在WPF中的2个用户控件之间共享数据

Question

I have usercontrol lets say UA with a textbox in it. Now i want to access the value in the textbox in the codebehind of another usercontrol, let says UB Both the usercontrols are on a tab. What is the efficient way to do this?

Answer 1

Provide both UserControls with a dependency property that the other can bind to or

Some xaml:

<local:Uc1 x:Name="uc1" DataContext="{Binding ElementName=uc2, Path=Thing}" />
<local:Uc2 x:Name="uc2" />

This can be done in code as well.

or bind both UserControls to the same ViewModel.

also look this and this

Updated Answer

Defining custom Dependency Property in MainWindow.cs

public string Prop
    {
        get { return (string)GetValue(PropProperty); }
        set { SetValue(PropProperty, value); }
    }

    // Using a DependencyProperty as the backing store for Prop.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty PropProperty =
        DependencyProperty.Register("Prop", typeof(string), typeof(MainWindow), new PropertyMetadata("Hello!!"));

Now just bind this dp to your two user control UserControl 1

 <Grid>
    <TextBox Height="25" Text="{Binding RelativeSource={RelativeSource AncestorType=Window},Path=Prop, 
        Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Width="65"/>
</Grid>

UserControl 2

 <Grid>
    <TextBox Height="25" Text="{Binding RelativeSource={RelativeSource AncestorType=Window},Path=Prop, 
        Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Width="65"/>
</Grid>

This is just an example to get going with custom dp`s.