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Global Error Handling - (ASP.NET MVC Logging and Error Handling)

In any web application, errors can occur at any time due to various reasons such as server issues or user error. To ensure that your application performs as expected, it is important to implement global error handling. In this tutorial, we'll discuss how to implement global error handling in an ASP.NET MVC application using logging and error handling techniques.

Syntax

To implement global error handling in ASP.NET MVC, we need to write code to handle errors globally. This can be done by adding the following code to Global.asax.cs:

void Application_Error(object sender, EventArgs e)
{
    Exception ex = Server.GetLastError();

    // Log the error using a logging framework (e.g. log4net)
    log.Error(ex);

    // Redirect the user to a custom error page
    Response.Redirect("~/Error");
}

Example

To demonstrate global error handling in ASP.NET MVC, let's consider an example where we want to log all the errors that occur in our application using log4net and redirect the user to a custom error page. The following code can be added to Global.asax.cs:

using log4net;

namespace YourNamespace
{
    public class MvcApplication : System.Web.HttpApplication
    {
        private static readonly ILog log = LogManager.GetLogger(typeof(MvcApplication));

        protected void Application_Start()
        {
            // Configure log4net
            log4net.Config.XmlConfigurator.Configure();
        }

        protected void Application_Error(object sender, EventArgs e)
        {
            Exception ex = Server.GetLastError();

            // Log the error using log4net
            log.Error(ex);

            // Redirect the user to a custom error page
            Response.Redirect("~/Error");
        }
    }
}

With this code, any errors that occur in the application will be logged using log4net and the user will be redirected to the custom error page.

Explanation

In the above code, we override the Application_Error method in Global.asax.cs. Inside this method, we get the last exception using Server.GetLastError(). Then, we log the error using a logging framework such as log4net and redirect the user to a custom error page using Response.Redirect().

The Application_Error method is called whenever an unhandled exception occurs in the application. By using this method, we can handle errors globally in our application.

Use

Implementing global error handling using logging and error handling techniques is important to ensure that the application performs as expected and users are not presented with unfriendly error messages. By logging errors using a logging framework and redirecting the user to a custom error page, we can provide users with a better user experience and make it easier to debug and diagnose issues in the application.

Important Points

Here are some important points to keep in mind when implementing global error handling in an ASP.NET MVC application:

  • Always log errors using a logging framework such as log4net to make it easier to diagnose and debug issues in the application.
  • Redirect the user to a custom error page to provide a better user experience and avoid showing unfriendly error messages.
  • Customize error handling based on the type of error to provide more detailed error messages and take appropriate actions.

Summary

In this tutorial, we discussed how to implement global error handling in an ASP.NET MVC application using logging and error handling techniques. We covered the syntax, example, explanation, use, and important points of global error handling in ASP.NET MVC. With this knowledge, you can implement global error handling in your own application to ensure that it performs as expected and provides a better user experience.

Logging in ASP.NET MVCMiddleware for exception handling
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