Fastest way to find strings in a file

Question

I have a log file that is not more than 10KB (File size can go up to 2 MB max) and I want to find if atleast one group of these strings occurs in the files. These strings w

Answer 1

Here's one possible way to do it:

StreamReader sr;
string fileContents;

string[] logFiles = Directory.GetFiles(@"C:\Logs");

foreach (string file in logFiles)
{

    using (StreamReader sr = new StreamReader(file))
    {

        fileContents = sr.ReadAllText();

        if (fileContents.Contains("ACTION:") || fileContents.Contains("INPUT:") || fileContents.Contains("RESULT:"))
        {
             // Do what you need to here
        }

    }
}

You may need to do some variation based on your exact implementation needs - for example, what if the word spans two lines, does the line need to start with the word, etc.

Added

Alternate line-by-line check:

StreamReader sr;
string[] lines;

string[] logFiles = Directory.GetFiles(@"C:\Logs");

foreach (string file in logFiles)
{

    using (StreamReader sr = new StreamReader(file)
    {

        lines = sr.ReadAllLines();

        foreach (string line in lines)
        {        
            if (line.Contains("ACTION:") || line.Contains("INPUT:") || line.Contains("RESULT:"))
            {
                // Do what you need to here
            }
        }

    }
}