Parameters

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Another way to define variables is through the use of formal method parameters. Table D.1 outlines the four types of method parameters.

Table D.1. Parameter Types in C#

Parameter Type	Modifier	Description
value	none	Modifications do not impact original argument passed into the method.
reference	ref	Modifications directly impact original argument passed into the method.
output	out	Used for passing values out of a method. Initial value is inconsequential.
parameter array	params	Enables variable length parameter lists.

Consider the following class, which employs each of the parameter types:

  using System; class Test {     public void ValueParamMethod(int a)     {         a += 2; // the original parameter is not modified     }     public void RefParamMethod(ref int a)     {         a += 2; // the original parameter is not modified     }     public void OutParamMethod(out int a)     {         a = 2; // original value unimportant, a set to 2 and passed out     }     public void ParamArrayMethod(params int[] args)     {         // provides flexibility through indefinite number of arguments     } } 

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