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PO
primarykey
Id
12264865
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-09-04T13:46:31.810
FavoriteCount
0
LastActivityDate
2012-09-05T06:55:33.347
LastEditDate
2012-09-05T06:55:33.347
LastEditorUserId
1619691
OwnerUserId
1619691
ParentId
12125295
PostTypeId
2
Score
0
ViewCount
0
LastEditorDisplayName
text
Body
<code>list</code> is a collection of elements to be sorted. <code>pattern</code> is a collection of elements in specific order. <code>result</code> is a collection of elements from <code>list</code> ordered according to the <code>pattern</code>. <pre><code>var list = new List<Foo> { new FooA(), new FooB(), new FooC(), new FooA(), new FooC(), new FooA(), new FooD() }; var pattern = new Foo[] { new FooB(), new FooC(), new FooD(), new FooA() }; var result = list.OrderBy(p => p, new MyFooComparer(pattern)); </code></pre> There is a class <code>MyFooComparer</code> that implements interface <code>IComparer<></code>. Comparison is based on the position of each <code>Foo</code> in <code>pattern</code> collection. <code>pattern</code> elements must not be duplicated and they must contain all types of <code>Foo</code> (at least those used in <code>list</code>). I used <code>Dictionary<></code> to store the pattern order because it has O(1) complexity. <pre><code>public class MyFooComparer : IComparer<Foo> { private readonly Dictionary<Type, int> _pattern; public MyFooComparer(IEnumerable<Foo> pattern) { _pattern = new Dictionary<Type, int>(); int i = 0; foreach (var foo in pattern) { _pattern.Add(foo.GetType(), i); i++; } } public int Compare(Foo x, Foo y) { var xVal = _pattern[x.GetType()]; var yVal = _pattern[y.GetType()]; return xVal.CompareTo(yVal); } } </code></pre> After calling: <pre><code> foreach (var foo in result) { Console.WriteLine(foo.GetType().Name); } </code></pre> According to the <code>pattern</code>, you will get: <pre><code>FooB FooC FooC FooD FooA FooA FooA </code></pre> EDIT: Extension for <code>List<Foo></code>: <pre><code>static class MyExtension { public static IEnumerable<Foo> OrderByFoo<T>(this List<Foo> list, IEnumerable<Foo> patern) { return list.OrderBy(p => p, new MyFooComparer(patern)); } } </code></pre>
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1. POHow to order a list by type?
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