赴微软C# SDE(T) 开发 面试题.doc

GEMS LAB CORPORATION RECRUITMENT Position: C# .NET Software design engineer(Testing)Quiz Time: 60 minutesCandidates Name:Score:SECTION 1 (3x7) The score of section 1 is _ 1 Whats the different between STRUCT and CLASS in C#?Struct是值类型。Class是引用类型。Struct类型的值直接存放在线程堆栈中，而Class类型的值存放在托管堆中，因此Struct类型的存取速度比Class快，而Class才能被垃圾收集器收集，Struct则不能。Struct is Reference Types,and Class is Value Types。Value Types are always allocated from the stack; Reference types are always allocated from the managed heap.Reference types are under the control of the garbage collector and Value Types are not.2. List all BOXING operations occur in the following code?public static void Main() Int32 v = 5; Object o = v; BOXINGv = 123; Console.WriteLine(v + , + (Int32) o); BOXINGObject o = v;Console.WriteLine(v + , + (Int32) o);3. Read the following code, please judge（1）Can the Edit pass? If not, how to revise?Yes .（2）Can the code execute after editing? If can, write out the result; else, please point out what is the matter and how to revise.The code can not execute.a System.IO.IOException will occure。Beacause file1 is be used. File.Move(file1, file2) can not execute。Revise:FileStream s= File.Create(file1);s.Close();File.Move(file1, file2);using System;using System.Collections.Generic;using System.Text;using System.IO;namespace ConsoleApplication1 class Program static void Main(string args) string path1 = C:temp; string path2 = C:test; string file1 = path1 + + test.txt; string file2 = path2 + + temp.txt; Directory.CreateDirectory(path1); Directory.CreateDirectory(path2); File.Create(file1); File.Move(file1, file2); File.Delete(file1); File.Delete(file2); 4. In Jacks family, there are four people, he, his wife, his son and his mother. One of the family is an Engineer, and another is a Doctor.If the Doctor is a male, then the Engineer is a male. If the Engineer is younger than the Doctor, then the Engineer and the Doctor are not blood relatives.If the Engineer is a female, then she and the Doctor are blood relatives.Can you tell who is an Engineer? ( A )A) Jack B) Jacks wifeC) Jacks sonD) Jacks mother5. The fathers age is three years more than three times the sons age.After three years, fathers age will be ten years more than twice the sons age.What is the fathers present age? ( C )A) 30B) 32C) 33D) 366. At 6o, a clock ticks 6 times.The time between first and last ticks is 30 seconds.How long does it tick at 12o clock. ( C )A) 60B) 66C) 65D) 30SECONTION 2 Basic Technical Knowledge (6x4)The score of section 2 is _ 1. Describe TCP/IP network model, then list commonly used protocols in each layer and describe the purpose of these protocols?1、主机到网络层2、网络互连层. 它的功能是把分组发往目标网络或主机。3、传输层. 传输层的功能是使源端主机和目标端主机上的对等实体可以进行会话。在传输层定义了两种服务质量不同的协议。TCP,UDP。4、应用层.针对网络中两台机器的应用程序互相操作的协议。比如http, TELNET.2. Given IP address 7 with subnet mark , whats the possible address of the default gateway for this host? Then whats purpose of the default gateway?3. Describe purpose of DHCP, DNS and WINS. How to configure them on Windows Server 2003?DHCP是Dynamic Host Configuration Protocol的缩写，它是TCPIP协议簇中的一种，主要是用来给网络客户机分配动态的IP地址。这些被分配的IP地址都是DHCP服务器预先保留的一个由多个地址组成的地址集，并且它们一般是一段连续的地址。DNS是域名服务系统。把域名转换成为网络可以识别的ip地址.WINS是Windows Internet Name Server（Windows网际名字服务）的简称。WINS为NetBIOS名字提供名字注册、更新、释放和转换服务4. In SQL query script, whats the difference between INNER JOIN and OUTER JOIN? Please write 2 SQL script samples to show the difference.Table aNameagexiaowang16xiaoming19Table bNameBloodxiaowangAxiaoliBInner joinSelect b.*, a.age,FromAInner joinBOna. name=resultNameageBloodxiaowang16AOuter joinSelect b.*, a.age,FromALeft outer joinBOnb. name=NameageBloodxiaowang16AxiaoliA内连接是根据每个表共有的列的值匹配两个表中的行。左外连接是根据左表的列与右表匹配。左表的所有列都会显示。右表的列只显示匹配成功的行，否则该列为空。SECTION 3 Test Foundations (6x3) The score of section 3 is _ 1. You are in charge of InternetExplorers research and development. What will you do to design, develop and test it?使用开源得方式。2. What will you do to test a banks ATM? Please give a test plan, and then list all test cases by category.ATM操作步骤:1.插卡2输入密码3输入金额4取钱5取卡输入期望值插入无效卡卡被退出,提示卡无效插入正确卡,再插入一张卡卡口封闭,无法插入插入正确卡,输入错误密码提示密码错误,重新输入插入正确卡,输入错误密码连续3次提示密码错误,并自动退出卡.插入正确卡,输入正确密码,输入错误金额提示输入金额错误插入正确卡,输入正确密码,输入正确金额ATM出钱,提示下一次操作3. Given a DVD player. What will you do to test it in a very short time? Also give your reason.SECTION 4 C# and .Net Framework (10x4)1. Write a C# program to show the usage of delegate. Please indicate which functions in C# are based on delegate technology.public delegate int GetValueDelagete(int x,int y);/定义代理类型 class client GetValueDelagete GetValue; public int add(int x,int y) return x + y; public void userdelegate() GetValue = add;/代理获取函数地址 Console.WriteLine(GetValue(1, 2);/使用代理执行方法 2. Assume some one give you a DLL which written with C+, in the DLL there is a method as below Int Sum(int num1, int num2, ) Now you are asked to use this method in your C# program. How do you do? Write up your C# code.如果该DLL是.NET的程序集，则直接引用。使用该方法跟其他的没有任何区别。Public client()Int a=Sum(1,2,.);如果是COM则需要使用如下代码声明该方法DllImport(*.dll)private extern Int Sum(int num1, int num2, )；然后就可以跟调用其他方法一样使用。Public client()Int a=Sum(1,2,.);3. In C#, how do you access SQL Server Database? Write your C# code to show the common data operations. Add, Delete, Update.使用ADO.NETstring s_ConnectionString = Server=localhost;UID=sa;PWD=;Database=databasename;SqlConnection _SqlConnection = new SqlConnection(s_ConnectionString); SqlCommand _SqlCommand = _SqlConnection.CreateCommand(); _SqlCommand.CommandText = Select * from a; _SqlCommand.CommandType = CommandType.Text; _SqlConnection.Open(); _SqlCommand.EndExecuteNonQuery();操作add,de