Question

更新，我添加了一张图片以显示返回的内容我正在尝试创建一个显示类别和制造商的菜单（可以从中获取数据），但无法从GroupBy的列表中获取产品。

我的代码是：

IEnumerable<IPublishedContent> getAllProducts = UmbracoAssignedContentHelper.PageContentByAlias("productCatalog").Children;

var result = getAllProducts.GroupBy(x => new { Manufacturer = x.GetPropertyValue<string>("manufacturer"), Category = x.GetPropertyValue<string>("category")})
    .Select(b => new ProductsGroupByTypeViewModel
    {
        GetAllProductsGroupByType   = b.Select(bn => bn.GetPropertyValue<IEnumerable<string>>("product").ToList()),
        Category                    = b.Key.Category,
        Manufacturer                = b.Key.Manufacturer

    }).ToList();

var listOfProducts = result.ToList();

查看模型

public IEnumerable<List<string>> GetAllProductsGroupByType { get; set; }
public string Category { get; set; }
public string Manufacturer { get; set; }

我最后一次尝试是

<ul>
    @foreach (var data in Model)
    {
        <li>@data.GetAllProductsGroupByType</li> <---------What do I need to do here
    }
</ul>

显示

System.Linq.Enumerable + WhereSelectEnumerableIterator 2[Umbraco.Core.Models.IPublishedContent,System.Collections.Generic.List 1 [System.String]] System.Linq.Enumerable + WhereSelectEnumerableIterator 2[Umbraco.Core.Models.IPublishedContent,System.Collections.Generic.List 1 [System.String]]

如何向下钻取并显示产品数据？

任何帮助将不胜感激

至于Eldho的答案，我已经尝试过了，但是没有用。我得到了错误。

异常详细信息：System.ArgumentNullException：值不能为null。来自GetAllProductsGroupByType = b.Select(bn => bn.GetPropertyValue<IEnumerable<string>>("product").ToList()),

Answer 1

我认为您不能按分组方式进行选择。也许下面的代码段工作

IEnumerable<IPublishedContent> getAllProducts = UmbracoAssignedContentHelper.PageContentByAlias("productCatalog").Children;

var result = getAllProducts.GroupBy(x => new { Manufacturer = x.GetPropertyValue<string>("manufacturer"), Category = x.GetPropertyValue<string>("category")})
    .Select(b => new ProductsGroupByTypeViewModel
    {
        GetAllProductsGroupByType   = new List<string>(),
        Category                    = b.Key.Category,
        Manufacturer                = b.Key.Manufacturer

    }).ToList();

froeach(var item in result)
{
    item.GetAllProductsGroupByType = getAllProducts.Where(en => en.manufacturer == item.Manufacturer && en.category == item.Category).Select(en => en.product).ToList();
}

//now you can use result as your answer

Answer 2

尝试这样

IEnumerable<IPublishedContent> getAllProducts = UmbracoAssignedContentHelper.PageContentByAlias("productCatalog").Children;

var result = getAllProducts.GroupBy(x => new { Manufacturer = x.GetPropertyValue<string>("manufacturer"), Category = x.GetPropertyValue<string>("category")})
    .Select(b => new ProductsGroupByTypeViewModel
    {
        GetAllProductsGroupByType   = b.Select(bn => bn.GetPropertyValue<List<string>>("product")),
        Category                    = b.Key.Category,
        Manufacturer                = b.Key.Manufacturer

    }).ToList();

var listOfProducts = result.ToList();

数据模型

public List<List<string>> GetAllProductsGroupByType { get; set; }
public string Category { get; set; }
public string Manufacturer { get; set; }

查看

@foreach (var data in Model)
{
    if(data.GetAllProductsGroupByType != null || data.GetAllProductsGroupByType.Count == 0)
    {
        continue;
    }

    foreach(var item in data.GetAllProductsGroupByType)
    {
       <li>item</li>
    }
}

Linq Group通过显示列表中的详细信息

2 个答案: