无法尝试/捕获错误

Question

我正在使用contoso university wb app。但我无法发现错误。

控制器：

public ActionResult Create(Student student)
        {
            try
            {
                if (ModelState.IsValid)
                {
                    studentService.Add(student);
                    studentService.Update(student);
                    return RedirectToAction("Index");
                }
            }
            catch (DataException /* dex */)
            {
                //Log the error (uncomment dex variable name and add a line here to write a log.
                ModelState.AddModelError("", "Unable to save changes. Try again, and if the problem persists see your system administrator.");
            }
            return View(student);
        }

这是错误的图像：

https://www.dropbox.com/s/2sw5gor3x2d1lpi/111111.jpg?dl=0

Answer 1

其实你正在抓错误！ 这就是为什么您的错误消息"Unable to save changes. Try again, and if the problem persists see your system administrator."在浏览器中正常显示，并且没有运行时错误说明发生了异常。