用C#實現能讀取文字從非txt文件，像Office文件及pdf文件，它也可以取出像html及xml文件中重要部份，適用於開發文件搜尋方面的功能，非常具參考價值-With C# Realization can read text from a non-txt files, like Office documents and pdf files, it also can be removed like html and xml documents an important part of the d