Part 15 Conversion Operators in LINQ

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The following standard LINQ query operators belong to Conversion Operators category
ToList
ToArray
ToDictionary
ToLookup
Cast
OfType
AsEnumerable
AsQueryable

ToList operator extracts all of the items from the source sequence and returns a new List[T]. This operator causes the query to be executed immediately. This operator does not use deferred execution.

ToArray operator extracts all of the items from the source sequence and returns a new Array. This operator causes the query to be executed immediately. This operator does not use deferred execution.

ToDictionary operator extracts all of the items from the source sequence and returns a new Dictionary. This operator causes the query to be executed immediately. This operator does not use deferred execution.

Please Note: Keys in the dictionary must be unique. If two identical keys are created by the keySelector function, the following System.ArgumentException will be thrown at runtime.
Unhandled Exception: System.ArgumentException: An item with the same key has already been added.

ToLookup creates a Lookup. Just like a dictionary, a Lookup is a collection of key/value pairs. A dictionary cannot contain keys with identical values, where as a Lookup can.

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