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Params prameter, is giving error while accesing.

Params prameter, is giving error while accesing.

Hemalatha Sunnapu

8y796Visual Basic .NET

namespace ParamsCheck

{

class Program

{

public void Method(params int [] arr)

{

arr[1]=Convert.ToInt32( Console.ReadLine());

}

static void Main(string[] args)

{

Program obj = new Program();

//int[] arr = new int[1];

int []arr= {1 };

obj.Method();

Console.Read();

}

}

}

I am getting this error.

5 Replies

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Jaish Mathews8y ago
Accepted answer
What I meant by, if array is empty, you can't use assignment arr[1] =.....
Because it'sempty. Either you need to check for empty before assign or pass some value.
Jaish Mathews8y ago
1st...your checking is wrong. It should be like below

if (arr != null && arr.Length > 0)
{
arr[1] = Convert.ToInt32(Console.ReadLine());
}

This tell that your assignment only do when array has some valid content.

2nd - your below code is not working, but it's just hiding error. If you pass some valid value or not passing some value, both cases you assignment line won't execute and so no error is coming. Becasue you are checking that your code need to execute only for null value, but any case you existing variable hasn't any null value, but empty only. Empty and null are 2 different concept. Please read more on it.
Hemalatha Sunnapu8y ago
Jaish , Its worked but how ?
i just checked whether it is empty or not like below..

if (arr == null)
{
arr[1] = Convert.ToInt32(Console.ReadLine());
}
why it is not working when we not checked like this?
Hemalatha Sunnapu8y ago
i had used params keyword , which allows even if won't pass any arguments and considers as empty array.
Jaish Mathews8y ago
You are calling like obj.Method();. But not passing the parameter. Did you try with obj.Method(arr);?