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我有一个.dll文件位于我的项目所在的另一个文件夹中。我将此库的引用添加到我的项目中,然后当我尝试使用(导入)它时,using QRlib;我得到以下信息:The type or namespace name 'QRlib' could not be found(are you missing a using directive or an assembly reference?)