PictureBox 在导航到不同的应用程序时丢失其图像

PictureBox loses its image on navigating to different application

我最近开始开发 Windows 表单应用程序。我正在使用 PictureBox,但遇到了问题。当我导航出去或将其最小化并重新打开时,它正在丢失如下图所示的图像。任何帮助是极大的赞赏。

private void button1_Click(object sender, EventArgs e) {
        try {
            using (FileStream fs = new FileStream("C:\Users\Public\Pictures\Sample Pictures\Penguins.jpg", FileMode.Open, FileAccess.Read)) {
                using (Image original = Image.FromStream(fs)) {
                    Bitmap image1 = (Bitmap)original;
                    pictureBox1.Image = image1;
                    pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
                    pictureBox1.Refresh();
                }
            }

        }
        catch (System.IO.FileNotFoundException) {
            MessageBox.Show("There was an error opening the bitmap." +
                "Please check the path.");
        }
    }

Forms Application before Navigating

Forms Application after Navigating to another app or minimizing it

这是因为您正在处理图片

using (Image original = ....
{
    Bitmap image1 = (Bitmap)original;
    // ...
}

image1original 是同一个对象,只是转换为 Bitmap,并在绘制到屏幕上后立即处理(使用 Refresh 方法)。

要解决此问题,请改用以下方法

Bitmap image1 = new Bitmap(original);
// ...