使用MVC 5添加到表中，并在删除记录后重置Id

我有两个问题:

首先，我写了一个代码来添加医生到数据库中，在开始的代码工作得很好，但在添加验证后，医生信息没有添加到表中。当我按下添加按钮时，URL转到:/Doctors/Save为什么数据没有保存在数据库中?为什么在我按下添加按钮后，程序没有将我重定向到添加视图?

在控制器中，Add()动作用于包含添加表单的添加视图。Save()动作是针对Add视图内的Html.BeginForm("Save","Doctors") .

下面是我的代码:

public ActionResult Add()
    {  return View();
    }
    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Save(Doctor doctor)
    {
        if (!ModelState.IsValid)
        {
            var viewModel = new DoctorViewModel
            {
                Doctor = doctor
            };
            return View("Add", viewModel);
        }
      if(doctor.Id == 0) {
      _context.Doctors.Add(doctor);
      _context.SaveChanges();
      return Redirect("Add");
        }
      else
      {
          var doctorInDb = _context.Doctors.Single(c => c.Id == doctor.Id);
          doctorInDb.Name = doctor.Name;
          doctorInDb.Symbol = doctor.Symbol;
          doctorInDb.Office = doctor.Office;
          doctorInDb.Phone = doctor.Phone;
          doctorInDb.Email = doctor.Email;
          _context.SaveChanges();
          return Redirect("Add");
        }
       } 

添加视图:

@model Project.ViewModels.DoctorViewModel
@{
    ViewBag.Title = "Add";
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Adding a Doctor</h2>
@using (Html.BeginForm("Save", "Doctors"))
{
    <div class="form-group">
        @Html.LabelFor(m => m.Doctor.Name)
        @Html.TextBoxFor(m => m.Doctor.Name , new { @class = "form-control"})
        @Html.ValidationMessageFor(m => m.Doctor.Name)
    </div>
    <div class="form-group">
        @Html.LabelFor(m => m.Doctor.Symbol)
        @Html.TextBoxFor(m => m.Doctor.Symbol, new { @class = "form-control" })
        @Html.ValidationMessageFor(m => m.Doctor.Symbol)
    </div>
    <div class="form-group">
        @Html.LabelFor(m => m.Doctor.Phone)
        @Html.TextBoxFor(m => m.Doctor.Phone, new { @class = "form-control" })
        @Html.ValidationMessageFor(m => m.Doctor.Phone)
    </div>

    <div class="form-group">
        @Html.LabelFor(m => m.Doctor.Office)
        @Html.TextBoxFor(m => m.Doctor.Office, new { @class = "form-control" })
    </div>

    <div class="form-group">
        @Html.LabelFor(m => m.Doctor.Email)
        @Html.TextBoxFor(m => m.Doctor.Email, new { @class = "form-control" })
    </div>
    @Html.HiddenFor(m => m.Doctor.Id)
    @Html.AntiForgeryToken()
    <button type="submit" class="btn btn-primary"> <h5> Add </h5> </button>     @Html.ActionLink("Go to doctors list", "DoctorList")
}
    @section scripts{
        @Scripts.Render("~/bundles/jqueryval")
        }

第二个问题:

我可以重置Id，从表中删除所有记录后，从控制器?

这是我的重置代码:

public ActionResult Reset()
    {
        _context.PSRs.RemoveRange(_context.PSRs);
        _context.SaveChanges();
        return Redirect("PSR");
    }

谢谢!

    if (!ModelState.IsValid)
    {
        var viewModel = new DoctorViewModel
        {
            Doctor = doctor
        };
        return View("Add", viewModel);
    }

var message = string.Join(" | ", ModelState.Values
    .SelectMany(v => v.Errors)
    .Select(e => e.ErrorMessage));