Hi,
读取PDF文件，我们通常借助Adobe Reader控件（安装Adobe ）
https://www.codeproject.com/Articles/380019/Using-Adobe-Reader-in-a-WPF-app
其他第三方库：
ITextSharp： iText是一个PDF库，允许您以便携式文档格式（PDF）创建，修改，检查和维护文档。
https://github.com/itext/itextsharp
随笔分类 - iTextSharp
http://www.cnblogs.com/CareySon/category/332146.html
Free Spire.PDF for .NET
https://www.e-iceblue.com/Introduce/free-pdf-component.html#.WVSvbtG-uM9
Spire.Pdf 的各种操作总结
http://blog.csdn.net/eiceblue/article/details/43792703
Telerik RadPdfViewer（收费控件）
http://docs.telerik.com/devtools/wpf/controls/radpdfviewer/document-model/radfixeddocument
PDF Viewer Control Without Acrobat Reader Installed（VB）
https://www.codeproject.com/Articles/37458/PDF-Viewer-Control-Without-Acrobat-Reader-Installe
Best Regards，
Bob
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