YouTipCsharp Param Arrays
# C# Parameter Arrays
[ C# Arrays](#)
Sometimes, when declaring a method, you cannot be certain of the number of arguments to pass to the function as parameters. C# parameter arrays solve this problem. Parameter arrays are typically used to pass an unknown number of arguments to a function.
## The params Keyword
When using an array as a formal parameter, C# provides the `params` keyword. This allows a method with an array as a formal parameter to be called either by passing an array argument or by passing a list of array elements. The syntax for using `params` is:
public ReturnType MethodName( params TypeName[] ArrayName )
## Example
The following example demonstrates how to use parameter arrays:
## Example
using System;
namespace ArrayApplication
{
class ParamArray
{
public int AddElements(params int[] arr)
{
int sum =0;
foreach(int i in arr)
{
sum += i;
}
return sum;
}
}
class TestClass
{
static void Main(string[] args)
{
ParamArray app =new ParamArray();
int sum = app.AddElements(512, 720, 250, 567, 889);
Console.WriteLine("Sum is: {0}", sum);
Console.ReadKey();
}
}
}
When the above code is compiled and executed, it produces the following result:
Sum is: 2938
[ C# Arrays](#)