Windows Store App XAML-如何获取导航页面的文本框值

Question

Windows Store App XAML-如何获取导航页面的文本框值。我有2个页面1.MainPage.xaml 2.MainPage中的Infopage.xaml我有一个Button（获取InfoPage的TextBox值）和一个框架（导航InfoPage） ）..在InfoPage中有一些TextBoxes..now如何获取InfoPage TextBox值

Answer 1

In additional to Neal's solution, here is another two ways you can also reference.

One way is to define a static parameter on infoPage and set the value to current page. Then you can invoke the method on infoPage from MainPage . Code like follows:

infoPage

 public static InfoPage Current;
 public InfoPage()
 {
     this.InitializeComponent();
     Current = this;      
 }
public string gettext()
{
    return txttext.Text;
}

MainPage

private void btngetsecondpage_Click(object sender, RoutedEventArgs e)
{
    InfoPage infopage = InfoPage.Current;
    txtresult.Text = infopage.gettext();  
}

More details about ApplicationData please reference the official sample .

Another way is to save the text temporary in ApplicationData.LocalSettings on infoPage and read the text out on the MainPage . Code like follows:

infoPage

private void txttext_TextChanged(object sender, TextChangedEventArgs e)
{
    ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;
    localSettings.Values["texboxtext"] =txttext.Text; // example value            
}

MainPage

 private void btngetsecondpage_Click(object sender, RoutedEventArgs e)
 { 
     ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;
     if (localSettings.Values["texboxtext"] != null)
     {
         txtresult.Text = localSettings.Values["texboxtext"].ToString();
     }
 }

If you have a large amount of data, a better way is to create a local file as database, and use a MVVM pattern to write data into local file from infoPage and bind data which saved in the database to MainPage . More details about MVVM in uwp you can reference this article .

Answer 2

The easiest way is to store the value from the InfoPage to the global variable inside the App object and then retrieve it in the MainPage.

In the app.xaml.cs, define a string or List,

public string commonValue;

In the InfoPage

    <StackPanel Orientation="Vertical" VerticalAlignment="Center" Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <TextBox Name="tb1" Text="Hello"/>

In the InfoPage code behind, we store the value of textbox to the app.

        public InfoPage()
    {
        this.InitializeComponent();
        App app = Application.Current as App;
        app.commonValue = tb1.Text;
    }

Then in the MainPage:

    <StackPanel VerticalAlignment="Center" Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <Button Content="MainPage" Click="Button_Click"/>
    <TextBox Name="textbox1"/>

In the MainPage code behind, we need to initialize the InfoPage then retrieve the value:

    public sealed partial class MainPage : Page
{
    public MainPage()
    {
        this.InitializeComponent();
        InfoPage info = new InfoPage();
        info.InitializeComponent();
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        App app = Application.Current as App;
        textbox1.Text = app.commonValue;
    }
}