Function Parameters in C#

Function parameters in C# are variables defined in a method that receive values when the method is called. They allow you to pass data into methods and use it inside the method.

Syntax:

return_type MethodName(data_type parameter1, data_type parameter2)
{
// method body
}

Example: Below is function that takes two parameters of integer datatype and prints their sum:

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Types of Function Parameters in C#

1. Value Parameters

Value parameters pass a copy of the variable’s data to the method. Any changes made inside the method do not affect the original variable.

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Changes are local to the method because the argument is passed by value.

2. Ref Parameters

The ref keyword passes arguments by reference, allowing the called method to modify the original variable's value.

Rules:

• The variable must be initialized before passing to ref.
• Changes made inside the method reflect in the calling scope.

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3. Out Parameters

The out keyword is used to pass parameters by reference, mainly to return multiple values from a method.

Rules:

• The variable need not be initialized before passing.
• The method must assign a value before returning.

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4. In Parameters

The in keyword passes arguments by reference but does not allow modification inside the method.

5. Default (Optional) Parameters

Optional parameters allow you to omit arguments when calling a method. Each optional parameter has a default value, which is used when no argument is provided.

Rules:

• Must be defined after all required parameters.
• Can be omitted at the time of the call.

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6. Named Parameters

Named parameters allow you to pass arguments by specifying the parameter names, instead of relying on their order. It was introduced in C# 4.0.

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Named parameters must appear after all positional arguments in a method call.

7. Params Parameters

The params keyword allows a method to accept a variable number of arguments of the same type.

Rules:

• Only one params parameter is allowed per method.
• Must be the last parameter in the definition.