wpf - 将 PNG 文件导入 Wpf Canvas

Question

所以，I have imported the canvas into a png file.

保存画布的代码是：

private void CommandBinding_Executed(object sender, RoutedEventArgs e)
        {
            Rect rect = new Rect(canvas1.RenderSize);
            RenderTargetBitmap rtb = new RenderTargetBitmap((int)rect.Right,
              (int)rect.Bottom, 96d, 96d, System.Windows.Media.PixelFormats.Default);
            rtb.Render(canvas1);
            //endcode as PNG
            Microsoft.Win32.SaveFileDialog dl1 = new Microsoft.Win32.SaveFileDialog();
            dl1.FileName = "Sample Image";
            dl1.DefaultExt = ".png";
            dl1.Filter = "Image documents (.png)|*.png";
            Nullable<bool> result = dl1.ShowDialog();
            if (result == true)
            {
                string filename = dl1.FileName;
                BitmapEncoder pngEncoder = new PngBitmapEncoder();
                pngEncoder.Frames.Add(BitmapFrame.Create(rtb));

                //save to memory stream
                System.IO.MemoryStream ms = new System.IO.MemoryStream();

                pngEncoder.Save(ms);
                ms.Close();
                System.IO.File.WriteAllBytes(filename, ms.ToArray());
                Console.WriteLine("Done");

            }

        }

现在I want to import an image (png file) back to canvas in my application,

即在 WPF 画布中打开 png 图像。

因此，请转储c#可以将任何图像文件导入 WPF 画布的代码。

Answer 1

我相信这就是你要找的？

ImageBrush brush = new ImageBrush();
brush.ImageSource = new BitmapImage(new Uri(@"mypictures\savedimage.png", UriKind.Relative));
canvas.Background = brush;

Answer 2

感谢 Krishna，最好的解决方案是：

private void Open_Image(object sender, RoutedEventArgs e)
{
    Microsoft.Win32.OpenFileDialog dl1 = new Microsoft.Win32.OpenFileDialog();
    dl1.FileName = "MYFileSave";
    dl1.DefaultExt = ".png";
    dl1.Filter = "Image documents (.png)|*.png";
    Nullable<bool> result = dl1.ShowDialog();

    if (result == true)
    {
        string filename = dl1.FileName;
        ImageBrush brush = new ImageBrush();
        brush.ImageSource = new BitmapImage(new Uri(@filename, UriKind.Relative));
        canvas1.Background = brush;
    }
}