為什么模型不會在后期傳回控制器？

這個程序在其他地方也有效。我看不到視圖沒有將模型回傳給控制器。我重寫了模型、視圖和操作方法。盡管如此，還是沒有喜悅。

我的模型沒有在后期傳回控制器。我在應用程式的另一部分執行此操作，它作業正常。我可能錯過了一些東西，但我已經過了兩天了，我看不到它。我希望你能提供幫助。

我的觀點：

@model Towins.Models.T_Complaints
@{
  ViewBag.Title = "UpsertComplaint";
  Layout = "~/Views/Shared/_Layout.cshtml";
}

@using (Html.BeginForm("UpsertComplaint_Post", "Home", FormMethod.Post))
{
@Html.AntiForgeryToken()

// The model is working on the get. 
// The date has been supplied in the get and I have it in the view. 
// The Model.Id == 0 as this is the add portion of the upsert. 
// Can't even start working on the update portion as the model is not coming back at all.

<h4>@(Model.Id!=0 ? "Edit" : "Add") Complaint</h4>
<hr />
@Html.HiddenFor(model => model.Id)
@Html.HiddenFor(model => model.WreckerID)
<div class="container text" style="text-align: center">
    <div class="form-row">
        <div class="form-group col-6">
            <label for="NewWrecker" class="col-form-label">Wrecker Company Name</label>
            <input type="text" disabled class="form-control" id="WreckerCo" name="WreckerCo" value="@ViewBag.WreckerCo" />
        </div>
    </div>
    <div class="form-row">
        <div id="DateOfComplaint-group" class="input-group date form-group col-6" data-date-format="dd/mm/yyyy">
            <label for="ComplaintDate" class="col-form-label">Complaint Date:&nbsp;</label>
            @Html.EditorFor(model => model.ComplaintDate, "{0:mm/dd/yyyy}", new { htmlAttributes = new { @class = "form-control" } })
            <span class="input-group-addon"><i class="glyphicon glyphicon-calendar"></i></span>
        </div>
    </div>

    // Model Fields deleted for brevity

    <div class="form-group row col-6">
            <div class="col-12 row">
                <div class="col-6">
                    <input type="submit" name="NewComplaint" class="btn btn-primary" value="Save" />
                </div>
                <div class="col-6">
                    <a href="@Url.Action("ComplaintList", new { wId = ViewBag.WreckerId })" class="btn btn-primary">Back to Complaints List</a>
                </div>
            </div>
        </div>
</div>

}

我的控制器：這是正確發布但模型為空

    [HttpPost]
    public ActionResult UpsertComplaint_Post(T_Complaints complaint)

    {

    // complaint is null here.
    // This is as far as I have gotten. I can't copmplete the post code until I
    // can get the model back to this point.

        return RedirectToAction("ComplaintList", new RouteValueDictionary(new { wId = complaint.WreckerID }));
    }

And just for completeness, here is the model:

    public class T_Complaints
{
    public int Id { get; set; }
    [DataType(DataType.MultilineText)]
    public string Complaint { get; set; }
    [DataType(DataType.MultilineText)]
    [Display(Name = "Complainant Info")]
    public string ComplainantInfo { get; set; }
    [Required]
    public int WreckerID { get; set; }
    [Required]
    public bool Resolved { get; set; }
    [Required]
    [DataType(DataType.Date)]
    [Display(Name = "Complainant Date")]
    public DateTime ComplaintDate { get; set; }
    [DataType(DataType.Date)]
    [Display(Name = "Resolution Date")]
    public DateTime ResolutionDate { get; set; }
    [DataType(DataType.MultilineText)]
    public string Resolution { get; set; }
}

Here is the Get Action

       [HttpGet]
    public ActionResult UpsertComplaint(int? cid, string WreckerCo, int wId)
    {
        T_Complaints complaint = new T_Complaints();
        ViewBag.WreckerCo = WreckerCo;
        ViewBag.wId = wId;
        if (cid == null)

        // This is true so this is the block that executes on Add

        {
            complaint.ComplaintDate = DateTime.Now;
            complaint.WreckerID = wId;
            return View(complaint);
        }
        using (con)
        {
            con.Open();
            using (SqlCommand cmd = new SqlCommand("SELECT * FROM [Towins].[dbo].[T_Complaints] WHERE Id = "   cid, con))
            {
                SqlDataReader reader = cmd.ExecuteReader();
                if (reader.HasRows)
                {
                    while (reader.Read())
                    {
                        complaint.Resolved = (bool)reader["Resolved"];
                        complaint.Id = (int)reader["Id"];
                        complaint.Complaint = reader["Complaint"].ToString();
                        ViewBag.WreckerId = reader["WreckerID"];
                        complaint.ComplainantInfo = reader["ComplainantInfo"].ToString();
                        complaint.ComplaintDate = (DateTime)reader["ComplaintDate"];
                        if (reader["ResolutionDate"].ToString() != "")
                        {
                            complaint.ResolutionDate = (DateTime)reader["ResolutionDate"];
                        }
                        complaint.Resolution = reader["Resolution"].ToString();
                    };
                }
                reader.Close();
            }
            con.Close();
        }
        return View(complaint);
    }

Okay. I've gotten some downgrades for insufficient research and not posting the question properly. I'm going to reattempt to get this question answered. I have simplified everything with test code and reposted it here:

My new test model in it's entirety:

namespace Towins.Models
{
    public class T_ComplaintsTest
    {
        public int Id { get; set; }
        public string Complaint { get; set; }
    }
}

My new test View in its entirety:

@model Towins.Models.T_ComplaintsTest

@{
    ViewBag.Title = "AddComplaint";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Add Complaint</h2>


@using (Html.BeginForm("AddComplaint", "Home", FormMethod.Post))
{
    <div class="text" style="text-align: center">
        <div class="form-row">
            <div class="form-group col-6">
                @Html.LabelFor(model => model.Complaint)
                @Html.EditorFor(model => model.Complaint, new { htmlAttributes = new { @class = "form-control" } })
            </div>
        </div>

        <div class="form-group row col-6">
            <div class="col-12 row">
                <div class="col-6">
                    <input type="submit" name="AddComplaint" class="btn btn-primary" value="Save" />
                </div>
            </div>
        </div>
    </div>
}

And, my action methods in their entirety:

    [HttpGet]
    public ActionResult AddComplaint()
    {
        T_ComplaintsTest complaint = new T_ComplaintsTest();
        complaint.Complaint = "Test";
        return View(complaint);
    }
    [HttpPost]
    public ActionResult AddComplaint(T_ComplaintsTest complaint)

    {
        //Breakpoint here.  Why is complaint null?
        return RedirectToAction("ComplaintList", new RouteValueDictionary(new { wId = 247 }));
    }

When the Get occurs, it successfully renders "Test" in the field. When I hit the submit button, it stops at the breakpoint "return RedirectToAction..." Why at this point is complaint null? I can see no reason for the life of me why it should be null. The view is of this Model. Should it not be there?

uj5u.com熱心網友回復：

答案很簡單，模型系結器變得混亂。

在您的T_Complaints班級中，您有一個名為Complaint.
在您的發布操作中，您使用了投訴作為模型名稱：

public ActionResult AddComplaint(T_ComplaintsTest complaint)

簡單地更改控制器中的模型名稱將使模型系結器的事情變得不那么復雜，并且您的模型不會為空。

public ActionResult AddComplaint(T_ComplaintsTest complaintsTest) // this won't be null anymore.

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