速记一些小知识点。
常用代码段

[Transaction(TransactionMode.Automatic)]
[Regeneration(RegenerationOption.Automatic)]
public class HelloWorld : IExternalCommand
{
    
public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
    {
        UIApplication uiApp 
= commandData.Application;
        Document doc 
= uiApp.ActiveUIDocument.Document;
        Selection sel 
= uiApp.ActiveUIDocument.Selection;
    }
}

end

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