記錄找到的resource，如何用C#讀取這些常見檔案格式(三個願望，一次滿足)。
- 讀取PDF
- 1. [C#] 讀取 PDF 檔
2. How to read pdf files using C# .NET
3. Extract Text from PDF in C# (100% .NET) , License: The Code Project Open License (CPOL)
4. Converting PDF to Text in C#, License: The Code Project Open License (CPOL) - 讀取Excel
1. [C#] – 讀取Excel檔案 - 讀取Word
1. Quick Tutorial: How To Read Microsoft Word File in C#
2. Reading a word document using C# - 讀取PowerPoint
1. C#: How to read from Microsoft PowerPoint file ppt
