模型在Child Partial页面MVC5上的帖子上为空
我试图在用户填写表单后获取所有数据，但是当我尝试访问模型作为操作参数时，我总是将模型作为空值。 因此，我尝试使用FormCollection，但仍然无法计算如何访问埋在QuestionModel内的PossibleAnswerModel的列表。 非常感激你的帮助
UPDATE
在阅读Chris Pratt评论后，我将所有内容都更新为以下内容但我仍然无法获得TestModel的填充。 每次问题（TestModel测试，FormCollection formCollection）做POST索引操作得到调用我甚至尝试把一个[HttpPost]公共ActionResult问题（TestModel测试，FormCollection formCollection），但没有得到填充视图数据。 请帮忙
///////////////楷模//////////////
[Serializable]
public class TestModel
{
private QuestionModel _currenQuestionModel;
public int TestID { get; set; }
public string TestName { get; set; }
public string Instructions { get; set; }
public double TestTime { get; set; }
public QuestionModel CurrenQuestionModel
{
get
{
if (_currenQuestionModel == null &&
Questions != null &&
Questions.Count > 0)
_currenQuestionModel = Questions.First();
return _currenQuestionModel;
}
set { _currenQuestionModel = value; }
}
public List<QuestionModel> Questions { get; set; }
}
public class QuestionModel
{
public int QuestionID { get; set; }
public string Question { get; set; }
public bool HasMultipleAnswers { get; set; }
public IList<PossibleAnswerModel> PossibleAnswers { get; set; }
}
public class PossibleAnswerModel
{
public bool IsSelected { get; set; }
public string DisplayText { get; set; }
}
}
//////////////////控制器/////////////////
public class TestController : Controller
{
public ActionResult Index(int id)
{
var model = _testColletion.FirstOrDefault(r => r.TestID == id);
return View(model);
}
[ChildActionOnly]
[HttpGet]
public ActionResult Questions(TestModel test)
{
var testModel = _testColletion.Single(r => r.TestID == test.TestID);
return PartialView("_Start", testModel);
}
[HttpPost]
public ActionResult Questions(TestModel test, FormCollection formCollection)
{
var q = formCollection.Count >2 ? formCollection.GetValues(1):null;
var testModel = _testColletion.FirstOrDefault(r => r.TestID == test.TestID);
//if (questionID == 0)
//{
// testModel.CurrenQuestionModel = testModel.Questions.First();
//}
if (!string.IsNullOrWhiteSpace(Request["next"]))
{
var nextQuestionIndex =
testModel.Questions.FindIndex(r => r.QuestionID == testModel.CurrenQuestionModel.QuestionID) + 1;
testModel.CurrenQuestionModel = testModel.Questions[nextQuestionIndex];
}
else if (!string.IsNullOrWhiteSpace(Request["prev"]))
{
var prevQuestionIndex =
testModel.Questions.FindIndex(r => r.QuestionID == testModel.CurrenQuestionModel.QuestionID) - 1;
testModel.CurrenQuestionModel = testModel.Questions[prevQuestionIndex];
}
return PartialView("_Question", testModel);
}
private static List<TestModel> _testColletion = new List<TestModel>()
{
new TestModel()
{
TestID = 1,
TestName = "ASP.NET",
Instructions = "Please choose from appropriate options",
TestTime = 2.40,
Questions = new List<QuestionModel>()
{
new QuestionModel(){QuestionID = 1, Question = "Question 1"}
}
},
new TestModel()
{
TestID = 2,
TestName = "ASP.NET MVC",
Instructions = "Please choose from appropriate options",
TestTime = 1.00,
Questions = new List<QuestionModel>()
{
new QuestionModel(){QuestionID = 1, HasMultipleAnswers=true, Question = "Question 1", PossibleAnswers = new List<PossibleAnswerModel>()
{
new PossibleAnswerModel(){DisplayText = "Possible Answer 1"},
new PossibleAnswerModel(){DisplayText = "Possible Answer 2"},
new PossibleAnswerModel(){DisplayText = "Possible Answer 3"},
new PossibleAnswerModel(){DisplayText = "Possible Answer 4"},
}},
new QuestionModel(){QuestionID = 2, HasMultipleAnswers=true, Question = "Question 2"},
new QuestionModel(){QuestionID = 3, HasMultipleAnswers=true, Question = "Question 3"},
new QuestionModel(){QuestionID = 4, HasMultipleAnswers=true, Question = "Question 4"},
new QuestionModel(){QuestionID = 5, HasMultipleAnswers=true, Question = "Question 5"},
}
},
new TestModel()
{
TestID = 3,
TestName = "ASP.NET Spring",
Instructions = "Please choose from appropriate options",
TestTime = 1.00,
Questions = new List<QuestionModel>()
{
new QuestionModel(){QuestionID = 1, Question = "Question 1"},
new QuestionModel(){QuestionID = 2, Question = "Question 2"},
new QuestionModel(){QuestionID = 3, Question = "Question 3"},
new QuestionModel(){QuestionID = 4, Question = "Question 4"},
}
},
new TestModel()
{
TestID = 4,
TestName = ".NET C#",
Instructions = "Please choose from appropriate options",
TestTime = 4.40,
Questions = new List<QuestionModel>()
{
new QuestionModel(){QuestionID = 1, Question = "Question 1"},
new QuestionModel(){QuestionID = 2, Question = "Question 2"}
}
}
};
}
///////////里面_Question.cshtml局部视图///////////////
@model InterviewQ.MVC.Models.TestModel
@using (Html.BeginForm())
{
@Html.ValidationSummary(true)
@*@Html.HiddenFor(r => r.CurrentQuestionID)*@
<div>
<br />
<h4>Question @Model.CurrenQuestionModel.QuestionID</h4>
<hr />
<p>@Model.CurrenQuestionModel.Question</p>
</div>
<p>
@if (Model.CurrenQuestionModel.HasMultipleAnswers)
{
@Html.Partial("_MultipleAnswerQuestionView", Model.CurrenQuestionModel)
}
</p>
<p>
@if (Model.CurrenQuestionModel.QuestionID > 0 && Model.CurrenQuestionModel.QuestionID < Model.Questions.Count)
{
if (Model.CurrenQuestionModel.QuestionID > 1)
{
<input type="submit" class="btn btn-default" value="Previous" name="prev" />
}
<input type="submit" class="btn btn-default" value="Next" name="next" />
}
@if (Model.CurrenQuestionModel.QuestionID == Model.Questions.Count)
{
<input type="submit" class="btn btn-default" value="Finish" name="finish" />
}
</p>
}
////////////里面_MultipleAnswerQuestionView.cshtml局部视图///////////////
@model InterviewQ.MVC.Models.QuestionModel
@if (!Model.HasMultipleAnswers)
{
throw new InvalidOperationException("This answer optioin template doesn't support this type of questions");
}
@for(var i=0; i< Model.PossibleAnswers.Count; i++)
{
<div class="row">
<div class="col-lg-6">
<div class="input-group">
<span class="input-group-addon">
<input type="checkbox" value="@Model.PossibleAnswers[i].IsSelected" name="possibleAnswers">
</span>
<p>
@Model.PossibleAnswers[i].DisplayText
</p>
</div><!-- /input-group -->
</div><!-- /.col-lg-6 -->
</div><!-- /.row -->
}
但我仍然无法获得@ Model.PossibleAnswers [i]在帖子中的价值，我错过了任何事情
问题是您的发布数据都不匹配模型上的任何内容。 举几个例子：
当你取出CurrentQuestion ，它将从Model.Questions的上下文中Model.Questions ，所以生成的字段名称将以CurrentQuestion开头，而不是Questions[N] ，其中N是该问题的索引。 马上就没有办法填充这个Questions属性，并且你的模型没有CurrentQuestion属性来绑定数据。
当你将CurrentQuestion传递给你的部分时，你甚至会松开这个上下文，所以现在你所有的部分字段名都没有前缀。 例如，像Html.TextBoxFor(m => m.Foo)这样的名称最终只有Foo的名称，它的名称与模型的结构不匹配。
然后，在你的部分内部，你正在使用一个抛弃了更多上下文的foreach 。 在迭代Model.PossibleAnswers每个字段名称最终会像item.IsSelected一样，而不是像item.IsSelected PossibleAnswers[N].IsSelected那样实际使用的东西，其中N是PossibleAnswers项目的索引。
除此之外，您的复选框甚至没有名称属性。 所以永远不会发布任何价值。 期。
总而言之，您最好回传字段名称，模型绑定者无法匹配模型上的任何内容，最糟糕的是，在某些情况下，您根本没有发布任何内容。 难怪你得到一个空模型。
在任何时候，您都必须维护属性上下文，以便Razor可以生成模型绑定器可以使用的字段名称。 因此，不应传递CurrentQuestion ，而应将Model.Questions[N]传递给partial。 当遍历将有可编辑字段的列表时，您需要使用for而不是foreach ，以便您可以传递索引属性以给Razor提供所需的上下文： Model.PossibleAnswers[N].IsSelected 。
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