WPF从子窗口更新父控件状态

Question

I have got a status bar in Main Windows and I use User control as a child inside the main window. I just want to update TextBox in the status bar which is inside the Main windows.

 <Grid x:Name="grControls">             

 </Grid>    
 <StatusBar>
    <StatusBarItem Grid.Column="5">
        <TextBlock Name="NumberOfItemTextBox" >No:</TextBlock>
    </StatusBarItem>
 </StatusBar>

// CODE BEHIND I load Child windows into "grContorls"
        grControls.Children.Clear();
        var userCont = new PAMHeaderUC
        {
            ParentControl = this
        };
        grControls.Children.Add(userCont);

I just want to update NumberOfItemTextBox in child Usercontrol.

Answer 1

These is code behind solution. If you are using MVVM it will be much cleaner. From your usercontrol code behind, you can get your window, then you cast your window into your main window class that derives from Window and you got access to textBox

Window parentWindow = Window.GetWindow(userControlRefernce);
var yourInstanceOfWindow = (CastToYourNameOfClass)parentWindow;
yourInstanceOfWindow.NumberOfItemTextBox.Text = "someString";