StackOverflow2013

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PO
primarykey
Id
20552601
data
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0
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2013-12-12T19:36:27.380
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2013-12-12T21:09:22.503
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2013-12-12T21:09:22.503
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779513
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779513
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20552503
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2
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text
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<p>You could use <a href="http://msdn.microsoft.com/en-us/library/bb534743%28v=vs.110%29.aspx" rel="nofollow"><code>ThenBy</code></a> and take the 2nd and 3rd children. But, that is not scalable, so it depends on the needs of the impl</p> <p>If you want something more robust, you could do the following. It will work for this specific case. I am going to see if I can optimize it to be more generic though :)</p> <pre><code>public static class myExt { public static List<Parent> OrderByWithTieBreaker(this List<Parent> parents, int depth = 0) { if (depth > parents[0].Children.Count()) return parents; var returnedList = new List<Parent>(); Func<Parent, int> keySelector = x => { IEnumerable<Child> enumerable = x.Children.OrderBy(y => y.Age).Skip(depth); if (!enumerable.Any()) return 0; //If no children left, then return lowest possible age return enumerable.Min(z => z.Age); }; var orderedParents = parents.OrderBy(keySelector); var groupings = orderedParents.GroupBy(keySelector); foreach (var grouping in groupings) { if (grouping.Count() > 1) { var innerOrder = grouping.ToList().OrderByWithTieBreaker(depth + 1); returnedList = returnedList.Union(innerOrder).ToList(); } else returnedList.Add(grouping.First()); } return returnedList; } } [TestFixture] public class TestClass { public class Parent { public string Name { get; set; } public List<Child> Children { get; set; } } public class Child { public int Age {get;set;} } [Test] public void TestName() { var parents = new List<Parent> { new Parent{Name="P3", Children = new List<Child>{new Child{Age=1}, new Child{Age=3}, new Child{Age=6}, new Child{Age=7}}}, new Parent{Name="P4", Children = new List<Child>{new Child{Age=1}, new Child{Age=3}, new Child{Age=6}, new Child{Age=7}}}, new Parent{Name="P2", Children = new List<Child>{new Child{Age=1}, new Child{Age=3}, new Child{Age=6}}}, new Parent{Name="P1", Children = new List<Child>{new Child{Age=1}, new Child{Age=2}, new Child{Age=7}}}, new Parent{Name="P5", Children = new List<Child>{new Child{Age=1}, new Child{Age=4}, new Child{Age=5}}} }; var f = parents.OrderByWithTieBreaker(); int count = 1; foreach (var d in f) { Assert.That(d.Name, Is.EqualTo("P"+count)); count++; } } </code></pre>
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1. This table or related slice is empty.
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1. POOrder parent collection by minimum values in child collection in Linq
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  PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USJustin Pihony
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1. USJustin Pihony
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