How Can I Chunkify a String into Custom-Sized Segments in C#?

Efficiently Splitting Strings into Custom-Sized Chunks in C#

This article demonstrates a C# method for dividing a string into smaller, equally sized segments. Imagine you have a long string:

string longString = "1111222233334444";

And you need to break it into chunks of a specific length, say 4 characters each. The desired output would be:

<code>"1111"
"2222"
"3333"
"4444"</code>

The Solution: A Clean and Concise Approach

The most efficient way to achieve this is using LINQ's Enumerable.Range and Select methods:

static IEnumerable<string> ChunkifyString(string str, int chunkSize)
{
    if (string.IsNullOrEmpty(str) || chunkSize <= 0)
    {
        yield break; // Handle null, empty, or invalid chunk size
    }

    for (int i = 0; i < str.Length; i += chunkSize)
    {
        yield return str.Substring(i, Math.Min(chunkSize, str.Length - i));
    }
}

This improved method uses a for loop and yield return for better performance, especially with very large strings. It also explicitly handles null or empty input strings and non-positive chunk sizes, making it more robust. The Math.Min function ensures that the last chunk doesn't exceed the string's remaining length.

Usage Example:

string myString = "111122223333444455";
int chunkSize = 4;

foreach (string chunk in ChunkifyString(myString, chunkSize))
{
    Console.WriteLine(chunk);
}

This will output:

<code>1111
2222
3333
4444
55</code>

This approach elegantly handles strings whose lengths are not perfectly divisible by the chunk size, ensuring all characters are included in the resulting chunks. This solution is both concise and efficient, making it ideal for various string manipulation tasks.

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