using System;
using System.Collections.Generic;

double[] g = new[] { 9.1, 1.1 };
EnumerableInfo<double>(g);

static void EnumerableInfo<T>(IEnumerable<T> value)
{
    var valueType = value.GetType();
    var ElementTypeCode = Type.GetTypeCode(valueType);
    Console.WriteLine($"   ElementTypeName: {valueType.Name}");
    Console.WriteLine($"   ElementTypeCode: {ElementTypeCode}");
}