一个DATAGRID打印的类，我们在编程的时候经常会遇到用户需要将界面展示的东西打印出来，程序员往往要手工写打印代码，现在不用拉。-a print category, we in the program often encountered when users need to display interface to print out something, programmers often have to manually write Print code, are exempt from Rafah.