Console.WriteLine("姓名：{0}，年龄：{1}", name, age);

------解决方案--------------------
C# code

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication1
{

    class Person
    {
        private String name = "张三";
        private int age = 12;
        public void Display()
        { Console.WriteLine("姓名[color=#800000]：{0}，[/color]年龄[color=#800000]：{1}",[/color]this.name,this.age); }

        public void setName(string personName)

        { name = personName; }

        public void setAge(int personAge)
        { age = personAge; }

        public Person(string Name, int Age)
        { name = Name; age = Age; }
        public Person()
        { name = "田七"; age = 70; }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Person oneperson = new Person("李四", 30);
            oneperson.Display();
            oneperson.setName("王五");
            oneperson.setAge(40);
            oneperson.Display();
            oneperson = new Person();
            oneperson.Display();
            Console.ReadKey();

        }
    }
}

这里的括号问题

------解决方案--------------------
探讨

括号不对不可能通过编译。display方法没传参数，谁知道你的name和age是什么。你要么就写上，this.name
this.age啊。