[Use of C # Foundation]ref and out

In C # If you need to convert a value type to a reference type and pass other methods and make its original value change, use ref and out to convert to a reference type pass.

1. Ref: A variable needs to be defined and initialized before using ref (must be initialized)

Class program    {        static void Main (string[] args)        {                        int i = 10;//define variable and initialize;            Console.WriteLine ("i =" + i);  Print Demo before delivery            (ref i);  By ref I change the reference pass            Console.WriteLine ("i =" + i);                       Console.readkey ();        }        The Receive method parameter also uses the REF keyword public        static void Demo (ref int i)        {            i = i + +;        }          }

Printing results:

2. Out: You need to define variables before using out, do not initialize; Initialization is left to the called method.

Class program    {        static void Main (string[] args)        {                        int i;//define variable [without initialization], if initialized here, the receiving method will be replaced;                 Demo (out i);  By passing out I change the reference pass            Console.WriteLine ("i =" + i);                       Console.readkey ();        }        The Receive method parameter also uses        the OUT keyword public static void Demo (out int i)        {            i = 100;//using the Out method initial work is done inside the methods            i = i + 200;< c14/>//I  + max = +}          }

The printing results are as follows:

[Use of C # Foundation]ref and out