查看代码:
@using HRHPMVS.Models
@model HRHPMVS.ViewModel.NationalityVM
@{
ViewBag.Title = "list";
//Layout = "~/Views/Shared/OrangeHR.cshtml";
Layout = null;
}
<h1>Details</h1>
<div>
<h1>Details</h1>
<div>
@if (Model.NationalitiesList != null)
{
foreach (var item in Model.NationalitiesList)
{
@Html.DisplayFor(m => item.Code)
}
}
</div>
</div>
控制器代码:
public ActionResult list()
{
ModelState.Clear();
NationRepObj.list();
return View();
}
模型:
namespace HRHPMVS.Models
{
public class Nationality
{
public int ID { get; set; }
[Display(Name = "Name")]
[Required(ErrorMessage = "Name is Requirde")]
[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "please: Use letters only ")]
public string Name { get; set; }
[Display(Name = "Code")]
[Required(ErrorMessage = "Code is Requirde")]
[RegularExpression(@"[0-9]*\.?[0-9]+", ErrorMessage = "{0} must be a Number.")]
[Range(0, int.MaxValue, ErrorMessage = "Please: enter valid integer Number")]
public int Code { get; set; }
public Nullable<short> IsActive { get; set; }
// ...
}
}
视图模型:
namespace HRHPMVS.ViewModel
{
public class NationalityVM
{
public Nationality Nationality { get; set; }
public List<Nationality> NationalitiesList { get; set; }
// ...
}
}
viewmodellist:
namespace HRHPMVS.ViewModel
{
public class NationalityVMList
{
public List<NationalityVM> Nationalities {get;set;}
// ...
}
}
功能:
public void list()
{
List<Nationality> n = new List<Nationality>();
Nationality nt = new Nationality { Code=1,Name="doodoo",ID=1,IsActive=1};
NationalityVM vm = new NationalityVM ();
List<NationalityVM> l1 = new List<NationalityVM>();
// foreach(var itm in nt)
n.Add(nt);
if (vm.NationalitiesList == null)
{
vm.NationalitiesList = new List<Nationality>();
vm.NationalitiesList.Add(nt);
}
}
我试图在一个视图中查看详细的国籍。我想从listviewmodel查看它,但我失败了。我创建了viewmodel列表点以查看模型并查看模型指向模型,但是当我尝试将列表中的国籍添加到返回null值且错误为Null reference exception wasn't handled in user code
时。
我想在viewmodel列表中显示国籍详情
答案 0 :(得分:0)
此代码存在一些问题,很难知道您要实现的目标。
你有一个名为“viewmodellist”的类叫做CountriesVMList。我不相信这有目的。也许删除它。
您的视图需要一个类型为CountriesVM的模型,但您的控制器操作不会传递任何内容。
您的“函数”会创建一个列表以及几个未使用的变量,并且不返回任何内容。
更改控制器,以便将模型传递给视图:
public ActionResult list()
{
NationalityVM model = NationRepObj.GetNationalityVM();
ModelState.Clear();
return View(model);
}
将您的功能更改为:
public NationalityVM GetNationalityVM()
{
NationalityVM vm = new NationalityVM();
Nationality nt = new Nationality { Code=1,Name="doodoo",ID=1,IsActive=1};
vm.NationalitiesList = new List<Nationality>();
vm.Add(nt);
return vm;
}
希望这会有所帮助。