Code Inspection: Parameter output value is always discarded (non-private accessibility)
Last modified: 21 July 2022tip
The C# 6.0 "out var" greatly reduces the amount of code needed to use methods with out
parameters — now we almost always declare variables inline and often use type inference to omit variable type: dictionary.TryGetValue(key, out var value).
Another aspect of out
parameters that C# 6.0 has improved is the ability to ignore the output parameter values that we don't need with M(out _)
or M(out var _)
syntax. So it's not uncommon to see invocations like DoSomething(arg, out _, out _)
in modern C# codebase.
ReSharper analyzes such invocations and reports out
parameters that are discarded on all call sites. This helps identify potential problems of a value being always discarded and simplify the signature by removing the unused parameters.