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Friday, September 28, 2012

Handling Unhandled Exception Asp.NET MVC

Well, having unhandled exception is bad in the first place but displaying user a default IIS broken exception page or the yellow broken code page is even worse. Not a good user experience. But as all code/software there is always bugs and all ways a edge case that breaks unexpectedly. These unhandled expections can be handled in controller level in Asp.NET MVC. Following is a code snipped of handling errors and routing the user to a more user friendly error page.

public class HandleErrorAttribute: System.Web.Mvc.HandleErrorAttribute
{
 public override void OnException(ExceptionContext filterContext)
 {
  string askerUrl = filterContext.RequestContext.HttpContext.Request.RawUrl;
 
  Exception exToLog = filterContext.Exception;
  exToLog.Source = string.Format("Source: {0}{1}Requested Path: {2}{1}", 
    exToLog.Source, Environment.NewLine, askerUrl);
 
  //log your message somewhere
  Handle(exToLog); 
 
  filterContext.ExceptionHandled = true;
  filterContext.Result = new System.Web.Mvc.RedirectResult("~/Error");
 
  base.OnException(filterContext);
         }
}
 
namespace YourNameSpace
{
    [HandleError]
    public class YourController : Controller
    {
        //controller code - Actions
    }
}

In the above code, once the error is handled it's redirected to an Error Page. A user friendly error page such as this from clipthetrip.com

Labels: .NET, ASP.NET, CSharp

Saturday, September 1, 2012

Beer in my belly - IX

Acbc dizzy	Harviestoun bitter

Marooned on hog
	liefmans goudenband

Labels: BeerInMyBelly

Amazon SES (Simple Email Service) - Code

SES (simple email service) provided by Amazon is sleek easy to use email service. Unfortunately as always, anything new has limited documentation or overly complicated documentation. Following is a ready to use simple code snippet for using Amazon SES written in CSharp

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Amazon.SimpleEmail;
using Amazon.SimpleEmail.Model;
 
namespace Manager
{
    public class EmailManager
    {
        public string SendMail(List<string> toAddresses, List<string> ccAddress, List<string> bccAddress,
            string fromName, string fromAddress,
            string subject, string content,             
            string awsAccessKey, string awsSecretKey)
        {
            try
            {
                var amazonConfiguration = new AmazonSimpleEmailServiceConfig();
                var client = new AmazonSimpleEmailServiceClient(awsAccessKey, awsSecretKey, amazonConfiguration);
                 
                var destination = new Destination();
                destination.ToAddresses = toAddresses;
                destination.CcAddresses = ccAddress;
                destination.BccAddresses = bccAddress;
 
                var body = new Body()
                {
                    Html = new Content(content)
                };
 
                var emailSubject = new Content(subject);
                var message = new Message(emailSubject, body);
                var sendEmailRequest = new SendEmailRequest(string.Format("{0} <{1}>", fromName, fromAddress), destination, message);
 
                var response = client.SendEmail(sendEmailRequest);
                return response.SendEmailResult.MessageId;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
    }
}

Note: Amazon SDK needs to be installed or AWSSDK.dll need to be referenced. Download AWS SDK here So where can I find the “awsAccessKey” (Access key id) and “awsSecretKey” (Secret Key). Well, first login into AWS portal and then head over to Security Credentials page.