[英]Display 3 lists as a matrix in C# and MVC 3.0
我有以下3个课程:
public class Product
{
public int ProductId { get; set; }
public int ClassId { get; set; }
public string Name { get; set; }
public virtual Class Class { get; set; }
}
public class Partner
{
public int PartnerId { get; set; }
public int ClassId { get; set; }
public string Name { get; set; }
public virtual Class Class { get; set; }
}
public class Price
{
public int PriceId { get; set; }
public int ClassId { get; set; }
public int ProductId { get; set; }
public int PartnerId { get; set; }
public float Cost { get; set; }
}
我有3个数据列表:
List<Product> products; List<Partner> partners; List<Price> prices;
如何在MVC视图的表格单元格中的顶部行显示合作伙伴,在左列显示产品,并在每个单元格和价格中显示价格(如果适用于每个合作伙伴和产品)?
与往常一样,我将从设计一个将反映视图需求的视图模型开始:
public class MyViewModel
{
public IEnumerable<Product> Products { get; set; }
public IEnumerable<PartnerPricesViewModel> PartnerProductPrices { get; set; }
}
public class PartnerPricesViewModel
{
public string PartnerName { get; set; }
public IEnumerable<Price> Prices { get; set; }
}
然后,我将从我们的域模型的控制器操作中填充此视图模型,并将其传递给视图:
public ActionResult Index()
{
List<Product> products = ...
List<Partner> partners = ...
List<Price> prices = ...
var model = new MyViewModel
{
Products = products,
PartnerProductPrices =
from partner in partners
select new PartnerPricesViewModel
{
PartnerName = partner.Name,
Prices =
from product in products
select prices.FirstOrDefault(price =>
price.PartnerId == partner.PartnerId &&
price.ProductId == product.ProductId
)
}
};
return View(model);
}
最后,我将获得与视图模型相对应的强类型视图:
@model MyViewModel
<table>
<thead>
<tr>
<th></th>
@foreach (var product in Model.Products)
{
<th>@product.Name</th>
}
</tr>
</thead>
<tbody>
@foreach (var partner in Model.PartnerProductPrices)
{
<tr>
<td>@partner.PartnerName</td>
@foreach (var price in partner.Prices)
{
<td>
@if (price != null)
{
@price.Cost.ToString("c")
}
else
{
// There was no price found matching this
// product and partner => we display an empty cell
@:
}
</td>
}
</tr>
}
</tbody>
</table>
您的prices
表对SQL非常友好,但并不完全适合实际问题。 我认为您的价格应该存储在Dictionary<Tuple<Product, Partner>, Price>
而不是List<Price>
。
由于这是MVC,因此我将使用该词典作为视图模型的一部分(以及产品和合作伙伴)。 然后将其显示为表格将非常简单。
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