Extension method for copy array of structs from pointer (unmanaged memory) to generic collection

PtrExtensions.cs

internal static class PtrExtensions
{
    public static IEnumerable<T> GetArrayOfStruct<T>(this IntPtr ptrToStructArr, int arrSize)
    {
        var output = new List<T>(arrSize);
        var sizeInBytes = Marshal.SizeOf(typeof(T));
        for (var i = 0; i < arrSize; i++)
        {
#if x64
            var ptrToStruct = new IntPtr(ptrToStructArr.ToInt64() + i*sizeInBytes);
#else
            var ptrToStruct = new IntPtr(ptrToStructArr.ToInt32() + i*sizeInBytes);
#endif
            output.Add(Marshal.PtrToStructure<T>(ptrToStruct));
        }
        return output;
    }
}