Come posso visualizzare i dati da più tabelle su una pagina in MVC?

Question

Come si visualizzano i dati da più tabelle su una pagina in MVC?

I miei modelli:

Questa la pagina modello

public class PageModel 
    { 
     [Key] 
     [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] 
     public int PageId { get; set; } 

     public string PageTitle { get; set; } 

     public string PageSubject { get; set; } 

     public DateTime CreateDate { get; set; } 

     public DateTime UpdateDate { get; set; } 

     public int ParentId { get; set; } 

     public bool IsActive { get; set; } 

     public IList<PageContentModel> PageContentModels { get; set; } 
     public IList<CommentModel> CommentModels { get; set; } 
    } 

Questo è il modello di contenuto

public class PageContentModel 
    { 
     [Key] 
     [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] 
     public int ContentId { get; set; } 

     public int PageId { get; set; } 
     public virtual PageModel PageModel { get; set; } 

     [Required] 
     [DataType(DataType.MultilineText)] 
     [MaxLength(1024)] 
     public string Content { get; set; } 
    } 

Questo commento modello

public class CommentModel 
     { 
      [Key] 
      [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] 
      public int CommentId { get; set; } 

      public string CommentAuthor { get; set; } 

      public string CommentContent { get; set; } 

      public DateTime CreateDate { get; set; } 

      public bool IsActive { get; set; } 

      public int PageId { get; set; } 
      public virtual PageModel PageModel { get; set; } 
     } 

ho scritto il seguente

Ma dà un messaggio di errore quando si registra un commento

Messaggio di errore: Nessun costruttore senza parametri definiti per questo oggetto

@model Tuple<DynamicWebsite.Models.PageModel, DynamicWebsite.Models.CommentModel> 
@helper GetParentTitle(int id) 
{ 
    if (id != 0) 
    { 
     DynamicWebsite.DataLayer.EFDbContext x = new DynamicWebsite.DataLayer.EFDbContext(); 
     var item = x.PageModels.Find(id); 
     x.Dispose(); 
    @GetParentTitle(item.ParentId); 
    <span>| </span><a href="@item.PageId">@item.PageTitle</a> 

    } 
    else 
    { 
    @Html.ActionLink("Home", "Index", "Home")} 
} 
@GetParentTitle(Model.Item1.PageId) 
@if (Model.Item1.IsActive) 
{ 

    ViewBag.Title = Model.Item1.PageTitle; 

    <fieldset> 
     <legend>PageModel</legend> 

     <div class="display-label"> 
      Page Subject:<h2>@Model.Item1.PageSubject</h2> 
     </div> 
     <p> 
      @foreach (var item in Model.Item1.PageContentModels) 
      { 
       @item.Content 
      } 
     </p> 
     @if (Model.Item1.UpdateDate > Model.Item1.CreateDate) 
     { 
      <h5>Create Date: @String.Format("{0:g}", Model.Item1.CreateDate)</h5> 
      <h5>UpdateDate: @String.Format("{0:g}", Model.Item1.UpdateDate)</h5> 
     } 
     else 
     { 
      <h5>Create Date: @String.Format("{0:g}", Model.Item1.CreateDate)</h5> 
     } 
     @foreach (var item in Model.Item1.CommentModels) 
     { 
      if (item.IsActive) 
      { 
      <h3>@item.CommentAuthor said:</h3> 
      <p>@item.CommentContent</p> 
      <h5>Create Date: @String.Format("{0:g}", item.CreateDate)</h5> 
      } 
     } 
    </fieldset> 

    using (Html.BeginForm()) 
    { 
    @Html.ValidationSummary(true) 
    <fieldset> 
     <legend>CommentModel</legend> 
      <div class="editor-label"> 
       @Html.LabelFor(model => model.Item2.CommentAuthor) 
      </div> 
      <div class="editor-field"> 
       @Html.EditorFor(model => model.Item2.CommentAuthor) 
       @Html.ValidationMessageFor(model => model.Item2.CommentAuthor) 
      </div> 

      <div class="editor-label"> 
       @Html.LabelFor(model => model.Item2.CommentContent) 
      </div> 
      <div class="editor-field"> 
       @Html.EditorFor(model => model.Item2.CommentContent) 
       @Html.ValidationMessageFor(model => model.Item2.CommentContent) 
      </div> 
     <p> 
      <input type="submit" value="Create" /> 
     </p> 
    </fieldset> 
    } 



} 
else 
{ 
    ViewBag.Title = "Deactive"; 
    <p>This page deactive.</p> 
} 

Answer 1

Creare un nuovo errore di modello corretto

public class PageViewModel 
    { 
     public PageModel PageModel { set; get; } 
     public CommentModel CommentModel { set; get; } 
    }