What do you mean by 'ref' modifier in C# programming language?

 Posted by Goud.Kv on 9/3/2014 | Category: C# Interview questions | Views: 319 | Points: 40
Answer:

ref is a C# reference which is used to pass the reference types. It cannot pass the value types. This is mostly used in swapping implementations.
We have to declare it while writing a method and again need to use at calling point.

Example,
class MyClass

{
static void Reverse(ref string first, ref string second)
{
string name = first;
first = second;
second = name;
}
static void Main()
{
string firstName = "Krishna";
string lastName = "Vamshi";
Reverse(ref firstName, ref lastName); // Calling method

Console.WriteLine(firstName); // Vamshi
Console.WriteLine(lastName); // Krishna
}
}
In the above code, we have implemented a swap method and interchanging the first and last names using ref modifier.


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