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Alex Rivera
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I have a dictionary of the type: IDictionary<foo, IEnumerable<bar>> my_dictionary bar class looks like this: class bar { public bool IsValid {get; set;} } How can I create another dictionary with only those items that have IsValid = true. I tried this: my_dictionary.ToDictionary( p=> p.Key, p=> p.Value.Where (x => x.IsValid)); The problem with above code is that this creates a key with empty enumerable, if all the elements for that key were IsValid = false. for example: my_dictionar[foo1] = new List<bar> { new bar {IsValid = false}, new bar {IsValid = false}, new bar {IsValid = false}}; my_dictionary[foo2] = new List<bar> {new bar {IsValid = true} , new bar{IsValid = false}; var new_dict = my_dictionary.ToDictionary( p=> p.Key, p=> p.Value.Where (x => x.IsValid)); // Expected new_dict should contain only foo2 with a list of 1 bar item. // actual is a new_dict with foo1 with 0 items, and foo2 with 1 item. How do I get my expected.
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