C# pass by reference mechanism
In the previous C# tutorial, we discussed pass by value mechanism. In this C# tutorial, we are going to learn to pass by refresh mechanism in C# programming. In the pass by value, when a method is called, a new storage location is created for each value parameter but, In the pass by reference mechanism when a method is called, a new storage location is not created for each value parameter.
You can say opposite mechanism of C#.In the C# pass by value mechanism, It does not modify the original value but In the C# pass by reference, it modifies the original value.
If you are tried an example of pass by value it will be easy for you. A reference parameter is a reference to a memory location of a variable.
In C# programming, we declare the reference parameter using the ref keyword.
Let's create a swapping example of the variable parameter as reference.
using System.IO;
using System;
class PassByValue
{
void swap(ref int x, ref int y) {
int tmp = x;
x = y;
y = tmp;
}
static void Main()
{
int m = 8;
int n = 17;
PassByValue obj=new PassByValue();
Console.WriteLine("Before swapping (m,n) evaluate to:"+m+" ,"+n);
obj.swap(ref m,ref n);
Console.WriteLine("After swapping (m,n) evaluate to::"+m+" ,"+n);
}
}
Execute the above C# program and you will get the result as output.
Output-
Before swapping (m,n) evaluate to:8 ,17 After swapping (m,n) evaluate to::17 ,8
