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YAHOO筆試題
abstract class BaseClass
{
public virtual void MethodA()
{
Console.WriteLine("BaseClass");
}
public virtual void MethodB()
{
}
}
class Class1: BaseClass
{
public void MethodA()
{
Console.WriteLine("Class1");
}
public override void MethodB()
{
}
}
class Class2: Class1
{
new public void MethodB()
{
}
}
class MainClass
{
public static void Main(string[] args)
{
Class2 o = new Class2();
o.MethodA();
}
}
請問，此程序輸出結(jié)果是:
1. BaseClass
2. BassClass Class1
3. Class1
4. Class1 BassClass
public static void Main(string[] args)
{
int i = 2000;
object o = i;
i = 2001;
int j =(int) o;
Console.WriteLine("i={0},o={1}, j={2}",i,o,j);
}
1. i=2001,o=2000,j=2000
2. i=2001,o=2001,,j=2001
3. i=2000,o=2001,,j=2000
4. i=2001,o=2000,j=2001
您要創(chuàng)建ASP.NET應(yīng)用程序用于運(yùn)行AllWin公司內(nèi)部的Web站點(diǎn)，這個(gè)應(yīng)用程序包含了50個(gè)頁面。您想要配置這個(gè)應(yīng)用程序以便當(dāng)發(fā)生一個(gè)HTTP代碼錯(cuò)誤時(shí)它可以顯示一個(gè)自定義的錯(cuò)誤頁面給用戶。您想要花最小的代價(jià)完成這些目標(biāo)，您應(yīng)該怎么做？(多選)
1. 在這個(gè)應(yīng)用程序的Global.asax文件中創(chuàng)建一個(gè)Application_Error過程去處理ASP.NET代碼錯(cuò)誤。
2. 在這個(gè)應(yīng)用程序的Web.config文件中創(chuàng)建一個(gè)applicationError節(jié)去處理ASP.NET代碼錯(cuò)誤。
3. 在這個(gè)應(yīng)用程序的Global.asax文件中創(chuàng)建一個(gè)CustomErrors事件去處理HTTP錯(cuò)誤。
4. 在這個(gè)應(yīng)用程序的Web.config文件中創(chuàng)建一個(gè)CustomErrors節(jié)去處理HTTP錯(cuò)誤。
如下程序的運(yùn)行結(jié)果是：
public abstract class A
{
public A()
{
Console.WriteLine('A');
}
public virtual void Fun()
{
Console.WriteLine("A.Fun()");
}
}
public class B: A
{
public B()
{
Console.WriteLine('B');
}
public new void Fun()
{
Console.WriteLine("B.Fun()");
}
public static void Main()
{
A a = new B();
a.Fun();
}
}
1. A B A.Fun()
2. A B B.Fun()
3. B A A.Fun()
4. B A B.Fun()
Which of these string definitions will prevent escaping on backslashes in C#?*
1. string s = #”n Test string”;
2. string s = “’n Test string”;
3. string s = @”n Test string”;
4. string s = “n Test string”;
Which of the following operations can you NOT perform on an ADO.NET DataSet?
1. A DataSet can be synchronised with a RecordSet.
2. A DataSet can be synchronised with the database.
3. A DataSet can be converted to XML.
4. You can infer the schema from a DataSet
In Object Oriented Programming, how would you describe encapsulation?
1. The conversion of one type of object to another.
2. The runtime resolution of method calls.
3. The exposition of data.
4. The separation of interface and implementation.
How does assembly versioning in .NET prevent DLL Hell?
1. The runtime checks to see that only one version of an assembly is on the machine at any one time.
2. .NET allows assemblies to specify the name AND the version of any assemblies they need to run.
3. The compiler offers compile time checking for backward compatibility.
4. It doesn’t.
三種常用的字符串判空串方法：
1: bool isEmpty = (str.Length == 0);
2: bool isEmpty = (str == String.Empty);
3: bool isEmpty = (str == "");
哪種方法最快？
1. 1
2. 2
3. 3
public sealed class SampleSingleton1
{
private int m_Counter = 0;
private SampleSingleton1()
{
Console.WriteLine(""初始化SampleSingleton1。"");
}
public static readonly SampleSingleton1 Singleton = new SampleSingleton1();
public void Counter()
{
m_Counter ++;
}
}
以上代碼實(shí)現(xiàn)了設(shè)計(jì)模式中的哪種模式？
1. 原型
2. 抽象工廠
3. 單鍵
4. 生成器
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