您好我试图找到解决我问题的方法,但我不能。我有一个有一个论文和许多关键词的课程
public class ThesisWithKeywordsModel
{
public Thesis thesis { get; set; }
public IQueryable<Keyword> keywords { get; set; }
public IEnumerable<int> checkboxList { get; set; }
}
动作
[HttpGet]
public ActionResult CreateThesis()
{
ThesisWithKeywordsModel thesis = new ThesisWithKeywordsModel();
thesis.thesis = new Thesis();
thesis.keywords = db.KeywordRepository.GetAllKeywords();
thesis.checkboxList = new List<int>();
return View(thesis);
}
我使用 thesis.keywords 来显示复选框按钮列表,然后我将 thesis.checkboxList 保存为来自视图的返回结果谁必须是ICollection(int)id&# 39;来自选中的复选框按钮。
这是我的观点
@model SearchSystem.Models.ThesisWithKeywordsModel
@{
var listField = new List<SelectListItem>();
listField.Add(new SelectListItem() { Text = "Софтуер", Value = "Софтуер", Selected = true });
listField.Add(new SelectListItem() { Text = "Хардуер", Value = "Хардуер" });
listField.Add(new SelectListItem() { Text = "Мрежи", Value = "Мрежи" });
var listFree = new List<SelectListItem>();
listFree.Add(new SelectListItem() { Text = "Свободна", Value = "Свободна", Selected = true });
listFree.Add(new SelectListItem() { Text = "Заета", Value = "Заета" });
}
@using (Html.BeginForm("CreateThesis", "ProfessorProfile", FormMethod.Post))
{
<table class="table">
<tr>
<td>@Html.LabelFor(x => x.thesis.ThesisTitle)</td>
<td>@Html.EditorFor(x => x.thesis.ThesisTitle)</td>
</tr>
<tr>
<td>@Html.LabelFor(x => x.thesis.ThesisDescription)</td>
<td>@Html.EditorFor(x => x.thesis.ThesisDescription)</td>
</tr>
<tr>
<td>@Html.LabelFor(x => x.thesis.Field)</td>
<td>@Html.DropDownList("Field", listField)</td>
</tr>
<!--<tr>
<td>@Html.LabelFor(x => x.thesis.Free)</td>
<td>@Html.DropDownList("Free", listFree)</td>
</tr>-->
</table>
foreach(var keyword in Model.keywords)
{
<input type="checkbox" id="@keyword.KeywordId" name="checkboxList" value="@keyword.KeywordId">
<label for="@keyword.KeywordId">@keyword.Value</label><br/>
}
<input type="submit" value="Create"/>
}
这是我的另一个动作
[HttpPost]
public ActionResult CreateThesis(ThesisWithKeywordsModel thesis)
{
if (ModelState.IsValid)
{
var loggedProfessorId = db.ProfessorRepository.GetProfessorIDByUserName(User.Identity.Name);
if (loggedProfessorId != 0)
{
var professor = db.ProfessorRepository.GetProfessorById(loggedProfessorId);
db.ProfessorRepository.AddThesis(professor, thesis.thesis);
return RedirectToAction("MyTheses");
}
return RedirectToAction("Login", "Account");
}
return View(thesis);
}
问题是对象 ThesisWithKeywordsModel论文为null,论文.thesis,thesis.checkboxList都为null。有趣的是,当我在响应主体中看到响应时,我有POST参数,如果我用论文论文更改 ThesisWithKeywordsModel论文,我拥有从表单发布的所有值。
答案 0 :(得分:1)
首先,我不会尝试将IQueryable用于Keywords
属性,更好的方法是使用IList。其次,将Keywords和CheckboxList组合成一个属性可能会更好,让你的关键字类是这样的:
public class Keyword
{
public int KeywordId {get;set;}
public bool Checked {get;set;}
}
所以ThesisWithKeywordsModel
看起来像这样:
public class ThesisWithKeywordsModel
{
public Thesis thesis { get; set; }
public IList<Keyword> keywords { get; set; }
}
然后在您的控制器中,您应该能够:
thesis.keywords = db.KeywordRepository.GetAllKeywords()
.Select(kw => new Keyword
{
KeyeordId = kw.KeywordId,
Checked = false
}).ToList();
接下来,在向视图中传送值列表时,需要将cshtml中的foreach
循环更改为for
循环。
for(var i = 0; i < Model.keywords.Count; i++)
{
<input type="checkbox" id="@Model.keywords[i].KeywordId" name="checkboxList" checked='@Model.keywords[i].Checked ? "checked" : ""'>
<label for="@Model.keywords[i].KeywordId">@Model.keywords[i].Value</label><br/>
}