C# 之 服务端下载远程文件

            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(path);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream stream = response.GetResponseStream();
            int count = Int32.Parse(stream.Length.ToString());
            //方法一
            byte[] buffer = new byte[count];
            stream.Read(buffer, 0, buffer.Length);
            stream.Close();
            FileStream fs = new FileStream(AppDomain.CurrentDomain.BaseDirectory + ImgIndex.ToString() + ".jpg", FileMode.OpenOrCreate, FileAccess.Write);
            fs.Write(buffer, 0, buffer.Length);
            fs.Flush();
            fs.Close();

string url = "http://www.example.com";　　　　　　  
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(path);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream responseStream = response.GetResponseStream();

            System.Drawing.Image image = System.Drawing.Image.FromStream(responseStream);
            responseStream.Close();

            DateTime date = System.DateTime.Now;

            string timeCur = String.Format("{0}/{1}/{2}", date.Year, date.ToString("yyyyMM"), date.ToString("yyyy-MM-dd"));
            string folder = Server.MapPath("../upload/") + timeCur + "/";//上传文件夹。相对路径

            //自动创建文件夹
            if (!Directory.Exists(folder))
            {
                Directory.CreateDirectory(folder);
            }
            string FileName = DateTime.Now.ToString("HHmmssffff");
            image.Save(folder + FileName + ".jpeg", System.Drawing.Imaging.ImageFormat.Jpeg);

            image.Dispose(); //释放资源
            response.Close();

        //通过WebClient下载网页的源码    
        string url = "http://www.example.com";
        System.Net.WebClient client = new System.Net.WebClient();
        client.Encoding = System.Text.Encoding.UTF8;
        string strHtml = client.DownloadString(url);