下面是一个DirectoryInfo的扩展方法。CopyTo(注意overwrite参数):

public static DirectoryInfo CopyTo(this DirectoryInfo sourceDir, string destinationPath, bool overwrite = false)
{
    var sourcePath = sourceDir.FullName;

    var destination = new DirectoryInfo(destinationPath);

    destination.Create();

    foreach (var sourceSubDirPath in Directory.EnumerateDirectories(sourcePath, "*", SearchOption.AllDirectories))
        Directory.CreateDirectory(sourceSubDirPath.Replace(sourcePath, destinationPath));

    foreach (var file in Directory.EnumerateFiles(sourcePath, "*", SearchOption.AllDirectories))
        File.Copy(file, file.Replace(sourcePath, destinationPath), overwrite);

    return destination;
}

比任何代码都好(使用递归扩展DirectoryInfo的方法)

public static bool CopyTo(this DirectoryInfo source, string destination)
    {
        try
        {
            foreach (string dirPath in Directory.GetDirectories(source.FullName))
            {
                var newDirPath = dirPath.Replace(source.FullName, destination);
                Directory.CreateDirectory(newDirPath);
                new DirectoryInfo(dirPath).CopyTo(newDirPath);
            }
            //Copy all the files & Replaces any files with the same name
            foreach (string filePath in Directory.GetFiles(source.FullName))
            {
                File.Copy(filePath, filePath.Replace(source.FullName,destination), true);
            }
            return true;
        }
        catch (IOException exp)
        {
            return false;
        }
    }

public static class Extensions
{
    public static void Copy(this DirectoryInfo self, DirectoryInfo destination, bool recursively)
    {
        foreach (var file in self.GetFiles())
        {
            file.CopyTo(Path.Combine(destination.FullName, file.Name));
        }

        if (recursively)
        {
            foreach (var directory in self.GetDirectories())
            {
                directory.Copy(destination.CreateSubdirectory(directory.Name), recursively);
            }
        }
    }
}

使用示例:

var sourceDirectory = new DirectoryInfo(@"C:\source");
var destinationDirectory = new DirectoryInfo(@"C:\destination");

if (destinationDirectory.Exists == false)
{
    sourceDirectory.Copy(destinationDirectory, recursively: true);
}

下面的代码是微软建议如何复制目录 由亲爱的@iato分享 但是它只是递归地复制源文件夹的子目录和文件，而不复制源文件夹本身(如右键单击->复制)。

但在这个答案下面有一个棘手的方法:

private static void DirectoryCopy(string sourceDirName, string destDirName, bool copySubDirs = true)
        {
            // Get the subdirectories for the specified directory.
            DirectoryInfo dir = new DirectoryInfo(sourceDirName);

            if (!dir.Exists)
            {
                throw new DirectoryNotFoundException(
                    "Source directory does not exist or could not be found: "
                    + sourceDirName);
            }

            DirectoryInfo[] dirs = dir.GetDirectories();
            // If the destination directory doesn't exist, create it.
            if (!Directory.Exists(destDirName))
            {
                Directory.CreateDirectory(destDirName);
            }

            // Get the files in the directory and copy them to the new location.
            FileInfo[] files = dir.GetFiles();
            foreach (FileInfo file in files)
            {
                string temppath = Path.Combine(destDirName, file.Name);
                file.CopyTo(temppath, false);
            }

            // If copying subdirectories, copy them and their contents to new location.
            if (copySubDirs)
            {
                foreach (DirectoryInfo subdir in dirs)
                {
                    string temppath = Path.Combine(destDirName, subdir.Name);
                    DirectoryCopy(subdir.FullName, temppath, copySubDirs);
                }
            }
        }

如果你想递归复制源文件夹和子文件夹的内容，你可以像这样简单地使用它:

string source = @"J:\source\";
string dest= @"J:\destination\";
DirectoryCopy(source, dest);

但是如果你想复制源目录自己(类似于你右键单击源文件夹，然后单击复制，然后在目标文件夹中单击粘贴)，你应该像这样使用:

 string source = @"J:\source\";
 string dest= @"J:\destination\";
 DirectoryCopy(source, Path.Combine(dest, new DirectoryInfo(source).Name));

对于d4nt的答案有一个小的改进，因为如果你在服务器和开发机器上工作，你可能想检查错误，而不必更改xcopy路径:

public void CopyFolder(string source, string destination)
{
    string xcopyPath = Environment.GetEnvironmentVariable("WINDIR") + @"\System32\xcopy.exe";
    ProcessStartInfo info = new ProcessStartInfo(xcopyPath);
    info.UseShellExecute = false;
    info.RedirectStandardOutput = true;
    info.Arguments = string.Format("\"{0}\" \"{1}\" /E /I", source, destination);

    Process process = Process.Start(info);
    process.WaitForExit();
    string result = process.StandardOutput.ReadToEnd();

    if (process.ExitCode != 0)
    {
        // Or your own custom exception, or just return false if you prefer.
        throw new InvalidOperationException(string.Format("Failed to copy {0} to {1}: {2}", source, destination, result));
    }
}

它可能没有性能意识，但我用它来处理30MB的文件夹，它工作得完美无缺。另外，我不喜欢这么简单的任务所需要的大量代码和递归。

var src = "c:\src";
var dest = "c:\dest";
var cmp = CompressionLevel.NoCompression;
var zip = source_folder + ".zip";

ZipFile.CreateFromDirectory(src, zip, cmp, includeBaseDirectory: false);
ZipFile.ExtractToDirectory(zip, dest_folder);

File.Delete(zip);

注意:ZipFile可以在。net 4.5+的System.IO.Compression命名空间中使用