How do you split a large file into multiple smaller files based on size?

Question

ICSM Computer · Answer

To split a large file into multiple smaller files based on size in C#, you can:
Read the large file in chunks.Write each chunk to a new file when the size limit is reached.
Example: Split File by Size in MB
using System;
using System.IO;
class FileSplitter
{
    public static void SplitFile(string inputFile, string outputDir, int maxSizeInMB)
    {
        const int bufferSize = 1024 * 1024; // 1 MB
        byte[] buffer = new byte[bufferSize];
        int partNumber = 1;
        long maxBytesPerFile = maxSizeInMB * 1024L * 1024L;
        using FileStream sourceStream = new FileStream(inputFile, FileMode.Open, FileAccess.Read);
        Directory.CreateDirectory(outputDir);
        while (sourceStream.Position andlt; sourceStream.Length)
        {
            string partFileName = Path.Combine(outputDir, $"{Path.GetFileNameWithoutExtension(inputFile)}.part{partNumber}{Path.GetExtension(inputFile)}");
            using FileStream partStream = new FileStream(partFileName, FileMode.Create, FileAccess.Write);
            long bytesWritten = 0;
            while (bytesWritten andlt; maxBytesPerFile andand sourceStream.Position andlt; sourceStream.Length)
            {
                int bytesToRead = (int)Math.Min(bufferSize, maxBytesPerFile - bytesWritten);
                int bytesRead = sourceStream.Read(buffer, 0, bytesToRead);
                partStream.Write(buffer, 0, bytesRead);
                bytesWritten += bytesRead;
            }
            Console.WriteLine($"Created: {partFileName}");
            partNumber++;
        }
    }
}
Usage
FileSplitter.SplitFile("largefile.zip", "output", 10); // Split into 10 MB parts
Notes
This example uses binary splitting, suitable for any file type.Files are named like largefile.part1.zip, largefile.part2.zip, etc.To merge them later, you'd read them in order and write to a single file.
Read More
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How do you split a large file into multiple smaller files based on size?

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1 Answers

Example: Split File by Size in MB

Usage

Notes

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