c# - 需要数据注释抛出错误而不是验证客户端

Question

我正在尝试使用“必填”数据注释，因此用户需要在客户端填写一个字段。尽管如果用户将该字段留空并提交表单，它会抛出错误，而不是告诉用户客户端“需要开始时间”。

错误:

我的数据注释:

[Required(ErrorMessage = "A start time is required")]
public string StartTime { get; set; }
[Required(ErrorMessage = "An end time is required")]
public string EndTime { get; set; }

我的表单的 Controller :

    [HttpGet]
    public ActionResult BookingForm(School model)
    {
        School school = db.Schools.First(m => m.RollNumber == 
        model.RollNumber);
        return View(school);
    }

    [HttpPost]
    [ActionName("BookingForm")]
    public ActionResult BookingFormPost(Booking model)
    {
        db.Bookings.Add(model);
        db.SaveChanges();
        return RedirectToAction("Index");
    }

查看:

<form asp-controller="School" asp-action="BookingForm" method="post">

<br />

<p>Please complete the following information</p>
<div>
    <label for="RollNumber">School Roll Number:</label>
    <br />
    <input asp-for="Booking.Rollnumber" id="txtRoll" name="RollNumber" 
value="@Model.RollNumber" />
</div>
<br />
<div>
    <label for="Date">Choose Camp Date:</label>
    <br />
    <input asp-for="Booking.Date" id="txtDate" name="Date" 
value="@Model.Date.Value.ToShortDateString()" />
</div>
<br />
<div>
    <label for="OfficialSchoolName">School Name:</label>
    <br />
    <input asp-for="Booking.OfficialSchoolName" id="txtOfficialSchoolName" 
name="OfficialSchoolName" value="@Model.OfficialSchoolName" />
</div>
<br />
<div>
    <label for="Address">School Address:</label>
    <br />
    <input asp-for="Booking.Address1" id="txtAddress1" name="Address1" 
value="@Model.Address1" />
    <br />
    <input asp-for="Booking.Address2" id="txtAddress2" name="Address2" 
value="@Model.Address2" />
    <br />
    <input asp-for="Booking.Address3" id="txtAddress3" name="Address3" 
value="@Model.Address3" />
    <br />
    <input asp-for="Booking.Address4" id="txtAddress4" name="Address4" 
value="@Model.Address4" />
</div>
<br />
<div>
    <label for="Times">Times Needed:</label>
    <br />
    <input asp-for="Booking.StartTime" id="txtStartTime" name="StartTime" 
value="Start Time e.g. 10:30" />
    <input asp-for="Booking.EndTime" id="txtEndTime" name="EndTime" 
value="End Time e.g. 16:00" />
</div>
<br />
<div>
    <label for="ClassGroups">Class Groups:</label>
    <br />
    <input asp-for="Booking.ClassGroups" id="txtClassGroups" 
name="ClassGroups" value="e.g. 4th class, 6th class, 1st year etc." />
</div>
<br />
<div>
    <label for="Topics">Topics to be covered:</label>
    <br />
    <input asp-for="Booking.Topics" id="txtTopics" name="Topics" value="" />
</div>
<br />
<div>
    <label for="TeacherName">Teacher Name:</label>
    <br />
    <input asp-for="Booking.TeacherName" id="txtTeacherName" 
name="TeacherName" />
</div>
<br />
<div>
    <label for="Email">Teacher Email:</label>
    <br />
    <input asp-for="Booking.Email" id="txtEmail" name="Email" />
</div>
<br />
<div>
    <label for="PhoneNumber">Teacher Contact Number:</label>
    <br />
    <input asp-for="Booking.PhoneNumber" " id="txtPhoneNumber" 
name="PhoneNumber" value="@Model.PhoneNumber" />
</div>
<br />
<div>
    <label for="Surveys">Would you like to take part in research surveys? 
</label>
    <br />
    <input asp-for="Booking.Surveys" id="Surveys" name="Surveys" 
type="checkbox" checked />
</div>
<br />
<input type="submit" value="Submit" class="submit" />
</form>

谁能告诉我为什么没有进行客户端验证？为什么我会收到错误消息？

干杯

编辑:

我尝试了以下 Controller 更改

    [HttpGet]
    public ActionResult BookingForm(School model)
    {
        School school = db.Schools.First(m => m.RollNumber == 
        model.RollNumber);
        return View(school);
    }

    [HttpPost]
    [ActionName("BookingForm")]
    public ActionResult BookingFormPost(Booking model)
    {
        if (ModelState.IsValid)
        {
            db.Bookings.Add(model);
            db.SaveChanges();
            return RedirectToAction("Index","Home");
        }

        return View(model);
    }

然后我在提交表单时收到以下浏览器消息:

“/”应用程序中的服务器错误。传递到字典中的模型项的类型为“CampBookingSys.Models.Booking”，但此字典需要一个类型为“CampBookingSys.Models.School”的模型项。

Answer 1

在您的 Controller 操作上接收模型及其属性上的数据注释，您应该有一些类似的东西

public IActionResult Get(Obj blah)
{
    if (ModelState.IsValid) 
    { 

       ...
       return View("WhateverPageIsAfterSuccess")
    }


    return RedirectToAction("IndexAction")
}