Copy a directory to a different drive

Question

How do I copy a directory to a different drive in C#?

Answer 1

Here's an approach that copies a directory recursively as an async function:

public static async Task CopyDirectoryAsync(string sourceDirectory, string destinationDirectory)
{
    if (!Directory.Exists(destinationDirectory))
        Directory.CreateDirectory(destinationDirectory);

    foreach (var file in Directory.GetFiles(sourceDirectory))
    {
        var name = Path.GetFileName(file);
        var dest = Path.Combine(destinationDirectory, name);
        await CopyFileAsync(file, dest);
    }

    foreach (var subdir in Directory.GetDirectories(sourceDirectory))
    {
        var name = Path.GetFileName(subdir);
        var dest = Path.Combine(destinationDirectory, name);
        await CopyDirectoryAsync(subdir, dest);
    }
}

public static async Task CopyFileAsync(string sourceFile, string destinationFile)
{
    using (var sourceStream = new FileStream(sourceFile, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.Asynchronous | FileOptions.SequentialScan))
    using (var destinationStream = new FileStream(destinationFile, FileMode.CreateNew, FileAccess.Write, FileShare.None, 4096, FileOptions.Asynchronous | FileOptions.SequentialScan))
        await sourceStream.CopyToAsync(destinationStream);
}