raygun_filter_attributes.cs

// RaygunErrorHandlerAttribute.cs

using System.Web.Mvc;
using Microsoft.WindowsAzure;
using Mindscape.Raygun4Net;

namespace MyProject.Attributes
{
    public class RaygunErrorHandlerAttribute : HandleErrorAttribute
    {
        public override void OnException(ExceptionContext filterContext)
        {
            var apiKey = CloudConfigurationManager.GetSetting("RaygunApiKey");

            var httpCtx = filterContext.RequestContext.HttpContext;

            if (!httpCtx.Request.IsLocal)
            {
                // Local requests should not notify Railgun, a long debugging session might cap our account pretty soon
                var exception = filterContext.Exception;
                new RaygunClient(apiKey).Send(exception);
            }
        }
    }
}

// RaygunErrorHandlerHttpAttribute.cs

using System.Threading;
using System.Threading.Tasks;
using System.Web;
using System.Web.Http.Filters;
using Microsoft.WindowsAzure;
using Mindscape.Raygun4Net;

namespace MyProject.Attributes
{
    public class RaygunErrorHandlerHttpAttribute : IExceptionFilter
    {
        public bool AllowMultiple { get; private set; }

        public Task ExecuteExceptionFilterAsync(HttpActionExecutedContext actionExecutedContext, CancellationToken cancellationToken)
        {
            var apiKey = CloudConfigurationManager.GetSetting("RaygunApiKey");

            var httpCtx = HttpContext.Current;
            return Task.Factory.StartNew(() => LogError(actionExecutedContext, httpCtx, apiKey));
        }

        private static void LogError(HttpActionExecutedContext actionExecutedContext, HttpContext httpCtx, string apiKey)
        {
            if (actionExecutedContext.Exception != null && !httpCtx.Request.IsLocal)
            {
                // Local requests should not notify Railgun, a long debugging session might cap our account pretty soon
                var exception = actionExecutedContext.Exception;
                new RaygunClient(apiKey).Send(exception);
            }
        }
    }
}