Parameters in C#

Posted Date: 11 May 2006	Resource Type: Articles	Category: .NET Framework
Author: Ramakrishna	Member Level: Gold
Rating:	Points: 5

Parameters in C#

Parameters: Passing a values to the called function from the calling function

There are four different types of parameters in C#. They are
1. Value parameters
2. Ref parameters
3. Out parameters
4. Parameter arrays (Params)

1. Value parameters

A parameter declared with no modifiers is a value parameter and This is the default parameter type in C#. In this type of parametrs actual value is passed to the function, and the changes made in the function not affect the original value in the calling function.

Eg.

static void fnValue( int i)
{
i = i + 1;
}

2. Ref parameters
Ref parameters are input/output parameters. This type of parameters are declared with the modifier “ref” . these parameters are used to pass the values back and fourth between the called function and calling function. Here the actual reference of the variable is passed to the function.
static void fnRef( ref int i)
{
i = i + 1;
}

3. Out parameters
Out parameters are Similar to a reference parameter, these parameters are declared with the out modifier. Output parameters are typically used in methods that produce multiple return values. The out put parameters can only pass back a value from a function. Every output parameter of a method must be assigned before the method returns.

static void fnOut ( out int k, out int i )
{
k =5;
i=9;
}

4. Parameter arrays
This type parameters are declared with the modifier params. These types of parameters are very useful when we need to pass the number of arguments to the function. In the parameter list the parameter array must be the last parameter. and it must be of a single-dimensional array type. params parameters are input type parameters.

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