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[Source] Use case-ignoring strings in C#. Contains method

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Posted on 6/20/2019 11:24:09 PM | | |
To compare whether the source string contains the target string in C#, we can use the following method:



Relatively speaking, the Contains method is more intuitive because it directly returns a boolean value, but when we need to ignore case, we can only use the IndexOf overload method that supports the StringComparison parameter, but this method may not be semantic enough (the return value may be -1, 0, or greater than 0), although in this case many people may convert both the source string and the target string to uppercase or lowercase for comparison, but this is too inefficient. We can directly define an extension that supports the StringComparison parameter:


In fact. NET library The Contains method is also based on the IndexOf method:


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