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“控制器、动作、模型"并非所有代码路径都返回值
[英] "Controller, Action, Model" not all code paths return a value
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问题描述
我真的被这个错误不是所有的代码路径都返回一个值"搞糊涂了.在我的行动 PostResponse 上.我已经盯着我的模型、控制器和视图看了几个小时，我想我已经涵盖了所有路径.当然项目不会构建，所以我无法进一步调试.
我的行动
//POST:/Questions/ViewQuestion/5[HttpPost][验证AntiForgeryToken]public ActionResult PostResponse([Bind(Include = "UserId,QuestionID,Answer,Source,Status,DateStamp")] 响应响应){如果(模型状态.IsValid){db.Responses.Add(response);db.SaveChanges();}}
我的观点
@model Template.Models.Question@using Microsoft.AspNet.Identity@{ViewBag.Title = "查看问题";var qtype = Model.QuestionTypeId;ViewBag.Number = Model.Id - 7;}@using (Html.BeginForm("Question", "ViewQuestion", FormMethod.Post, new { @class = "form-horizontal", role = "form" }))<div><h4>问题#@ViewBag.Number</h4><小时/><h1>@Model.Question1</h1>
<div class="form-group">@switch (qtype){情况1://文本框@Html.TextArea("Answer", new { @class = "form-control", rows = "4", col = "5" });休息;案例2:// 落下<select class="form-control";id="答案">@foreach(Model.QuestionOptions.OrderBy(o => o.QuestionOptionRanking) 中的变量项目){<选项值=@item.QuestionOption1">@item.QuestionOption1</option>}</选择>休息;案例3://复选框<div class="checkbox">@foreach(Model.QuestionOptions.OrderBy(o => o.QuestionOptionRanking) 中的变量项目){<输入类型=复选框"名称=答案"值=@item.QuestionOption1"；/>@item.QuestionOption1
}
休息;案例4://单选按钮foreach(Model.QuestionOptions.OrderBy(o => o.QuestionOptionRanking) 中的变量项){<div class="radio"><标签><输入类型=收音机"名称=答案"值=@item.QuestionOption1"；/>@item.QuestionOption1
}休息;}
@using Template.Models.Response@Html.HiddenFor(r => r.Responses, new { UserId = User.Identity.GetUserId(), Source = "Web", Status = "New", DateStamp = System.DateTime.Now })<div class="form-group"><div class="col-md-offset-2 col-md-10"><输入类型=提交"class="btn btn-default";值=答案"/>
<br/><小时/><p>@Html.ActionLink("Previous", "ViewQuestion", new { id = Model.Id - 1 }) |@Html.ActionLink("Next", "ViewQuestion", new { id = Model.Id + 1 })</p>
页面显示完美，但我无法测试发布操作，因为我无法使用当前错误构建.
解决方案
解决了；但它几乎是从头开始的，因为我创建了一个新的 ViewModel 并使用它来填充响应.
[HttpPost]public ActionResult ViewQuestion([Bind(Include = "QuestionId, Answer, UserId")] ResponseViewModel responseViewModel){响应 re = new Models.Response();re.Answer = responseViewModel.Answer;re.UserId = responseViewModel.UserId;re.QuestionId = responseViewModel.QuestionId;re.DateStamp = System.DateTime.Now;db.Responses.Add(re);db.SaveChanges();return RedirectToAction("ViewQuestion");}
感谢您的意见，因为您的意见让老头再次工作.谢谢！
I am really confused by this error "not all code paths return a value" on my action PostResponse. I have stared at my model, controller and view for hours and I think I have all paths covered. Of course the project won't build, so I can't debug further.
My action
// POST: /Questions/ViewQuestion/5
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult PostResponse([Bind(Include = "UserId,QuestionID,Answer,Source,Status,DateStamp")] Response response)
{
if (ModelState.IsValid)
{
db.Responses.Add(response);
db.SaveChanges();
}
}
My view
@model Template.Models.Question
@using Microsoft.AspNet.Identity
@{
ViewBag.Title = "View question";
var qtype = Model.QuestionTypeId;
ViewBag.Number = Model.Id - 7;
}
@using (Html.BeginForm("Question", "ViewQuestion", FormMethod.Post, new { @class = "form-horizontal", role = "form" }))
<div>
<h4>Question #@ViewBag.Number</h4>
<hr />
<h1> @Model.Question1</h1>
</div>
<div class="form-group">
@switch (qtype)
{
case 1:
// Textbox
@Html.TextArea("Answer", new { @class = "form-control", rows = "4", col = "5" });
break;
case 2:
// Dropdown
<select class="form-control" id="Answer">
@foreach (var item in Model.QuestionOptions.OrderBy(o => o.QuestionOptionRanking))
{
<option value="@item.QuestionOption1">@item.QuestionOption1</option>
}
</select>
break;
case 3:
// Checkbox
<div class="checkbox">
@foreach (var item in Model.QuestionOptions.OrderBy(o => o.QuestionOptionRanking))
{
<input type="checkbox" name="Answer" value="@item.QuestionOption1" /> @item.QuestionOption1 <br />
}
</div>
break;
case 4:
// Radio buttons
foreach (var item in Model.QuestionOptions.OrderBy(o => o.QuestionOptionRanking))
{
<div class="radio">
<label>
<input type="radio" name="Answer" value="@item.QuestionOption1" />
@item.QuestionOption1
</label>
</div>
}
break;
}
</div>
@using Template.Models.Response
@Html.HiddenFor(r => r.Responses, new { UserId = User.Identity.GetUserId(), Source = "Web", Status = "New", DateStamp = System.DateTime.Now })
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" class="btn btn-default" value="Answer" />
</div>
</div>
<br />
<hr />
<p>
@Html.ActionLink("Previous", "ViewQuestion", new { id = Model.Id - 1 }) |
@Html.ActionLink("Next", "ViewQuestion", new { id = Model.Id + 1 })
</p>
The page displays perfectly, but I can't test the post action as I cannot build with the current error.
解决方案
Worked it out; but it was almost from scratch, as I created a new ViewModel and used that to populate the responses.
[HttpPost]
public ActionResult ViewQuestion([Bind(Include = "QuestionId, Answer, UserId")] ResponseViewModel responseViewModel)
{
Response re = new Models.Response();
re.Answer = responseViewModel.Answer;
re.UserId = responseViewModel.UserId;
re.QuestionId = responseViewModel.QuestionId;
re.DateStamp = System.DateTime.Now;
db.Responses.Add(re);
db.SaveChanges();
return RedirectToAction("ViewQuestion");
}
Thanks for your input as your comments got the old head working again. Thanks!
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