上传图片加水印

using  System;
using  System.Collections;
using  System.ComponentModel;
using  System.Data;
using  System.Drawing;
using  System.Web;
using  System.Web.SessionState;
using  System.Web.UI;
using  System.Web.UI.WebControls;
using  System.Web.UI.HtmlControls;
using  System.IO;

namespace  MikeCat
{
    /**//// <summary>
    /// MikeCat_WaterMark 的摘要说明。
    /// *******************************
    /// 作者：迈克老猫
    /// 功能：上传图片加入水印
    /// EMAIL：mikecat#mikecat.net
    /// *******************************
    /// </summary>
    public class MikeCat_WaterMark : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.Button Button1;
        protected System.Web.UI.HtmlControls.HtmlInputFile File1;
        protected System.Web.UI.WebControls.Image Image1;
        protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator1;
        protected System.Web.UI.WebControls.Label Label1;
        protected System.Web.UI.WebControls.Button Button2;
    
        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
            if(!Page.IsPostBack)
            {
                Image1.ImageUrl="mikepp.gif";
            }
        }

        Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /**//// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {    
            this.Button1.Click += new System.EventHandler(this.Button1_Click);
            this.Button2.Click += new System.EventHandler(this.Button2_Click);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion

        private void Button1_Click(object sender, System.EventArgs e)
        {
            if(File1.PostedFile.FileName.Trim()!="")
            {
                //上传文件
                string extension = Path.GetExtension(File1.PostedFile.FileName).ToLower();
                string fileName = DateTime.Now.ToString("yyyyMMddhhmmss");
                string path = Server.MapPath(".") + "/upload/" + fileName + extension;
                File1.PostedFile.SaveAs(path);

                //加文字水印，注意，这里的代码和以下加图片水印的代码不能共存
                System.Drawing.Image image = System.Drawing.Image.FromFile(path);
                Graphics g = Graphics.FromImage(image);
                g.DrawImage(image, 0, 0, image.Width, image.Height);
                Font f = new Font("Verdana",16);
                Brush b = new SolidBrush(Color.Blue);
                string addText = "老猫的理想http://www.mikecat.net";
                g.DrawString(addText, f, b, 10, 10);
                g.Dispose();

                //保存加水印过后的图片,删除原始图片
                string newPath = Server.MapPath(".") + "/upload/" + fileName + "_new" + extension;
                image.Save(newPath);
                image.Dispose();
                if(File.Exists(path))
                {
                    File.Delete(path);
                }
        
                Image1.ImageUrl=newPath;
//                Response.Redirect(newPath);
            }

        }

        private void Button2_Click(object sender, System.EventArgs e)
        {
            //上传文件
            string extension = Path.GetExtension(File1.PostedFile.FileName).ToUpper();
            string fileName = DateTime.Now.ToString("yyyyMMddhhmmss");
            string path = Server.MapPath(".") + "/upload/" + fileName + extension;
            File1.PostedFile.SaveAs(path);

            
            //加图片水印
            System.Drawing.Image image = System.Drawing.Image.FromFile(path);
            System.Drawing.Image copyImage = System.Drawing.Image.FromFile( Server.MapPath(".") + "/mikepp.gif");
            Graphics g = Graphics.FromImage(image);
            g.DrawImage(copyImage, new Rectangle(image.Width-copyImage.Width, image.Height-copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
            g.Dispose();

            //保存加水印过后的图片,删除原始图片
            string newPath = Server.MapPath(".") + "/upload/" + fileName + "_new" + extension;
            image.Save(newPath);
            image.Dispose();
            if(File.Exists(path))
            {
                File.Delete(path);
            }

            Image1.ImageUrl=newPath;
        }
    }
}