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Home/ Questions/Q 505867
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T06:38:33+00:00 2026-05-13T06:38:33+00:00

Is there difference in speed between Dictionary.ContainsKey/Value and a foreach loop that checks for

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Is there difference in speed between Dictionary.ContainsKey/Value and a foreach loop that checks for a certain key/value?

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  1. Editorial Team
    Editorial Team
    2026-05-13T06:38:33+00:00Added an answer on May 13, 2026 at 6:38 am

    ContainsKey is faster :

    This method approaches an O(1) operation.

    ContainsValue is like a foreach loop.

    This method performs a linear search; therefore, the average execution time is proportional to Count. That is, this method is an O(n) operation, where n is Count.

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