提取HTML代码中文字的C#函数在做一些网站（特别是bbs之类）时，经常会有充许用户输入html样式代码，却禁止脚本的运行的需求, 以达到丰富网页样式，禁止恶意代码的运行。-Extraction of HTML code in the C# language function to do at some website (especially bbs like) often will allow the user to enter html code style, but to prohibit