Question

Series对象包含一个名为Skus的属性，它是IEnumerable 如果这个sku在允许的skus列表中，那么我需要那个系列。

在下面的例子中，我加入了s.SeriesId，这是不正确的。我相信它必须是s.Skus的集合我只想返回一个在集合中包含sku的系列。

        IEnumerable<Data.Models.Series> series = await _seriesRepository.GetSeriesAsync(Properties.Settings.Default.Channel, page, limit);
        string[] skusInSeries = series?.SelectMany(x => x.Skus).Distinct().ToArray();

        IEnumerable<string> itemNumbers = GetAllowedSkus(Customer, Shipto, EnvironmentCode, AcceptLanguage, skusInSeries, Warehouse);


        var selected = from s in series
                       join i in itemNumbers
                       on s.SeriesId equals i     //s.Skus  IEnumerable<string>
                       select s;

Answer 1

var selected = from s in series
               where itemNumbers.Any(i => s.Skus.Contains(i))
               select s;

或者另一种方式：

var selected = from s in series
               where s.Skus.Any(sku => itemNumbers.Contains(sku))
               select s;

我猜通常会有Skus多于itemNumbers，而第一选择更好。将itemNumbers更改为可以传递给数据库的列表也可能更好：

var itemNumbers = GetAllowedSkus(Customer, Shipto, EnvironmentCode, AcceptLanguage, skusInSeries, Warehouse).ToList();
var selected = from s in series
               where itemNumbers.Any(i => s.Skus.Contains(i))
               select s;

如果不涉及SQL（或其他）数据库，您可以将itemNumbers转换为HashSet以进行有效查找：

var itemNumbers = new HashSet<string>(GetAllowedSkus(Customer, Shipto, EnvironmentCode, AcceptLanguage, skusInSeries, Warehouse));

var selected = from s in series
               where s.Skus.Any(sku => itemNumbers.Contains(sku))
               select s;

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1 个答案: