asp.net常见面试题（一）

1、索引器

class Player
    {
        private int[] arr = new int[100];
        public int this[int index]
        {
            get {
                if (index < 10 || index >= 10)
                {
                    return 0;
                }
                else
                {
                    return arr[index];
                }
            }
            set {
                if (!(index < 0 || index >= 100))
                {
                    arr[index] = value;
                }
            }
        }
    }

class Program
    {
        static void Main(string[] args)
        {
            Player p = new Player();
            p[0] = 100;
            p[1] = 101;
            Console.WriteLine(p[0]);
            Console.ReadKey();
        }
    }

2、应用程序域

把一个程序进程分为各个独立的小进程，各个小进程中相互隔离，互不影响。

demo1

class Player
    {
        private static int i;
        public void SetValue(int a)
        {
            i = a;
        }
        public int GetValue()
        {
            return i;
        }
    }

class Program
    {
        static void Main(string[] args)
        {
            Player p1 = new Player();
            p1.SetValue(5);
            Player p2 = new Player();
            p2.SetValue(10);
            Console.WriteLine(p1.GetValue());
            Console.WriteLine(p2.GetValue());
            Console.ReadKey();
        }
    }

demo2

public class Player:MarshalByRefObject
    {
        private static int i;
        public void SetValue(int a)
        {
            i = a;
        }
        public int GetValue()
        {
            return i;
        }
    }

  private void Form1_Load(object sender, EventArgs e)
        {
            AppDomain appDomain1 = AppDomain.CreateDomain("domain1");
            Player play1 = (Player)appDomain1.CreateInstanceFromAndUnwrap("WindowsFormsApplication1.exe", "WindowsFormsApplication1.Player");
            play1.SetValue(5);
            AppDomain appDomain2 = AppDomain.CreateDomain("domain2");
            Player play2 = (Player)appDomain2.CreateInstanceFromAndUnwrap("WindowsFormsApplication1.exe", "WindowsFormsApplication1.Player");
            play2.SetValue(100);
            MessageBox.Show(play1.GetValue().ToString());
            MessageBox.Show(play2.GetValue().ToString()); 
        }

3、CTS、CLS、CLR区别

cts:Comment Type System 通用系统类型，int32、int16--->int,String----->string,Boolean---->bool 不同语言变量类型不同，最后在.net上转换后都是同一种形式。

cls:Comment Language Specification 通用语言规范，不同语言语法不同，最后在.net上转换后都是同一种形式。

clr:Comment Language Runtime 公共语言运行时