Update:
I modified my code with the suggestions above and all went well. It did exactly as I expected.
However, the problem I ran into was the amount of time it took to run the application on a large folder. (containing 6,000 files and 5 sub-folders)
On a small folder, (28 files in 5 sub-folders) it only took a few seconds to run. But, on the larger folder it took 35 minutes to process only 1,300 files.
Solution:
The code below will do the same thing but much faster. This new version processed 6,000 files in about 10 seconds. It processed 40,000 files in about 1 minute and 50 seconds.
What this new code does (and doesn’t do)
If the destination folder is empty, copy all from the source to the destination.
If the destination has some or all of the same files / folders as the source, compare and copy any new or modified files from the source to the destination.
If the destination file is newer than the source, don’t copy.
So, here’s the code to make it happen. Enjoy and share.
Thanks to everyone who helped me get a better understanding of this.
using System;
using System.IO;
namespace VSU1vFileCopy
{
class Program
{
static void Main(string[] args)
{
const string Src_FOLDER = @"C:\Data";
const string Dest_FOLDER = @"E:\Data";
string[] originalFiles = Directory.GetFiles(Src_FOLDER, "*", SearchOption.AllDirectories);
Array.ForEach(originalFiles, (originalFileLocation) =>
{
FileInfo originalFile = new FileInfo(originalFileLocation);
FileInfo destFile = new FileInfo(originalFileLocation.Replace(Src_FOLDER, Dest_FOLDER));
if (destFile.Exists)
{
if (originalFile.Length > destFile.Length)
{
originalFile.CopyTo(destFile.FullName, true);
}
}
else
{
Directory.CreateDirectory(destFile.DirectoryName);
originalFile.CopyTo(destFile.FullName, false);
}
});
}
}
}