How to handle exception in asp.net MVC application
Exception handling in asp.net MVC application
In this article we will learn how to use exception handling
code in asp.net MVC application. Exception handling in MVC web application is
very similar to normal web or .NET application. Same try-catch block can
be implemented to handle exception in MVC application.
To understand the concept we will create small math
application, where we will perform division operation on two numbers.
Create simple calculator class
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace MVCApplication.Models
{
public class Calculator
{
public Int32 FirstNumber { get; set;}
public Int32 SecondNumber { get; set;
}
}
}
This calculator class is for perform calculation operation.
It has only two properties called FirstNumber and SecondNumber and both are
integer type.
Create Calculate controller
Now, We have to create one controller class to handle http
request. In our Calculation controller we have defined two actions. Index
action is to invoke view(which is simple form) and ShowResult action
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace MVCApplication.Controllers
{
public class CalculationController : Controller
{
public ActionResult Index()
{
return View("Index");
}
public ActionResult ShowResult()
{
Int32 A = Convert.ToInt32(Request.Form["FirstValue"]);
Int32 B = Convert.ToInt32(Request.Form["SecondValue"]);
try
{
return Content((A / B).ToString());
}
catch (Exception ex)
{
return Content("Error in Operation");
}
}
}
}
will get call when form value will submit on button’s click
event. Now, if we look inside of showResult() action, we will find that we are
performing division operation within try block and within catch we are
returning string “Error in Operation”. If we want we can return any view in
place of String with in catch statement.
Create view
Here we will create a simple view with two textboxes and one
button. Have a look on below code.
@model MVCApplication.Models.Calculator
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<title>Index</title>
</head>
<body>
<div>
<form action="Calculation/ShowResult" method="post">
<input id="FirstValue" name="FirstValue" type="text" /><br />
<input id="SecondValue" name="SecondValue" type="text" /><br />
<input id="Submit1" type="submit" value="Submit" />
</form>
</div>
</body>
</html>
We have created one strong type view and in action attribute
we have given path of showResult() action. It tells that when user will click
on Submit button, the ShowResult action() will get called.
Here is sample output.
We will supply 0 as second number.
Here is output string
Conclusion:-
Here we have learned how to use simple try-catch block in MVC application. It is very similar with any .NET application. We can implement all exception handling features in MVC application like any other .NET application.