Code Inspection: Return value of pure method is not used
Consider the following code snippet:
name.Replace(", ", " ");
While it may appear that the code is doing something, it really is not! The reason is that, since strings are
does not replace anything in the original string (unlike, e.g., a
you’ve done is wasted a few CPU cycles, since the result of the pure function call did not get assigned to
You may also wonder how ReSharper knows that
string.Replace is pure. Well, the trick is done with
for the .NET Framework Class Library and other frequently used libraries.
These annotations are included in the ReSharper installation.
[Pure] attribute that triggers this
inspection can be also used
for your custom pure methods,
or you can use the mechanism of
external annotations to annotate pure methods in compiled libraries
that you use.