WPF Image: .Source = Clipboard.GetImage() is not displayed

Question

This simple program does not work, the image does not appear in the Window.

namespace ClipBoardTest
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        private void CopyButton_Click(object sender, RoutedEventArgs e)
        {
            if (Clipboard.ContainsImage())
            {
                ImageUIElement.Source = Clipboard.GetImage();
                Console.WriteLine("Clipboard copied to UIElement");
            }
            else
            {
                Console.WriteLine("No image in Clipboard");
            }
        }
    }
 }

Output is "Clipboard copied to UIElement", but the image does not appear in the Window.

XAML:

 <Window x:Class="ClipBoardTest.MainWindow"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         Title="MainWindow" Height="350" Width="525">
     <Grid>
         <Button x:Name="CopyButton" Content="Copy" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="75" Click="CopyButton_Click"/>
         <Image x:Name="ImageUIElement" Margin="90,10,10,10"/>
     </Grid>
 </Window>

Is there anybody, who understands, what is wrong?

Answer 1

Use Clipboard.GetDataObject to get bitmap and convert it into bitmapSource. Also, be aware that Bitmap.GetHbitmap() leaks memory unless you call DeleteObject on it.

So, correct solution would be to dispose the IntPtr after use. Declare the method at class level and use it from your code:

// at class level
[System.Runtime.InteropServices.DllImport("gdi32.dll")]
public static extern bool DeleteObject(IntPtr hObject);

---

if (Clipboard.ContainsImage())
{
    IDataObject clipboardData = Clipboard.GetDataObject();
    if (clipboardData != null)
    {
        if (clipboardData.GetDataPresent(System.Windows.Forms.DataFormats.Bitmap))
        {
            System.Drawing.Bitmap bitmap = (System.Drawing.Bitmap)clipboardData.GetData(System.Windows.Forms.DataFormats.Bitmap);
            IntPtr hBitmap = bitmap.GetHbitmap();
            try
            {
                ImageUIElement.Source = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
                Console.WriteLine("Clipboard copied to UIElement");
            }
            finally 
            {
                DeleteObject(hBitmap)
            }
        }
    }
}

Source - MSDN and Memory leak in Bitmap.

Answer 2

Visual Studio 2019, WPF C# project targeting .NET Core 3.1, the following works (or, at least, it does for me):

myImage.Source = GetImageFromClipBoard();

where:

public static ImageSource GetImageFromClipBoard ()
        {
        if (Clipboard.ContainsImage())
            {
            return Clipboard.GetImage();
            }
        else
            return null;
        }