How to read commented lines of data in log file

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Hi,

I am reading the content of log file using File.ReadAllLines like below

C#

fileContents = File.ReadAllLines( dataLogFile);

There are some commented lines on log file like this:

date Mon Aug 19 05:41:35 pm 2013
base hex timestamps absolute
no internal events logged
// version 7.6.0
// PGN=EF00 SA=B DA=FA
157.692673 1 18EFFA0Bx Rx d 8 01 00 13 DC 00 00 00 00 Length = 282000 BitCount = 145
// PGN=EF00 SA=B DA=FA
157.693679 1 18EFFA0Bx Rx d 8 02 00 00 00 00 00 00 00 Length = 286000 BitCount = 147
// PGN=F004 SA=0 DA=FF EEC1_E
157.693954 1 CF00400x Rx d 8 F4 A8 A9 92 23 FF FF A8 Length = 266000 BitCount = 137
// PGN=EF00 SA=B DA=FA
157.694670 1 18EFFA0Bx Rx d 8 02 00 09 FB 00 00 00 00 Length = 280000 BitCount = 144
// PGN=0 SA=B DA=0 TSC1_100_ABM_REX

I cannot read the commented lines of log file using File.ReadAllLines

I need to read that commented lines for filtering the data

Can anyone suggest me something about this

Thanks
John

Posted 19-Dec-13 3:58am

Member 10408451

Updated 19-Dec-13 4:00am

v2

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BillWoodruff 19-Dec-13 10:09am

Are you saying that: after executing your code to read all the lines, that lines beginning with "//" are not present in the result ?

Christopher Drake 19-Dec-13 10:25am

There are no visible escape characters. You should be able to use ReadAllLines()

5 solutions

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Dave Kreskowiak · Answer 1 · 2013-12-19T04:26:00

ReadAllLines will return all the text in the file. Period. It makes no ditintion about what you think is a comment. There are no such things as comments to File.ReadAllLines.

So, that brings us to the problem being in your procoessing of the file. But, we have no Idea what that code looks like so it's impossible to say what's wrong there.

♥…ЯҠ…♥ · Answer 2 · 2013-12-19T04:04:00

Solution 1

Hi John,

While reading, try to replace // with white space then read the line.
Is it possible to do that?
I dont know just am guessing.

Hope this helps you a bit.

Regards,
RK

Posted 19-Dec-13 4:04am

♥…ЯҠ…♥

Karthik_Mahalingam · Answer 3 · 2013-12-19T04:07:00

Solution 2

Hi Try like this..

C#

var fileContents = File.ReadAllLines(dataLogFile);
        var commentLines = fileContents.Where(k => k.StartsWith("//")).ToArray();

Posted 19-Dec-13 4:07am

Karthik_Mahalingam

Comments

Member 10408451 22-Dec-13 10:53am

Hi,
I tried this. But his code is reading only first line of my log file
I am getting something like this on console
// version 7.6.0
// Trigger number =1

Karthik_Mahalingam 22-Dec-13 22:49pm

not clear. please explain ..

Member 10408451 22-Dec-13 22:55pm

Hi,
fileContents = File.ReadAllLines(seclogPath1);
string[] lineWords = (fileContents[Index].Trim()).Split(spaceSeperator, StringSplitOptions.RemoveEmptyEntries);

I am using the above lines of code to read the data and to split and save my data into string array.

But that data starts with "//" is not present in this

For example:
// PGN=EF00 SA=B DA=FA
How can I read this data???

Karthik_Mahalingam 22-Dec-13 23:38pm

y u r using index ??
fileContents[Index] ???

joginder-banger · Answer 4 · 2013-12-19T04:14:00

Solution 3

try this if you wanted only commented line

C#

string [] my=   File.ReadAllLines(@"Path of file");

         foreach (string item in my)
         {
             if (item.StartsWith("//"))
             {
                 MessageBox.Show(item);
             }
         }

Posted 19-Dec-13 4:14am

joginder-banger

Christopher Drake · Answer 5 · 2013-12-19T04:27:00

From http://msdn.microsoft.com/en-us/library/s2tte0y1(v=vs.110).aspx

C#

using System;
using System.IO;
class Test
{
    public static void Main()
    {
        string path = @"c:\temp\MyTest.txt";

        // This text is added only once to the file.
        if (!File.Exists(path))
        {
            // Create a file to write to.
            string[] createText = { "Hello", "And", "Welcome" };
            File.WriteAllLines(path, createText);
        }

        // This text is always added, making the file longer over time
        // if it is not deleted.
        string appendText = "This is extra text" + Environment.NewLine;
        File.AppendAllText(path, appendText);

        // Open the file to read from.
        string[] readText = File.ReadAllLines(path);
        foreach (string s in readText)
        {
            Console.WriteLine(s);
        }
    }
}