[Edit]

C# - multiple parameters in method

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Created by:

Nabila-Burnett

385

In this short article, we would like to show how to pass multiple arguments to function in C#.

Quick solution:

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void DoSomething(params String[] argumnets) // <--- multiple arguments by using: params String[]
{
    // some logic here ...
​
    // int count = arguments.Length;
    //
    // argumnets[0]
    // argumnets[1]
    // argumnets[2]
    // ...
}
​
​
// Using:
​
DoSomething();
DoSomething("arg 1");
DoSomething("arg 1", "arg 2");
DoSomething("arg 1", "arg 2", "arg N");

1. Documentation

Edit

Simple case:

Definition syntax

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ResultType MethodName(params ArgumentsType[] arguments)
{
    /* ... */
}

Calling syntax

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ResultType result = MethodName(
    paramVariable1,
    paramVariable2,
    // ...
    paramVariableN
);

Description

By adding param keyword to function argument we are able to create function that accepts multiple arguments.

Using that construction it is required to:

use array type with that param argument,
put param argument always as last.

The number of total arguments depends on function calling.

Composed cases:

Definition syntax

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ResultType MethodName(
    ArgumentType1 argument1,
    ArgumentType2 argument2,
    // ...
    ArgumentTypeN argumentN,
    params ArgumentsType[] arguments
) {
    /* ... */
}

Calling syntax

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ResultType result = MethodName(
    variable1,      variable2,      variableN,       /* ... */
    paramVariable1, paramVariable2, paramVariableN   /* ... */
);

Practical example

Edit

In ths section you can see 2 example cases:

multiple arguments function,
normal arguments function extended with additional arguments.

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using System;
​
public class Program
{
    public static void Main(String[] args)
    {
        DoSomething();
        DoSomething("arg 1", "arg 2");
        DoSomething("arg 1", "arg 2", "arg 3", "arg N");
​
        DoSomething(1, 2, 3);
        DoSomething(1, 2, 3, "arg 1", "arg 2");
        DoSomething(1, 2, 3, "arg 1", "arg 2", "arg 3", "arg N");
    }
    
    private static void DoSomething(params String[] arguments)
    {
        Console.WriteLine("Arguments count: " + arguments.Length);
    }
    
    private static void DoSomething(int a, int b, int c, params String[] arguments)
    {
        Console.Write("a=" + a + ", ");
        Console.Write("b=" + b + ", ");
        Console.Write("c=" + c + ", ");
        Console.WriteLine("Arguments count: " + arguments.Length);
    }
}

Output:

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Arguments count: 0
Arguments count: 2
Arguments count: 4
a=1, b=2, c=3, Arguments count: 0
a=1, b=2, c=3, Arguments count: 2
a=1, b=2, c=3, Arguments count: 4