我已经在过去很好地向MVC动作发布了一个对象列表，但我不确定为什么我会在这种情况下获得null结果。
我创建了一个自定义视图模型：
public class CustomPmScheduleGenerator
{
public bool Save { get; set; }
public bool Search { get; set; }
public DateTime? BegDueDate { get; set; }
public DateTime? EndDateDate { get; set; }
public string GenSn { get; set; }
public string PmName { get; set; }
public string Type { get; set; }
public IList<stp_GetPmSchedulesGenerator_Result> Pms { get; set; }
public IList<stp_GetRepairSchedulesGenerator_Result> Repairs { get; set; }
}
以上对象是我发布到索引操作的内容。 Pms和Repairs都返回null。
这是我的行动（GET和POST）：
[HttpGet]
public ActionResult Index()
{
var model = new CustomPmScheduleGenerator();
var pms = _db.stp_GetPmSchedulesGenerator(null, null, Convert.ToInt32(Session["CustomerNumber"]), null, null).ToList();
var repairs = _db.stp_GetRepairSchedulesGenerator(null, null, Convert.ToInt32(Session["CustomerNumber"]), null, null).ToList();
model.Pms = pms;
model.Repairs = repairs;
return View(model);
}
[HttpPost]
public ActionResult Index(CustomPmScheduleGenerator model)
{
if (model.Save)
{
//Update the PMs
foreach (var pm in model.Pms)
{
//TODO: Update the current PM
}
//Update the Repairs
foreach (var repair in model.Repairs)
{
//TODO: Update the Current Repair
}
}
else if (model.Search)
{
var pms = _db.stp_GetPmSchedulesGenerator(model.BegDueDate, model.EndDateDate, Convert.ToInt32(Session["CustomerNumber"]),model.PmName, model.GenSn).ToList();
var repairs = _db.stp_GetRepairSchedulesGenerator(null, null, Convert.ToInt32(Session["CustomerNumber"]), null, null).ToList();
model.Pms = pms;
model.Repairs = repairs;
return View(model);
}
return View();
}
我在if语句行的POST操作上设置了一个断点，并检查参数＆＃34; model＆＃34;的值。这就是我看到空值的地方。
以下是我的观点：
@using (Html.BeginForm("Index", "PmScheduleGenerator", FormMethod.Post))
{
<div>
<h1>
<strong>PM Schedule</strong>
@Html.ActionLink("Add Repair", "AddRepair", null, new { @class = "btn btn-warning", @style = "float:right;margin-left:5px;" })
@Html.ActionLink("Save", "AddRepair", null, new { @class = "btn btn-success", @style = "float:right" })
</h1>
</div>
<hr />
<div class="row">
<div class="col-lg-2 form-group">
<div class="editor-label">
@Html.Label("Due Beg. Date")
</div>
<div class="editor-field">
<div class="input-group date">
@Html.TextBoxFor(model => model.BegDueDate, null, new { @class = "form-control" })
<span class="input-group-addon"><i class="glyphicon glyphicon-th"></i></span>
</div>
</div>
</div>
<div class="col-lg-2 form-group">
<div class="editor-label">
@Html.Label("Due End Date")
</div>
<div class="editor-field">
<div class="input-group date">
@Html.TextBoxFor(model => model.EndDateDate, null, new { @class = "form-control" })
<span class="input-group-addon"><i class="glyphicon glyphicon-th"></i></span>
</div>
</div>
</div>
<div class="col-lg-2 form-group">
<div class="editor-label">
@Html.Label("Gen S/N")
</div>
<div class="editor-field">
<div class="input-group">
@Html.DropDownListFor(model => model.GenSn, DropdownLists.GetGenSns(Convert.ToInt32(Session["CustomerNumber"]), Session["PmType"].ToString(), Session["Whse"].ToString()), new { @class = "form-control" })
</div>
</div>
</div>
<div class="col-lg-2 form-group">
<div class="editor-label">
@Html.Label("PM Name")
</div>
<div class="editor-field">
<div class="input-group">
@Html.DropDownListFor(model => model.PmName, DropdownLists.GetPmNames(Convert.ToInt32(Session["CustomerNumber"]), Session["PmType"].ToString(), Session["Whse"].ToString()), new { @class = "form-control" })
</div>
</div>
</div>
<div class="col-lg-2 form-group">
<div class="editor-label">
@Html.Label("Type")
</div>
<div class="editor-field">
<div class="input-group">
@Html.DropDownListFor(model => model.Type, DropdownLists.GetTypes(), new { @class = "form-control" })
</div>
</div>
</div>
<div class="col-lg-2 form-group">
<div class="editor-label">
</div>
<div class="editor-field">
<input type="submit" value="Search" class="btn btn-success" />
<input type="submit" value="Clear" class="btn btn-danger" />
</div>
</div>
</div>
<table class="table table-striped table-bordered">
<thead>
<tr>
<th>Gen S/N</th>
<th>Loc ID</th>
<th style="width: 140px;">PM Description</th>
<th>City</th>
<th>Next PM Due Dt.</th>
<th>Sched Arrival Dt.</th>
<th style="width: 160px;">Actions</th>
</tr>
</thead>
<tbody>
@for (var i = 0; i < Model.Pms.Count; i++)
{
<tr>
<td>
@Html.HiddenFor(x => x.Pms[i].FleetTruckNo)
@Html.DisplayFor(x => x.Pms[i].FleetTruckNo)
</td>
<td>
@Html.HiddenFor(x => x.Pms[i].LocationID)
@Html.DisplayFor(x => x.Pms[i].LocationID)
</td>
<td>
@Html.HiddenFor(x => x.Pms[i].Description)
@Html.DisplayFor(x => x.Pms[i].Description)
</td>
<td>
@Html.HiddenFor(x => x.Pms[i].City)
@Html.DisplayFor(x => x.Pms[i].City)
</td>
<td>
<div class="editor-field">
<div class="input-group date">
@Html.TextBoxFor(x => x.Pms[i].NextPMDueDt, "{0:MM/dd/yyyy}", new { @class = "form-control" })
<span class="input-group-addon"><i class="glyphicon glyphicon-th"></i></span>
</div>
</div>
</td>
<td>
<div class="editor-field">
<div class="input-group date">
@Html.TextBoxFor(x => x.Pms[i].EstArrivalDt, "{0:MM/dd/yyyy}", new { @class = "form-control" })
<span class="input-group-addon"><i class="glyphicon glyphicon-th"></i></span>
</div>
</div>
</td>
<td>
<input type="hidden" class="query" value="?customerNumber=@Model.Pms[i].CustNo&fleetTruckNo=@Model.Pms[i].FleetTruckNo&sro=@Model.Pms[i].RepairOrdNo&scheduleId=@Model.Pms[i].ScheduleID" />
<input type="button" class="comments btn btn-primary" value="Comments" />
<input type="button" class="btn btn-success" value="Process" />
</td>
</tr>
}
@for (var i = 0; i < Model.Repairs.Count; i++)
{
<tr>
<td>
@Html.HiddenFor(x => x.Repairs[i].FleetTruckNo)
@Html.DisplayFor(x => x.Repairs[i].FleetTruckNo)
</td>
<td>
@Html.HiddenFor(x => x.Repairs[i].LocationID)
@Html.DisplayFor(x => x.Repairs[i].LocationID)
</td>
<td>
@Html.HiddenFor(x => x.Repairs[i].Description)
@Html.DisplayFor(x => x.Repairs[i].Description)
</td>
<td>
@Html.HiddenFor(x => x.Repairs[i].City)
@Html.DisplayFor(x => x.Repairs[i].City)
</td>
<td>
N/A
</td>
<td>
<div class="editor-field">
<div class="input-group date">
@Html.TextBoxFor(x => x.Repairs[i].ScheduledDt, "{0:MM/dd/yyyy}", new { @class = "form-control" })
<span class="input-group-addon"><i class="glyphicon glyphicon-th"></i></span>
</div>
</div>
</td>
<td>
<input type="hidden" class="query" value="?customerNumber=@Model.Repairs[i].CustNo&fleetTruckNo=@Model.Repairs[i].FleetTruckNo&sro=@Model.Repairs[i].SRO&scheduleId=@Model.Repairs[i].ScheduleID&repair=true" />
<input type="button" class="comments btn btn-primary" value="Comments" />
<input type="button" class="btn btn-success" value="Process" />
</td>
</tr>
}
</tbody>
</table>
}
正如你在视图中看到的那样，我有两个for循环去抛修和PM。有谁知道为什么我在POST动作中获得空值？
答案 0 :(得分：1)
将此添加到模型构造函数中，看看它是否有帮助。
public class CustomPmScheduleGenerator
{
public CustomPmScheduleGenerator()
{
Pms = new List<stp_GetPmSchedulesGenerator_Result>();
Repairs = new List<stp_GetRepairSchedulesGenerator_Result>();
}
public bool Save { get; set; }
etc..
public IList<stp_GetPmSchedulesGenerator_Result> Pms { get; set; }
public IList<stp_GetRepairSchedulesGenerator_Result> Repairs { get; set; }
}
模型绑定器可以创建模型的新实例，但Pms和Repairs对象为null，除非在构造函数中实例化它们
答案 1 :(得分：-1)
将 for 置于 if 语句
下Task<ServiceStatus>.FromResult(null)