C#：如何使用最大高度按比例调整图像大小

我需要在不改变宽高比的情况下按比例调整图像大小.我有使用固定高度和宽度调整大小的代码,但我需要按最大高度(比如600像素)按比例调整图像大小.如何修改代码以满足我的要求？

public static void Main()
{
  var image = Image.FromFile(@"c:\logo.png");
  var newImage = ScaleImage(image, 300, 400);
  newImage.Save(@"c:\test.png", ImageFormat.Png);
}

public static Image ScaleImage(Image image, int maxWidth, int maxHeight)
 {
  var ratioX = (double)maxWidth / image.Width;
  var ratioY = (double)maxHeight / image.Height;
  var ratio = Math.Min(ratioX, ratioY);

  var newWidth = (int)(image.Width * ratio);
  var newHeight = (int)(image.Height * ratio);

  var newImage = new Bitmap(newWidth, newHeight);
  Graphics.FromImage(newImage).DrawImage(image, 0, 0, newWidth, newHeight);
  return newImage;
}

请提供宝贵的意见.

解决方法:

这几乎感觉很容易,我觉得我错过了什么.无论如何,这不会有诀窍吗？

public static Image ScaleImage(Image image, int maxHeight) 
{ 
    var ratio = (double)maxHeight / image.Height; 

    var newWidth = (int)(image.Width * ratio); 
    var newHeight = (int)(image.Height * ratio); 

    var newImage = new Bitmap(newWidth, newHeight); 
    using (var g = Graphics.FromImage(newImage))
    {
        g.DrawImage(image, 0, 0, newWidth, newHeight); 
    }
    return newImage; 
} 

标签：c,asp-net,aspect-ratio,image-resizing
来源： https://codeday.me/bug/20190530/1183515.html