Usage and distinction of ref and out and params usage

Formula: Ref has a in, out only out!

In C #, parameters can be passed either by value or by reference. Passing parameters by reference allows a function member to change the value of a parameter and keep the change. To pass parameters by reference, you can use the ref or out keyword for the corresponding parameter. It works much like a pointer in C.

Usage of ref:

1 namespaceConsoleApplicationTest201601252 {3     class Program4     {5         Static voidMain (string[] args)6         {7             stringA="Initialize! ";8Refmethod (refa);9Console.WriteLine ("usage test for ref keyword! \ t");TenConsole.WriteLine ("results: a="+a); One Console.readkey (); A          } -  -         Private Static voidRefmethod (ref stringa) the         { -A ="executed the ref! "; -         } -        +         -}

View Code

Operation Result:

Usage test for ref keyword!
Results: A= performed the ref!

Use of Out:

1 namespaceConsoleApplicationTest201601252 {3     class Program4     {5         Static voidMain (string[] args)6         {7             stringb//No initialization required8Outmethod ( outb);9Console.WriteLine ("usage test for out keyword! \ t");TenConsole.WriteLine ("results: b="+b); One Console.readkey (); A  -         } -  the         Private Static voidOutmethod ( out stringb) -         { -b ="executed the out!"; -         } +     } -}

View Code

Operation Result:
Usage test for Out keyword
Results: B= performed the out!

Usage and distinction of ref and out and params usage