PDF补丁丁——PDF工具箱，可以编辑书签、剪裁旋转页面、解除限制、提取或合并文档，探查文档结构，提取图片、转成图片等等
Microsoft Automatic Graph Layout
以前写的一个工具demo 1、Sqlite EF6 2、WPF 自定义下拉框控件（多选）、下拉树形控件TreeSelect（多项）
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