C#圣诞树形

具体的代码如下：
        //等边三角形函数
        static void Triangle(int high)
        {
            for (int i = 0; i < high; i++)
            {
                for (int j = 0; j < 2*high; j++)
                {
                    if (j >= (high - i) && j <= (high + i))
                    {
                        Console.Write("*");