Скачать или смотреть Comparing Two Strings Ignoring Case in C#

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Summary: Learn how to compare two strings in C# while ignoring case sensitivity using various methods such as `String.Equals`, `String.Compare`, and `ToLower`/`ToUpper` conversions.
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When working with strings in C, it's often necessary to compare them in a case-insensitive manner. Fortunately, C provides multiple ways to achieve this. In this guide, we will explore different methods to compare two strings while ignoring case sensitivity.

Using String.Equals Method

The String.Equals method is one of the most straightforward ways to compare two strings. It includes an overload that allows you to specify a StringComparison enumeration to control how the comparison is performed.

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In the example above, StringComparison.OrdinalIgnoreCase is used to ignore case during the comparison.

Using String.Compare Method

Another approach is to use the String.Compare method, which also allows specifying a StringComparison enumeration.

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Here, String.Compare returns 0 when the strings are equal, ignoring case differences.

Converting to Lowercase or Uppercase

A more manual approach involves converting both strings to the same case (either lower or upper) before comparing them. This method is less efficient but can be useful in some scenarios.

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Alternatively, you can convert both strings to uppercase:

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Using Equals Method on Strings

Strings in C also have an instance method Equals that can be used with a StringComparison parameter to perform case-insensitive comparisons.

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Conclusion

Comparing two strings while ignoring case sensitivity is a common task in C. Whether you use String.Equals, String.Compare, or manual case conversion methods, C provides flexible and easy-to-use options to achieve your goal. Each method has its use cases and can be chosen based on the specific requirements of your application.