复制自MSDN:

using System;
using System.IO;

class CopyDir
{
    public static void Copy(string sourceDirectory, string targetDirectory)
    {
        DirectoryInfo diSource = new DirectoryInfo(sourceDirectory);
        DirectoryInfo diTarget = new DirectoryInfo(targetDirectory);

        CopyAll(diSource, diTarget);
    }

    public static void CopyAll(DirectoryInfo source, DirectoryInfo target)
    {
        Directory.CreateDirectory(target.FullName);

        // Copy each file into the new directory.
        foreach (FileInfo fi in source.GetFiles())
        {
            Console.WriteLine(@"Copying {0}\{1}", target.FullName, fi.Name);
            fi.CopyTo(Path.Combine(target.FullName, fi.Name), true);
        }

        // Copy each subdirectory using recursion.
        foreach (DirectoryInfo diSourceSubDir in source.GetDirectories())
        {
            DirectoryInfo nextTargetSubDir =
                target.CreateSubdirectory(diSourceSubDir.Name);
            CopyAll(diSourceSubDir, nextTargetSubDir);
        }
    }

    public static void Main()
    {
        string sourceDirectory = @"c:\sourceDirectory";
        string targetDirectory = @"c:\targetDirectory";

        Copy(sourceDirectory, targetDirectory);
    }

    // Output will vary based on the contents of the source directory.
}

容易得多

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);
    }
}

或者，如果你想走一条艰难的路，为你的微软项目添加一个引用。然后使用下面的代码:

Microsoft.VisualBasic.FileIO.FileSystem.CopyDirectory(fromDirectory, toDirectory);

然而，使用一个递归函数是一个更好的方法，因为它不需要加载VB dll。

试试这个:

Process proc = new Process();
proc.StartInfo.UseShellExecute = true;
proc.StartInfo.FileName = Path.Combine(Environment.SystemDirectory, "xcopy.exe");
proc.StartInfo.Arguments = @"C:\source C:\destination /E /I";
proc.Start();

你的xcopy参数可能会有所不同，但你知道的。

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));
    }
}