Configuration sample issue about serilog-settings-xml

[rsabirov]

@simmotech thank you for reasing issue with sample config. I fixed that.

For second part, I am not sure that I understand what you mean here. May be you can send me PR?

[simmotech]

Your code insists that the xml resides in its own file; I was suggesting that with a minor tweak, it could read the same xml from app.config:

<?xml version="1.0" encoding="utf-8"?>
<configuration>

  <configSections>
    <section name="serilog" type="<some simple config section handler>" />
  </configSections>

  <serilog>

    <using>
      <!--
      <add name="Serilog.Enrichers.Thread" />
      <add name="Serilog.Enrichers.Process" />
      <add name="Serilog.Enrichers.Environment" />
    -->
      <add name="Serilog.Sinks.File" />
    </using>

    <enrich>
      <!-- <enricher name="FromLogContext" /> -->
      <!-- <enricher name="WithMachineName" /> -->
      <!-- <enricher name="WithThreadId" /> -->
      <!-- <enricher name="WithProcessId" /> -->
      <!-- <enricher name="WithEnvironmentUserName" /> -->
    </enrich>

    <properties>
      <!-- <property name="Application" value="Sample" /> -->
      <!-- <property name="Path" value="%PATH%" /> -->
    </properties>

    <minimumLevel default="Verbose">
      <override name="Microsoft" level="Warning" />
      <override name="Microsoft.AspNetCore.Mvc" level="Error" />
    </minimumLevel>

    <writeTo>
      <sink name="File">
        <arg name="path" value="%ALLUSERSPROFILE%\SmartLibrarian\Logs\Log.txt" />
        <arg name="outputTemplate" value="{Timestamp:yyyy-MM-dd HH:mm:ss.fff} [{Level:u3}] - {SourceContext:c} - {Message:lj}{NewLine}{Exception}" />
      </sink>
    </writeTo>

  </serilog>
</configuration>

This is the simple configuration section handler I used

	public class ConfigurationSectionHandler: IConfigurationSectionHandler
	{
		object IConfigurationSectionHandler.Create(object parent, object configContext, XmlNode section)
		{
			if (parent != null) throw new ConfigurationException("parent configuration sections are not allowed");

			return section;
		}
	}

So if a null filename is supplied, it tries to read it from here instead rather than throwing an exception.