How to convert a string to integer in C# ?

Published on September 16, 2012 by abundantcode

Filed under C#

Last modified September 16, 2012

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You can convert a string to integer in C# using the following functions

1. Int32.Parse / int.Parse

2. Convert.ToInt32

3. Int.TryParse()

Below is a sample sourcecode demonstrating the usage of the above functions

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{ 
    class Program
    {
        static void Main(string[] args)
        {
            string str = "200";
            int data1 = Int32.Parse(str);
            int data2 = int.Parse(str);

            int data3;
            int.TryParse(str, out data3);
            int data4 = Convert.ToInt32(str);
        }
    }
}

The advantage of using the int.tryparse is that when the string (str) in the above example is a invalid number , a default value is assigned via the “out” parameter but incase of int.parse and convert.ToInt32 , an exception is thrown.

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