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Fran Pino
Asked: 2020-08-19 02:37:20 +0800 CST 2020-08-19 02:37:20 +0800 CST

You can update the origin of a WPF Biding

  • 772

to see if they could help me. I have two TextBox each in a different class, and I need what is typed in one to be displayed in the other.

The one that should receive the data I have it like this in xaml:

<TextBox x:Name="mTxtPuntosLocal" Text="{Binding AddPuntoLocal, ElementName=ventana}" HorizontalAlignment="Left"  TextWrapping="Wrap"  VerticalAlignment="Top" FontSize="100"  Background="{x:Null}" BorderBrush="{x:Null}"  Width="135"/>

Right now I take the data to prove that it receives like this:

string varPuntoLocal;       
        public string AddPuntoLocal
        {
            get
            {
                return  "3";
            }
            set
            {
                varPuntoLocal = value;
            }
        }

Right now I always get the "3". I need it to show me what is inside another textbox of another class, how I should reference it inside the Biding.

Thank you

c#

1 Answers

  1. Best Answer

    I have found on StackOverflow in English the answer to your question. I hope it helps you here I leave the link and I copy the information.

    What you have to do is pass a reference to the first window or object that will update the text property to the second window, which it's DataContext property will do for you, then you can bind the second windows controls to the same.

    MainWindow.xaml.cs

    public partial class MainWindow : Window
{
    public string TestString
    {
        get { return (string)GetValue(TestStringProperty); }
        set { SetValue(TestStringProperty, value); }
    }

    public static readonly DependencyProperty TestStringProperty =  DependencyProperty.Register("TestString", typeof(string), typeof(MainWindow), new UIPropertyMetadata(null));

    public MainWindow()
    {
        InitializeComponent();

        // setup the test string.
        TestString = "this is a test.";

        // Create the second window and pass this window as it's data context.
        Window1 newWindow = new Window1()
        {
            DataContext = this
        };
        newWindow.Show();
    }
}

    MainWindow.xaml - Take note of the DataContext line in the window declaration.

    <Window x:Class="WpfApplication5.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525"
        DataContext="{Binding RelativeSource={RelativeSource Self}}"
        >
    <Grid>
        <TextBox Text="{Binding TestString, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Margin="91,84,185,189" />
    </Grid>
</Window>

    Window1.xaml

    <Window x:Class="WpfApplication5.Window1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Window1" Height="300" Width="300">
    <Grid>
        <TextBlock Text="{Binding TestString, UpdateSourceTrigger=PropertyChanged}"/>
</Grid>

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