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I have a question about LINQ query. Normally a query returns a IEnumerable<T> type. If the return is empty, not sure if it is null or not. I am not sure if the following ToList() will throw an exception or just a empty List<string> if nothing found in IEnumerable result?
List<string> list = {"a"}; // is the result null or something else? IEnumerable<string> ilist = from x in list where x == "ABC" select x; // Or directly to a list, exception thrown? List<string> list1 = (from x in list where x == "ABC" select x).ToList(); I know it is a very simple question, but I don't have VS available for the time being.
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By default, LINQ queries return a list of objects as an anonymous type. You can also specify that a query return a list of a specific type by using the Select clause.
The DefaultIfEmpty operator is used to replace an empty collection or sequence with a default valued singleton collection or sequence. Or in other words, it returns a collection or sequence with default values if the source is empty, otherwise return the source.
LINQ to SQL does not impose C# null or Visual Basic nothing comparison semantics on SQL. Comparison operators are syntactically translated to their SQL equivalents. The semantics reflect SQL semantics as defined by server or connection settings.
It will return an empty enumerable. It won't be null. You can sleep sound :)
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