MAUI: Serilog log file is not creating

Question

I am trying to write all log details to a file and send that to our server using an API. I am using Serilog for this. I did below steps:

Installed Serilog, Serilog.Extensions.Logging and Serilog.Sinks.File.

MAUIProgram.cs added below code:

public static MauiApp CreateMauiApp()
        {
            var builder = MauiApp.CreateBuilder();
            var logDirectory = Path.Combine(FileSystem.Current.AppDataDirectory, "logs");
            var logFilePath = Path.Combine(logDirectory, "log.txt");

            // Ensure the directory exists
            if (!Directory.Exists(logDirectory))
            {
                Directory.CreateDirectory(logDirectory);
            }

            Log.Logger = new LoggerConfiguration()
            .WriteTo.File(
                path: Path.Combine(logDirectory, "log.txt"),
                rollingInterval: RollingInterval.Day,
                retainedFileCountLimit: 7, // Keep logs for the last 7 days
                restrictedToMinimumLevel: Serilog.Events.LogEventLevel.Information
            )
            .CreateLogger();

            // Check if the file is created right after logging configuration
            if (File.Exists(logFilePath))
            {
                Debug.WriteLine($"Log file created: {logFilePath}");
            }
            else
            {
                Debug.WriteLine($"Log file not found at expected location: {logFilePath}");
            }

            // Add Serilog to the logging system
            builder.Logging.AddSerilog();

Here the Directory is creating, but the log.txt file is not creating. I am getting below response in output box:

Log file not found at expected location: /data/user/0/com.companyname.appname/files/logs/log.txt

I did a test log like below in another page like below.

Log.Information("Test log!");

1. Finally I tried reading the log details like below to send it to my server.

var logFilePath = Path.Combine(FileSystem.AppDataDirectory, "logs", "log.txt");
        Debug.WriteLine("Log file location:>" + logFilePath);

        if (File.Exists(logFilePath))
        {
            var logContent = File.ReadAllText(logFilePath);
            Debug.WriteLine("logContent:>>" + logContent);
        }
        else
        {
            Debug.WriteLine("Log file not found.");
        }

Here also I am getting "Log file not found" message in output box. Am I missing anything in this? I want to write all the logs to that file and I need to send it to the server for debugging the real world issues.

Answer 1

Hello,

Serilog, Serilog.Extensions.Logging and Serilog.Sinks.File are third-party tools and not supported on Q&A. Besides the log feature, your main problem is that you cannot find the file in the path.

Please test like the following:

var dicPath = Path.Combine(FileSystem.AppDataDirectory, "logs");
var logFilePath =  Path.Combine(dicPath, "log.txt");
 
  if (!Directory.Exists(dicPath))
  {
      Directory.CreateDirectory(dicPath);
  }
 
  if (File.Exists(logFilePath))
      {// if the file exists, read the content and set new log
      var logContent = File.ReadAllText(logFilePath);
    
      Debug.WriteLine("logContent:>>" + logContent);// just debug the value, it won't write the file, please use File.WriteAllText method to write
      File.WriteAllText(""xxx new log content"", logFilePath);
  }
  else
  {//if the file doesn't exist, create the file and set the log txt
      Debug.WriteLine("Log file not found.");
      File.Create(logFilePath);// if the file is not in the path, create this file
      File.WriteAllText(logFilePath, "1345test");// save text in log.txt
  }

After testing, the text can be written to the file path and can be read. The problem is on the following code:

 Log.Logger = new LoggerConfiguration()
            .WriteTo.File(
                path: Path.Combine(logDirectory, "log.txt"),
                rollingInterval: RollingInterval.Day,
                retainedFileCountLimit: 7, // Keep logs for the last 7 days
                restrictedToMinimumLevel: Serilog.Events.LogEventLevel.Information
            )

Since this is a third-party tool issue, please contact them for further help.

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Update

This issue was solved, refer to - https://stackoverflow.com/questions/79345097/maui-serilog-log-file-is-not-creating

Best Regards,

Wenyan Zhang

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