tbf/AppDiagnostic/DiagnosticLogFormatter.cs

using AppDiagnostic.Logging;
using System;

namespace AppDiagnostic
{
    public static class DiagnosticLogFormatter
    {
        public static string Format(DiagnosticLogEntry entry)
        {
            if (entry == null)
            {
                return string.Empty;
            }

            string level = (entry.Level ?? string.Empty).ToUpperInvariant().PadRight(5);
            string application = string.IsNullOrWhiteSpace(entry.ApplicationName) ? "Unknown" : entry.ApplicationName;
            string logger = entry.LoggerName ?? string.Empty;
            string message = entry.Message ?? string.Empty;
            string exception = string.IsNullOrWhiteSpace(entry.Exception) ? string.Empty : Environment.NewLine + entry.Exception;

            return $"{entry.TimestampUtc.ToLocalTime():yyyy-MM-dd HH:mm:ss.fff}|{level}|{application}[{entry.ProcessId}]|{logger}|{message}{exception}";
        }
    }
}