Mega Code Archive
0119 Optional parameters
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Methods, constructors and indexers can have optional parameters.
An optional parameter is declared with default value.
using System;
class Program
{
static void output(int i = 5)
{
Console.WriteLine("i=" + i);
}
static void Main(string[] args)
{
output();
output(10);
}
}
The output:
i=5
i=10
Optional parameters cannot be marked with ref or out.
Optional parameters must be declared before any another parameters.
When calling a method with optional parameters we provide the optional parameters first.
using System;
class Program
{
static void output(int i = 5, int j = 6)
{
Console.WriteLine("i=" + i);
Console.WriteLine("j=" + j);
}
static void Main(string[] args)
{
output();
output(10);
output(10, 20);
}
}
The output:
i=5
j=6
i=10
j=6
i=10
j=20
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