CODEWITHSUNDEEP
c#asp.netasp.net-mvc
user2232273
user2232273

Reputation: 4964

MVC - Controller - Make a Simple Math Calculation - Variable + 1

I have a little problem to make a simple math calculation in the controller.

what I try to do is add +1 to a number of a variable.

Here is an example for you to understand better what I try to do:

 var a= formcollection["Id_this"];

 var next = a + 1;

Note: the value of "Id_this" is "1".

The result I need for the variable next is 2

My problem is that the result of the variable next is "12".

Upvotes: 1

Views: 1307

Answers (3)

Kaf
Kaf

Reputation: 33809

Reason is you are doing string concatenation. Try this safe approach:

int number;
int next = 0;

if(Int32.TryParse(formcollection["Id_this"], out number))
{
   next = number + 1;
}
else
{
   //formcollection["Id_this"] is not a number
}

Upvotes: 1

Daniel Hilgarth
Daniel Hilgarth

Reputation: 174299

a is a string. Adding a number to a string results in the number being converted to a string and being concatenated.

To make it work, you first need to convert a to a number:

var next = Convert.ToInt32(a) + 1;

Upvotes: 4

Pascalz
Pascalz

Reputation: 2378

like this :

var next = int.Parse(a) + 1;

Upvotes: 0

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