c＃Linq查询按组然后按子组对项目进行分组

Question

Question : I have a list of items which I need to first group and then sub group by the number of items in their product group. Code below. The objective is to create matching groups where the zones and the products available in each match. The zone and product are subject to change, but the number products available should always be grouped.

for example. given the below...

Result should be...

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" };

Group 2

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" };

The ideal grouping would be to break out the below from Group 2 (caus' they match what's in group 1) and add to group 1, thus leaving the residual in group 2.

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

Here's the test I've been working with. Nothing I've been able to do with linq seems to get the job done. Thanks in Advance for the ideas.

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);
            }
        } 

// Supporting 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

I'm not sure I understood you right, but I think you want to do something like that:

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())