asp.net常见面试题（一）

1、索引器

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

 class Program
     {
         static void Main(string[] args)
         {
             Player p = new Player();
             p[] = ;
             p[] = ;
             Console.WriteLine(p[]);
             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();
             Player p2 = new Player();
             p2.SetValue();
             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();
             AppDomain appDomain2 = AppDomain.CreateDomain("domain2");
             Player play2 = (Player)appDomain2.CreateInstanceFromAndUnwrap("WindowsFormsApplication1.exe", "WindowsFormsApplication1.Player");
             play2.SetValue();
             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