[英]Multiple ViewModels in View asp.net MVC
我是asp.net mvc的新手,而viewmodels对我也是新的。 我有一个显示产品的视图。 在视图中,我想在一格中显示所有产品。 然后在另一个div中,我只想显示FeaturedProducts,在另一个div中,则显示Toprated。 我试图为每个视图使用不同的视图模型,因为我将在不同的页面上再次使用它们。 这是执行此操作的正确方法吗(如果不是)。 另外,我该如何仅针对练习使用viewmodels执行此操作。
领域模型
public class Product
{
public int ProductId { get; set; }
public string SKU { get; set; }
public string Name { get; set; }
public string Title { get; set; }
public string Description { get; set; }
public Boolean FeaturedProduct { get; set; }
public Boolean NewProduct { get; set; }
public Boolean TopRated { get; set; }
public Boolean BestSellers { get; set; }
}
ViewModelProductsMain(父级)
public class ViewModelProductsMain
{
public ViewModelProducts Products{ get; set; }
public ViewModelTopRated TopRated{ get; set; }
public ViewModelFeatured Featured{ get; set; }
}
ViewModels(儿童)
public class ViewModelProducts (Child)
//all products
{
public int ProductId { get; set; }
public string SKU { get; set; }
public string Name { get; set; }
public string Title { get; set; }
public string Description { get; set; }
}
public class ViewModelTopRated (Child)
//all products with TopRated true
{
public int ProductId { get; set; }
public string SKU { get; set; }
public string Name { get; set; }
public string Title { get; set; }
public string Description { get; set; }
}
public class ViewModelFeatured (Child)
//all products with Featured true
{
public int ProductId { get; set; }
public string SKU { get; set; }
public string Name { get; set; }
public string Title { get; set; }
public string Description { get; set; }
}
调节器
public ActionResult Index()
{
//How do I, instantiate and populate the model
var model = new ViewModelProductsMain ();
return View(model);
}
视图
@model IEnumerable<myProject.ViewModels.ViewModelProductsMain >
首先,您应该将ViewModelProductsMain更改为此:
public class ViewModelProductsMain
{
public List<ViewModelProducts> Products { get; set; }
public List<ViewModelTopRated> TopRated { get; set; }
public List<ViewModelFeatured> Featured { get; set; }
}
为了在视图中显示您的产品,应编写以下代码:
@model WebApplication1.Models.ViewModelProductsMain
@{
ViewBag.Title = "Index";
}
<div id="AllProducts">
@foreach (var item in Model.Products.ToList())
{
@item.Name
<hr/>
}
</div>
<div id="TopRated">
@foreach (var item in Model.TopRated.ToList())
{
@item.Name
<hr />
}
</div>
<div id="Featured">
@foreach (var item in Model.TopRated.ToList())
{
@item.Name
<hr />
}
</div>
我看到public int ProductId { 组; }在您的所有模型中。 似乎您的数据中有些像外键的想法,因此您可以使您的视图模型比我们在ViewModelProductsMain中看到的更好。
所以:
public class Product
{
public int ProductId { get; set; }
public string SKU { get; set; }
public string Name { get; set; }
public string Title { get; set; }
public string Description { get; set; }
}
public class ViewModelProducts {
public virtual List<Product> Products { get; set; }
}
做您在顶部看到的ViewModelFeatured
和ViewModelTopRated
到
然后:
public class ViewModelProductsMain
{
public ViewModelProductsMain()
{
this.Products = new List<ViewModelProducts>();
this.TopRated = new List<ViewModelTopRated>();
this.Featured = new List<ViewModelFeatured>();
}
public List<ViewModelProducts> Products { get; set; }
public List<ViewModelTopRated> TopRated { get; set; }
public List<ViewModelFeatured> Featured { get; set; }
}
不要忘了写一个构造你的ViewModelProductsMain,如果你不使构造..它带来的null reference error
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