在c#中调整图像大小并保存此图像

我有一些任务-如果高度或宽度>500px，则调整图像大小。我尝试这个代码。

但当我选择图像时，我会出现类似的错误

NewImage.Save（路径）；

ВGDI+一般形式的错误。

private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog fdlg = new OpenFileDialog();
            fdlg.Multiselect = true;
            if (fdlg.ShowDialog() == DialogResult.OK)
            {
                for (int i = 0; i < fdlg.FileNames.Length; i++)
                {
                    string file = fdlg.FileNames[i];
                    string path = System.IO.Path.GetFullPath(file);
                    System.Drawing.Image img = System.Drawing.Image.FromFile(path);
                    if (img.Width > 500 || img.Height > 500)
                    {
                        int currW = img.Width;
                        int currH = img.Height;
                        int realWPer = 500 * 100 / currW;
                        int realHPer = 500 * 100 / currH;
                        int realW = currW / 100 * realWPer; // new width
                        int realH = currH / 100 * realHPer; // new height
                        Image NewImage = resizeImage(img, new Size(realW, realH));
                        NewImage.Save(path);
                    }
                }
            }
        }
public static Image resizeImage(Image imgToResize, Size size)
{
   return (Image)(new Bitmap(imgToResize, size));
}