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I have this function in CLI/managed C++ DLL

void Sim1::GetRes(array<double^,2>^ param1)

And I call this function from C#

 double[,] param1 = new double[1000,2000];

 // fill the param1 array with values
 ...

 Sim1 sim1=new Sim1();
 sim1.GetRes(param1);

And I get this compiler error 

Error   CS1503  Argument 2: cannot convert from 'double[*,*]' to 'System.ValueType[*,*]'
Improve this question
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  • Possible duplicate of passing multidimensional array from C# to C++ DLL Commented May 29, 2019 at 16:53
  • 1
    Delete the ^ from double, it is a value type. Commented May 29, 2019 at 17:00
  • @HansPassant Thanks! It works, please add the answer so I can choose your answer. Commented May 29, 2019 at 17:04
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