使用Jquery对话框在MVC中编辑/添加记录不会在对话框中显示来自服务器的错误

在这里，我使用相同的局部视图、get和post方法为这两个操作添加、编辑jquery对话框窗口。 这就是我在单击时打开对话框的方式（下面显示的对话框用于创建新记录）

这是我将内容加载到Jquery对话框的部分视图

@using (Html.BeginForm("AddEditRecord", "Home"))
{
    @Html.ValidationSummary(true)

    <fieldset>
        <legend>Student</legend>
    <div class="editor-field">
            @Html.HiddenFor(model => model.StudentID)
        @Html.ValidatioMessageFor(model =>model.StudentID)
    </div>
        <div class="editor-label">
            @Html.EditFor(model => model.Name)   
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Name)
            @Html.ValidationMessageFor(model => model.Name)
        </div>
        <div class="editor-label">
            @Html.LabelFor(model => model.Age)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Age)
            @Html.ValidationMessageFor(model => model.Age)
        </div>
        <div class="editor-label">
            @Html.LabelFor(model => model.State)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.State)
            @Html.ValidationMessageFor(model => model.State)
        </div>
        <div class="editor-label">
            @Html.LabelFor(model => model.Country)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.Country)
            @Html.ValidationMessageFor(model => model.Country)
        </div>
        <p>
            @if (ViewBag.IsUpdate == true)
            {
                <input type="submit" value="Update" id="btnUpdate" name="cmd"/>
            }
            else
            {
                <input type="submit" value="Save" id="btnSave" name="cmd"/>
            }
            @Html.ActionLink("Back to List", "Index")
        </p>
    </fieldset>
}

下面是我在对话框表单中输入详细信息后提交记录的Post方法 对话框数据将发布到此方法

[HttpPost]
public ActionResult AddEditRecord(Student student, string cmd)
{
   if (ModelState.IsValid)
   {
      if (cmd == "Save")
      {
         try
         {
            Student student = db.Students.Where(m => m.StudentID == id).FirstOrDefault();
            if(student!=null)
            {
               db.Students.Add(student);
               db.SaveChanges();
               return RedirectToAction("Index");
            }
            else
            {
               ModelState.Error("", "Record already exists");
               return PartialView("_StudentData", student);
            }   
         }
         catch { }
      }
         else
         {
            try
             {
               Student stud = db.Students.Where(m => m.StudentID == student.StudentID).FirstOrDefault();
               if (stud != null)
               {
                  stud.Name = student.Name;
                  stud.Age = student.Age;
                  stud.State = student.State;
                  stud.Country = student.Country;
                  db.SaveChanges();
                  return RedirectToAction("Index");
               }
             }
             catch { }
         }
      }
     return PartialView("_StudentData", student);
}

提交模式验证时，对话框本身显示错误， 当用户提交记录时，我尝试在帖子中做同样的操作。这将检查表中是否有重复的StudentID。如果没有，记录将保存到数据库并重定向到索引（学生列表页面）。 但是如果有记录存在，那么我想在对话框中向用户显示一个具有相同学生ID的记录存在，但是UI重定向，并且对话框显示在父窗口而不是对话框中。

---

我做了一些研究，但没有找到解决办法。

使用ajax表单代替html表单也尝试过，但仍然重定向到主窗口。

[HttpGet]
        public ActionResult AddEditRecord(int id?)
        {
        if(id!=null)
        {
                    Student student = db.Students.Where(m => m.StudentID == id).FirstOrDefault();
                    return PartialView("_StudentData", student);
                }
                return PartialView("_StudentData");
            }            
        }

[HttpPost]
public ActionResult AddEditRecord(Student student, string cmd)
{
   if (ModelState.IsValid)
   {
      if (cmd == "Save")
      {
         try
         {
            Student student = db.Students.Where(m => m.StudentID == id).FirstOrDefault();
            if(student!=null)
            {
               db.Students.Add(student);
               db.SaveChanges();
               return RedirectToAction("Index");
            }
            else
            {
               ModelState.Error("", "Record already exists");
               return PartialView("_StudentData", student);
            }   
         }
         catch { }
      }
         else
         {
            try
             {
               Student stud = db.Students.Where(m => m.StudentID == student.StudentID).FirstOrDefault();
               if (stud != null)
               {
                  stud.Name = student.Name;
                  stud.Age = student.Age;
                  stud.State = student.State;
                  stud.Country = student.Country;
                  db.SaveChanges();
                  return RedirectToAction("Index");
               }
             }
             catch { }
         }
      }
     return PartialView("_StudentData", student);
}