Reading from a textfile and writing to another textfile

Yaseen Staggie

I have Data in Notepad that looks like this
and im writing it to an output file
01 some Data
02 some Data
02 some data
03 some data(End of client 1)
01 some data
02 some data
02 some data
02 some data
03 some data(End of client 2)

I wana count howmany times the value 02 appears and display it after The end of each client
Im using this piece of code to count (
int count = File.ReadLines(@"C:\Exercises\gamenam.dat").Count(line => line.StartsWith("02"));)
I want to know how do you display it after the end of each client?
Can you maybe guide me how to this?

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes12y ago
I assume you want to count the number of occurrences of "02" within each client rather than the cumulative total so far.

If so, try this code:

using System;
using System.IO;

class Program
{
static void Main()
{
string[] lines = File.ReadAllLines("textfile1.txt");

using (StreamWriter sw = new StreamWriter("textfile2.txt"))
{
int count = 0;
foreach(string line in lines)
{
sw.WriteLine(line);
if (line.StartsWith("02")) count++;
if(line.Contains("(End of client"))
{
sw.WriteLine(String.Format("02 appears {0} time(s)", count));
count = 0;
}
}
}
}
}

After running this, the contents of textfile2.txt should be:

01 some Data
02 some Data
02 some data
03 some data(End of client 1)
02 appears 2 time(s)
01 some data
02 some data
02 some data
02 some data
03 some data(End of client 2)
02 appears 3 time(s)
James12y ago
This link may lead you in the right direction
http://www.tamarsolutions.co.uk/csharp-intermediate/get-count-of-specific-character-in-string-csharp-method-extension/