Skip to main content

Difference between int.Parse and Convert.ToInt32

I know this post sound basic to most of people but still lots of people does not know this. So I decided to post a blog post for this. Both int.Parse and Convert.ToInt32 are used to convert string into the integer but Only difference between them is to Convert.ToInt32 handle null and returns ‘0’ as output and int.parse is not going to handle NULL and will give a Argument Null Exception. Here is the example for that both are almost same except handling null.


          string convertToInt = "12";
string nullString = null;
string maxValue = "32222222222222222222222222222222222";
string formatException = "12.32";

int parseResult;

// It will perfectly convert interger
parseResult= int.Parse(convertToInt);

// It will raise Argument Null Exception
parseResult= int.Parse(nullString);

//It willl raise Over Flow Exception
parseResult= int.Parse(maxValue);

//It will raise Format Exception
parseResult= int.Parse(formatException);


//For Convert.ToInt32

//It will perfectly convert integer
parseResult= Convert.ToInt32(convertToInt);

//It will ouput as 0 if Null string is there
parseResult= Convert.ToInt32(nullString);

//It will raise Over Flow Exception
parseResult= Convert.ToInt32(maxValue);

//It will raise Format Exception
parseResult= Convert.ToInt32(formatException);

Hope this will help you understand the better but still there is third option available called int.TryParse which can handle all kind of exception and return result as Output Parameter.

Shout it
kick it on DotNetKicks.com

Comments

  1. Nice post, I for one did not knew the difference. Do you know why this is implemented this way? Because from the names of the namespaces and the methods I could not have seen that there would be any difference. (In contrast to int.Parse and int.TryParse)

    P.S. your "post comment" functionality doesn't work that well in firefox :-(

    ReplyDelete
  2. I don't think its implemented for any purpose. It just a way that how the things are converted into interger both are diffrent ways

    ReplyDelete
  3. This is a nice article..
    Its very easy to understand ..
    And this article is using to learn something about it..
    asp.net, c#, javascript
    Thanks a lot..!

    ReplyDelete
  4. I have already implemented disqus for that so it will work fine on all the browser

    ReplyDelete
  5. i want to clear my ASP.Net exam in this semester. I have 1 month. How can i learn it?? Please say.

    ReplyDelete
  6. well that you need to depend on the book which you are referring!. I am not a professor :)

    ReplyDelete

Post a Comment

Your feedback is very important to me. Please provide your feedback via putting comments.

Popular posts from this blog

How to create Rest API(Web API) with ASP.NET Core 1.0

Recently Microsoft has released ASP.NET Core 1.0 RC2, I am getting lots of request from readers that about creating Web API. So I thought it will be a good idea to write a blog post about how to create Rest API(Web API) with ASP.NET Core 1.0.

So let’s get started via creating an ASP.NET Core 1.0 Web Application like following.



Once you click on ASP.NET Web Application, It will ask whether you need to create Web Application or Web API application. We are going to Web API so I am going to select Web API Application like following. Please note that in ASP.NET Core 1.0 there is no separate libraries or DLLs required for creating web APIs. This is just a project template.



Now once you click on OK It will create a Web API application with default values controller and program.cs.  As you know Program.cs is now starting point for the ASP.NET Core 1.0 application so It contains all the required configuration and startup items. Following is a code for that.
using System.IO; using Microsoft.Asp…

How to use migration with Entity Framework Core

Entity framework core is  the lightweight, extensible and cross-platform version of Entity Framework. Before some time, Microsoft has Released a new version of Entity Framework RC2. I have written a couple of blog post about Entity framework code first migration earlier for Entity framework 6.0. So there was a couple of request coming for writing a blog post about Entity Framework Core RC2 migration. So I thought it will be a good idea to give an overview how database migration works in Entity Framework Core RC2. This post will cover a basic scenario where we are going to create the database with existing ASP.NET Identity migration and then we are going to create a new model and have that migration applied in the database.

How to use Entity Framework Migrations: Let’s get started, To demonstrate entity framework core migrations, I am going to create a sample asp.net core web application like following.



Once we select asp.net core application it will appear the following dialog.



Now w…

Solution: gulp is not recognized as internal or external command- Visual Studio

Recently, After Upgrading to the newer version of Gulp, I was getting this error.  After doing lots of  finding online and in my system I was able to figure out that Modules like Gulp does not installed to the path. So when you try to run it from the command line it was showing below error.
gulp is not recognized as internal or external command How to solve : gulp is not recognized as internal or external command To solve this error we just need to create a new environment variable and set the NPM modules path there.

To create an environment variable,  Right click My Computer/ This Pc and click on properties.  It will open following windows.



Go to Advance System Settings and it will open system properties windows like below.



Click on Environment Variables it will open an environment and system variables windows like below.



Click on new System variable and put NODE_PATH in system variable name and %AppData%\npm\node_modules into the variable value like below.



Click on Ok. That’s it. N…