1、文件：

File.Create(path)

File.Copy(sourceFile,destFile,true);

File.Move(sourceFile,targetFile)

File.Exists(fileName)

File.Delete(fileName)

FileInfo fi = new FileInfo(fileName);

fi.Delete();

2、文件夹：

Directory.CreateDirectory(targetPath);

Directory.Exists(path)

Directory.Delete(path)

Directory.Move(sourcePath, targetPath);

DirectoryInfo di = new DirectoryInfo(path);

di.Delete(true);

3、文件夹拷贝需要遍历，逐个拷贝文件。