MVC 4 强类型视图未传递控制器的模型
本文关键字：控制器 模型 强类型 视图 MVC | 更新日期: 2023-09-27 17:57:05
不久前，我在当前的MVC 4项目中构建了一个维护请求功能。 它的效果很好，所以当我需要添加另一个类似的工具请求功能时，我遵循相同的构图，只是稍微修改了表格和模型属性等。 现在，由于工具请求控制器中的某种原因，模型绑定似乎都不起作用（每个 httppost 方法都会收到正在传递的模型的空值）。
对于该功能，我创建了 3 个模型。 本质上，一个包含所有请求的列表，一个是每个请求本身的模型，其中包含与之关联的注释列表，然后第三个是注释模型。
模型：
namespace TeamPortal.Models
{
public class ToolingRequestModels
{
public List<ToolingRequestModel> ToolingRequests { get; set; }
public SelectList Sources { get; set; }
public SelectList Assignees { get; set; }
public SelectList DefectTypes { get; set; }
public ToolingRequestModels()
{
TeamPortalService TPsvc = new TeamPortalService();
Sources = new SelectList(TPsvc.GetToolingRequestSources(), "Text", "Value");
Assignees = new SelectList(TPsvc.GetToolingRequestAssignees(), "Text", "Value");
DefectTypes = new SelectList(TPsvc.GetToolingRequestDefectTypes(), "Text", "Value");
}
public ToolingRequestModels(string ListType)
{
ToolingRequestModels baseModel = new ToolingRequestModels();
TeamPortalService TPsvc = new TeamPortalService();
List<int> RequestIDList = TPsvc.GetToolingRequests(ListType);
List<ToolingRequestModel> tempToolingRequests = new List<ToolingRequestModel>();
foreach (int requestID in RequestIDList)
{
ToolingRequestModel tempToolingRequestModel = new ToolingRequestModel(requestID, baseModel.Sources, baseModel.Assignees, baseModel.DefectTypes);
tempToolingRequests.Add(tempToolingRequestModel);
}
ToolingRequests = tempToolingRequests;
}
}
public class ToolingRequestModel
{
public int RequestID { get; set; }
public string Requester { get; set; }
public DateTime RequestDate { get; set; }
public string Summary { get; set; }
public SelectList Sources { get; set; }
public string Source { get; set; }
public string Description { get; set; }
public SelectList Assignees { get; set; }
public string AssignedTo { get; set; }
public SelectList DefectTypes { get; set; }
public string DefectType { get; set; }
public string Status { get; set; }
public string Model { get; set; }
public DateTime? CompletionDate { get; set; }
public bool CloseRequest { get; set; }
public string AddNote { get; set; }
public List<ToolingNoteModel> Notes { get; set; }
public ToolingRequestModel()
{
TeamPortalService TPsvc = new TeamPortalService();
Sources = new SelectList(TPsvc.GetToolingRequestSources(), "Text", "Value");
Assignees = new SelectList(TPsvc.GetToolingRequestAssignees(), "Text", "Value");
DefectTypes = new SelectList(TPsvc.GetToolingRequestDefectTypes(), "Text", "Value");
}
public ToolingRequestModel(int requestID, SelectList slSources, SelectList slAssignees, SelectList slDefectTypes)
{
TeamPortalService TPsvc = new TeamPortalService();
ToolingRequestModel modelDetails = TPsvc.GetToolingRequestDetails(requestID);
RequestID = requestID;
Requester = modelDetails.Requester;
RequestDate = modelDetails.RequestDate;
Summary = modelDetails.Summary;
Sources = slSources;
Source = modelDetails.Source;
Description = modelDetails.Description;
Assignees = slAssignees;
AssignedTo = modelDetails.AssignedTo;
DefectTypes = slDefectTypes;
DefectType = modelDetails.DefectType;
Status = modelDetails.Status;
Model = modelDetails.Model;
CompletionDate = modelDetails.CompletionDate;
Notes = TPsvc.GetToolingRequestNotes(requestID);
}
}
public class ToolingNoteModel
{
public int ToolingNoteID { get; set; }
public int RequestID { get; set; }
public string NoteText { get; set; }
public string NoteAuthor { get; set; }
public DateTime NoteCreateDate { get; set; }
}
}
为了简化事情，我们可以只查看控制器并查看添加新请求，但是在尝试更新请求时模型绑定也会失败。 相当直接的输入形式，它确实有一个检查来验证我们有模型输入的记录，并且没有找到任何记录，get控制器方法被召回并显示错误消息。
控制器：
[ValidateInput(false)]
public virtual ActionResult ToolingRequestAdd(bool? requestAdd, bool? badModel)
{
ToolingRequestModel model = new ToolingRequestModel();
if (requestAdd == true)
{
ViewBag.RequestAdd = true;
}
else
{
ViewBag.RequestAdd = false;
}
if (badModel == true)
{
ViewBag.BadModel = true;
}
else
{
ViewBag.BadModel = false;
}
return View(model);
}
[HttpPost]
[ValidateInput(false)]
public virtual ActionResult ToolingRequestAdd(ToolingRequestModel model)
{
TeamPortalService TPsvc = new TeamPortalService();
GP10Service gp10svc = new GP10Service();
model.Requester = User.Identity.Name;
model.RequestDate = DateTime.Now;
model.Status = "New";
if (gp10svc.CheckModelCode(model.Model))
{
return RedirectToAction("ToolingRequestAdd", new
{
requestAdd = false,
badModel = true
});
}
TPsvc.SaveToolingRequest(model);
return RedirectToAction("ToolingRequestAdd", new
{
requestAdd = true
});
}
以下是视图：
<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/FixedColumn.Master" Inherits="System.Web.Mvc.ViewPage<TeamPortal.Models.ToolingRequestModel>" %>
<asp:Content ID="Content3" ContentPlaceHolderID="HeadContent" runat="server">
</asp:Content>
<asp:Content ID="Content4" ContentPlaceHolderID="LeftContent" runat="server">
<% Html.RenderPartial("LocalNavToolingRequests"); %>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="RightContent" runat="server">
<div class="box">
<!-- box / title -->
<div class="title">
<h5>
Add Tooling Request</h5>
</div>
<%if (ViewBag.RequestAdd)
{ %>
<div class="messages"><div id="successes0" class="message message-success"><div class="image"><img height="32" src="/Content/images/icons/success.png"></div><div class="text"><h6>Success</h6><span>Tooling Request Saved Successfully.</span></div><div class="dismiss"><a href="#successes0"></a></div></div></div>
<% } %>
<%if (ViewBag.BadModel)
{ %>
<div class="messages"><div id="errors0" class="message message-error"><div class="image"><img height="32" src="/Content/images/icons/error.png"></div><div class="text"><h6>Error</h6><span>The Spa Model Code Entered Was Invalid. Verify The Model Is Still Active And The 3 Digits Are Correct.</span></div><div class="dismiss"><a href="#errors0"></a></div></div></div>
<% } %>
<% using (Html.BeginForm())
{ %>
<div class="form">
<div class="fields">
<div class="field field-first">
<div class="label">
<label>Request Summary:</label>
</div>
<div class="textbox">
<%: Html.TextBoxFor(m=>m.Summary) %>
</div>
</div>
<div class="field">
<div class="label">
<label>Model:</label>
</div>
<div class="textbox">
<%: Html.TextBoxFor(m=>m.Model) %>
</div>
</div>
<div class="field">
<div class="label">
<label>Source:</label>
</div>
<div class="select">
<%: Html.DropDownListFor(m => m.Source, Model.Sources)%>
</div>
</div>
<div class="field">
<div class="label">
<label>Defect Type:</label>
</div>
<div class="select">
<%: Html.DropDownListFor(m => m.DefectType, Model.DefectTypes)%>
</div>
</div>
<div class="field">
<div class="label">
<label>Description:</label>
</div>
<div class="textarea textarea-editor">
<%: Html.TextAreaFor(m => m.Description, 12, 70, new { @class = "tinymce-simple" })%>
</div>
</div>
<% if (HttpContext.Current.User.IsInRole("Tooling"))
{ %>
<div class="field">
<div class="label">
<label>Assign Request To:</label>
</div>
<div class="select">
<%: Html.DropDownListFor(m => m.AssignedTo, Model.Assignees)%>
</div>
</div>
<%} %>
</div>
</div>
<input id="submit" name="submit" type="submit" value="Submit Request" />
<%} %>
</div>
</asp:Content>
作为一种解决方法，我可以在保存或重定向之前使用 FormCollection 重新创建一个新模型并填充所需的属性，但是我真的很想知道我在这里出错的地方（加上 FormCollection 很痛苦）。
非常奇怪的是，在维护请求正常工作的情况下，这失败了。 我认为复制我以前的过程可以节省我的时间......
希望这个问题不是"太本地化"，似乎可能取决于解决方案，如果是这种情况，我可以在其他地方重新发布。
任何帮助都会很棒，如果我包含足够（或太多）的代码/信息，请告诉我。 谢谢！
当默认模型绑定器无法解析要绑定到哪个控制器参数时，它将无法绑定（返回 null）。
从 View 代码来看，您还必须具有一个名为 Model 的模型属性。 我会说这是在默认模型绑定器中与ToolingRequestAdd HttpPost 控制器中的参数名称model冲突。
如果您将参数名称从 model 更改为其他类似 toolingRequestModel ，我想这会解决问题。
例如：
[HttpPost]
[ValidateInput(false)]
public virtual ActionResult ToolingRequestAdd(ToolingRequestModel toolingRequestModel)
{
TeamPortalService TPsvc = new TeamPortalService();
GP10Service gp10svc = new GP10Service();
toolingRequestModel.Requester = User.Identity.Name;
.
.
.