c#根据路径（url）下载图片

方法一：根据路径下载图片

1 /// <summary>
 /// 图片另存为
 /// </summary>
 /// <param name="url">路径</param>
 public void ImgSave(string url)
 {
 　　//http://203.156.245.58/sipgl/index.jsp
 　　url = "http://203.156.245.58/sipgl/login/img";
 　　WebRequest imgRequest = WebRequest.Create(url);

 　　HttpWebResponse res;
 　　try
 　　{
 　　　　res = (HttpWebResponse)imgRequest.GetResponse();
 　　}
 　　　　catch (WebException ex)
 　　{

 　　res = (HttpWebResponse)ex.Response;
 　　}

 　　if (res.StatusCode.ToString() == "OK")
 　　{
 　　　　System.Drawing.Image downImage = System.Drawing.Image.FromStream(imgRequest.GetResponse().GetResponseStream());

 　　　　string deerory = string.Format(@"D:\img\{0}\", DateTime.Now.ToString("yyyy-MM-dd"));

 　　　　string fileName = string.Format("{0}.png", DateTime.Now.ToString("HHmmssffff"));

 　　if (!System.IO.Directory.Exists(deerory))
 　　{
 　　　　System.IO.Directory.CreateDirectory(deerory);
 　　}
 　　　　downImage.Save(deerory + fileName);
 　　　　downImage.Dispose();
 　　}

 }

方法二：根据路径下载图片

      /// <summary>
         /// 下载图片
         /// </summary>
         /// <param name="picUrl">图片Http地址</param>
         /// <param name="savePath">保存路径</param>
         /// <param name="timeOut">Request最大请求时间，如果为-1则无限制</param>
         /// <returns></returns>
         public  bool DownloadPicture(string picUrl, string savePath, int timeOut)
         {
             picUrl = "http://203.156.245.58/sipgl/login/img";
             savePath = "D:/img/"+DateTime.Now.ToString("HHmmssffff")+".jpg";
             bool value = false;
             WebResponse response = null;
             Stream stream = null;
             try
             {
                 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(picUrl);
                 if (timeOut != -) request.Timeout = timeOut;
                 response = request.GetResponse();
                 stream = response.GetResponseStream();
                 if (!response.ContentType.ToLower().StartsWith("text/"))
                     value = SaveBinaryFile(response, savePath);
             }
             finally
             {
                 if (stream != null) stream.Close();
                 if (response != null) response.Close();
             }
             return value;
         }
         private static bool SaveBinaryFile(WebResponse response, string savePath)
         {
             bool value = false;
             byte[] buffer = new byte[];
             Stream outStream = null;
             Stream inStream = null;
             try
             {
                 if (File.Exists(savePath)) File.Delete(savePath);
                 outStream = System.IO.File.Create(savePath);
                 inStream = response.GetResponseStream();
                 int l;
                 do
                 {
                     l = inStream.Read(buffer, , buffer.Length);
                     if (l > ) outStream.Write(buffer, , l);
                 } while (l > );
                 value = true;
             }
             finally
             {
                 if (outStream != null) outStream.Close();
                 if (inStream != null) inStream.Close();
             }
             return value;
         }

方法三  根据路径下载图片

     public Image GetImage(string url,out string imageStrCookie)
         {

             HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://203.156.245.58/sipgl/login/img");
             request.Method = "GET";
             WebResponse response = request.GetResponse();
             imageStrCookie = "";
             if (response.Headers.HasKeys()&&null !=response.Headers["Set-Cookie"])
             {
                 imageStrCookie= response.Headers.Get("Set-Cookie");
             }
             return Image.FromStream(response.GetResponseStream());

         }