Updated February 2024

There are three primary methods to examine the presence of a string within another string. These methods, derived from the string type, are:

• StartsWith()
• EndsWith()
• Contains()

Here is an example illustrating the usage of Contains().

bool result = "David McCarter".Contains("David");

Benchmark Results

When employing StartsWith(), utilizing it with StringComparison.Ordinal and StringComparison.OrdinalIgnoreCase yields nearly identical speeds. Additionally, employing Ordinal is 42.38 times more efficient than using it without specifying a StringComparison.

As evident in the performance analysis of EndsWith(), employing it with StringComparison.OrdinalIgnoreCase is 1.47 times faster than using StringComparison.Ordinal, and a notable 7.68 times faster compared to not specifying a StringComparison.

When utilizing Contains(), opting for no StringComparison specification proves to be the most performant, being 1.39 times faster than using StringComparison.Ordinal and 1.82 times faster than using StringComparison.OrdinalIgnoreCase.

For further information on checking for a substring, please consult the Internationalization and Localization chapter in my code performance book.

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