frame x:Name="frame2" Grid.Column="1"></Frame>
</Grid>
后面的代码：
public MainPage()
{
this.InitializeComponent();
this.frame1.Navigate(typeof(MenuPage));
this.frame2.Navigate(typeof(Page1));
}
MenuPage 在我的测试中是一个空白页。
第 1 页：
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Tapped="Grid_Tapped">
<TextBlock Name="textBlock" Text="This is Page 1" VerticalAlignment="Top" FontSize="25" />
<Button VerticalAlignment="Top" Width="1"></Button>
<StackPanel VerticalAlignment="Center">
<TextBox Name="tb1" GotFocus="tb_GotFocus" />
<TextBox Name="tb2" Margin="0,30" GotFocus="tb_GotFocus" />
<TextBox Name="tb3" GotFocus="tb_GotFocus" />
</StackPanel>
</Grid>
后面的代码：
public Page1()
{
this.InitializeComponent();
this.Loaded += Page1_Loaded;
}
private Frame frame;
private void Page1_Loaded(object sender, RoutedEventArgs e)
{
Frame rootFrame = Window.Current.Content as Frame;
Page mainPage = rootFrame.Content as MainPage;
frame = mainPage.FindName("frame1") as Frame;
}
private void tb_GotFocus(object sender, RoutedEventArgs e)
{
frame.Navigate(typeof(Page2));
}
private void Grid_Tapped(object sender, TappedRoutedEventArgs e)
{
if (frame.CanGoBack)
frame.GoBack();
}
第 2 页：
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<TextBlock Text="This is Page 2" VerticalAlignment="Top" FontSize="25" />
<StackPanel VerticalAlignment="Center">
<Button Content="Button 1" Click="Button_Click_1" />
<Button Content="Button 2" Click="Button_Click_2" Margin="0,30" />
<Button Content="Button 3" Click="Button_Click_3" />
</StackPanel>
</Grid>
后面的代码：
public Page2()
{
this.InitializeComponent();
this.Loaded += Page2_Loaded;
}
private TextBox tb1;
private TextBox tb2;
private TextBox tb3;
private void Page2_Loaded(object sender, RoutedEventArgs e)
{
Frame rootFrame = Window.Current.Content as Frame;
Page mainPage = rootFrame.Content as MainPage;
Frame frame = mainPage.FindName("frame2") as Frame;
Page page1 = frame.Content as Page1;
tb1 = page1.FindName("tb1") as TextBox;
tb2 = page1.FindName("tb2") as TextBox;
tb3 = page1.FindName("tb3") as TextBox;
}
private void Button_Click_1(object sender, RoutedEventArgs e)
{
tb1.Text = "Button 1 Clicked!";
}
private void Button_Click_2(object sender, RoutedEventArgs e)
{
tb2.Text = "Button 2 Clicked!";
}
private void Button_Click_3(object sender, RoutedEventArgs e)
{
tb3.Text = "Button 3 Clicked!";
}
更新： MainPage 调用 Page 1：
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Button Content="Navigate to Page 1" Click="Button_Click" />
</Grid>
后面的代码：
private void Button_Click(object sender, RoutedEventArgs e)
{
this.Frame.Navigate(typeof(Page1));
}
第1页有一个Frame并调用第2页：
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="2*" />
</Grid.ColumnDefinitions>
<Frame Name="myframe"></Frame>
<Grid Grid.Column="1">
<TextBlock Name="textBlock" Text="This is Page 1" VerticalAlignment="Top" FontSize="25" />
<Button VerticalAlignment="Top" Width="1"></Button>
<StackPanel VerticalAlignment="Center">
<TextBox Name="tb1" GotFocus="tb_GotFocus" />
<TextBox Name="tb2" Margin="0,30" GotFocus="tb_GotFocus" />
<TextBox Name="tb3" GotFocus="tb_GotFocus" />
</StackPanel>
</Grid>
</Grid>
后面的代码：
private void tb_GotFocus(object sender, RoutedEventArgs e)
{
myframe.Navigate(typeof(Page2));
}
第 2 页：
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<TextBlock Text="This is Page 2" VerticalAlignment="Top" FontSize="25" />
<StackPanel VerticalAlignment="Center">
<Button Content="Button 1" Click="Button_Click_1" />
<Button Content="Button 2" Click="Button_Click_2" Margin="0,30" />
<Button Content="Button 3" Click="Button_Click_3" />
</StackPanel>
</Grid>
后面的代码有点不同：
public Page2()
{
this.InitializeComponent();
this.Loaded += Page2_Loaded;
}
private TextBox tb1;
private TextBox tb2;
private TextBox tb3;
private void Page2_Loaded(object sender, RoutedEventArgs e)
{
Frame rootFrame = Window.Current.Content as Frame;
Page page1 = rootFrame.Content as Page1;
tb1 = page1.FindName("tb1") as TextBox;
tb2 = page1.FindName("tb2") as TextBox;
tb3 = page1.FindName("tb3") as TextBox;
}
private void Button_Click_1(object sender, RoutedEventArgs e)
{
tb1.Text = "Button 1 Clicked!";
}
private void Button_Click_2(object sender, RoutedEventArgs e)
{
tb2.Text = "Button 2 Clicked!";
}
private void Button_Click_3(object sender, RoutedEventArgs e)
{
tb3.Text = "Button 3 Clicked!";
}
【讨论】：
-
我在主页中只有一个框架，它调用了 page1（文本框）。在 page1 我有另一个框架调用 page2 有按钮 1，按钮 2 .plz 告诉我如何用第 2 页代码编写 page1 代码。
-
@TrishitBera，好的，请参阅我答案的更新部分。简单多了，不过关键还是用
FindName来获取控制权，只是这里rootFrame的Content不一样。 -
Page page1 = rootFrame.Content as Page1;在错误出现“对象引用未设置为对象的实例”之后，page1 显示 null。请告诉是否缺少某些东西。
-
@TrishitBera，你测试了我的样品还是把我的样品换成了你的？是
rootFrame的Content的问题，可以看到我从MainPage导航到Page1，这两个页面的frame这里都是rootFrame，但是如果你在MainPage中设置了frame控件并导航进去这个框架到第1页，你应该首先找到MainPage，然后找到这个框架，然后找到Page1。 -
它解决了我的大问题..非常感谢...向您致敬先生.. :)
这是我找到的解决方案。它是上述部分的组合。 ShellPage 是一个框架页面。它有一个文本块，此代码位于 app.xaml.cs 页面中。
ShellPage currentPage = Window.Current.Content as ShellPage;
TextBlock tb1 = currentPage.FindName("InternetConnection") as TextBlock;
tb1.Text = InternetConnectionText;
tb1.Foreground = InternetConnectionForeground;
【讨论】：