C# – Copy directory with all files and folders

cnet

I'm trying to copy one directory to another path.
I found this method, but it does not copy the directory, only the sub-directories and files inside it:

string sourcedirectory = Environment.ExpandEnvironmentVariables("%AppData%\\Program");

foreach (string dirPath in Directory.GetDirectories(sourcedirectory, "*", SearchOption.AllDirectories))
{
    Directory.CreateDirectory(dirPath.Replace(sourcedirectory, folderDialog.SelectedPath));
}
foreach (string newPath in Directory.GetFiles(sourcedirectory, "*.*", SearchOption.AllDirectories))
{
    File.Copy(newPath, newPath.Replace(sourcedirectory, folderDialog.SelectedPath), true);
}

How I can get the "Program" folder in output with all files and sub-folders?

Best Answer

If you adjust the output path before you start copying, it should work:

string sourcedirectory = Environment.ExpandEnvironmentVariables("%AppData%\\Program");

folderDialog.SelectedPath = Path.Combine(folderDialog.SelectedPath,
    Path.GetFileName(sourcedirectory));

foreach (string dirPath in Directory.GetDirectories(sourcedirectory, "*", SearchOption.AllDirectories))
{
    Directory.CreateDirectory(dirPath.Replace(sourcedirectory, folderDialog.SelectedPath));
}
foreach (string newPath in Directory.GetFiles(sourcedirectory, "*.*", SearchOption.AllDirectories))
{
    File.Copy(newPath, newPath.Replace(sourcedirectory, folderDialog.SelectedPath), true);
}

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C# – Copy the entire contents of a directory in C#

Much easier

private static void CopyFilesRecursively(string sourcePath, string targetPath)
{
    //Now Create all of the directories
    foreach (string dirPath in Directory.GetDirectories(sourcePath, "*", SearchOption.AllDirectories))
    {
        Directory.CreateDirectory(dirPath.Replace(sourcePath, targetPath));
    }

    //Copy all the files & Replaces any files with the same name
    foreach (string newPath in Directory.GetFiles(sourcePath, "*.*",SearchOption.AllDirectories))
    {
        File.Copy(newPath, newPath.Replace(sourcePath, targetPath), true);
    }
}

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I would use First() when I know or expect the sequence to have at least one element. In other words, when it is an exceptional occurrence that the sequence is empty.

Use FirstOrDefault() when you know that you will need to check whether there was an element or not. In other words, when it is legal for the sequence to be empty. You should not rely on exception handling for the check. (It is bad practice and might hurt performance).

Finally, the difference between First() and Take(1) is that First() returns the element itself, while Take(1) returns a sequence of elements that contains exactly one element.

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C# – Copy the entire contents of a directory in C#

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