【MVC】One View Two Models -- tuple or ViewModel

如果有個View同時需要載入兩個model時可以使用tuple ```html
@model Tuple<IEnumerable<NTI.Models.ExhibitionList>,NTI.Models.ExhibitionList>

**Model**```csharp
public class ExhibitionList 
{
   [Required]
   [MaxLength(50)]
   public string ExhibitionName { get; set; }

   public DateTime CreateDate { get; set; }

   public DateTime EditDate { get; set; }
}

Controller```csharp
public ActionResult ExhibitionList()
{
var tuple = new Tuple<IEnumerable, ExhibitionList>(Repository.GetExhibitionList(), new ExhibitionList());
return PartialView(tuple);
}

**View**```html
if (Model.Item1.Count() == 0)
{
   <tr id="noExhibition">
   <td colspan="4">
   <span class="text-left">沒有建立任何展覽喔....</span>
   </td>
   </tr>     
}
else
{
   foreach (var exhibitionItem in Model.Item1)
   {
      <tr>
      <td>1</td>
      <td>@exhibitionItem.ExhibitionName</td>
      <td>@exhibitionItem.CreateDate</td>
      <td>@exhibitionItem.EditDate</td>
      </tr>
   }
   @Html.TextBoxFor(m => Model.Item2.ExhibitionName)
}

在View中使用Model的方法為：
Model.Item1代表載入的第一個Model
Model.Item2代表載入的第二個Model

第二種方式就是建立一個ViewModel的方式
Model```csharp
/// 展覽列表的ViewModel
public class ExhibitionListViewModel
{
public IEnumerable IEmumerable_ExhibitionList { get; set; }
public ExhibitionList ExhibitionListModel { get; set; }
}

**View**```csharp
public ActionResult ExhibitionList() 
{
   ExhibitionListViewModel model = new ExhibitionListViewModel();
   model.IEmumerable_ExhibitionList = Repository.GetExhibitionList();
   model.ExhibitionListModel = new ExhibitionList();
   return PartialView(model);
}

Controller```csharp
@Html.TextBoxFor(model => model.ExhibitionListModel.ExhibitionName)
@Html.ValidationMessageFor(model => model.ExhibitionListModel.ExhibitionName)

//and ….
if (Model.IEmumerable_ExhibitionList.Count() == 0)
{
//do something
}