I have two Textboxes, I tried to update the second Textbox when i changed the first one but it's only work when i clicked another control or we can say a Button and also if i change the Second Textbox and click the button the First Textbox not gonna be updated.
I'm using WPF .Net 6.0
ShellView
<Window x:Class="WpfApp3.Views.ShellView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApp3.Views"
mc:Ignorable="d"
Title="ShellView" Height="450" Width="450">
<Grid>
<StackPanel>
<TextBox Text="{Binding Path=Name , Mode=OneWay}"/>
<TextBox x:Name="Name" />
<Button Content="Click Me" />
</StackPanel>
</Grid>
ShellViewModel
public class ShellViewModel : PropertyChangedBase
{
string name = "";
public string Name
{
get { return name; }
set
{
name = value;
NotifyOfPropertyChange(() => Name);
}
}
}
CodePudding user response:
To synchronize both TextBox
elements you must bind them to a common property using BindingMode.TwoWay
(if both elements can update each other).
To update the Binding
set on the TextBox.Text
property without moving the focus, you must configure the Binding
accordingly by setting Binding.UpdateSourceTrigger
to UpdateSourceTrigger.PropertyChanged
. The default value is UpdateSourceTrigger.PropertyChanged
. But TextBox
internally changes this default to UpdateSourceTrigger.LostFocus
to improve the performance and input handling for common scenarios. TextBox
also sets the Binding.Mode
of the TextBox.Text
property to BindingMode.TwoWay
which otherwise would default to BindingMode.OneWay
.
<TextBox Text="{Binding Name, UpdateSourceTrigger=PropertyChanged}" />
<TextBox x:Name="Name"
Text="{Binding Name, UpdateSourceTrigger=PropertyChanged}" />
If you e.g. trigger the operation that processes the text field's input with a button, I recommend to leave the UpdateSourceTrigger
at the default.