c#面试题（1）笔试题

　  url = "b.aspx?name=Carl" ; 
　　Response.Redirect(url); 

string  a = Request.QueryString["name"]; 

Session["Name"] ="Carl"; 

name = Session["Name"].ToString(); 

HttpCookie objCookie = new HttpCookie("Name","Carl!");
Response.Cookies.Add(cookie); 

string myName1Value;
myName1Value = Request.Cookies[ "Name" ].Value;

Application["Name"] = "Carl"; 

string Name; 
Application.Lock();  //使用lock防止并发修改
Name = Application["Name"].ToString(); 
Application.UnLock(); 

public string Name 
{ 
　　get{ return "Carl";} 
} 
private void Button1_Click(object sender, System.EventArgs e) 
{ 
　　Server.Transfer("b.aspx"); 
}

a newWeb; //实例a窗体 
newWeb = (source)Context.Handler; 
string Name; 
Name = newWeb.Name; 

select * from (select ROW_NUMBER() over(order by t.ID) curr,t.* from tableA t) a where a.curr between 31 and 40 
select top 40 * from tableA  except select top 30 * from tableA 
select top 10 * from tableA where ID not in (select top 30 ID from tableA)

int Sum = 0 ;    //判断奇偶，奇就加，偶就减
for (int i = 0 ; i < m+ 1 ; i++)  
{
　　if((i%2) == 1)         
　　{
　　　　Sum += i ;
　　}
   else
　　{
　　　　Sum = Sum - i ;
　　}
}

int result = 0;          //第二种：（1 - 2） + （3 - 4）+...
if (max % 2 == 0)
{
　　result = (max / 2) * (-1); 

} 
else 
{
   result = ((max + 1) / 2) * (-1) + max + 1;
}

int n = 50;
int i = 0;
while(true)
{
    n-=3;
    n++;
    i++;
    if (n<3) 
 　　{
       Console.WriteLine("共喝了"+(50+i)+"瓶");
       break;
     }
 }

Select ID FROM table1 Where LastUpdateDate = (Select MAX(LastUpdateDate) FROM table1)

int i, j;           
    int temp;
 
    for (i = 0; i < len -1; ++i)
    {
        for (j = len - 1; j > i; --j)
        {
            if (array[j] < array[j - 1])
            {
                temp = array[j];
                array[j] = array[j - 1];
                array[j - 1] = temp;
            }
        }
    }

namespace 观察者模式的实现
{
    //银行短信系统抽象接口，是被观察者--该类型相当于抽象主体角色Subject
    public abstract class BankMessageSystem
    {
        protected IList<Depositor> observers;

        //构造函数初始化观察者列表实例
        protected BankMessageSystem()
        {
            observers = new List<Depositor>();
        }

        //增加预约储户
        public abstract void Add(Depositor depositor);

        //删除预约储户
        public abstract void Delete(Depositor depositor);

        //通知储户
        public void Notify()
        {
            foreach (Depositor depositor in observers)
            {
                if (depositor.AccountIsChanged)
                {
                    depositor.Update(depositor.Balance, depositor.OperationDateTime);
                    //账户发生了变化，并且通知了，储户的账户就认为没有变化
                    depositor.AccountIsChanged = false;
                }
            }
        }
    }

    //北京银行短信系统，是被观察者--该类型相当于具体主体角色ConcreteSubject
    public sealed class BeiJingBankMessageSystem : BankMessageSystem
    {
        //增加预约储户
        public override void Add(Depositor depositor)
        {
            //应该先判断该用户是否存在，存在不操作，不存在则增加到储户列表中，这里简化了
            observers.Add(depositor);
        }

        //删除预约储户
        public override void Delete(Depositor depositor)
        {
            //应该先判断该用户是否存在，存在则删除，不存在无操作，这里简化了
            observers.Remove(depositor);
        }
    }

    //储户的抽象接口--相当于抽象观察者角色（Observer）
    public abstract class Depositor
    {
        //状态数据
        private string _name;
        private int _balance;
        private int _total;
        private bool _isChanged;

        //初始化状态数据
        protected Depositor(string name, int total)
        {
            this._name = name;
            this._balance = total;//存款总额等于余额
            this._isChanged = false;//账户未发生变化
        }

        //储户的名称，假设可以唯一区别的
        public string Name
        {
            get { return _name; }
            private set { this._name = value; }
        }

        public int Balance
        {
            get { return this._balance; }
        }

        //取钱
        public void GetMoney(int num)
        {
            if (num <= this._balance && num > 0)
            {
                this._balance = this._balance - num;
                this._isChanged = true;
                OperationDateTime = DateTime.Now;
            }
        }

        //账户操作时间
        public DateTime OperationDateTime { get; set; }

        //账户是否发生变化
        public bool AccountIsChanged
        {
            get { return this._isChanged; }
            set { this._isChanged = value; }
        }

        //更新储户状态
        public abstract void Update(int currentBalance, DateTime dateTime);
    }

    //北京的具体储户--相当于具体观察者角色ConcreteObserver
    public sealed class BeiJingDepositor : Depositor
    {
        public BeiJingDepositor(string name, int total) : base(name, total) { }

        public override void Update(int currentBalance, DateTime dateTime)
        {
            Console.WriteLine(Name + ":账户发生了变化，变化时间是" + dateTime.ToString() + ",当前余额是" + currentBalance.ToString());
        }
    }


    // 客户端（Client）
    class Program
    {
        static void Main(string[] args)
        {
            //我们有了三位储户，都是武林高手，也比较有钱
            Depositor huangFeiHong = new BeiJingDepositor("黄飞鸿", 3000);
            Depositor fangShiYu = new BeiJingDepositor("方世玉", 1300);
            Depositor hongXiGuan = new BeiJingDepositor("洪熙官", 2500);

            BankMessageSystem beijingBank = new BeiJingBankMessageSystem();
            //这三位开始订阅银行短信业务
            beijingBank.Add(huangFeiHong);
            beijingBank.Add(fangShiYu);
            beijingBank.Add(hongXiGuan);

            //黄飞鸿取100块钱
            huangFeiHong.GetMoney(100);
            beijingBank.Notify();

            //黄飞鸿和方世玉都取了钱
            huangFeiHong.GetMoney(200);
            fangShiYu.GetMoney(200);
            beijingBank.Notify();

            //他们三个都取了钱
            huangFeiHong.GetMoney(320);
            fangShiYu.GetMoney(4330);
            hongXiGuan.GetMoney(332);
            beijingBank.Notify();

            Console.Read();
        }
    }
}

-- Create sequence
create sequence SEQ_T_RECV
minvalue 1
maxvalue 9999999
start with 1
increment by 1
cache 50;

-- Create table
create table RECV_MSG
(
 id     NUMBER,
 messageid  VARCHAR2(32),
 contents  VARCHAR2(2000),
 app_flg   VARCHAR2(100),
 phonenumber VARCHAR2(2000),
 updatetime DATE default sysdate
);

 CREATE OR REPLACE TRIGGER "recv_trig"
 BEFORE INSERT ON recv_msg
 REFERENCING OLD AS OLD NEW AS NEW FOR EACH ROW
 DECLARE
 BEGIN
 SELECT SEQ_T_RECV.NEXTVAL INTO :NEW.ID FROM DUAL;
 END recv_trig;

int digui (int n)
{
if(n==1)
    return 1;
else
    return (digui(n-1)+n);
}

　　　　　　  //方法一
            Console.WriteLine("方法一：for循环");
            for (int i = 0; i < array.Length; i++)
            {
                list.Add(array[i]);
                Console.WriteLine(list[i]);
            }
            //方法二
            Console.WriteLine("方法二：使用ArrayList 的CopyTo()方法");
            list.CopyTo(array);
            forList(array, list);
            //方法三
            Console.WriteLine("方法三：使用ArrayList的Adapter()方法");
            ArrayList list1 = ArrayList.Adapter(array);
            forList(array, list1);
            //f方法四
            Console.WriteLine("方法四：直接使用构造方法传入，因为Array实现了ICollection：");
            ArrayList list2 = new ArrayList(array);
            forList(array, list1);
            Console.ReadKey();

　　　　　　　　 List<int> lst = new List<int>();
              Random r = new Random();
              while (true)
              {
                 int temp = r.Next(1, 101);
                 if (lst.Count == 100)
                 {
                     break;
                 }
                 if (!lst.Contains(temp))
                 {
                     lst.Add(temp);
                 }
             }
             for (int i = 0; i < lst.Count; i++)
             {
                 Console.WriteLine(lst[i]);
             }
             Console.Read();

Class A: BaseA ,IneterA
{
  public voerride void F1(){....}
  PUblic  void F2(){....}
}