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传递一个对象我有一个教师评分系统。当我创建一个关于教师的新评论时,我有一个dropdownlistfor()列表,可供学生选择。我希望该下拉列表在提交时传递课程对象,但是它只是传入null并给我一个错误。我正在使用一个viewbag来显示所有可用的课程。如何使用DropDownListFor
型号:
public class TeachersRatingsWall
{
public int ID { get; set; }
[Range(1, 5, ErrorMessage = "Invalid rating")]
public Int32 StarRating { get; set; }
[Required]
public string PostComment { get; set; }
public DateTime PostDate { get; set; }
[Required]
public string Teacher { get; set; } //? or public Teacher Teacher { get; set; }
public Guid PosterID { get; set; }
public string PosterUserName { get; set; }
//[Required]
public Course Course { get; set; }
public Guid CourseID { get; set; }
}
}
Ropository:
public IQueryable<TeachersRatingsWall> Select()
{
return table.Select(x => new TeachersRatingsWall
{
ID = x.ID,
StarRating = x.StarRating,
PostComment = x.PostComment,
PostDate = x.PostDate,
Teacher = x.Teacher,
PosterID = x.PosterID,
CourseID = x.CourseID,
Course = new Course {
ID = x.CourseID,
CourseNumber = x.CourseEntity.CourseNumber,
Department = x.CourseEntity.Department,
Description = x.CourseEntity.Description,
Name = x.CourseEntity.Name
}
});
}
控制器:
public ActionResult Create()
{
ViewBag.allcourses = coursesservice.GetAllCoursesNamesAndNumbers().Select(x => x.Department + " " + x.CourseNumber);
//-----------------------------------------------------------------------------------------------------------
return View();
}
[HttpPost]
public ActionResult Create(TeachersRatingsWall collection)
{
try
{
// TODO: Add insert logic here
collection.PosterID = ((Guid)Membership.GetUser().ProviderUserKey);
collection.PostDate = System.DateTime.Now;
teacherratingservice.CreateComment(collection);
return RedirectToAction("Index");
}
catch
{
return View();
}
}
视图 - Create.cshtml
<div class="editor-label">
@Html.Label("Course:")
</div>
<div class="editor-field">
@Html.DropDownListFor(model => model.Course, new SelectList(ViewBag.allcourses))
</div>
IQueryable Select()中的所有内容看起来都不错吗? –
TMan
2012-03-05 03:08:44
给我在IList的SelectListItem错误..任何想法为什么?名称空间或类型无法找到它说 – TMan 2012-03-05 03:10:27
是的,你需要改变它填充Model.Courses这就是为什么它给你一个错误 – Raymund 2012-03-05 03:13:33