What is more efficient: Dictionary TryGetValue or ContainsKey+Item?

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TryGetValue will be faster.

ContainsKey uses the same check as TryGetValue, which internally refers to the actual entry location. The Item property actually has nearly identical code functionality as TryGetValue, except that it will throw an exception instead of returning false.

Using ContainsKey followed by the Item basically duplicates the lookup functionality, which is the bulk of the computation in this case.

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