获取程序对象
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```## 打开文件1、打开方式```C#swApp.OpenDoc(filename, (int)swDocumentTypes_e.swDocPART); //Fun(文件路径,文件类型):
2、激活当前文件:
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PartDoc swPart = (AssemblyDoc)swApp.ActiveDoc;//类型1:零件AssemblyDoc swAssy = (AssemblyDoc)swApp.ActiveDoc; //类型2:装配体DrawingDoc swDraw = (AssemblyDoc)swApp.ActiveDoc; //类型3:工程图