编辑PDF文件与ASP.NET没有关系，那么为什么要这样标记您的问题呢?通过这样做，您将限制可能查看您的问题并提供答案的人数.

PDF文件确实是可编辑的.虽然不容易.您将需要其中一种由某些人编写的库，这些库已经将它们释放了出来.

查找其中之一的最简单方法是学习使用搜索引擎.我建议使用诸如 c#开源pdf编辑器之类的短语，然后从众多建议中选择.

Editing a PDF file has nothing to do with ASP.NET, so why tag your question as such? By doing that you are restricting the number of people who might view your question and provide an answer.

PDF files are indeed editable. Not easily though. You will need one of the libraries written by some kind people who have released them into the wild.

The easiest way to find one of those is to learn to use a search engine. I would suggest using a phrase like c# open source pdf editor and then take your pick from the numerous suggestions.