The nameof operatorThe new nameof operator is a unary operator that takes, as its argument, a type, an identifier or a method and returns the name of the argument. That is, if you pass in the type Uri, you get back the string "System.Uri", if you pass in a variable you get back the name of the variable as a string.
In Nancy.Linker there was one opportunity for using nameof, which I coincidentally think represents a usage of nameof that will become widespread.
In one the private methods in Nancy.Linker there is a null check followed by a possible ArgumentException:
Notice how I am repeating the name of the res variable in a string in order to tell the ArgumentException which argument is in error. With the nameof operator I avoid this duplication and potential source of inconsistency as follows:
Note that in case I rename res and forget to update the usage inside nameof I get a compile error.