Parameters in. NET

: CLR allows methods to be overloaded based on whether the out or ref parameters are used. However, if the two overload methods only have the difference between out and ref, it is invalid because the metadata representation of the two signatures is identical.

: When a variable number of parameters is called, some additional performance loss will occur (unless null is explicitly passed), because the array object must be allocated on the stack and the array element must be initialized, in addition, the Array Memory must eventually be garbage collected. To reduce performance loss, consider defining several overloaded versions that do not use the params keyword. See the Concat method of the System. String class.