帮我看看这个错误在哪？？？

ParameterTest.SomeFunction(ints,i);
你的方法包含在另一个类里面了,如果想直接调用的话应该去掉  class ParameterTest 这个类
namespace Wrox.ProCSharp.ParameterTestSample
{
    class Program
    {

        public static int Main()
        {
            int i = 0;
            int[] ints = { 0, 1, 2, 4, 8 };
            Console.WriteLine("i="+i);
            Console.WriteLine("ints[0]="+ints[0]);
            Console.WriteLine("Calling SomeFunction...");

            SomeFunction(ints,i);
            Console.WriteLine("i=" + i);
            Console.WriteLine("ints[0]="+ints[0]);

            return 0;
        }

      
        
            static void SomeFunction(int[] ints, int i)
            {
                ints[0] = 100;
                i = 100;
            }
        

    }
}