建立自定義目標

using NLog;
using NLog.Config;
using NLog.Targets;

namespace MyNamespace 
{ 
    
    [Target("MyFirst")] 
    public sealed class MyFirstTarget: TargetWithLayout  //or inherit from Target
    { 
        public MyFirstTarget()
        {
            //set defaults
            this.Host = "localhost";
        }

        [RequiredParameter] 
        public string Host { get; set; }

        protected override void Write(LogEventInfo logEvent) 
        { 
            string logMessage = this.Layout.Render(logEvent); 

            //TODO write to target
        } 
    } 
}

以 MyFirst 的名義註冊 - 儘快 - 例如在 main()，application_start()。

ConfigurationItemFactory
          .Default
          .Targets
          .RegisterDefinition("MyFirst", typeof(MyNamespace.MyFirstTarget));

用法：

<?xml version="1.0" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

    <targets>
       <target name="target1" type="MyFirst" Host="somehost.com" />
    </targets>

    <rules>
        <logger name="*" minlevel="Debug" writeTo="target1" />
    </rules>
</nlog>