一般为Catch缓存没有给权限,也没有设置，加上以下代码即可：

HttpContext.Current.Response.ClearHeaders();
HttpContext.Current.Response.AppendHeader( "Expires ", System.DateTime.Now.AddMinutes(30).ToString());
HttpContext.Current.Response.AppendHeader( "Pragma ", "public ");
HttpContext.Current.Response.AppendHeader( "Cache-Control ", "must-revalidate, post-check=0, pre-check=0 ");
HttpContext.Current.Response.AppendHeader( "Cache-Control ", "public ");