C#文件复制

using System.IO;

        /// <summary>
        /// 拷贝文件
        /// </summary>
        /// <param name="sourceDirectoryUrl">源路经</param>
        /// <param name="copyDirectoryUrl">复制路经</param>
        private void CopyDirectory(string sourceDirectoryUrl, string copyDirectoryUrl)
        {

            string folderName = sourceDirectoryUrl.Substring(sourceDirectoryUrl.LastIndexOf("\\") + 1);

            string desfolderdir = copyDirectoryUrl + "\\" + folderName;

            if (copyDirectoryUrl.LastIndexOf("\\") == (copyDirectoryUrl.Length - 1))
            {
                desfolderdir = copyDirectoryUrl + folderName;
            }

            string[] filenames = Directory.GetFileSystemEntries(sourceDirectoryUrl);

            foreach (string file in filenames)// 遍历所有的文件和目录
            {
                if (Directory.Exists(file))// 先当作目录处理如果存在这个目录就递归Copy该目录下面的文件
                {

                    string currentdir = desfolderdir + "\\" + file.Substring(file.LastIndexOf("\\") + 1);
                    if (!Directory.Exists(currentdir))
                    {
                        Directory.CreateDirectory(currentdir);
                    }

                    CopyDirectory(file, desfolderdir);
                }
                else // 否则直接copy文件
                {
                    string srcfileName = file.Substring(file.LastIndexOf("\\") + 1);

                    srcfileName = desfolderdir + "\\" + srcfileName;

                    if (!Directory.Exists(desfolderdir))
                    {
                        Directory.CreateDirectory(desfolderdir);
                    }

                    File.Copy(file, srcfileName, true);

                    MessageBox.Show("文件同步成功！");
                }
            }//foreach 
        }