cannot return delphi array in C# array -

i want use delphi array function in c#.

my delphi code:

   tintegerarray = array of integer;    function testarray(): tintegerarray stdcall; export;     var       res: tintegerarray2;     begin       setlength(res, 10);       res[5] := 55;       result := res;     end;     exports testarray; 

c# code:

[dllimport("gitatele.dll", callingconvention = callingconvention.stdcall)] public static extern int[] testarray(); 

show me error: cannot marshal 'return value': invalid managed/unmanaged type combination.

delphi dynamic arrays not valid interop types. need have caller allocate array, , let callee populate it.

procedure populatearray(arr: pinteger; var len: integer); stdcall; var   i: integer;   returnarray: tarray<integer>; begin   returnarray := getarray;   len := min(len, length(returnarray));   := 0 len - 1   begin     arr^ := returnarray[i];     inc(arr);   end; end; 

do note export has no meaning, ignored, , should removed sake of simplicity.

from c# calling code is:

[dllimport("...", callingconvention = callingconvention.stdcall)] public static extern void populatearray(     [in, out]     [marshalas(unmanagedtype.lparray, sizeparamindex = 1)]     int[] arr,     ref int len );  ....  int[] arr = new int[50]; int len = arr.length; populatearray(arr, ref len); // len contains actual length