C#抓取网络图片保存到本地的实现方法

System.Net.WebClient myWebClient = new System.Net.WebClient();  //将头像保存到服务器     string virPath = "/Uploads/AppImage/" + user.Id + "/";     CreateDir(virPath);     string fileName = Guid.NewGuid().ToString() + ".png";     myWebClient.DownloadFile(headimgurl, System.Web.HttpContext.Current.Request.PhysicalApplicationPath + virPath + fileName);     user.Portrait = virPath + fileName;

#region 创建目录  /// <summary>  /// 创建目录  /// </summary>  /// <param name="dir">要创建的目录路径包括目录名</param>  public static void CreateDir(string dir)  {   if (dir.Length == 0) return;   if (!Directory.Exists(System.Web.HttpContext.Current.Request.PhysicalApplicationPath + "//" + dir))    Directory.CreateDirectory(System.Web.HttpContext.Current.Request.PhysicalApplicationPath + "//" + dir)     ;  }  #endregion