App_Code/UpLoad.cs

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using System;
using System.Web;
using System.IO;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;


    public class UpLoad
    {

        private SysSet sysset;
        private string filePath; //上传目录名
        private readonly string fileType; //文件类型
        private readonly int fileSize; //文件大小0为不限制
        private readonly int isWatermark; //0为不加水印，1为文字水印，2为图片水印
        private readonly int waterStatus; //水印位置
        private readonly int waterQuality; //水印图片质量
        private readonly string imgWaterPath; //水印图片地址
        private readonly int waterTransparency; //水印图片透时度
        private readonly string textWater; //水印文字
        private readonly string textWaterFont; //文字水印字体
        private readonly int textFontSize; //文字大小

        public static string SaveCutPic(string pPath, string pSavedPath, int pPartStartPointX, int pPartStartPointY, int pPartWidth, int pPartHeight, int pOrigStartPointX, int pOrigStartPointY, int imageWidth, int imageHeight)
        {
            using (Image originalImg = Image.FromFile(pPath))
            {
                if (originalImg.Width == imageWidth && originalImg.Height == imageHeight)
                {
                    return SaveCutPic(pPath, pSavedPath, pPartStartPointX, pPartStartPointY, pPartWidth, pPartHeight,
                            pOrigStartPointX, pOrigStartPointY);

                }
                string filename = DateTime.Now.ToString("yyyyMMddHHmmss") + ".jpg";
                string filePath = pSavedPath + "\\" + filename;

                Bitmap thumimg = MakeThumbnail(originalImg, imageWidth, imageHeight);

                Bitmap partImg = new Bitmap(pPartWidth, pPartHeight);

                Graphics graphics = Graphics.FromImage(partImg);
                Rectangle destRect = new Rectangle(new Point(pPartStartPointX, pPartStartPointY), new Size(pPartWidth, pPartHeight));//目标位置
                Rectangle origRect = new Rectangle(new Point(pOrigStartPointX, pOrigStartPointY), new Size(pPartWidth, pPartHeight));//原图位置（默认从原图中截取的图片大小等于目标图片的大小）

                ///文字水印  
                Graphics G = Graphics.FromImage(partImg);
                //Font f = new Font("Lucida Grande", 6);
                //Brush b = new SolidBrush(Color.Gray);
                G.Clear(Color.White);
                // 指定高质量的双三次插值法。执行预筛选以确保高质量的收缩。此模式可产生质量最高的转换图像。 
                G.InterpolationMode = InterpolationMode.HighQualityBicubic;
                // 指定高质量、低速度呈现。 
                G.SmoothingMode = SmoothingMode.HighQuality;

                graphics.DrawImage(thumimg, destRect, origRect, GraphicsUnit.Pixel);
                //G.DrawString("Xuanye", f, b, 0, 0);
                G.Dispose();

                originalImg.Dispose();