asp.Net MVC视图模型是空的后 [英] asp.Net MVC view model is empty on post
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问题描述
我有我传递到视图创建一个复杂的视图模型。当我在网页上输入数据，并张贴模式是空的。无论是在子对象和测试字段的字段是空的。为什么呢？
公共类ContactIncident
{
[键]
公众诠释标识{搞定;组; } [数据类型（DataType.MultilineText）
公共字符串描述{搞定;组; } [显示（NAME =事故日期）]
[数据类型（DataType.Date）
公众的DateTime？ IncidentDateTime {搞定;组; } [显示（名称=跟进日）]
[DisplayFormat（ApplyFormatInEditMode = TRUE，DataFormatString ={0：DD / MM / YYYY}）]
[数据类型（DataType.Date）
公众的DateTime？ FollowUpDate {搞定;组; }
}公共类IncidentManager
{
公共ContactIncident事件{搞定;组; }
公共字符串测试{搞定;组; }
}
公众的ActionResult创建（INT？ID）
{
IncidentManager IM =新IncidentManager（）;
ContactIncident CI =新ContactIncident（）;
ci.IncidentDateTime = DateTime.Now;
ci.FollowUpDate = DateTime.Now.AddDays（14）;
im.Incident = Cl;
返回查看（IM）;
}[HttpPost]
[ValidateAntiForgeryToken]
公众的ActionResult创建（IncidentManager IM）
{
如果（ModelState.IsValid）
{
ContactIncident CI =新ContactIncident（）;
ci.IncidentDateTime = incident.Incident.IncidentDateTime;
ci.Description = im.Incident.Description;
返回RedirectToAction（「指数」）;
}
返回查看（事件）;
}
查看：
@model MyApp.Web.ViewModels.IncidentManager
@ {
ViewBag.Title =编辑事件;
}
＆LT; H4＆GT; @ ViewBag.Title＆LT; / H4＆GT;
@using（Html.BeginForm（））
{
@ Html.AntiForgeryToken（）
＆LT; DIV CLASS =的形式，水平井＆GT;
@ Html.ValidationSummary（真）
@ Html.EditorFor（型号=＆GT; model.Test）
＆LT; DIV CLASS =行＆GT;
＆LT; DIV CLASS =COL-MD-2＆GT;
@ Html.LabelFor（型号=＆GT; model.Incident.IncidentDateTime）
＆LT; / DIV＆GT;
＆LT; DIV CLASS =COL-MD-2＆GT;
@ Html.DisplayFor（型号=＆GT; model.Incident.IncidentDateTime）
＆LT; / DIV＆GT;
＆LT; / DIV＆GT;
＆LT; DIV CLASS =行＆GT;
＆LT; DIV CLASS =COL-MD-2＆GT;
@ Html.LabelFor（型号=＆GT; model.Incident.Description）
＆LT; / DIV＆GT;
＆LT; DIV CLASS =COL-MD-10＆GT;
@ Html.EditorFor（型号=＆GT; model.Incident.Description，新{htmlAttributes = {新@class =表格控，行=10}}）
＆LT; / DIV＆GT;
＆LT; DIV CLASS =COL-MD-2＆GT;
@ Html.LabelFor（型号=＆GT; model.Incident.FollowUpDate）
＆LT; / DIV＆GT;
＆LT; DIV CLASS =COL-MD-2＆GT;
@ Html.EditorFor（型号=＆GT; model.Incident.FollowUpDate，新{htmlAttributes = {新@class =表格控}，}）
＆LT; / DIV＆GT;
＆LT; / DIV＆GT;
＆LT; / DIV＆GT;
＆LT; DIV CLASS =表单组＆GT;
＆LT; DIV CLASS =COL-MD-偏移2 COL-MD-10＆GT;
＆LT;输入类型=提交值=保存级=BTN BTN-默认的/＆GT;
＆LT; / DIV＆GT;
＆LT; / DIV＆GT;
}
解决方案
的问题是，的 DefaultModelBinder 将不能，如果你使用不同的参数名称嵌套模型正确映射。您必须使用相同的参数名称作为视图模型的名称。
公众的ActionResult创建（IncidentManager incidentManager）
作为一般的做法，始终使用名称的模型作为参数名称，以避免映射问题。
更新：
该DefaultModelBinder使用公约为本的映射。
IncidentManager.Incident = incidentManager.Incident（将映射）
IncidentManager.Incident = im.Incident（不会因为地图'聊天室'！='incidentManager'）
I have a complex view model that I am passing to a create view. When I enter data on the page and post it the model is empty. Both the fields in the sub-object and the "test" field are empty. Why?
public class ContactIncident
{
[Key]
public int Id { get; set; }
[DataType(DataType.MultilineText)]
public string Description { get; set; }
[Display(Name = "Incident Date")]
[DataType(DataType.Date)]
public DateTime? IncidentDateTime { get; set; }
[Display(Name = "Follow Up Date")]
[DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:dd/MM/yyyy}")]
[DataType(DataType.Date)]
public DateTime? FollowUpDate { get; set; }
}
public class IncidentManager
{
public ContactIncident Incident { get; set; }
public string Test { get; set; }
}
public ActionResult Create(int? id)
{
IncidentManager im = new IncidentManager();
ContactIncident ci = new ContactIncident();
ci.IncidentDateTime = DateTime.Now;
ci.FollowUpDate = DateTime.Now.AddDays(14);
im.Incident = ci;
return View(im);
}
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(IncidentManager im)
{
if (ModelState.IsValid)
{
ContactIncident ci = new ContactIncident();
ci.IncidentDateTime = incident.Incident.IncidentDateTime;
ci.Description = im.Incident.Description;
return RedirectToAction("Index");
}
return View(incident);
}
View:
@model MyApp.Web.ViewModels.IncidentManager
@{
ViewBag.Title = "Edit Incident";
}
<h4>@ViewBag.Title</h4>
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
<div class="form-horizontal well">
@Html.ValidationSummary(true)
@Html.EditorFor(model=>model.Test)
<div class="row">
<div class="col-md-2">
@Html.LabelFor(model => model.Incident.IncidentDateTime)
</div>
<div class="col-md-2">
@Html.DisplayFor(model => model.Incident.IncidentDateTime)
</div>
</div>
<div class="row">
<div class="col-md-2">
@Html.LabelFor(model => model.Incident.Description)
</div>
<div class="col-md-10">
@Html.EditorFor(model => model.Incident.Description, new { htmlAttributes = new { @class = "form-control", rows = "5" }, })
</div>
<div class="col-md-2">
@Html.LabelFor(model => model.Incident.FollowUpDate)
</div>
<div class="col-md-2">
@Html.EditorFor(model => model.Incident.FollowUpDate, new { htmlAttributes = new { @class = "form-control"}, })
</div>
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Save" class="btn btn-default" />
</div>
</div>
}
解决方案
The problem is that the DefaultModelBinder won't be able to map nested models properly if you use a different parameter name. You must use the same parameter name as the ViewModel name.
public ActionResult Create(IncidentManager incidentManager)
As a general practice, always use the name of the model as the parameter name to avoid mapping problems.
UPDATE:
The DefaultModelBinder uses "convention based" mapping.
IncidentManager.Incident = incidentManager.Incident (will map)
IncidentManager.Incident = im.Incident (won't map because 'im' != 'incidentManager')
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