public static void MakeThumNail(string originalImagePath, string thumNailPath, int width, int height, string model)

    {

        System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);



        int thumWidth = width; //缩略图的宽度

        int thumHeight = height; //缩略图的高度



        int x = 0;

        int y = 0;



        int originalWidth = originalImage.Width; //原始图片的宽度

        int originalHeight = originalImage.Height; //原始图片的高度



        switch (model)

        {

            case "HW": //指定高宽缩放,可能变形

                break;

            case "W": //指定宽度,高度按照比例缩放

                thumHeight = originalImage.Height * width / originalImage.Width;

                break;

            case "H": //指定高度,宽度按照等比例缩放

                thumWidth = originalImage.Width * height / originalImage.Height;

                break;

            case "Cut":

                if ((double)originalImage.Width / (double)originalImage.Height > (double)thumWidth / (double)thumHeight)

                {

                    originalHeight = originalImage.Height;

                    originalWidth = originalImage.Height * thumWidth / thumHeight;