如何在MVC C#中根据主图像或输出图像的大小来增大或减小水印图像的大小

using System.Drawing;

public class WatermarkProcessor
{
    public void ResizeWatermarkImage(string watermarkImagePath, string mainImagePath, string outputImagePath)
    {
        // 加载水印图像
        Image watermarkImage = Image.FromFile(watermarkImagePath);

        // 获取主图像或输出图像的宽度和高度
        Image mainImage = Image.FromFile(mainImagePath);
        int mainImageWidth = mainImage.Width;
        int mainImageHeight = mainImage.Height;

        // 计算水印图像需要调整的宽度和高度
        int watermarkWidth = watermarkImage.Width;
        int watermarkHeight = watermarkImage.Height;
        double widthRatio = (double)mainImageWidth / watermarkWidth;
        double heightRatio = (double)mainImageHeight / watermarkHeight;
        double resizeRatio = Math.Min(widthRatio, heightRatio);
        int newWatermarkWidth = (int)(watermarkWidth * resizeRatio);
        int newWatermarkHeight = (int)(watermarkHeight * resizeRatio);

        // 调整水印图像的大小
        Bitmap resizedWatermarkImage = new Bitmap(newWatermarkWidth, newWatermarkHeight);
        using (Graphics graphics = Graphics.FromImage(resizedWatermarkImage))
        {
            graphics.DrawImage(watermarkImage, new Rectangle(0, 0, newWatermarkWidth, newWatermarkHeight));
        }

        // 将调整后的水印图像应用于主图像或输出图像
        using (Graphics graphics = Graphics.FromImage(mainImage))
        {
            graphics.DrawImage(resizedWatermarkImage, new Point(0, 0));
        }

        // 保存主图像或输出图像
        mainImage.Save(outputImagePath);

        // 释放资源
        mainImage.Dispose();
        watermarkImage.Dispose();
        resizedWatermarkImage.Dispose();
    }
}