如何在MVC页面上显示来自多个表的数据

如何在MVC页面上显示多个表的数据?

我的模型:

这是页面模型

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; }
    }

这是内容模型

 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; }
    }

这个注释模型

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; }
        }

我写了下面的

但是在注册注释

时给出错误消息

错误信息:没有为这个对象定义无参数构造函数

@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>
}

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