在VB.net中，此代码可以：
Dim oPS as Object= CreateObject("Photoshop.Application.10")
Dim oDocument as Object= oPS.ActiveDocument
但是在C＃中，此代码会发生错误：
Object oPS = COMCreateObject("Photoshop.Application.10");
Object oDocument = oPS.ActiveDocument;
建立时发生错误
Error 2 'object' does not contain a definition for 'ActiveDocument' and no extension method 'ActiveDocument' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)
如何在C＃（相同的vb.net）中获取对象的子对象？
使用dynamic关键字代替object：
dynamic oPS = COMCreateObject("Photoshop.Application.10");
dynamic oDocument = oPS.ActiveDocument;
MSDN参考在这里：https : //msdn.microsoft.com/en-us/library/dd264736.aspx
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