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C# Program to count the number of lines in a file
Firstly, create a file using StreamWriter class and add content to it −
using (StreamWriter sw = new StreamWriter("hello.txt")) { sw.WriteLine("This is demo line 1"); sw.WriteLine("This is demo line 2"); sw.WriteLine("This is demo line 3"); }
Now use the ReadAllLines() method to read all the lines. With that, the Length property is to be used to get the count of lines −
int count = File.ReadAllLines("hello.txt").Length;
Here is the complete code −
Example
using System; using System.Collections.Generic; using System.IO; public class Program { public static void Main() { using (StreamWriter sw = new StreamWriter("hello.txt")) { sw.WriteLine("This is demo line 1"); sw.WriteLine("This is demo line 2"); sw.WriteLine("This is demo line 3"); } int count = File.ReadAllLines("hello.txt").Length; Console.WriteLine("Number of lines: "+count); } }
Output
Number of lines: 3
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