Web/Default.aspx.cs

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Web
{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        private string picPath="images/Watermark_" ;
        private string pic="";
        private List<string> list = new List<string>();
        protected void btnUpload_Click(object sender, EventArgs e)
        {
            //上传图片并保存
            HttpPostedFile imgfile = Context.Request.Files[0];
           pic = picPath+ DateTime.Now.ToString("yyyy-MM-dd_HHmmss") + ".jpg";
            imgfile.SaveAs(Context.Request.MapPath(pic));

            Image1.ImageUrl = pic;
            Session["pic"] = pic;
        }

        protected void btnAddWatermark_Click(object sender, EventArgs e)
        {
            string waterPic = picPath + DateTime.Now.ToString("yyyy-MM-dd_HHmmss") + "_0.jpg";
            string op = Session["pic"].ToString();
            //创建位图，位图来自image文件
            using (Bitmap map = (Bitmap)Bitmap.FromFile(Context.Request.MapPath(Session["pic"].ToString())))
            {
                using (Graphics g = Graphics.FromImage(map))
                {
                    //画水印文字在位图上
                    g.DrawString(TextBox1.Text, new Font("黑体",200.0f, FontStyle.Bold), Brushes.Red, new PointF(map.Width - 800, map.Height - 600));
                    //将画好水印文字的位图保存
                   
                    map.Save(Context.Request.MapPath(waterPic));
                }
            }

            Image2.ImageUrl = waterPic;
        }
    }
}