C # Use of Variable Function Parameters

In general, the parameters in the function are determined. However, in some cases, the number of parameters of a function can be changed as needed. To use a Variable Parameter Function, add Params before the parameter.

Here is a demo of mine:

View code

 1   Using System;
 2   Using System. Collections. Generic;
 3   Using System. LINQ;
 4   Using System. text;
 5  
 6  Namespace Demo
 7 {
 8       Class Program
 9 {
 10           Static   Void Vfunc ( Params   String [] Values)
 11 {
 12               Foreach (String S In Values)
 13 {
 14 Console. writeline (s );
 15 }
 16 }
 17         
 18           Static   Void Main ( String [] ARGs)
19 {
 20               String [] Names = { "  Zhm  " };
 21               String [] Sexs = { "  Male  " , "  Female  " };
 22 Vfunc (names );
 23 Vfunc (sexs );
 24 Console. readkey ();
 25 }
 26 }
 27 }

// Output zhm

Male

Female

Of course, a function can also contain variable parameters and constant parameters. Both can be used at the same time.

View code

 1   Using System;
2   Using System. Collections. Generic;
 3   Using System. LINQ;
 4   Using System. text;
 5  
 6   Namespace Demo
 7 {
 8       Class Program
 9 {
 10         
 11           Static   Void Sayhello ( String Name, Params   String [] Nichens)
 12 {
 13 Console. writeline ( "  My name {0}  " , Name );
 14              Foreach ( String Nicloud In Nichens)
 15 {
 16 Console. writeline ( "  My nickname {0}  " , Nicloud );
 17 }
 18 }
 19           Static  Void Main ( String [] ARGs)
 20 {
 21               String [] Names = { "  Zhm  " , "  Dd  " , "  YY  " , " II  " , "  UU  " };
 22 Sayhello ( "  Zhm  " , Names );
 23            
 24 Console. readkey ();
 25 }
 26 }
27 }

However, it is worth noting that variable parameters must be placed at the end of the parameter position in the function. If the above function is written as static void sayhello (Params string [] nichens, string name)

An error is displayed.: "The Params parameter must be the last in the image parameter table ".