Using a non.NET Dll with a Ref pointer-parameter in C#

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C#3.0

C#

Hi everybody
I have a problem with my C# program and I'd like to get your advice
In the past, I wrote a traditional DLL (TryingDLL) with following code
....

EXPORT void Test(double* &ptrDbl,long n)
{
	ptrDbl=new double[n];
	for(long i=0;i<n;i++)
	{
		ptrDbl[i]=i+100;
	}
}

...
Then I compiled to "TryingDLL.dll". Now I want to use the function Test in that library in my C# program
...

namespace CSApp
{
    class Program
    {
        [DllImport("E:\\Temp\\Programming\\C++\\TryingDll\\App\\Output\\TryingDll.dll")] 
        private static extern unsafe void Test(out double * p,long n);
        
        static unsafe void Main(string[] args)
        {
            double* p;
            Test(out p,3);
            //Console.WriteLine(p[2])        
            Console.ReadLine();
        }
    }

...
But this code didn't work (there's no error when I built it, but the program can not run with an error message).
Can anyone help me to solve the problem?
(I also tried using the library with a test C++ code and it worked very well)
Thanks.