cli/C++ how to define cli::array with unmanaged type element?

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C++/CLI

I have a native C/C++ struct

typedef struct 
{ 
... 
} AStruct; 

and in C++/CLI code i define one delegate and one cli array as following

public delegate void UpdateDataDelegate(AStruct% aSt,AStruct% bSt); 
 
cli::Array<AStruct>^ args=gcnew cli::Array<AStruct>(2); // 

complile failed!!!!。

this->Invoke(updateData,args); 

AStruct has many fields and was used by many modules so if i don't like to write a mananged wrap for AStruct, how to make above code works?
many thanks