Hello,

We're in the process of upgrading from Umbraco 7 to 8, a part of this is obviously the log4net to Serilog change. Previously we used an appender to assist with our exception reporting and from the looks of the documentation this feature has been replaced by sinks in Serilog.

But I can't for the life of me get the serilog config to register my custom sink, depending on how I try and configure the serilog.user.config file it either floats between throwing an error saying "The given assembly name or codebase was invalid" or by loading fine and never hitting the emit method inside the custom sink. Below is the custom sink cs file:

namespace Moneyfacts.ConsumerSite.Utility
{
    public class ExceptionReportingSink : ILogEventSink
    {
        IFormatProvider _formatProvider;

        public ExceptionReportingSink(IFormatProvider formatProvider)
        {
            _formatProvider = formatProvider;
        }

        public void Emit(LogEvent logEvent)
        {
            if (logEvent.Level == LogEventLevel.Error || logEvent.Level == LogEventLevel.Fatal)
            {
                string serviceUrl = WebConfigurationManager.AppSettings["ExceptionsWebService"];

                var exception = new
                {
                    Message = logEvent.Exception.InnerException != null ? logEvent.Exception.InnerException.Message : logEvent.Exception.Message,
                    ServerName = ConfigurationManager.AppSettings.Get("serverName"),
                    Application = "Consumer Site",
                    Date = DateTime.Now,
                    Severity = "Error",
                };

                ReportException(exception, serviceUrl);
            }
        }

        public void ReportException(object exception, string serviceUrl)
        {
            var request = WebRequest.Create(serviceUrl + "/exceptions/LogException");
            request.Method = "POST";
            request.ContentType = "application/json";
            byte[] byteArray = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(exception));
            request.ContentLength = byteArray.Length;

            //don't wrap this in try/catch - it will be picked up at application level anyway
            using (Stream dataStream = request.GetRequestStream())
            {
                dataStream.Write(byteArray, 0, byteArray.Length);
                dataStream.Close();
            }
            request.GetResponseAsync();
        }
    }
}

I've lost track of the amount of serilog.user.config options that i've tried to implement to get it working,

in various different combinations i've tried the following and none of them have worked successfully (Umbraco 8 is the temporary project name):

<add key="serilog:using:ExceptionReportingSink" value="Moneyfacts.Utility.ExceptionReportingSink, Umbraco8" />
<add key="serilog:write-to:ExceptionReportingSink" value="Moneyfacts.ConsumerSite.Utility.ExceptionReportingSink, Umbraco8" />
<add key="serilog:write-to:ExceptionReportingSink" value="Moneyfacts.ConsumerSite.Utility.ExceptionReportingSink" />
<add key="serilog:write-to:ExceptionReportingSink" />

I tried implementing the Serilog.Sinks.Http package as an alternative solution but I couldn't get it to use that either. If I stick the sample code for "Writing your own log messages to a custom file" from https://our.umbraco.com/documentation/reference/config/Serilog/

into the serilog.user.config file then it picks up the changes fine and logs to the correct place.

Can anyone point out where i'm going wrong/what else I need to do?

Thanks in advance