问题一：
Cannot execute text selection: CS0009 Metadata file 'C:\Users\Kimisme\Documents\LINQPad Plugins\Framework 4.6\MyExtensions.FW46.dll' could not be opened -- PE image doesn't contain managed metadata.
处理：
进入目录：C:\Users\Kimisme\Documents\LINQPad Plugins\Framework 4.6,
然后删除文件【MyExtensions.FW46.dll，MyExtensions.FW46.pdb】