下载文件时报错 "由于代码已经过优化或者本机框架位于调用堆栈之上,无法计算表达式的值" 解决方法

下载文件的代码

 /// <summary>
    /// 下载文件操作类
    /// </summary>
    public static class DownLoadFiles
    {
        /// <summary>  
        /// 下载文件
        /// </summary>
        /// <param name="strDownLoadFileName">要下载的文件名称</param>
        /// <returns></returns>
        public static void DownLoadFile(string strDownLoadFileName)
        {
            if (String.IsNullOrEmpty(strDownLoadFileName))return;
            try
            {
                FileInfo info = new FileInfo(strDownLoadFileName);
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(info.Name));
                HttpContext.Current.Response.AddHeader("Content-Length", info.Length.ToString());
                HttpContext.Current.Response.ContentType = "application/octet-stream";//ms-excel
                HttpContext.Current.Response.WriteFile(info.FullName);
                //HttpContext.Current.Response.End();
                HttpContext.Current.ApplicationInstance.CompleteRequest();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
    }

// 最初是 HttpContext.Current.Response.End() 总是报错，异常“由于代码已经过优化或者本机框架位于调用堆栈之上,无法计算表达式的值”后来将上面的"HttpContext.Current.Response.End();"改成"HttpContext.Current.ApplicationInstance.CompleteRequest();",这个问题就自然的解决了。