WPF: How to Prevent Memory Leaks When Using CreateBitmapSourceFromHBitmap()?

WPF: Memory leak in CreateBitmapSourceFromHBitmap()

In WPF applications, repeated use of CreateBitmapSourceFromHBitmap() can cause memory leaks. This problem occurs because the underlying GDI bitmap used by CreateBitmapSourceFromHBitmap() is not released correctly.

To resolve this memory leak, the GDI bitmap must be released manually using the gdi32.dll method in the DeleteObject() library. You can achieve this by wrapping the Bitmap object in a using() statement, which automatically calls the Dispose() method to release the GDI bitmap. Here is the updated code:

using System.Runtime.InteropServices;

...

using (System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(1000, 1000))
{
    IntPtr hBitmap = bmp.GetHbitmap();

    try
    {
        var source = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());
    }
    finally
    {
        DeleteObject(hBitmap);
    }
}

You can free a GDI bitmap and prevent memory leaks by using the using statement and calling DeleteObject() explicitly. This ensures that memory is released correctly even if called repeatedly.

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