How to use SecureStringToBSTR in .net standard? (c

问题:

I would like to convert a SecureString to an IntPtr. Until now, in .net 4.7 I was using this way:

try
{
    IntPtr bstr1 = IntPtr.Zero;
    bstr1 = Marshal.SecureStringToBSTR(ss1);
}
finally
{
    if (bstr2 != IntPtr.Zero) Marshal.ZeroFreeBSTR(bstr2);
    if (bstr1 != IntPtr.Zero) Marshal.ZeroFreeBSTR(bstr1);
}

But I am trying to convert this project to .net standard 1.6, but the method is not available in Marshal type.

So I would like to know how to convert the SecureString to IntPtr in .net standard.

Thanks.