WebClient实现kindeditor跨域上传图片

 HttpPostedFile imgFile = context.Request.Files["imgFile"];//KIndEditor上传的文件
//将imgFile转换成字节形式
        byte[] fileByte = new byte[imgFile.InputStream.Length];
        imgFile.InputStream.Read(fileByte, 0, fileByte.Length);
  //通过WebClient提交文件
//本地地址做测试，端口不同，实现域不同
//图片服务器 http://192.168.0.107:81/
//本地 http://192.168.0.107:80/
        string pUrl = string.Format("http://192.168.0.107:81/");
        string postUrl = string.Format("{0}kindeditor/asp.net/upload_json.ashx?img={1}&path={2}&action={3}", pUrl, imgFile.FileName, path, action);
        System.Net.WebClient webClient = new System.Net.WebClient();
//上传数据
        byte[] responseArray = webClient.UploadData(postUrl, "POST", fileByte);
        string result = System.Text.Encoding.Default.GetString(responseArray, 0, responseArray.Length);
//对返回的数据进行根据KindEditor的样式进行json解析，需要的是Newtonsoft.dll
        hash bk = Newtonsoft.Json.JsonConvert.DeserializeObject<hash>(result);
        Hashtable hash = new Hashtable();
        hash["error"] = 0;
        //hash["error"]=bk.error;这样竟然无效
        hash["url"] = string.Format("{0}{1}", pUrl, bk.url);

//获得图片
        System.Drawing.Image postImage = System.Drawing.Image.FromStream(context.Request.InputStream);
               
        //保存
        System.Drawing.Bitmap bitmap_b = new System.Drawing.Bitmap(postImage);
        bitmap_b.Save(filePath);

//String dirPath = context.Server.MapPath(savePath);//相对路径
String dirPath = savePath;//这里改为绝对路径

删除的图片是http://192.168.1.1/k/2012/1212.jmg
通过判断是否存在http://头
http://192.168.1.1/k/2012/1212.jpg转换为物理绝对路径"D:\项目/k/2012/1212.jpg
 如果是外部引入的文件则返回原地址
 if (strPath.ToLower().StartsWith("http://"))
            {
                if (strPath.IndexOf(ManagerUrl) >= 0)
                {
                    strPath = strPath.Replace(ManagerUrl, ManagerPath);
                    return strPath;
                }
                else
                {
                    return strPath;
                }
            }
    }