C# 远程图片下载到本地

下载方法

using System;
using System.Net;
using System.IO;
using System.Text;
namespace Common
{
    /// <summary>
    /// 下载远程图片保存到本地地址
    /// </summary>
    public class DowloadWXImg
    {
        /// <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 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");