Implementing Elmah in web api project - asp.net-web-api2

Question

I am trying to implement ELMAH in a webapi project,since I am new to this elmah technique,I am not able to implement the entire thing.I even tried to follow the sample codes in web but still I am not getting.
can someone please help me to achieve a proper working solution with elmah.
I will be very thankful if a working solution is provided for demo purpose which will be really helpful for me to understand

Answer 1

Here are the steps to send error emails using Elmah
Install Elmah Nuget Package
Update config file to use proper SMTP settings. Here is the example of config file settings
< security allowRemoteAccess="false" />
< errorMail subject="Production Error - {1}: {0}" smtpServer="server address" from="me#you.com" to="you#me.com" />
Create ExceptionLogger class. Here is the example of it
public class ElmahExceptionLogger : ExceptionLogger
{
private const string HttpContextBaseKey = "MS_HttpContext";
public override void Log(ExceptionLoggerContext context)
{
// Retrieve the current HttpContext instance for this request.
HttpContext httpContext = GetHttpContext(context.Request);
// Wrap the exception in an HttpUnhandledException so that ELMAH can capture the original error page.
Exception exceptionToRaise = new HttpUnhandledException(message: null, innerException: context.Exception);
ErrorSignal signal;
if (httpContext == null)
{
signal = ErrorSignal.FromCurrentContext();
// Send the exception to ELMAH (for logging, mailing, filtering, etc.).
signal.Raise(exceptionToRaise);
}
else
{
signal = ErrorSignal.FromContext(httpContext);
signal.Raise(exceptionToRaise);
}
}
private static HttpContext GetHttpContext(HttpRequestMessage request)
{
HttpContextBase contextBase = GetHttpContextBase(request);
if (contextBase == null)
{
return null;
}
return ToHttpContext(contextBase);
}
private static HttpContextBase GetHttpContextBase(HttpRequestMessage request)
{
if (request == null)
{
return null;
}
object value;
if (!request.Properties.TryGetValue(HttpContextBaseKey, out value))
{
return null;
}
return value as HttpContextBase;
}
private static HttpContext ToHttpContext(HttpContextBase contextBase){return contextBase.ApplicationInstance.Context; } }
Register ElmahExceptionLogger class with Web API in startup.cs
config.Services.Add(typeof(IExceptionLogger), new ElmahExceptionLogger());

Answer 2

Even though the answer by #Paresh works, you should use the Elmah.Contrib.WebApi package, since that includes everything needed to use ELMAH with Web API.
I've written a guide to install ELMAH with Web API. Basically you will install the ELMAH and Elmah.Contrib.WebApi packages and then configure it like this:
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
...
config.Services.Add(typeof(IExceptionLogger), new ElmahExceptionLogger());
...
}
}
Regarding the mail configuration, you can validate your web.config using the ELMAH Configuration Validator.