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• Can I split an IEnumerable into two by a boolean criteria without two queries?

  - by SFun28

  Folks, Is it possible to split an IEnumerable into two IEnumerables using LINQ and only a single query/linq statement? In this way, I would avoid iterating through the IEnumerable twice. For example, is it possible to combine the last two statements below so allValues is only traversed once? IEnumerable<MyObj> allValues = ... List<MyObj> trues = allValues.Where( val => val.SomeProp ).ToList(); List<MyObj> falses = allValues.Where( val => !val.SomeProp ).ToList();

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• Determine the relative complement of two IEnumerable<T> sets in .NET

  - by SFun28

  Is there an easy way to get the relative complement of two sets? Perhaps using LINQ? I have to find the relative compliment of a set A relative to B. Both A and B are of type HashSet<T> but I think the algorithm could be made more general (IEnumerable<T> or even ISet<T>)? I could use a solution in either VB.NET or C#.

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• Determine the relative compliment of two IEnumerable<T> sets in .net

  - by SFun28

  Hi! Is there an easy way to get the relative compliment of two sets? Perhaps using LINQ? http://en.wikipedia.org/wiki/Complement_(set_theory) I have to find the relative compliment of a set A relative to B. Both A and B are of type HashSet but I think the algorithm could be made more generation (IEnumerable or even ISet)? I could use a solution in either vb.net or C#.

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