我是MVC的新手并且正在学习它。我创建了两个名为Employees和Course的表，并使用实体框架创建了上下文类（DB first）。我使用metadatatype为两个模型类添加了验证对象，并创建了viewmodel以在视图上创建Radiobutton列表。我在Httppost编辑时为viewmodel对象获取null。
ViewModel cs
public class EmployeeCourseViewModel
{
public Employee emp { get; set; }
public List<Course> empCourse { get; set; }
public int SelectDepartment { get; set; }
}
修改视图
@model WebApplication2.Models.EmployeeCourseViewModel
@using (Html.BeginForm("Edit", "Employee", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>Employee</h4>
<hr />
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
@Html.HiddenFor(model => model.emp.EmpId)
<div class="form-group">
@Html.LabelFor(model => model.emp.FirstName, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.emp.FirstName, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.emp.FirstName, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.emp.LastName, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.emp.LastName, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.emp.LastName, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.emp.Gender, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.emp.Gender, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.emp.Gender, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.emp.EmailAddress, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.emp.EmailAddress, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.emp.EmailAddress, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.emp.PersonalWebSite, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.emp.PersonalWebSite, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.emp.PersonalWebSite, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.emp.Photo, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@*@Html.EditorFor(model => model.Photo, new { htmlAttributes = new { @class = "form-control" } })*@
<input type="file" name="UpdatePhoto" />
@Html.HiddenFor(model=>model.emp.Photo)
@Html.ValidationMessageFor(model => model.emp.Photo, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.emp.DOB, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.emp.DOB, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.emp.DOB, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.emp.CourseId, "CourseId", htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@foreach(var course in @Model.empCourse)
{
@Html.RadioButtonFor(m => m.SelectDepartment, course.CourseId) @course.CourseName
}
@*@Html.DropDownList("CourseId", null, htmlAttributes: new { @class = "form-control" })*@
@Html.ValidationMessageFor(model => model.emp.CourseId, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Save" class="btn btn-default" />
</div>
</div>
</div>
}
<div>
@Html.ActionLink("Back to List", "Index")
</div>
@section Scripts
{
@Scripts.Render("~/bundles/jqueryval")
<script type="text/javascript">
$(document).ready(function () {
$('input:text.date').datepicker();
});
</script>
}
控制器编辑
public ActionResult Edit(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
var empsingle = db.Employees.Single(x => x.EmpId == id);
EmployeeCourseViewModel empcourseViewModel = new EmployeeCourseViewModel
{
emp = empsingle,
empCourse = db.Courses.ToList()
};
ViewBag.Gender = new SelectList(db.Genders, "GValue", "GText", empsingle.Gender);
return View(empcourseViewModel);
}
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit([Bind(Include = "EmpId,FirstName,LastName,Gender,EmailAddress,PersonalWebSite,Photo,DOB,CourseId,SelectDepartment")]
EmployeeCourseViewModel empCourseVM, HttpPostedFileBase UpdatePhoto)
{
if (ModelState.IsValid)
{
if (UpdatePhoto == null)
{
//;
}
else
{
string filePath = Server.MapPath("~/Images/" + UpdatePhoto.FileName);
UpdatePhoto.SaveAs(filePath);
empCourseVM.emp.Photo = "~/Images/" + UpdatePhoto.FileName;
}
empCourseVM.emp.CourseId = empCourseVM.SelectDepartment;
db.Entry(empCourseVM.emp).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
else
{
ViewBag.Gender = new SelectList(db.Genders, "GValue", "GText", empCourseVM.emp.Gender);
return View(empCourseVM);
}
}
}
当我尝试调试时，viewmodel对象为emp和empcourse返回null [empCourseVM.emp.CourseId = empCourseVM.SelectDepartment;]。我尝试过很多建议，但没有帮助我。请帮我解决这个问题。我正在使用MVC5，EF6和VS2015专业版。 对不起，很长的帖子。
员工类
[MetadataType(typeof(EmployeeMap))]
public partial class Employee { }
public class EmployeeMap
{
[HiddenInput(DisplayValue = false)]
//[ScaffoldColumn(false)]
[Key]
public int EmpId { get; set; }
[DisplayName("First Name")]
[Required]
public string FirstName { get; set; }
[Required]
[DisplayName("Last Name")]
public string LastName { get; set; }
[Required]
[StringLength(1, MinimumLength =1, ErrorMessage ="Gender should be single character")]
public string Gender { get; set; }
[Required]
[DataType(DataType.EmailAddress)]
[DisplayName("Email Address")]
public string EmailAddress { get; set; }
[DataType(DataType.Url)]
[DisplayName("Personal Web Site")]
public string PersonalWebSite { get; set; }
public string Photo { get; set; }
[Required]
//[DataType(DataType.Date)]
[DisplayFormat(DataFormatString ="{0:MM/dd/yyyy}", ApplyFormatInEditMode =true)]
public DateTime DOB { get; set; }
//public HttpPostedFileBase user_image_data { get; set; }
}
课程班
public class CourseMap
{
[Key]
[DisplayName("Course Id")]
public int CourseId{ get; set; }
[DisplayName("Course Name")]
[Required]
public string CourseName { get; set; }
}
