public void TestCopyWritableBitmap() { var src256 = new MemoryBitmap <Byte>(256, 256, Pixel.Luminance8.Format) .AsSpanBitmap() .WithWPF(); var src512 = new MemoryBitmap <Byte>(512, 512, Pixel.Luminance8.Format) .AsSpanBitmap() .WithWPF(); WriteableBitmap dst = null; bool allPixelsEqualTo(WriteableBitmap bmp, Byte pix) { return(bmp.ToMemoryBitmap() .OfType <Byte>() .EnumeratePixels() .All(item => item.Pixel == pix)); } src256.Source.SetPixels <Byte>(100); src256.CopyTo(ref dst); Assert.NotNull(dst); Assert.AreEqual(typeof(WriteableBitmap), dst.GetType()); Assert.AreEqual(256, dst.PixelWidth); Assert.AreEqual(256, dst.PixelHeight); Assert.IsTrue(allPixelsEqualTo(dst, 100)); src256.Source.SetPixels <Byte>(105); src256.CopyTo(ref dst); Assert.IsTrue(allPixelsEqualTo(dst, 105)); src512.Source.SetPixels <Byte>(130); src512.CopyTo(ref dst); Assert.NotNull(dst); Assert.AreEqual(typeof(WriteableBitmap), dst.GetType()); Assert.AreEqual(512, dst.PixelWidth); Assert.AreEqual(512, dst.PixelHeight); Assert.IsTrue(allPixelsEqualTo(dst, 130)); src512.Source.SetPixels <Byte>(135); src512.CopyTo(ref dst); Assert.IsTrue(allPixelsEqualTo(dst, 135)); }