Question

我正在尝试将HTML表从一个控制器发送到另一个控制器，但是由于表的大小，我遇到了HTTP 400错误。我认为这些错误来自比框架更低的级别，因为它只是原始的HTTP 400错误，而不是堆栈，查询等错误，就像调试时的正常异常一样。

如果我将DataTable的大小限制为一行，它就可以正常工作。但是一旦超过两行或三行，查询字符串的长度就足够长了，它将开始引发错误。

我尝试将DataTable本身传递到MailboxRulesResults，然后使用List<object>从那里进行从DataTable到HTML表的转换，但是DataTable从未实现该功能。

是否有更好的方法可以做到这一点？还是需要在某个地方调整配置？

预先感谢

        [HttpPost, ValidateAntiForgeryToken]
        public IActionResult GetMailboxRules(MailboxRulesModel mailbox)
        {
            string currentuser = HttpContext.User.FindFirst("preferred_username")?.Value;
            string guid = Guid.NewGuid().ToString();
            using (DataTable results = Mail.GetMailboxRules(mailbox.EmailAddress, guid, currentuser))
            {
                List<string> return_list = new List<string>
                {
                    UtilityFunctions.ConvertDataTableToHTML(results, guid),
                    guid
                };
                return RedirectToAction("MailboxRulesResults", "Mail", new { data = return_list });
            }
        }
        [HttpPost, ValidateAntiForgeryToken]
        public IActionResult MailboxRulesResults(List<string> data)
        {
            ViewBag.TableHTML = data[0];
            ViewBag.Guid = data[1];
            return View();
        }

Answer 1

最终从更改了我的原始视图

<form asp-controller="Mail" asp-action="GetMailboxRules" method="post"

到

<form asp-controller="Mail" asp-action="MailboxRulesResults" method="post"

然后让MailboxRulesResults操作处理所有事情。

 [HttpPost, ValidateAntiForgeryToken]
        public IActionResult MailboxRulesResults(MailboxRulesModel mailbox)
        {
            string currentuser = HttpContext.User.FindFirst("preferred_username")?.Value;
            string guid = Guid.NewGuid().ToString();
            List<MailboxRulesModel> rules = Mail.GetMailboxRules(mailbox.EmailAddress, guid, currentuser);
            using (DataTable dt = UtilityFunctions.CreateDataTable(rules))
            {
                string html = UtilityFunctions.ConvertDataTableToHTML(dt, guid);
                ViewBag.TableHTML = html;
                ViewBag.Guid = guid;
                return View();
            }
        }

Answer 2

只需执行以下操作，然后将表另存为服务器上的文本文件即可，而不是在下一个请求时获取。

   private IHostingEnvironment _env;
       var webRoot = _env.WebRootPath;
           var file = System.IO.Path.Combine(webRoot, "table.txt");
 [HttpPost, ValidateAntiForgeryToken]
    public IActionResult GetMailboxRules(MailboxRulesModel mailbox)
    {

        string currentuser = HttpContext.User.FindFirst("preferred_username")?.Value;
        string guid = Guid.NewGuid().ToString();
        using (DataTable results = Mail.GetMailboxRules(mailbox.EmailAddress, guid, currentuser))
        {
            List<string> return_list = new List<string>
            {
                UtilityFunctions.ConvertDataTableToHTML(results, guid),
                guid
            };

          using(TextWriter tw = new StreamWriter(file))
          {
          foreach (string s in return_list)
           tw.WriteLine(s);  
          }
            return {Your action method without parameter}
        }
    }

然后检索：

[HttpPost, ValidateAntiForgeryToken]
    public IActionResult MailboxRulesResults(List<string> data)
    {

       using (StreamReader sr = new StreamReader(file))
        {

            String line;
            // Read line by line
            while ((line = sr.ReadLine()) != null)
            {
                Console.WriteLine(line);                

            }
        }
        ViewBag.TableHTML = line;
        ViewBag.Guid = data[1];
        return View();
    }

如何将大字符串从一个控制器传递到另一个控制器？

2 个答案: