How to read line no in log file reading using C# and ASP.Net

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Hi,
I got one requirement for to read a log files and display it in a grid. But there is also a requirement to read line no in that log file to make bookmarks for future reading. But can any one please help me out how to read/make particular line no in that log file reading using C# and ASP.Net. And one more thing how to make filtration for by giving pattern matching/regex from that log file. Suppose i want to get particular phrase in that log file how to get it using C#,ASP.Net/Jquery. Please help me out its urgent.

Posted 6-Mar-15 4:53am

SanSkun

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Sergey Alexandrovich Kryukov 6-Mar-15 11:02am

It depends on what you use for logging. Look at the documentation on the facility you are using...
—SA

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OriginalGriff · Answer 1 · 2015-03-06T05:02:00

That's a problem: because without knowing the format of the file, you can't "predict" lines.

Text files for example don't have lines: they have line terminators, which means that in order to access "line n" you have to read the file up to that point, counting line terminators as you go. You can read teh whole file, and teh system will convert it to lines for you:

C#

string[] lines = File.ReadAllLines(pathToLogFile);

But you can't say

C#

string myLine = MyStream.ReadLine(1237);

because liens don;t have to be the same length.

If it isn't a text file, it could have any content: and that make it even worse! I've seen XML, database files, DOCX, XLS, CSV, and loads of proprietary formats used for logs in my time.

So the first thing you need to do is look at your log, and work out exactly what format it has, and then you can start looking at means to identify individual log entries. But we can't do that for you!