ref/out Keyword in c#
Point to be kept in mind while using ref keyword.
variable “must” be initialized before it is passed into a method.
Example, Without Using ref keyword
class Test
{
public static void Main()
{
int a = 3;
DoWork(a);
Console.WriteLine("The value of a is " + a);
}
public static void DoWork(int i)
{
i++;
}
}
The program will result in : The value of a is 3
Example, With the Use of ref keyword
class Test
{
public static void Main()
{
int a = 3; // must be initialized
DoWork(ref a); // note ref
Console.WriteLine("The value of a is " + a);
}
public static void DoWork(ref int i) // note ref
{
i++;
}
}
The program will result : The value of a is 4
It is useful when we want to return more than one value from the method.
Point to be kept in mind while using out keyword.
You must assigned value to out parameter in method body, otherwise the method won’t compiled.
Example of “out keyword”:
class Test
{
public static void Main()
{
int a; // may be left un-initialized
DoWork(out a); // note out
Console.WriteLine("The value of a is " + a);
}
public static void DoWork(out int i) // note out
{
i=4; //must assigned value.
}
}
The program will result : The value of a is 4
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