24 lines
1.0 KiB
Plaintext
24 lines
1.0 KiB
Plaintext
Looking for a given substring starting from a specified offset can be achieved by such code: ``++str.Substring(startIndex).IndexOf(char1)++``. This works well, but it creates a new ``++string++`` for each call to the ``++Substring++`` method. When this is done in a loop, a lot of ``++strings++`` are created for nothing, which can lead to performance problems if ``++str++`` is large.
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To avoid performance problems, ``++string.Substring(startIndex)++`` should not be chained with the following methods:
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* ``++IndexOf++``
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* ``++IndexOfAny++``
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* ``++LastIndexOf++``
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* ``++LastIndexOfAny++``
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For each of these methods, another method with an additional parameter is available to specify an offset.
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Using these methods gives the same result while avoiding the creation of additional ``++String++`` instances.
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== Noncompliant Code Example
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----
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str.Substring(StartIndex).IndexOf(char1); // Noncompliant; a new string is going to be created by "Substring"
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----
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== Compliant Solution
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----
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str.IndexOf(char1, startIndex) - startIndex;
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----
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