在 MVC 4 模型中提交表单在控制器发布方法中为空

Question

所以我现在的问题是，当我提交以下表单时，我无法将模型放入控制器中。我试图让 BillingCodes（这是 BillingCodeObjects 列表）中的项目循环并显示。我已经从这些代码中删除了一些与实际情况无关的代码，以使其更短且更易于阅读。

这是我的观点的代码......

@using (Html.BeginForm("SubmitTimesheet", "Timesheet", FormMethod.Post))
{


foreach (var item in Model.BillingCodes)
{

    <div class="button-padding">
        <a class="btn btn-large btn-danger btn-block billCodeBtn">
            <div class="btnText">@item.Name</div>
            <div class="btnTime">@item.TotalHours</div>

            <i class="icon-chevron-down billCodeIconUp billCodeIcon"></i>
            <i class="hidden icon-chevron-up billCodeIconDown billCodeIcon"></i>
        </a>

        <div class="content" >
            <div class="row timeEntry">
                <p></p>
                <div class="col-12 col-lg-2">
                    Enter Time: 
        <div class="row">
            <div class="col-12">
                @Html.DropDownListFor(model => item.EnterTimeHours, new SelectList(new[] {
                    new { Value = "0", Text = "0" },
                    new { Value = "1", Text = "1" },
                    new { Value = "2", Text = "2" },
                    new { Value = "3", Text = "3" },
                    new { Value = "4", Text = "4" },
                    new { Value = "5", Text = "5" },
                    new { Value = "6", Text = "6" },
                    new { Value = "7", Text = "7" },
                    new { Value = "8", Text = "8" },
                    new { Value = "9", Text = "9" },
                    new { Value = "10", Text = "10" },
                    new { Value = "11", Text = "11" },
                    new { Value = "12", Text = "12" },
                }, "Value", "Text")) <b>:</b> 
                @Html.DropDownListFor(model => item.EnterTimeMinutes, new SelectList(new[] {
                    new { Value = "0", Text = "00" },
                    new { Value = "15", Text = "15" },
                    new { Value = "30", Text = "30" },
                    new { Value = "45", Text = "45" },
                }, "Value", "Text"))

            </div>
        </div>
                </div>
                <div class="col-lg-2"></div>

                <div class="col-lg-1"></div>
                <div class="control-group col-12 col-lg-2">
                    <label class="checkbox">
                        Billable @Html.CheckBoxFor(model => item.Billable)
                    </label>
                </div>
                <div class="col-12 col-lg-2">
                    Enter Memo:
        <div class="row">
            <div class="col-12">
                @Html.TextAreaFor(model => item.Comment)
            </div>
        </div>

这是我的控制器的一些代码：

public class TimesheetController : Controller
{
    //
    // GET: /Timesheet/

    public ActionResult Index()
    {

        string getBillingCodeUrl ="";

      //SOME CODE REMOVED FOR LENGTH / READABILITY 

        foreach (var entryItem in timePeriod.TimeEntries[0].EntryCollection)
        {
            foreach (var billingItem in billingCodeList.BillingCodes)
            {
                if (entryItem.BillingCode == billingItem.Name)
                {
                    //update record in billingItem with data from entryItem
                    billingItem.Comment = entryItem.Comment;
                    billingItem.Billable = entryItem.Billable;
                    billingItem.TotalHours = entryItem.Hours;
                }
            }
        }

        return View(billingCodeList);
    }
    [HttpPost]
    public void SubmitTimesheet(BillingCodeList model)
    {

        string uri = "";

        foreach (var billingCode in model.BillingCodes)
        {
           //do stuff with each of these
        }
    }

}
}

最后，这是模型中的信息：

    public class BillingCodeList
    {
        public List<BillingCodeObj> BillingCodes;
    }

    public class BillingCodeObj
    {
        public string Name { get; set; }
        public decimal TotalHours { get; set; }

        public decimal EnterTimeHours { get; set; }
        public decimal EnterTimeMinutes { get; set; }
        public bool Billable { get; set; }
        public string Comment { get; set; }

        public BillingCodeObj(string name, decimal hours)
        {
            this.Name = name;
            this.TotalHours = hours;
        }
        public BillingCodeObj()
        {

        }
    }

这是返回表单时调试本地的图片..

image of locals

Answer 1

您正在对视图进行 foreach，因此输入元素应将值张贴在如下所示的某处： name="BillingCodes[0].EnterTimeHours", name="BillingCodes[0].EnterTimeMinutes" 您可以在网络选项卡中检查 Chrome 开发人员工具 (CTRL+SHIFT+C) 上的请求 或者只是查看源代码。如果是这种情况，您将提交多个 BillingCodeObj 对象。你必须有一个控制器来接收它。

查看源代码，因为这可以极大地帮助您了解幕后发生的事情。

在你的控制器上试试这个：

[HttpPost]
public void SubmitTimesheet(IEnumerable<BillingCodeObj> billingCodes){
}

你也可以（出于调试目的）这样做

public void SubmitTimesheet(FormCollection form){}

并检查表单在调试时是如何填充的。

在 cmets 和提供更多代码之后 将您的视图更改为：

@using (Html.BeginForm("SubmitTimesheet", "Timesheet", FormMethod.Post))
{
    @Html.EditorFor(m=>m.BillingCodes)
}

在 EditorTemplates/BillingCodeObj.cshtml 中创建一个新的 cshtml ：

@model BillingCodeObj
<div class="button-padding">
    <a class="btn btn-large btn-danger btn-block billCodeBtn">
        <div class="btnText">@Model.Name</div>
        <div class="btnTime">@Model.TotalHours</div>

        <i class="icon-chevron-down billCodeIconUp billCodeIcon"></i>
        <i class="hidden icon-chevron-up billCodeIconDown billCodeIcon"></i>
    </a>

    <div class="content" >
        <div class="row timeEntry">
            <p></p>
            <div class="col-12 col-lg-2">
                Enter Time: 
    <div class="row">
        <div class="col-12">
            @Html.DropDownListFor(model => model.EnterTimeHours, new SelectList(new[] {
                new { Value = "0", Text = "0" },
                new { Value = "1", Text = "1" },
                new { Value = "2", Text = "2" },
                new { Value = "3", Text = "3" },
                new { Value = "4", Text = "4" },
                new { Value = "5", Text = "5" },
                new { Value = "6", Text = "6" },
                new { Value = "7", Text = "7" },
                new { Value = "8", Text = "8" },
                new { Value = "9", Text = "9" },
                new { Value = "10", Text = "10" },
                new { Value = "11", Text = "11" },
                new { Value = "12", Text = "12" },
            }, "Value", "Text")) <b>:</b> 
            @Html.DropDownListFor(model => model.EnterTimeMinutes, new SelectList(new[] {
                new { Value = "0", Text = "00" },
                new { Value = "15", Text = "15" },
                new { Value = "30", Text = "30" },
                new { Value = "45", Text = "45" },
            }, "Value", "Text"))

        </div>
    </div>
            </div>
            <div class="col-lg-2"></div>

            <div class="col-lg-1"></div>
            <div class="control-group col-12 col-lg-2">
                <label class="checkbox">
                    Billable @Html.CheckBoxFor(model => model.Billable)
                </label>
            </div>
            <div class="col-12 col-lg-2">
                Enter Memo:
    <div class="row">
        <div class="col-12">
            @Html.TextAreaFor(model => model.Comment)
        </div>
    </div>

Answer 2

您的视图类型为 BillingCodeList，但您正尝试将 List<BillingCodeObj> 发送给您在控制器中的操作。

尝试如下改变动作：

[HttpPost]
    public void SubmitTimesheet(BillingCodeList model)
    {

        string uri = "";

        foreach (var billingCode in model.BillingCodes)
        {
           //do stuff with each of these
        }
    }

Answer 3

编辑：在将模型发送到视图之前，您似乎没有将 BillingCodeList 的列表元素初始化为 new List<BillingCode>()。还是你？