search text file using c# and display the line number and the complete line that contains the search keyword

Question

I require help to search a text file (log file) using c# and display the line number and the complete line that contains the search keyword.

Answer 1

This is a slight modification from: http://msdn.microsoft.com/en-us/library/aa287535%28VS.71%29.aspx

int counter = 0;
string line;

// Read the file and display it line by line.
System.IO.StreamReader file = new System.IO.StreamReader("c:\\test.txt");
while((line = file.ReadLine()) != null)
{
    if ( line.Contains("word") )
    {
        Console.WriteLine (counter.ToString() + ": " + line);
    }

   counter++;
}

file.Close();

Answer 2

i have a project: " create index index on a text file, for creating an index, the user will be requried to specify the name of the file on which the index needs to be created and the name of the index file. if index has already been created on a file, a user should not be required to create it again the next time an operation is to performed on the file.. and load the files by index file i'm learn programming in C#, 3 months ago this project required write in windowapplication. help me! thanks so much