To declare a method which can accept any number of parameters of a particular type we use the params modifier.
The params parameter is declared as an array.
using System;
class Program
{
static void output(params int[] intPara)
{
for (int i = 0; i < intPara.Length; i++)
{
Console.WriteLine("params:" + intPara[i]);
}
}
static void Main(string[] args)
{
output(1, 2, 3);
output(1, 2, 3, 4, 5, 6);
}
}
The output:
params:1
params:2
params:3
params:1
params:2
params:3
params:4
params:5
params:6
You can pass real array for params type parameters.
using System;
class Program
{
static void output(params int[] intPara)
{
for (int i = 0; i < intPara.Length; i++)
{
Console.WriteLine("params:" + intPara[i]);
}
}
static void Main(string[] args)
{
output(new int[] { 1, 2, 3 });
}
}
The output:
params:1
params:2
params:3
The params type parameter must be the last parameter in that method.
using System;
class Program
{
static void output(int j, params int[] intPara)
{
Console.WriteLine("j:" + j);
for (int i = 0; i < intPara.Length; i++)
{
Console.WriteLine("params:" + intPara[i]);
}
}
static void Main(string[] args)
{
output(999, new int[] { 1, 2, 3 });
}
}
The output:
j:999
params:1
params:2
params:3