复制一个文件到另一个文件夹下

using System.IO;

public void creatPicPath()
        {
            string dirPath = HttpContext.Current.Server.MapPath("ChartImages");
            string dirPathNew = Request.ServerVariables["APPL_PHYSICAL_PATH"] + "PrintOut\\newImg";

            if (Directory.Exists(dirPath))
            {
                //获得目录信息
                DirectoryInfo dir = new DirectoryInfo(dirPath);
                //获得目录文件列表
                FileInfo[] files = dir.GetFiles("*.png");
                string[] fileNames = new string[files.Length];
                int i = 0;
                foreach (FileInfo fileInfo in files)
                {
                    fileNames[i] = fileInfo.Name;
                    i++;
                    string fileName = fileInfo.Name;
                    string targetPath = dirPathNew;//复制同样一个文件放在待上传的目录下
                    if (!System.IO.Directory.Exists(targetPath))
                    {
                        System.IO.Directory.CreateDirectory(targetPath);
                    }
                    else
                    {
                        string sourceFile = System.IO.Path.Combine(dirPath, fileName);
                        string destFile = System.IO.Path.Combine(targetPath, fileName);
                        //获得目录信息
                        DirectoryInfo dirNew = new DirectoryInfo(dirPathNew);
                        //获得目录文件列表
                        FileInfo[] filesNew = dirNew.GetFiles("*.png");
                        string[] fileNamesNew = new string[filesNew.Length];
                        int ii = 0;
                        foreach (FileInfo fileInfoNew in filesNew)
                        {
                            fileNamesNew[ii] = fileInfoNew.Name;
                            System.IO.File.Delete(destFile);
                            ii++;
                        }
                        System.IO.File.Copy(sourceFile, destFile, true);
                    }
                }

            }
        }