La copie des fichiers et sous-répertoires d'un répertoire avec des fichiers existants

J'ai eu cet exemple à partir de msdn http://msdn.microsoft.com/en-us/library/cc148994.aspx je pense que c'est ce que vous cherchez

//To copy all the files in one directory to another directory. 
    //Get the files in the source folder. (To recursively iterate through 
    //all subfolders under the current directory, see 
    //"How to: Iterate Through a Directory Tree.")
    //Note: Check for target path was performed previously 
    //      in this code example. 
    if (System.IO.Directory.Exists(sourcePath))
    {
        string[] files = System.IO.Directory.GetFiles(sourcePath);

        //Copy the files and overwrite destination files if they already exist. 
        foreach (string s in files)
        {
            //Use static Path methods to extract only the file name from the path.
            fileName = System.IO.Path.GetFileName(s);
            destFile = System.IO.Path.Combine(targetPath, fileName);
            System.IO.File.Copy(s, destFile, true);
        }
    }
    else
    {
        Console.WriteLine("Source path does not exist!");
    }

Si vous avez besoin de traiter avec les non existant chemin d'accès au dossier, vous devez créer un nouveau dossier

if (System.IO.Directory.Exists(targetPath){
    System.IO.Directory.CreateDirectory(targetPath);
}

Cela aidera à vous, c'est un générique de fonction récursive, il faut donc toujours fusionné sous-dossiers ainsi.

    ///<summary>
///Directories the copy.
///</summary>
///<param name="sourceDirPath">The source dir path.</param>
///<param name="destDirName">Name of the destination dir.</param>
///<param name="isCopySubDirs">if set to <c>true</c> [is copy sub directories].</param>
///<returns></returns>
public static void DirectoryCopy(string sourceDirPath, string destDirName, bool isCopySubDirs)
{
//Get the subdirectories for the specified directory.
DirectoryInfo directoryInfo = new DirectoryInfo(sourceDirPath);
DirectoryInfo[] directories = directoryInfo.GetDirectories();
if (!directoryInfo.Exists)
{
throw new DirectoryNotFoundException("Source directory does not exist or could not be found: "
+ sourceDirPath);
}
DirectoryInfo parentDirectory = Directory.GetParent(directoryInfo.FullName);
destDirName = System.IO.Path.Combine(parentDirectory.FullName, destDirName);
//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 = directoryInfo.GetFiles();
foreach (FileInfo file in files)
{
string tempPath = System.IO.Path.Combine(destDirName, file.Name);
if (File.Exists(tempPath))
{
File.Delete(tempPath);
}
file.CopyTo(tempPath, false);
}
//If copying subdirectories, copy them and their contents to new location using recursive  function. 
if (isCopySubDirs)
{
foreach (DirectoryInfo item in directories)
{
string tempPath = System.IO.Path.Combine(destDirName, item.Name);
DirectoryCopy(item.FullName, tempPath, isCopySubDirs);
}
}
}