Update text in WPF textbox user control using Winform

Question

I'm using both WinForm and WPF. I'm trying to figure out how to update the text in my WPF textbox control in my WinForm application on button click. Using WinForm Textbox I can simply do MyTextBox.Text = counter, but with WPF I'm not able to. Why, and how do you do this?

For example, if i click on the button my WPF textbox should count up 1,2,3,4,5...but it doesn't.

WinForm Code

    int counter = 0;

    private void counter_btn_Click(object sender, EventArgs e)
    {
        counter++;
        CountTxtBx.Text = counter.ToString();
        CountTxtBx.Update();
        Console.WriteLine(counter);

    }

WPF User TextBox User Control

<UserControl x:Class="textbox_Update.UserControl1"
         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" 
         xmlns:local="clr-namespace:textbox_Update"
         mc:Ignorable="d" 
         d:DesignHeight="50
         " d:DesignWidth="239">
<Grid>
    <TextBox x:Name="textBox" HorizontalAlignment="Left" Height="50" TextWrapping="Wrap" Text="{Binding ElementName=textBox1, Path=Text}" VerticalAlignment="Top" Width="239" FontSize="20" Padding="0,7,0,0"/>

</Grid>

My WPF User Control Settings in WinForms

You have a strange Binding on the textbox named textBox. Text="{Binding ElementName=textBox1, Path=Text}"? — user1562155
– user1562155, Commented Oct 21, 2016 at 18:46
I just removed that. to its default which was Text="TextBox", but it still doesn't work. I put Text="{Binding ElementName=textBox1, Path=Text}" because i thought i was missing that. I was trying to troubleshoot it. — taji01
– taji01, Commented Oct 21, 2016 at 18:50

score 2 · Accepted Answer · 2016-10-21 19:30:39Z

2

Bind your textbox in the user control like this:

<TextBox x:Name="textBox" HorizontalAlignment="Left" Height="50" TextWrapping="Wrap" Text="{Binding RelativeSource={RelativeSource AncestorType=UserControl}, Path=CounterValue}" VerticalAlignment="Top" Width="239" FontSize="20" Padding="0,7,0,0"/>

In code behind of the usercontrol you add a dependency property:

    public int CounterValue
    {
      get { return (int)GetValue(CounterValueProperty); }
      set { SetValue(CounterValueProperty, value); }
    }

    // Using a DependencyProperty as the backing store for CounterValue.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty CounterValueProperty =
        DependencyProperty.Register("CounterValue", typeof(int), typeof(UserControl1), new PropertyMetadata(0));

  }

In your WinForm Button.Click event you can update like this:

private void button1_Click(object sender, EventArgs e)
{
  (CountTxBx.Child as UserControl1).CounterValue++;
}

edited Oct 21, 2016 at 19:30

answered Oct 21, 2016 at 19:22

user1562155

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1 Comment

taji01 Over a year ago

Thank you i really appreciate it! :)

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