使用google很容易.在12.4个* MILLION *命中(搜索短语="C#pdf文件")中，这是第二个.第一个是关于CodeProject的文章.

http://csharp-source.net/open-source/pdf-libraries [ ^ ]

Using google is easy. Out of 12.4 *MILLION* hits (search phrase = "C# pdf files"), this one was the 2nd one. The first one was for an article here on CodeProject.

http://csharp-source.net/open-source/pdf-libraries[^]

是否可以在不使用任何第三方工具的情况下实现它或API?

Is it possible to achieve it without using any third-party tools or APIs?

不，当然不是.这就是为什么在MSDN中没有关于PDF名称空间的原因，没有一个.

***的选择是购买图书馆，但是有免费的图书馆可以做这种事情.

No, of course not. That''s why there''s nothing in MSDN about a PDF namespace, there is not one.

Your best bet is to buy a library, but there are free ones that kind of work.

是否可以在不使用任何第三方工具或API的情况下实现这一目标?

Is it possible to achieve it without using any third-party tools or APIs?

理论上是，因为PDF规范是公开可用的[ ^ ].但是，这将是一项艰巨的任务(请参阅文章:"PDF表单解析器" 了解更多信息) ).
:)

Theoretically yes, since the PDF specifications are publically available [^]. It would be a daunting task, however (see the article: "A PDF Forms Parser" for an insight).
:)