Engine中如何设置pagelayout上的多个数据框的地图显示比例mapscale?

double presetscale; 

string path; 

IMapDocument mapDocument = new MapDocumentClass(); 

mapDocument.Open(path, ); 



//set first map scale 

IPageLayout pageLayout = mapDocument.PageLayout; 

IActiveView activeView = (IActiveView)pageLayout; 

IMap map = activeView.FocusMap; 



activeView = (IActiveView)mapDocument.PageLayout; 

activeView.Activate(GetDesktopWindow()); 



map.MapScale = presetscale; 

activeView.Refresh(); 



//set next map scale 

pageLayout.FocusNextMapFrame(); 

pageLayout = mapDocument.PageLayout; 

activeView = (IActiveView)pageLayout; 

map = activeView.FocusMap; 



activeView = (IActiveView)mapDocument.PageLayout; 

activeView.Activate(GetDesktopWindow()); 



map.MapScale = presetscale; 

activeView.Refresh(); 



mapDocument.Save(true, true);