public void Log <TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func <TState, Exception, string> formatter)
{
try
{
using (LoggingContext db = new LoggingContext(dbContextOptions))
{
LogEntry entry = new LogEntry();
entry.Level = logLevel;
entry.Category = categoryName;
entry.EventID = eventId.Id;
entry.Message = formatter(state, exception);
Exception ex = exception;
for (int i = 0; ex != null; i++)
{
LogException logException = new LogException();
logException.Order = i;
logException.Type = ex.GetType().FullName;
logException.Message = ex.Message;
logException.StackTrace = ex.StackTrace;
logException.Source = ex.Source;
logException.HelpLink = ex.HelpLink;
entry.Exceptions.Add(logException);
ex = ex.InnerException;
}
db.Add(entry);
db.SaveChanges();
}
}
catch (Exception ex)
{
Console.WriteLine($"{DateTime.Now} - ERROR: Failed to add log entry to database. ({ex.GetType().FullName}: {ex.Message})");
}
}
/// <summary>Writes a log entry.</summary>
/// <param name="logLevel">Entry will be written on this level.</param>
/// <param name="eventId">Id of the event.</param>
/// <param name="state">The entry to be written. Can be also an object.</param>
/// <param name="exception">The exception related to this entry.</param>
/// <param name="formatter">Function to create a <c>string</c> message of the <paramref name="state" /> and <paramref name="exception" />.</param>
public void Log <TState>(
LogLevel logLevel,
EventId eventId,
TState state,
Exception exception,
Func <TState, Exception, string> formatter)
{
if (!IsEnabled(logLevel))
{
return;
}
if (formatter == null)
{
throw new ArgumentNullException(nameof(formatter));
}
var message = formatter(state, exception);
if (string.IsNullOrEmpty(message))
{
return;
}
if (exception != null)
{
message += Environment.NewLine + exception;
}
LogEntry eventLog = new LogEntry
{
Message = message,
EventId = eventId.Id,
LogLevel = logLevel.ToString(),
DateCreated = DateTime.UtcNow,
DateModified = DateTime.UtcNow
};
_context.Add(eventLog);
_context.SaveChanges();
}
