下载方法

using System;using System.Net;using System.IO;using System.Text;namespace Common{    /// 
    /// 下载远程图片保存到本地地址    /// 
    public class DowloadWXImg    {        /// 
        /// 下载图片        /// 
        /// 图片Http地址        /// 保存路径        /// Request最大请求时间，如果为-1则无限制        /// 
             public static bool DownloadPicture(string picUrl, string savePath, int timeOut=-1)        {                       bool value = false;                    WebResponse response = null;                      Stream stream = null;            try            {                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(picUrl);                if (timeOut != -1) request.Timeout = timeOut;                response = request.GetResponse();                stream = response.GetResponseStream();                if (!response.ContentType.ToLower().StartsWith("text/"))                    value = SaveBinaryFile(response, savePath);            }            catch (Exception e) {                LogHelper.AddErrorLog("下载远程图片失败:"+e.ToString());            }            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[1024];            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, 0, buffer.Length);                    if (l > 0) outStream.Write(buffer, 0, l);                } while (l > 0);                value = true;            }            finally            {                if (outStream != null) outStream.Close();                if (inStream != null) inStream.Close();            }            return value;        }    }}

　　

流程：

string img = "/Img/CustomerHeadImg/" + OrgID;             //string SavaWxImage = Server.MapPath(img); //该方法是获取网站所在的根目录 　　　　　　　　　　//

//System.AppDomain.CurrentDomain.BaseDirectory 这个方法 是获取网站下面的应用程序目录

string SavaWxImage = System.AppDomain.CurrentDomain.BaseDirectory+img;      　　   if (!Directory.Exists(SavaWxImage))//是否存在文件夹,没存在则创建                    Directory.CreateDirectory(SavaWxImage);                bool isWXImg = DowloadWXImg.DownloadPicture(wxImage, SavaWxImage+"/" + unionid + ".jpg");