To Write to the Trace Log from the Code

When you are developing and troubleshooting the customization code, you may need to know what happens during code execution (for example, an action being called or an event being raised). You can write information to the trace log directly from your code by using one of the following approaches:

• Using the methods of the ILogger<T> interface, which is provided by Microsoft
• Using the methods of the PXTrace static class

A user can see the log message in the trace log if the user clicks Tools > Trace on the form title bar after the corresponding logic has been executed.

Writing to the Trace Log by Using the Methods of ILogger<T>

MYOB Acumatica supports the logging mechanism provided by the Microsoft.Extensions.Logging.Abstractions NuGet package. You can use this mechanism in custom code to write to the trace log.

To use this mechanism, you should do the following:

1. Install the Microsoft.Extensions.Logging.Abstractions NuGet package to the Visual Studio project that contains custom code.
2. Add the following using directive to the code file that contains the logic for which you need to write to the log.

   using Microsoft.Extensions.Logging;

3. In the graph that executes the logic, add a property of the ILogger<T> type, and assign the InjectDependency attribute to the property, as shown in the following example. Use the graph as the type parameter.
   Tip: For details about the InjectDependency attribute, see Dependency Injection.

   public class RSSVWorkOrderEntry : PXGraph<RSSVWorkOrderEntry, RSSVWorkOrder>
   {
       //Other code of the graph
   
       //The logger
       [InjectDependency]
       private ILogger<RSSVWorkOrderEntry> MyLogger { get; set; }
   }

4. In the code for which you need to write to the log, such as in an action of the graph, call the methods of the ILogger<T> interface to write to the trace log. For details about the methods of the interface, see ILogger<TCategoryName> Interface in the Microsoft documentation. The following example shows the call of the LogInformation method.

   public class RSSVWorkOrderEntry : PXGraph<RSSVWorkOrderEntry, RSSVWorkOrder>
   {
       //Other code of the graph
   
       //The logger
       [InjectDependency]
       private ILogger<RSSVWorkOrderEntry> MyLogger { get; set; }
   
       //A method in the graph
       public void AssignOrder(RSSVWorkOrder order)
       {
           //Implementation of the method
           
           //Writing to the log
           MyLogger.LogInformation(
               "The {OrderNbr} work order has been assigned.", order.OrderNbr);
       }
   }

   Note: Do not use string formatting inside the log messages, as is shown in the following code example.

   MyLogger.LogInformation(
       string.Format("The {0} work order has been assigned.", order.OrderNbr));
   MyLogger.LogInformation(
       $"The {order.OrderNbr} work order has been assigned."));

Writing to the Trace Log by Using the Methods of PXTrace

You can write information to the trace log directly from your code by using the following methods of the PXTrace static class:

• public static void WriteError(string message)
• public static void WriteError(Exception e)
• public static void WriteWarning(string message)
• public static void WriteWarning(Exception e)
• public static void WriteInformation(string message)
• public static void WriteInformation(Exception e)
• public static void WriteVerbose(string message)

To manage writing information to the trace log, you can use the following methods of the PXTrace static class:

• public static Serilog.ILogger WithStack()
  By default, the stack trace is not collected so that the project does not impair system performance. To turn on the collection of the stack trace, call the WithStack method, as the following code example shows. Note that in the presented code, the stack trace is collected only if the appropriate logging level has been set up.

  PXTrace.WithStack().Information(“some info”);

• public static Serilog.ILogger WithSourceLocation()

The WithStack and WithSourceLocation methods can be chained with Serilog.ILogger methods.

Adding a Log Method to the Published Customization Code

If you want to avoid changes in the customization project, you can add this method to the customization code that has already been applied to the application instance. To do this, perform the following actions:

1. Make sure that the customization project that contains the code you are debugging has been published. If the project is unpublished, publish it, as described in Publishing Customization Projects.
2. Launch Microsoft Visual Studio.
3. In Visual Studio, open the file with the code that is currently saved in the App_RuntimeCode website folder.
4. Add a call of one of the methods listed above to the appropriate code sample.
5. Save your changes to the file.
6. In the browser, open or refresh the form that you are troubleshooting.
7. On the form, perform the sequence of actions that invokes the changed code.
8. Click Tools > Trace to open the MYOB Trace page.
9. On the page, explore the trace log to make sure that the changed code sample has been executed.

Specifying the Logging Level

Events that you log in code have different logging levels. You can specify a logging level in web.config so that only events up to that level will be logged. You set up the logging level by using the following settings in the web.config file:

• system.web/pxtrace/@minimumLevel: An indicator of the overall minimum level of severity of events that can be logged by the providers defined in the pxtrace section.
• system.web/pxtrace/add/@minimumLevel: An indicator of the minimum level of severity of events that a particular provider in the pxtrace section must log. For example, you can specify a different level of severity for a provider that saves log messages to a file.

The logging levels are the following: Fatal, Error, Warning, Information, Debug, Verbose. By default, the Verbose level is specified.