如何在 ASP.NET Core MVC 中使用我的视图模型更新我的 3 个表（我已经有了 Create）
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【中文标题】如何在 ASP.NET Core MVC 中使用我的视图模型更新我的 3 个表（我已经有了 Create）【英文标题】：How can I update my 3 tables using my viewmodel in ASP.NET Core MVC (I already have the Create) 【发布时间】：2021-10-28 16:08:36 【问题描述】：首先，我有 Parent、Student 和 Current Year Student 表，一个学生需要一个家长，所以显然需要先添加，然后再添加。 我的问题是如何使用 ViewModel 更改 Edit/UpdateStudent Action Result 以编辑数据库中的数据。
这是我的视图模型：
public class StudentParentViewModel
//parent
public int ParentID get; set;
public string Title get; set;
public int Contact_Number get; set;
public Nullable<int> Alt_Contact_Number get; set;
public string Email_Address get; set;
public string Home_Address get; set;
public int ParentTypeID get; set;
public string Parent_Name get; set;
public string Parent_Middle_Name get; set;
public string Parent_Surame get; set;
public long PID_Number get; set;
//student
public int StudentID get; set;
public System.DateTime DoB get; set;
public string Gender get; set;
public bool Remember get; set;
public int Student_TypeID get; set;
public string Student_Name get; set;
public string Student_Middle_Name get; set;
public string Student_Lastname get; set;
public long SID_Number get; set;
//current year student
public int CurrentYearStudentID get; set;
public Nullable<int> GradeID get; set;
public Nullable<int> ClassID get; set;
public Nullable<int> YearID get; set;
这是我的创建，用户将上面提到的 3 个实体添加到数据库中的相关表中，所有这些都是一对一的视图。
这是我的创建操作方法
// GET: Students/Create
public ActionResult RegisterStudent()
ThorntreeDatabaseEntities db = new ThorntreeDatabaseEntities();
ViewBag.ParentTypeID = new SelectList(db.ParentTypes, "Parent_TypeID", "Parent_Type");
ViewBag.Student_TypeID = new SelectList(db.StudentTypes, "Student_TypeID", "Student_Type");
ViewBag.ClassID = new SelectList(db.Classes, "ClassID", "Class_Name");
ViewBag.GradeID = new SelectList(db.Grades, "GradeID", "Grade_Name");
ViewBag.YearID = new SelectList(db.Years, "YearID", "Year1");
return View();
// POST: Students/Create
// To protect from overposting attacks, enable the specific properties you want to bind to, for
// more details see https://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult RegisterStudent(StudentParentViewModel studentParentViewModel)
ThorntreeDatabaseEntities db = new ThorntreeDatabaseEntities();
List<Class> ClassList = db.Classes.ToList();
ViewBag.ClassID = new SelectList(ClassList, "ClassID", "Class_Name");
List<Grade> GradeList = db.Grades.ToList();
ViewBag.GradeID = new SelectList(GradeList, "GradeID", "Grade_Name");
List<Year> YearList = db.Years.ToList();
ViewBag.YearID = new SelectList(YearList, "YearID", "Year1");
List<StudentType> TypeList = db.StudentTypes.ToList();
ViewBag.Student_TypeID = new SelectList(TypeList, "Student_TypeID", "Student_Type");
List<ParentType> ParentList = db.ParentTypes.ToList();
ViewBag.ParentTypeID = new SelectList(db.ParentTypes, "Parent_TypeID", "Parent_Type");
//Parent
Parent parent = new Parent();
parent.Title = studentParentViewModel.Title;
parent.Parent_Name = studentParentViewModel.Parent_Name;
parent.Parent_Middle_Name = studentParentViewModel.Parent_Middle_Name;
parent.Parent_Surame = studentParentViewModel.Parent_Surame;
parent.Home_Address = studentParentViewModel.Home_Address;
parent.PID_Number = studentParentViewModel.PID_Number;
parent.Contact_Number = studentParentViewModel.Contact_Number;
parent.Alt_Contact_Number = studentParentViewModel.Alt_Contact_Number;
parent.Email_Address = studentParentViewModel.Email_Address;
parent.ParentTypeID = studentParentViewModel.ParentTypeID;
db.Parents.Add(parent);
db.SaveChanges();
int latestParentID = parent.ParentID;
Student student = new Student();
student.Student_Name = studentParentViewModel.Student_Name;
student.Student_Middle_Name = studentParentViewModel.Student_Middle_Name;
student.Student_Lastname = studentParentViewModel.Student_Lastname;
student.DoB = studentParentViewModel.DoB;
student.SID_Number = studentParentViewModel.SID_Number;
student.Gender = studentParentViewModel.Gender;
student.Student_TypeID = studentParentViewModel.Student_TypeID;
student.ParentID = latestParentID;
db.Students.Add(student);
db.SaveChanges();
int latestStudentId = student.StudentID;
CurrentYearStudent current = new CurrentYearStudent();
current.ClassID = studentParentViewModel.ClassID;
current.GradeID = studentParentViewModel.GradeID;
current.YearID = studentParentViewModel.YearID;
current.StudentID = latestStudentId;
db.CurrentYearStudents.Add(current);
db.SaveChanges();
if (ModelState.IsValid)
db.SaveChanges();
return RedirectToAction("ViewStudents");
return View(studentParentViewModel);
这是我有编辑按钮的地方，它在我的 ViewStudents.cshtml 上。它使用的是 CurrentYearStudents 模型，所以我无法访问 ParentID：
@model IEnumerable<Thorntree_Primary_School_INF_370_System.Models.CurrentYearStudent>
@
ViewBag.Title = "View Students";
<html>
<head>
<style>
input[type="text"]
position: center;
display: block;
margin: 0 auto;
input[type="file"]
position: center;
display: block;
margin: 0 auto;
button[type="submit"]
position: center;
display: block;
margin: 0 auto;
#tableHeadder
display: table-header-group;
</style>
</head>
<body>
<h2>Hello</h2>
<h3>World</h3>
<div class="container" style="outline:solid">
<button class="btn bg-primary" style="">Back</button>
<div @*style="text-align:center"*@>
<h1>View Students</h1>
@using (Html.BeginForm("ViewStudents", "Student", FormMethod.Get))
//the following are search options
<b> Search Option: </b>@Html.RadioButton("option", "FirstName") <label>Name</label> @Html.RadioButton("option", "Grade") <label>Grade</label>
@Html.RadioButton("option", "Class")<label>Class</label> @Html.RadioButton("option", "None") <label>None</label> @Html.TextBox("search") <input type="submit" name="submit" value="Search" />
<table class="table table-dark">
<thead id="tableHeadder">
<tr>
<th scope="col">First Name</th>
<th scope="col">Last Name</th>
<th scope="col">Grade</th>
<th scope="col">Class</th>
</tr>
</thead>
<tbody>
@foreach (var item in Model)
<tr>
<td>
@Html.DisplayFor(modelItem => item.Student.Student_Name)
</td>
<td>
@Html.DisplayFor(modelItem => item.Student.Student_Lastname)
</td>
<td>
@Html.DisplayFor(modelItem => item.Grade.Grade_Name)
</td>
<td>
@Html.DisplayFor(modelItem => item.Class.Class_Name)
</td>
<td>
@Html.ActionLink("Edit", "UpdateStudent", new id = item.StudentID ) |
@Html.ActionLink("Delete", "Delete", new id = item.CurrentYearStudentID )
</td>
</tr>
</tbody>
</table>
</div>
</div>
</body>
</html>
这就是我的 3 个表在 SQL Server 中的样子
我真的可以使用一些帮助，我已经解决这个问题 2 天了，但无济于事。
如果您想查看我的更新操作，您可能会问，但是它几乎与添加操作相同，只是注释掉了，我不知道如何继续前进...请帮助，我'我现在很茫然，我不经常寻求帮助。 （我就是这样的人：（）
编辑视图：
@model Thorntree_Primary_School_INF_370_System.Models.StudentParentViewModel
@
ViewBag.Title = "Update Student";
@*<html>
<head>
@using (Html.BeginForm())
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h4 style="color:white">Parent of Student</h4>
<h4 style="color:white">Parent of Student</h4>
<h4 style="color:white">Parent of Student</h4>
<h4 style="color:white">Parent of Student</h4>
<h4>Parent of Student</h4>
<hr />
@Html.ValidationSummary(true, "", new @class = "text-danger" )
<div class="form-group">
<label for="Title" class="control-label col-md-2">Title</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Title, new htmlAttributes = new @class = "form-control", @value = Model.Title )
@Html.ValidationMessageFor(model => model.Title, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Contact_Number" class="control-label col-md-2">Contact Number</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Contact_Number, new htmlAttributes = new @class = "form-control", @value = Model.Contact_Number )
@Html.ValidationMessageFor(model => model.Contact_Number, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Alt_Contact_Number" class="control-label col-md-2">Alternative Contact Number</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Alt_Contact_Number, new htmlAttributes = new @class = "form-control", @value = Model.Alt_Contact_Number )
@Html.ValidationMessageFor(model => model.Alt_Contact_Number, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Email_Address" class="control-label col-md-2">Email Address</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Email_Address, new htmlAttributes = new @class = "form-control", @value = Model.Email_Address )
@Html.ValidationMessageFor(model => model.Email_Address, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Home_Address" class="control-label col-md-2">Home Address</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Home_Address, new htmlAttributes = new @class = "form-control", @value = Model.Home_Address )
@Html.ValidationMessageFor(model => model.Home_Address, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="ParentTypeID" class="control-label col-md-2">Parent Type</label>
<div class="col-md-10">
@Html.DropDownList("ParentTypeID", null, htmlAttributes: new @class = "form-control", @value = Model.ParentTypeID )
@Html.ValidationMessageFor(model => model.ParentTypeID, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Parent_Name" class="control-label col-md-2">Parent Name</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Parent_Name, new htmlAttributes = new @class = "form-control", @value = Model.Parent_Name )
@Html.ValidationMessageFor(model => model.Parent_Name, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Parent_Middle_Name" class="control-label col-md-2">Parent Middle Name</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Parent_Middle_Name, new htmlAttributes = new @class = "form-control", @value = Model.Parent_Middle_Name )
@Html.ValidationMessageFor(model => model.Parent_Middle_Name, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Parent_Surame" class="control-label col-md-2">Parent Surname</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Parent_Surame, new htmlAttributes = new @class = "form-control", @value = Model.Parent_Surame )
@Html.ValidationMessageFor(model => model.Parent_Surame, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="PID_Number" class="control-label col-md-2">Parent ID Number</label>
<div class="col-md-10">
@Html.EditorFor(model => model.PID_Number, new htmlAttributes = new @class = "form-control", @value = Model.PID_Number )
@Html.ValidationMessageFor(model => model.PID_Number, "", new @class = "text-danger" )
</div>
</div>
<div class="form-horizontal">
<h4>Student</h4>
<hr />
@Html.ValidationSummary(true, "", new @class = "text-danger" )
<div class="form-group">
<label for="DoB" class="control-label col-md-2">Date of Birth</label>
<div class="col-md-10">
@Html.EditorFor(model => model.DoB, new htmlAttributes = new @class = "form-control", @value = Model.DoB )
@Html.ValidationMessageFor(model => model.DoB, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="DoB" class="control-label col-md-2">Gender</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Gender, new htmlAttributes = new @class = "form-control", @value = Model.Gender )
@Html.ValidationMessageFor(model => model.Gender, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Student_TypeID" class="control-label col-md-2">Student Type</label>
<div class="col-md-10">
@Html.DropDownList("Student_TypeID", null, htmlAttributes: new @class = "form-control", @value = Model.Student_TypeID )
@Html.ValidationMessageFor(model => model.Student_TypeID, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Student_Name" class="control-label col-md-2">Student Name</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Student_Name, new htmlAttributes = new @class = "form-control", @value = Model.Student_Name )
@Html.ValidationMessageFor(model => model.Student_Name, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Student_Middle_Name" class="control-label col-md-2">Student Middle Name</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Student_Middle_Name, new htmlAttributes = new @class = "form-control", @value = Model.Student_Middle_Name )
@Html.ValidationMessageFor(model => model.Student_Middle_Name, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Student_Lastname" class="control-label col-md-2">Student Surname</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Student_Lastname, new htmlAttributes = new @class = "form-control", @value = Model.Student_Lastname )
@Html.ValidationMessageFor(model => model.Student_Lastname, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="SID_Number" class="control-label col-md-2">Student ID Number</label>
<div class="col-md-10">
@Html.EditorFor(model => model.SID_Number, new htmlAttributes = new @class = "form-control", @value = Model.SID_Number )
@Html.ValidationMessageFor(model => model.SID_Number, "", new @class = "text-danger" )
</div>
</div>
<div class="form-horizontal">
<h4>Register</h4>
<hr />
@Html.ValidationSummary(true, "", new @class = "text-danger" )
</div>
<div class="form-group">
<label for="GradeID" class="control-label col-md-2">Enrollment for Grade</label>
<div class="col-md-10">
@Html.DropDownList("GradeID", null, htmlAttributes: new @class = "form-control", @value = Model.GradeID )
@Html.ValidationMessageFor(model => model.GradeID, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="ClassID" class="control-label col-md-2">Enrollment for Class</label>
<div class="col-md-10">
@Html.DropDownList("ClassID", null, htmlAttributes: new @class = "form-control", @value = Model.ClassID )
@Html.ValidationMessageFor(model => model.ClassID, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="YearID" class="control-label col-md-2">Enrollment for Class</label>
<div class="col-md-10">
@Html.DropDownList("YearID", null, htmlAttributes: new @class = "form-control", @value = Model.YearID )
@Html.ValidationMessageFor(model => model.YearID, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</div>
</div>
</div>
<div>
<button>@Html.ActionLink("Back to List", "ViewStudents")</button>
</div>
这是我当前的更新操作结果（是的，可能非常错误，但确实可以编辑 StudentID）
public ActionResult UpdateStudent(int? id)
if (id == null)
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
ThorntreeDatabaseEntities db = new ThorntreeDatabaseEntities();
List<Class> ClassList = db.Classes.ToList();
ViewBag.ClassID = new SelectList(ClassList, "ClassID", "Class_Name");
List<Grade> GradeList = db.Grades.ToList();
ViewBag.GradeID = new SelectList(GradeList, "GradeID", "Grade_Name");
List<Year> YearList = db.Years.ToList();
ViewBag.YearID = new SelectList(YearList, "YearID", "Year1");
List<StudentType> TypeList = db.StudentTypes.ToList();
ViewBag.Student_TypeID = new SelectList(TypeList, "Student_TypeID", "Student_Type");
List<ParentType> ParentList = db.ParentTypes.ToList();
ViewBag.ParentTypeID = new SelectList(db.ParentTypes, "Parent_TypeID", "Parent_Type");
StudentParentViewModel viewModel = new StudentParentViewModel();
Student student = db.Students.Find(id);
Parent parent = db.Parents.Find(student.ParentID);
db.Students.Where(x => x.StudentID == parent.ParentID);
viewModel.Title = parent.Title;
viewModel.Parent_Name = parent.Parent_Name;
viewModel.Parent_Middle_Name = parent.Parent_Middle_Name;
viewModel.Parent_Surame = parent.Parent_Surame;
viewModel.Home_Address = parent.Home_Address;
viewModel.PID_Number = parent.PID_Number;
viewModel.Contact_Number = parent.Contact_Number;
viewModel.Alt_Contact_Number = parent.Alt_Contact_Number;
viewModel.Email_Address = parent.Email_Address;
viewModel.ParentTypeID = parent.ParentTypeID;
viewModel.ParentID = parent.ParentID;
int latestParentID = parent.ParentID;
viewModel.StudentID = student.StudentID;
viewModel.Student_Name = student.Student_Name;
viewModel.Student_Middle_Name = student.Student_Middle_Name;
viewModel.Student_Lastname = student.Student_Lastname;
viewModel.DoB = student.DoB;
viewModel.SID_Number = student.SID_Number;
viewModel.Gender = student.Gender;
viewModel.Student_TypeID = student.Student_TypeID;
student.ParentID = latestParentID;
int latestStudentId = student.StudentID;
db.Students.Where(x => x.StudentID == parent.ParentID);
viewModel.Title = parent.Parent_Name;
viewModel.Parent_Name = parent.Parent_Name;
viewModel.Parent_Middle_Name = parent.Parent_Middle_Name;
viewModel.Parent_Surame = parent.Parent_Surame;
viewModel.Home_Address = parent.Home_Address;
viewModel.PID_Number = parent.PID_Number;
viewModel.Contact_Number = parent.Contact_Number;
viewModel.Alt_Contact_Number = parent.Alt_Contact_Number;
viewModel.Email_Address = parent.Email_Address;
viewModel.ParentTypeID = parent.ParentTypeID;
CurrentYearStudent current = new CurrentYearStudent();
viewModel.ClassID = current.ClassID;
viewModel.GradeID = current.GradeID;
viewModel.YearID = current.YearID;
viewModel.StudentID = latestStudentId;
ViewBag.ParentTypeID = new SelectList(db.ParentTypes, "Parent_TypeID", "Parent_Type");
ViewBag.Student_TypeID = new SelectList(db.StudentTypes, "Student_TypeID", "Student_Type");
ViewBag.ClassID = new SelectList(db.Classes, "ClassID", "Class_Name");
ViewBag.GradeID = new SelectList(db.Grades, "GradeID", "Grade_Name");
ViewBag.YearID = new SelectList(db.Years, "YearID", "Year1");
return View(viewModel);
// POST: Students/Update/5
// To protect from overposting attacks, enable the specific properties you want to bind to, for
// more details see https://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult UpdateStudent(StudentParentViewModel viewModel)
ThorntreeDatabaseEntities db = new ThorntreeDatabaseEntities();
List<Class> ClassList = db.Classes.ToList();
ViewBag.ClassID = new SelectList(ClassList, "ClassID", "Class_Name");
List<Grade> GradeList = db.Grades.ToList();
ViewBag.GradeID = new SelectList(GradeList, "GradeID", "Grade_Name");
List<Year> YearList = db.Years.ToList();
ViewBag.YearID = new SelectList(YearList, "YearID", "Year1");
List<StudentType> TypeList = db.StudentTypes.ToList();
ViewBag.Student_TypeID = new SelectList(TypeList, "Student_TypeID", "Student_Type");
List<ParentType> ParentList = db.ParentTypes.ToList();
ViewBag.ParentTypeID = new SelectList(db.ParentTypes, "Parent_TypeID", "Parent_Type");
Parent parent = new Parent();
parent.Title = viewModel.Title;
parent.Parent_Name = viewModel.Parent_Name;
parent.Parent_Middle_Name = viewModel.Parent_Middle_Name;
parent.Parent_Surame = viewModel.Parent_Surame;
parent.Home_Address = viewModel.Home_Address;
parent.PID_Number = viewModel.PID_Number;
parent.Contact_Number = viewModel.Contact_Number;
parent.Alt_Contact_Number = viewModel.Alt_Contact_Number;
parent.Email_Address = viewModel.Email_Address;
parent.ParentTypeID = viewModel.ParentTypeID;
int latestParentID = parent.ParentID;
Student student = new Student();
student.Student_Name = viewModel.Student_Name;
student.Student_Middle_Name = viewModel.Student_Middle_Name;
student.Student_Lastname = viewModel.Student_Lastname;
student.DoB = viewModel.DoB;
student.SID_Number = viewModel.SID_Number;
student.Gender = viewModel.Gender;
student.Student_TypeID = viewModel.Student_TypeID;
student.ParentID = latestParentID;
int latestStudentId = student.StudentID;
ViewBag.ParentID = new SelectList(db.Parents, "ParentID", "Title", student.ParentID);
CurrentYearStudent current = new CurrentYearStudent();
current.ClassID = viewModel.ClassID;
current.GradeID = viewModel.GradeID;
current.YearID = viewModel.YearID;
current.StudentID = latestStudentId;
db.CurrentYearStudents.Add(current);
ViewBag.Student_TypeID = new SelectList(db.StudentTypes, "Student_TypeID", "Student_Type", student.Student_TypeID);
if (ModelState.IsValid)
db.Entry(student).State = EntityState.Modified;
db.Entry(parent).State = EntityState.Modified;
db.Entry(current).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("ViewStudents");
return View(viewModel);
【问题讨论】：
我想知道您的期望吗？你到底想从你的视图模型更新到 3 个表中的什么？你是说这个StudentParentViewModel viewModel？如果是的话，它的观点在哪里？
添加必要的信息，以便您的问题可以轻松重现。这个问题很难重现，因为它有许多未包含在内的依赖项。尝试添加示例以加载您的 RegisterStudent 视图和 edit 上下文，以便更轻松地向您展示您陷入困境的后续步骤。
@MdFaridUddinKiron 所以我正在尝试更新学生表中的所有详细信息，然后是学生所属家长的详细信息以及学生所在的年级、班级和年级，只有CurrentYearStudent 表显示在我的视图中。我添加了编辑页面的视图，他们在其中更改了详细信息。
如果它可以重现，那么指出你的问题可能会更容易
@MdFaridUddinKiron 那么有人需要什么来重现它呢？我的 CreateStudent 视图？我当前的非工作更新操作结果？
【参考方案1】：
让我们从下面的评论开始吧..
“但是我不知道为什么我的 Http Post: 不起作用”
因为你的这个代码@using (Html.BeginForm()) 而应该是@using (Html.BeginForm("ActionName", "controllerName"))
如何使用我的视图模型更新我的 3 个表：
请按照以下步骤操作
首先加载列表的学生模型：
public class Student
[Key]
public int StudentID get; set;
public string DoB get; set;
public string Gender get; set;
public bool Remember get; set;
public string Student_Name get; set;
public string Student_Middle_Name get; set;
public string Student_Lastname get; set;
public long SID_Number get; set;
[ForeignKey("Parent")]
public int ParentID get; set;
[ForeignKey("StudentType")]
public int StudentTypeID get; set;
[ForeignKey("Grades")]
public int GradeID get; set;
[ForeignKey("Year")]
public int YearID get; set;
[ForeignKey("ClassType")]
public int ClassTypeID get; set;
public virtual StudentType StudentType get; set;
public virtual Parent Parent get; set;
public virtual Grades Grades get; set;
public virtual Year Year get; set;
public virtual ClassType ClassType get; set;
加载学生列表的控制器：
我不确定您使用哪种方法绑定数据database first 或code first。我正在绑定数据库中的数据，如下所示：
public IActionResult GetAllStudents()
var obj = _context.Students.Include(st => st.StudentType).Include(pt => pt.Parent).Include(y => y.Year).Include(ct => ct.ClassType).ToList();
return View(obj);
查看学生名单：
@model IEnumerable<MVCApps.Models.Student>
<p>
<a asp-action="Create">Create New</a>
</p>
<table class="table table table-bordered">
<thead>
<tr>
<th>
@Html.DisplayNameFor(model => model.StudentID)
</th>
<th>
@Html.DisplayNameFor(model => model.DoB)
</th>
<th>
@Html.DisplayNameFor(model => model.Gender)
</th>
<th>
@Html.DisplayNameFor(model => model.Remember)
</th>
<th>
@Html.DisplayNameFor(model => model.Student_Name)
</th>
<th>
@Html.DisplayNameFor(model => model.Student_Middle_Name)
</th>
<th>
@Html.DisplayNameFor(model => model.Student_Lastname)
</th>
<th>
@Html.DisplayNameFor(model => model.SID_Number)
</th>
<th>
@Html.DisplayNameFor(model => model.Parent.Parent_Name)
</th>
<th>
@Html.DisplayNameFor(model => model.StudentType)
</th>
<th>
@Html.DisplayNameFor(model => model.GradeID)
</th>
<th>
@Html.DisplayNameFor(model => model.YearID)
</th>
<th>
@Html.DisplayNameFor(model => model.ClassTypeID)
</th>
<th></th>
</tr>
</thead>
<tbody>
@foreach (var item in Model)
<tr>
<td>
@Html.DisplayFor(modelItem => item.StudentID)
</td>
<td>
@Html.DisplayFor(modelItem => item.DoB)
</td>
<td>
@Html.DisplayFor(modelItem => item.Gender)
</td>
<td>
@Html.DisplayFor(modelItem => item.Remember)
</td>
<td>
@Html.DisplayFor(modelItem => item.Student_Name)
</td>
<td>
@Html.DisplayFor(modelItem => item.Student_Middle_Name)
</td>
<td>
@Html.DisplayFor(modelItem => item.Student_Lastname)
</td>
<td>
@Html.DisplayFor(modelItem => item.SID_Number)
</td>
<td>
@Html.DisplayFor(modelItem => item.Parent.Parent_Name)
</td>
<td>
@Html.DisplayFor(modelItem => item.StudentType.StudentTypeName)
</td>
<td>
@Html.DisplayFor(modelItem => item.Grades.GradeName)
</td>
<td>
@Html.DisplayFor(modelItem => item.Year.YearName)
</td>
<td>
@Html.DisplayFor(modelItem => item.ClassType.ClassTypeName)
</td>
<td>
@Html.ActionLink("Edit", "UpdateStudentById", new id = item.StudentID , new @class = "btn btn-primary" )
</td>
<td>
@Html.ActionLink("Details", "Details", new /* id=item.PrimaryKey */ , new @class = "btn btn-info" )
</td>
<td>
@Html.ActionLink("Delete", "Delete", new /* id=item.PrimaryKey */ , new @class = "btn btn-danger" )
</td>
</tr>
</tbody>
</table>
注意：为了加载这个视图，我正在使用你的
student域类。
输出：
更新操作：
当您单击编辑按钮时，它应该使用viewmodel 类型加载您的视图。
所以我们将在哪里使用你的StudentParentViewModel
查看模型：
public class StudentParentViewModel
//parent
public int ParentID get; set;
public string Title get; set;
public int Contact_Number get; set;
public Nullable<int> Alt_Contact_Number get; set;
public string Email_Address get; set;
public string Home_Address get; set;
public int ParentTypeID get; set;
public string Parent_Name get; set;
public string Parent_Middle_Name get; set;
public string Parent_Surame get; set;
public long PID_Number get; set;
//student
public int StudentID get; set;
public DateTime DoB get; set;
public string Gender get; set;
public bool Remember get; set;
public int StudentTypeID get; set;
public string Student_Name get; set;
public string Student_Middle_Name get; set;
public string Student_Lastname get; set;
public long SID_Number get; set;
//current year student
public int CurrentYearStudentID get; set;
public Nullable<int> GradeID get; set;
public Nullable<int> ClassTypeID get; set;
public Nullable<int> YearID get; set;
更新控制器：
当您单击edit 按钮时，它将使用特定的id 击中控制器。所以这里我们通过id获取详细信息后绑定ViewModel，返回加载视图update view
public ActionResult UpdateStudentById(int? id)
//Get student by ID
var studentObject = _context.Students.Include(st => st.StudentType).Include(pt => pt.Parent).Where(sid => sid.StudentID == id).FirstOrDefault();
//Bind Dropdown
List<StudentType> studentType = _context.studentTypes.ToList();
ViewBag.StudentTypeID = new SelectList(studentType, "StudentTypeID", "StudentTypeName");
//Bind ParentType Dropdown
List<ParentType> parentTypeList = _context.ParentTypes.ToList();
ViewBag.ParentTypeID = new SelectList(parentTypeList, "ParentTypeID", "ParentTypeName");
//class type
List<ClassType> classType = _context.classTypes.ToList();
ViewBag.ClassTypeID = new SelectList(classType, "ClassTypeID", "ClassTypeName");
//grade
List<Grades> grades = _context.Grades.ToList();
ViewBag.GradeID = new SelectList(grades, "GradeID", "GradeName");
//class type
List<Year> years = _context.Years.ToList();
ViewBag.YearID = new SelectList(years, "YearID", "YearName");
//Bind to View Model
StudentParentViewModel viewModel = new StudentParentViewModel();
//Student student = _context.Students.Find(id);
// Parent parent = _context.parents.Find(parent.ParentID);
//db.Students.Where(x => x.StudentID == parent.ParentID);
viewModel.Title = studentObject.Parent.Title;
viewModel.Parent_Name = studentObject.Parent.Parent_Name;
viewModel.Parent_Middle_Name = studentObject.Parent.Parent_Middle_Name;
viewModel.Parent_Surame = studentObject.Parent.Parent_Surame;
viewModel.Home_Address = studentObject.Parent.Home_Address;
viewModel.PID_Number = studentObject.Parent.PID_Number;
viewModel.Contact_Number = studentObject.Parent.Contact_Number;
viewModel.Alt_Contact_Number = studentObject.Parent.Alt_Contact_Number;
viewModel.Email_Address = studentObject.Parent.Email_Address;
viewModel.ParentTypeID = studentObject.Parent.ParentTypeID;
viewModel.ParentID = studentObject.Parent.ParentID;
int latestParentID = studentObject.Parent.ParentID;
viewModel.StudentID = studentObject.StudentID;
viewModel.Student_Name = studentObject.Student_Name;
viewModel.Student_Middle_Name = studentObject.Student_Middle_Name;
viewModel.Student_Lastname = studentObject.Student_Lastname;
viewModel.DoB = Convert.ToDateTime(studentObject.DoB);
viewModel.SID_Number = studentObject.SID_Number;
viewModel.Gender = studentObject.Gender;
viewModel.StudentTypeID = studentObject.StudentTypeID;
studentObject.ParentID = latestParentID;
int latestStudentId = studentObject.StudentID;
return View(viewModel);
更新视图：
@model MVCApps.Models.StudentParentViewModel
@using (Html.BeginForm("UpdateStudent", "Student"))
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h4 style="color:white">Parent of Student</h4>
<h4 style="color:white">Parent of Student</h4>
<h4 style="color:white">Parent of Student</h4>
<h4 style="color:white">Parent of Student</h4>
<div class="form-horizontal">
<h4>Student</h4>
<hr />
@Html.ValidationSummary(true, "", new @class = "text-danger" )
<div class="form-group" hidden>
<label for="DoB" class="control-label col-md-2">StudentID</label>
<div class="col-md-10">
@Html.EditorFor(model => model.StudentID, new htmlAttributes = new @class = "form-control", @value = Model.StudentID )
@Html.ValidationMessageFor(model => model.StudentID, "", new @class = "text-danger" )
</div>
</div>
@Html.ValidationSummary(true, "", new @class = "text-danger" )
<div class="form-group">
<label for="DoB" class="control-label col-md-2">Date of Birth</label>
<div class="col-md-10">
@Html.EditorFor(model => model.DoB, new htmlAttributes = new @class = "form-control", @value = Model.DoB )
@Html.ValidationMessageFor(model => model.DoB, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="DoB" class="control-label col-md-2">Gender</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Gender, new htmlAttributes = new @class = "form-control", @value = Model.Gender )
@Html.ValidationMessageFor(model => model.Gender, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Student_TypeID" class="control-label col-md-2">Student Type</label>
<div class="col-md-10">
@Html.DropDownList("StudentTypeID", null, htmlAttributes: new @class = "form-control", @value = Model.StudentTypeID )
@Html.ValidationMessageFor(model => model.StudentTypeID, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Student_Name" class="control-label col-md-2">Student Name</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Student_Name, new htmlAttributes = new @class = "form-control", @value = Model.Student_Name )
@Html.ValidationMessageFor(model => model.Student_Name, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Student_Middle_Name" class="control-label col-md-2">Student Middle Name</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Student_Middle_Name, new htmlAttributes = new @class = "form-control", @value = Model.Student_Middle_Name )
@Html.ValidationMessageFor(model => model.Student_Middle_Name, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Student_Lastname" class="control-label col-md-2">Student Surname</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Student_Lastname, new htmlAttributes = new @class = "form-control", @value = Model.Student_Lastname )
@Html.ValidationMessageFor(model => model.Student_Lastname, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="SID_Number" class="control-label col-md-2">Student ID Number</label>
<div class="col-md-10">
@Html.EditorFor(model => model.SID_Number, new htmlAttributes = new @class = "form-control", @value = Model.SID_Number )
@Html.ValidationMessageFor(model => model.SID_Number, "", new @class = "text-danger" )
</div>
</div>
<h4>Parent of Student</h4>
<hr />
@Html.ValidationSummary(true, "", new @class = "text-danger" )
<div class="form-group" hidden>
<label for="Title" class="control-label col-md-2">StudentID</label>
<div class="col-md-10">
@Html.EditorFor(model => model.ParentID, new htmlAttributes = new @class = "form-control", @value = Model.ParentID )
@Html.ValidationMessageFor(model => model.ParentID, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Title" class="control-label col-md-2">Title</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Title, new htmlAttributes = new @class = "form-control", @value = Model.Title )
@Html.ValidationMessageFor(model => model.Title, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Contact_Number" class="control-label col-md-2">Contact Number</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Contact_Number, new htmlAttributes = new @class = "form-control", @value = Model.Contact_Number )
@Html.ValidationMessageFor(model => model.Contact_Number, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Alt_Contact_Number" class="control-label col-md-2">Alternative Contact Number</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Alt_Contact_Number, new htmlAttributes = new @class = "form-control", @value = Model.Alt_Contact_Number )
@Html.ValidationMessageFor(model => model.Alt_Contact_Number, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Email_Address" class="control-label col-md-2">Email Address</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Email_Address, new htmlAttributes = new @class = "form-control", @value = Model.Email_Address )
@Html.ValidationMessageFor(model => model.Email_Address, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Home_Address" class="control-label col-md-2">Home Address</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Home_Address, new htmlAttributes = new @class = "form-control", @value = Model.Home_Address )
@Html.ValidationMessageFor(model => model.Home_Address, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="ParentTypeID" class="control-label col-md-2">Parent Type</label>
<div class="col-md-10">
@Html.DropDownList("ParentTypeID", null, htmlAttributes: new @class = "form-control", @value = Model.ParentTypeID )
@Html.ValidationMessageFor(model => model.ParentTypeID, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Parent_Name" class="control-label col-md-2">Parent Name</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Parent_Name, new htmlAttributes = new @class = "form-control", @value = Model.Parent_Name )
@Html.ValidationMessageFor(model => model.Parent_Name, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Parent_Middle_Name" class="control-label col-md-2">Parent Middle Name</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Parent_Middle_Name, new htmlAttributes = new @class = "form-control", @value = Model.Parent_Middle_Name )
@Html.ValidationMessageFor(model => model.Parent_Middle_Name, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="Parent_Surame" class="control-label col-md-2">Parent Surname</label>
<div class="col-md-10">
@Html.EditorFor(model => model.Parent_Surame, new htmlAttributes = new @class = "form-control", @value = Model.Parent_Surame )
@Html.ValidationMessageFor(model => model.Parent_Surame, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="PID_Number" class="control-label col-md-2">Parent ID Number</label>
<div class="col-md-10">
@Html.EditorFor(model => model.PID_Number, new htmlAttributes = new @class = "form-control", @value = Model.PID_Number )
@Html.ValidationMessageFor(model => model.PID_Number, "", new @class = "text-danger" )
</div>
</div>
<div class="form-horizontal">
<h4>Register</h4>
<hr />
@Html.ValidationSummary(true, "", new @class = "text-danger" )
</div>
<div class="form-group">
<label for="GradeID" class="control-label col-md-2">Enrollment for Grade</label>
<div class="col-md-10">
@Html.DropDownList("GradeID", null, htmlAttributes: new @class = "form-control", @value = Model.GradeID )
@Html.ValidationMessageFor(model => model.GradeID, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="ClassID" class="control-label col-md-2">Enrollment for Class</label>
<div class="col-md-10">
@Html.DropDownList("ClassTypeID", null, htmlAttributes: new @class = "form-control", @value = Model.ClassTypeID )
@Html.ValidationMessageFor(model => model.ClassTypeID, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<label for="YearID" class="control-label col-md-2">Enrollment for Class</label>
<div class="col-md-10">
@Html.DropDownList("YearID", null, htmlAttributes: new @class = "form-control", @value = Model.YearID )
@Html.ValidationMessageFor(model => model.YearID, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Update" class="btn btn-success" />
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
@Html.ActionLink("List", "GetAllStudents", new /* id=item.PrimaryKey */ , new @class = "btn btn-info" )
</div>
</div>
</div>
</div>
更新视图的输出：
更新控制器：
当更新视图被加载时，在必要的更新后，我们将点击更新按钮，它将更新的数据发送到UpdateStudent控制器，我们的StudentParentViewModel如下所示：
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult UpdateStudent(StudentParentViewModel viewModel)
//If either of this is empty then add
if (viewModel.StudentID == 0 && viewModel.ParentID == 0)
//Add Or Create
//Bind Student
var student = new Student();
student.Student_Name = viewModel.Student_Name;
student.Student_Middle_Name = viewModel.Student_Middle_Name;
student.Student_Lastname = viewModel.Student_Lastname;
student.Gender = viewModel.Gender;
student.StudentTypeID = viewModel.StudentTypeID;
student.ParentID = viewModel.ParentID;
student.DoB = viewModel.DoB.ToString();
student.GradeID = viewModel.GradeID??0;
student.ClassTypeID = viewModel.ClassTypeID??0;
student.YearID = viewModel.YearID??0;
student.ClassTypeID = viewModel.ClassTypeID??0;
_context.Students.Add(student);
_context.SaveChanges();
//Bind Parent
Parent parent = new Parent();
parent.Title = viewModel.Title;
parent.Parent_Name = viewModel.Parent_Name;
parent.Parent_Middle_Name = viewModel.Parent_Middle_Name;
parent.Parent_Surame = viewModel.Parent_Surame;
parent.Home_Address = viewModel.Home_Address;
parent.PID_Number = viewModel.PID_Number;
parent.Contact_Number = viewModel.Contact_Number;
parent.Alt_Contact_Number = viewModel.Alt_Contact_Number;
parent.Email_Address = viewModel.Email_Address;
parent.ParentTypeID = viewModel.ParentTypeID;
_context.parents.Add(parent);
_context.SaveChanges();
else
var findStudent = _context.Students.Find(viewModel.StudentID);
//Bind to student table
Student objStudent = new Student();
findStudent.Student_Name = viewModel.Student_Name;
findStudent.Student_Middle_Name = viewModel.Student_Middle_Name;
findStudent.Student_Lastname = viewModel.Student_Lastname;
findStudent.DoB = viewModel.DoB.ToString();
findStudent.SID_Number = viewModel.SID_Number;
findStudent.Gender = viewModel.Gender;
findStudent.StudentTypeID = viewModel.StudentTypeID;
findStudent.ParentID = viewModel.ParentID;
findStudent.ClassTypeID = viewModel.ClassTypeID??0;
findStudent.GradeID =(int) viewModel.GradeID;
findStudent.ParentID = viewModel.ParentID;
//Bind the parent table
var findParent = _context.parents.Find(viewModel.ParentID);
Parent objParent = new Parent();
findParent.Title = viewModel.Title;
findParent.Parent_Name = viewModel.Parent_Name;
findParent.Parent_Middle_Name = viewModel.Parent_Middle_Name;
findParent.Parent_Surame = viewModel.Parent_Surame;
findParent.Home_Address = viewModel.Home_Address;
findParent.PID_Number = viewModel.PID_Number;
findParent.Contact_Number = viewModel.Contact_Number;
findParent.Alt_Contact_Number = viewModel.Alt_Contact_Number;
findParent.Email_Address = viewModel.Email_Address;
findParent.ParentTypeID = viewModel.ParentTypeID;
_context.SaveChanges();
//Bind Dropdown
List<StudentType> studentType = _context.studentTypes.ToList();
ViewBag.StudentTypeID = new SelectList(studentType, "StudentTypeID", "StudentTypeName");
//Bind ParentType Dropdown
List<ParentType> parentTypeList = _context.ParentTypes.ToList();
ViewBag.ParentTypeID = new SelectList(parentTypeList, "ParentTypeID", "ParentTypeName");
//class type
List<ClassType> classType = _context.classTypes.ToList();
ViewBag.ClassTypeID = new SelectList(classType, "ClassTypeID", "ClassTypeName");
//grade
List<Grades> grades = _context.Grades.ToList();
ViewBag.GradeID = new SelectList(grades, "GradeID", "GradeName");
//class type
List<Year> years = _context.Years.ToList();
ViewBag.YearID = new SelectList(years, "YearID", "YearName");
// return Redirect()
return RedirectToAction("GetAllStudents");
注意： 像Student 和Parent 表一样，您可以将视图模型数据绑定到Nth 表编号，就像我上面展示的方式一样。最后将更新页面重定向到列表页面。
最终输出：
注意： 我发现您的代码中有一些不一致之处，您可以改进，例如如果您将类属性写为
Parent_Name那么 在任何地方都遵循under score约定。如果camel caseparentName然后camel case无处不在，就像明智的pascal caseParentTypeID然后遵循减少代码异味和 使代码更具可读性。
希望以上步骤能帮助您解决问题。
【讨论】：
我会永远记住你的名字作为我的救世主，我会注意命名约定。打心眼里谢谢谢谢谢谢！ 另外一点，我想你在哪里说_context.Students.Add(student); 和 _context.parents.Add(parent); 所以对于这两行，我认为它导致数据添加一个条目，其中包含与更新相对应的新更新它。您可能知道问题所在吗？ @Md Farid Uddin Kiron
一开始你可以注意到在更新方法中，我检查了学生和父母的id，这意味着当我们创建新的学生和父母时，当时没有id，所以当有id时表示我们正在更新，当没有 id 时表示需要添加。只需自己检查逻辑，然后让我知道您的反馈。
我尝试使用更新方法来添加和更新请求。你可以把它分开，这样就不会有挑战了。
您可以省略if 部分并删除else 并将代码保留在仅用于更新的else 部分中。希望你明白我的意思。以上是关于如何在 ASP.NET Core MVC 中使用我的视图模型更新我的 3 个表（我已经有了 Create）的主要内容，如果未能解决你的问题，请参考以下文章
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