MAUI - presenting log file - topp 500 lines

Question

MAUI - presenting log file - topp 500 lines

Dani_S 4,296

HI, I have log file. I want to read the top 500 lines. How it can done efiicency ? How to present in the UI ? In net 8./window. Thanks,

Leon Lu (Shanghai Wicresoft Co,.Ltd.) 81,016 Reputation points Microsoft External Staff

2024-01-19T08:07:41.8233333+00:00

Can you share a sample log? Where is the log stored? Such as C Disk or another Disk?
Dani_S 4,296 Reputation points

2024-01-19T08:15:15.8533333+00:00

In c disk

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Leon Lu (Shanghai Wicresoft Co,.Ltd.) 81,016 Reputation points Microsoft External Staff

2024-01-19T08:07:41.8233333+00:00

Can you share a sample log? Where is the log stored? Such as C Disk or another Disk?
Dani_S 4,296 Reputation points

2024-01-19T08:15:15.8533333+00:00

In c disk

Answer 1

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 49,611 Microsoft External Staff

Hello,

You could use the File.ReadAllLines method to get all the lines in the file as an array first. Then use the method of step changer traversal to read 500 rows at a time and display.

Please refer to the following documentation and sample code:

File.ReadAllLines Method.

int step = 0;
int loglines = 500;
private void OnReadLogClicked(object sender, EventArgs e)
{

    StringBuilder myStringBuilder = new StringBuilder();
    var path = "your log file path";
    var strings = File.ReadAllLines(path);
    if (strings.Length >= loglines)
    {
        foreach (var str in strings.Skip(step).Take(loglines))
        {

            myStringBuilder.AppendLine(str);
            test_label.Text = myStringBuilder.ToString();
        }
        step += loglines;
        loglines += 500;
    }
    else
    {
        foreach (var str in strings.Skip(step))
        {

            myStringBuilder.AppendLine(str);
            test_label.Text = myStringBuilder.ToString();
        }
    }

}

Best Regards,

Alec Liu.

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Dani_S 4,296 Reputation points

2024-01-18T08:19:59.5133333+00:00

I want to show the 500 lines from end of log.

Leon Lu (Shanghai Wicresoft Co,.Ltd.) 81,016 Microsoft External Staff

You can use File.ReadLinesAsync(path), then fill all the logs to the List<string>, then use Linq to read the end of 500 logs, if logs are less than 500 logs, put all records to the List.

You can use List.Reverse to get last 500 logs.

StringBuilder myStringBuilder = new StringBuilder();
  var path = @"c:\test.log";
  CancellationToken cancellationToken=  new CancellationToken();
  List<string> allLogList= new List<string>();    
  await foreach (string item in File.ReadLinesAsync(path))
  {
      allLogList.Add(item);   
  }
  List<string> last500Records= new List<string>();
  int numberOfRecordsToRead = 500;
  if (allLogList.Count >= numberOfRecordsToRead)
  {
      // Use LINQ to get the last 500 records
      last500Records = allLogList.Skip(Math.Max(0, allLogList.Count - numberOfRecordsToRead)).ToList();
     last500Records.Reverse();
  }
  else
  {
      //The list does not contain 500 records. read all
      allLogList.Reverse();
      last500Records = allLogList;
     
  }

Leon Lu (Shanghai Wicresoft Co,.Ltd.) 81,016 Reputation points Microsoft External Staff

2024-01-23T00:50:34.9033333+00:00

דני שטרית May I know if you have got any chance to check my answer? I am glad to help if you have any other questions.
Dani_S 4,296 Reputation points

2024-01-23T14:06:47.02+00:00

I'm checking and let you know.
Leon Lu (Shanghai Wicresoft Co,.Ltd.) 81,016 Reputation points Microsoft External Staff

2024-01-24T01:19:56.64+00:00

Ok, thanks for your update.

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