Here is a simple log which has been inspired of Android Log. It logs to ULS which you can open with ULSViewer, SharePoint Log Viewer.
using System;
using Microsoft.SharePoint.Administration;
namespace Contoso.Intranet.Portal.Utilities
{
public class Log
{
private static readonly string \_CATEGORYNAME = "CONTOSO";
private static readonly SPDiagnosticsCategory \_ERROR\_CATEGORY =
new SPDiagnosticsCategory(\_CATEGORYNAME, TraceSeverity.Unexpected, EventSeverity.Error);
private static readonly SPDiagnosticsCategory \_WARNING\_CATEGORY =
new SPDiagnosticsCategory(\_CATEGORYNAME, TraceSeverity.High, EventSeverity.Warning);
private static readonly SPDiagnosticsCategory \_VERBOSE\_CATEGORY =
new SPDiagnosticsCategory(\_CATEGORYNAME, TraceSeverity.Verbose, EventSeverity.Verbose);
private static readonly SPDiagnosticsCategory \_INFO\_CATEGORY =
new SPDiagnosticsCategory(\_CATEGORYNAME, TraceSeverity.Medium, EventSeverity.Information);
private static void WriteTrace(SPDiagnosticsCategory category, string message, string trace)
{
SPDiagnosticsService.Local.WriteTrace(0, category, category.DefaultTraceSeverity, message, trace);
}
public static void Error(Exception ex)
{
WriteTrace(\_ERROR\_CATEGORY, ex.Message, ex.StackTrace);
}
public static void Warning(string message)
{
WriteTrace(\_WARNING\_CATEGORY, message, "");
}
public static void Verbose(string message)
{
WriteTrace(\_VERBOSE\_CATEGORY, message, "");
}
public static void Info(string message)
{
WriteTrace(\_INFO\_CATEGORY, message, "");
}
}
}
A possible improvement can be a custom Area. See an example of ThorstenHans on Github: CustomLogger.cs EDIT: I found an interesting article: How to log to the SharePoint ULS Logs: Clean Debugging and Error Logging broken down into steps written by Philip Stathis.