MVC Razor View在for循环中丢失了变量范围

Question

I have a razor view that loses the variable scope once inside the forloop. It works fine until I added the table tags. So all my calls to the different parts of the ViewModel no longer work. Please let me know if there is anything else that would help to know.

@model Auditor_Evaluations_MVC.ViewModels.EvaluationViewModel

@using (Html.BeginForm())
{
    <div>
        <table class="table table-condensed" style="width:825px;"> 
            for(int i = 0; i < Model.QuestionGroup.Count; i++)
            {       
                var questionGroup = Model.QuestionGroup[i];
                @Html.HiddenFor(m => Model.QuestionGroup[i].GroupName)
                @Html.HiddenFor(m => Model.QuestionGroup[i].GroupId)
                <thead>
                    <tr>
                        <th class="text-left">@Html.Label(questionGroup.GroupName) </th>
                        <th class="text-center">Excellent</th>
                        <th class="text-center">Good</th>
                        <th class="text-center">Fair</th>
                        <th class="text-center">Poor</th>
                        <th class="text-center">N/A</th>
                    </tr>
                </thead>
                var questions = questionGroup.Questions;
                for(int j = 0; j < questions.Count; j++)
                {  
                    @Html.HiddenFor(m => Model.QuestionGroup[i].Questions[j].QuestionName)     
                    <tr>
                        <td class="text-left">@Html.Label(questions[j].QuestionName) </td>
                            var questionResponse = questions[j].QuestionResponses;
                            @for(int k = 0; k < questionResponse.Count; k++)
                            {
                                <td class="text-center" style="width:75px">
                                    @Html.RadioButtonFor(m => Model.QuestionGroup[i].Questions[j].SelectedAnswer,questionResponse[k].QuestionValue)

                                </td>
                            }

                    </tr>

                }   
                }             


            <tr>
                <td colspan="6">&nbsp;</td>
            </tr>
            <tr>
                <td colspan="6"><strong>@Model.GeneralQuestion1Text</strong></td>
            </tr>
            <tr>
                <td colspan="6">@Html.TextAreaFor(m => m.GeneralQuestion1Value)</td>
            </tr>
            <tr>
                <td colspan="6"><strong>2. Additional Comments:</strong></td>
            </tr>
            <tr>
                <td colspan="6">@Html.TextAreaFor(m => m.GeneralQuestion2Value)</td>
            </tr>
            <tr>
                <td colspan="6"><strong>3. Would you like the appropriate audit manager to contact you regarding any or all of the information relayed through this questionnaire? If yes, please include your name and telephone number.</strong></td>
            </tr>
            <tr>
                <td colspan="6">@Html.TextAreaFor(m => m.GeneralQuestion3Value)</td>
            </tr>
            <tr>
                <td colspan="6"><input type="submit" value="Submit"/></td>
            </tr>
        </table>
    </div>
}

Answer 1

I'm not 100% sure on exactly what your problem is, the question is a little confusiing, but all the places where you do something like this:

@Html.HiddenFor(m => Model.QuestionGroup[i].GroupName)

Should probably be replaced with

@Html.HiddenFor(m => m.QuestionGroup[i].GroupName)

ie use the m variable to represent your model in the lambda expression, rather than referencing the Model property.

Also, on this line:

<table class="table table-condensed" style="width:825px;"> 
     for(int i = 0; i < Model.QuestionGroup.Count; i++)

You need to add an @ in front of the for keyword.

Answer 2

Try using a foreach in that Razor block

foreach(var question in Model.QuestionGroup) {
  @Html.HiddenFor(m => m.question.GroupName)
  @Html.HiddenFor(m => m.question.GroupId)
...
etc.

update: you may need to look into the EditorFor and EditorForModel HTML helpers if your model is not mapping to the correct ViewModel when send it