How Can I Efficiently Count Lines in a C# Text File?

C# text file line count counting method

Counting the number of lines in a text file is a common programming task. This article will explore several ways to achieve this in C#.

• Use the ReadAllLines() method:

<code class="language-csharp">var lineCount = File.ReadAllLines(@"C:\file.txt").Length;</code>

This method reads all lines into an array, which is more efficient for small files. However, for large files, it can consume a lot of memory.

• Use the ReadLine() method to combine counters:

<code class="language-csharp">var lineCount = 0;
using (var reader = File.OpenText(@"C:\file.txt"))
{
    while (reader.ReadLine() != null)
    {
        lineCount++;
    }
}</code>

This method reads the file line by line and increments the counter. It is more memory efficient, but may be slower for very large files.

• Use the ReadLines() and Count() methods (.NET 4.0 and above):

<code class="language-csharp">var lineCount = File.ReadLines(@"C:\file.txt").Count();</code>

This method (available in .NET 4.0 and above) delays enumeration without loading the entire file into memory. It strikes a balance between efficiency and memory usage.

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