The Ref and Out parameter is used when your method wants to
return one or more values
Ref Keyword :
While
using the Ref keyword we need to initialize the parameter before passing to
metod. If you want to pass variable as Ref parameter you need to initialize before
pass. Ref keyword will pass parameter as reference, it means when the value of
parameter is changed in called method it get reflected in calling method.
Example :
class Program
{static void Main(string[] args)
{
int intRef = 2;
int Value = MethodCall(ref intRef);
Console.WriteLine("Ref Value : " + Value);
Console.ReadLine();
}
private static int MethodCall(ref int intRef)
{return 5 + intRef;
}
}
OUTPUT : Ref Value : 7
Out Keyword :
Wjile using Out keyword we don’t need toinitialize the
parameter before passing to method. Out keywork also you pass as paameter as
reference but here we need to initialize out parameter before it return to
calling method.
Example :
static void Main(string[] args)
{int intOut;
int Value = MethodCall(out intOut);
Console.WriteLine("Out Value : " + Value);
Console.ReadLine();
}
private static int MethodCall(out int intOut)
{
return intOut = 3;
}
OUTPUT : Out Value : 3
Note :
1)
Passing by reference and the concept of
reference type these two concepts are not the same.
2)
Properties cannot be passed to ref or out
parameters since internally they are functions.