通過WebRequest擷取遠程網頁圖片

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Net;

namespace WebRequest
{
 /// <summary>
 /// 捷 2005-5-7
 /// 通過WebRequest擷取遠程網頁圖片
 /// </summary>
 public class WebForm1 : System.Web.UI.Page
 {
  protected System.Web.UI.WebControls.TextBox TextBox1;
  protected System.Web.UI.WebControls.Button Button1;
 
  private void Page_Load(object sender, System.EventArgs e)
  {
   // 在此處放置使用者代碼以初始化頁面
  }

  #region Web Form設計器產生的程式碼
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN: 該調用是 ASP.NET Web Form設計器所必需的。
   //
   InitializeComponent();
   base.OnInit(e);
  }
  
  /// <summary>
  /// 設計器支援所需的方法 - 不要使用代碼編輯器修改
  /// 此方法的內容。
  /// </summary>
  private void InitializeComponent()
  {   
   this.Button1.Click += new System.EventHandler(this.Button1_Click);
   this.Load += new System.EventHandler(this.Page_Load);

  }
  #endregion

  private void Button1_Click(object sender, System.EventArgs e)
  {
   try
   {
    string imgpath = this.TextBox1.Text;
    string file_name = "1.jpg";
    HttpWebRequest wrequest;
    HttpWebResponse wresponse;
    Stream s;
    wrequest = (HttpWebRequest)HttpWebRequest.Create(imgpath);
    wresponse = (HttpWebResponse)wrequest.GetResponse();
    s = wresponse.GetResponseStream();
    System.Drawing.Image simg = System.Drawing.Image.FromStream(s);   
    Bitmap newimg = new Bitmap(simg);
    int x = newimg.Width-100;
    int y = newimg.Height-25;
    if(y >= 200 && x >= 200)
    {
     Graphics g = Graphics.FromImage(newimg);
     g.FillRectangle(new LinearGradientBrush(new Point(0,0), new Point(100,25),Color.Black, Color.Black),x,y,100,25); //Color.FromArgb(0,0,0,0)
     g.DrawString(" My World", new Font("黑體",13),new SolidBrush(Color.White),new PointF(x+4,y+3));//,FontStyle.Bold
    }
    newimg.Save(Server.MapPath("images/") + file_name,System.Drawing.Imaging.ImageFormat.Jpeg);
   }
   catch
   {
    Response.Redirect("~/error.htm?msg=" + Server.UrlEncode("未找到檔案！"));
   }
  }
 }
}