窗口切换之间刷新图片

Question

I have simple wpf app which consist of 2 windows: MainMenu and PictureWindow. In MainMenu I have one button with click event which opens Picture Window:

private void btnOpenPicWindow_Click(object sender, RoutedEventArgs e)
{
    var picWindow = new PictureWindow();
    Application.Current.MainWindow = picWindow;
    Close();
    picWindow.Show();
}

In PictureWindow I have WindowsFormsHost with PictureBox . In PictureWindow I receive image which I send from another app and I show it on PictureBox . PictureWindow also has a button with click event which goes back to MainMenu like this:

private void btnBack_Click(object sender, RoutedEventArgs e)
{
    var mMenu = new MainWindow();
    System.Windows.Application.Current.MainWindow = mMenu;
    Close();
    mMenu.Show();
}

Everything is ok when I open MainWindow and then PictureWindow. The problem is when I go back from PictureWindow to MainMenu and then once again to PictureWindow and if I send picture to my PictureBox it does not refresh. I receive the image cause I see it during debbuging but my PictureBox is blank.

Answer 1

You should try to re-initialize your window with your picture every time you click on the button on your MainWindow.

You can change LoadAsync for Load if you'd like to load your image with an Asynchronous or Synchronous method.

WPF PictureWindow:

<Window x:Class="WpfApplication2.PictureWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="PictureWindow" Height="300" Width="300"
        xmlns:wf="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms" Loaded="Window_Loaded">
    <Grid>
        <WindowsFormsHost Height="100" HorizontalAlignment="Left" Margin="12,12,0,0" Name="windowsFormsHost1" VerticalAlignment="Top" Width="200">
            <wf:PictureBox x:Name="pbImage" SizeMode="AutoSize"></wf:PictureBox>
        </WindowsFormsHost>
    </Grid>
</Window>

C# PictureWindow:

public partial class PictureWindow : Window
{
    public string imgsrc = string.Empty;
    public PictureWindow()
    {
        InitializeComponent();
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        pbImage.LoadAsync(imgsrc);
    }
}

C# MainWindow:

public partial class MainWindow : Window
{
    PictureWindow window;

    public MainWindow()
    {
        InitializeComponent();
    }
}
private void button1_Click(object sender, RoutedEventArgs e)
{
    window = new PictureWindow();
    window.imgsrc = textBox1.Text.Trim(); //Here you update your "Source" for your image.
    window.Show();
}