c＃Linq查询按组分组项目然后分组

Question

问题：我有一个项目列表，我需要先对其进行分组，然后按其产品组中的项目数进行子分组。下面的代码。 objective 用于创建匹配组，其中每个匹配的区域和可用产品。区域和产品可能会发生变化，但应始终对可用产品的数量进行分组。

例如。鉴于以下...

结果应该是...

Group 1
Zone = "EAST", Product = "Bananas", ShippingTime = "3_Days" };
Zone = "EAST", Product = "Oranges", ShippingTime = "5_Days" };
Zone = "SOUTH", Product = "Bananas", ShippingTime = "3_Days" };
Zone = "SOUTH", Product = "Oranges", ShippingTime = "10_Days" };

第 2 组

Zone = "WEST", Product = "Oranges", ShippingTime = "3_Days" };
Zone = "WEST", Product = "Oranges", ShippingTime = "5_Days" };
Zone = "WEST", Product = "Oranges", ShippingTime = "10_Days" };
Zone = "WEST", Product = "Apples", ShippingTime = "3_Days" };
Zone = "WEST", Product = "Apples", ShippingTime = "5_Days" };
Zone = "WEST", Product = "Apples", ShippingTime = "5_Days" };
Zone = "WEST", Product = "Bananas", ShippingTime = "3_Days" };
Zone = "WEST", Product = "Bananas", ShippingTime = "5_Days" };
Zone = "WEST", Product = "Bananas", ShippingTime = "5_Days" };

理想的分组是从第 2 组中拆分出以下内容（因为它们与第 1 组中的内容相匹配）并添加到第 1 组，因此将残差留在第 2 组中。

Zone = "WEST", Product = "Bananas", ShippingTime = "3_Days" };
Zone = "WEST", Product = "Oranges", ShippingTime = "10_Days" };

这是我一直在使用的测试。我用 linq 所做的一切似乎都无法完成。提前感谢您的想法。

public void should_group_products_and_shippingtimes()
        {
            {
                Bananas = "Limited DR";
                var a = new MyClass { Id = 1, Zone = "EAST", Product = "Bananas", ShippingTime = "3_Days" };
                var b = new MyClass { Id = 2, Zone = "EAST", Product = "Oranges", ShippingTime = "5_Days" };
                var c = new MyClass { Id = 3, Zone = "SOUTH", Product = "Bananas", ShippingTime = "3_Days" };
                var d = new MyClass { Id = 4, Zone = "SOUTH", Product = "Oranges", ShippingTime = "10_Days" };
                var e = new MyClass { Id = 5, Zone = "WEST", Product = "Oranges", ShippingTime = "3_Days" };
                var f = new MyClass { Id = 6, Zone = "WEST", Product = "Oranges", ShippingTime = "5_Days" };
                var g = new MyClass { Id = 7, Zone = "WEST", Product = "Oranges", ShippingTime = "10_Days" };
                var h = new MyClass { Id = 8, Zone = "WEST", Product = "Apples", ShippingTime = "3_Days" };
                var i = new MyClass { Id = 9, Zone = "WEST", Product = "Apples", ShippingTime = "5_Days" };
                var j = new MyClass { Id = 10, Zone = "WEST", Product = "Apples", ShippingTime = "5_Days" };
                var k = new MyClass { Id = 11, Zone = "WEST", Product = "Bananas", ShippingTime = "3_Days" };
                var l = new MyClass { Id = 12, Zone = "WEST", Product = "Bananas", ShippingTime = "5_Days" };
                var m = new MyClass { Id = 13, Zone = "WEST", Product = "Bananas", ShippingTime = "5_Days" };
                var myList = new List<MyClass>();
                myList.AddRange(new[] {a,b,c,d,e,f,g,h,i,j,k,l,m});

                var sublist = (from ee in myList
                                                from ff in myList
                                                where ee.Product == ff.Product
                                                      && ee.Id != ff.Id
                                                select ee).Distinct();

                var match1 =
                       myList.AsEnumerable().GroupBy(
                           record =>
                           new { PRODUCT = record.Product, SHIPPINGTIME = record.ShippingTime }).Where(z => z.Count() == 1);

                var match2 =
                       myList.AsEnumerable().GroupBy(
                           record =>
                           new { PRODUCT = record.Product, SHIPPINGTIME = record.ShippingTime }).Where(z => z.Count() == 2);

                var match3 =
                       myList.AsEnumerable().GroupBy(
                           record =>
                           new { PRODUCT = record.Product, SHIPPINGTIME = record.ShippingTime }).Where(z => z.Count() == 3);

                var match4 =
                       myList.AsEnumerable().GroupBy(
                           record =>
                           new { PRODUCT = record.Product, SHIPPINGTIME = record.ShippingTime }).Where(z => z.Count() == 4);

                var match5 =
                       myList.AsEnumerable().GroupBy(
                           record =>
                           new { PRODUCT = record.Product, SHIPPINGTIME = record.ShippingTime }).Where(z => z.Count() == 5);

                // Get the total from each of these group where they match, throw the rest out.


                foreach (var entry in sublist)
                {
                    Console.WriteLine(entry);

                }

                Assert.That(sublist, Is.Not.Null);
            }
        }

//支持Class

public class MyClass
    {
        public int Id { get; set; }
        public string Zone { get; set; }
        public string Product { get; set; }
        public string ShippingTime { get; set; }
    }

Answer 1

我不确定我是否理解你的意思，但我认为你想做这样的事情：

myList.Select(record => record.Product)
      .Distinct()
      .Select(p => new 
              { 
                  Product = p, 
                  Zones = myList.Where(r => r.Product == p)
                                .Select(r => r.Zone)
                                .Distinct() 
              })
      .GroupBy(an => an.Zones.Count())

c＃Linq查询按组分组项目然后分组

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