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我生日时写下的东西成5。22

2007-05-22 23:46 357 查看
1、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);
}a
A、 i=2001,o=2000,j=2000   B、 i=2001,o=2001,,j=2001
C、 i=2000,o=2001,,j=2000   D、 i=2001,o=2000,j=2001

2、
class Class1
{
public static int Count = 0;
static Class1()
{
Count++;
}
public Class1()
{
Count++;
}
}
Class1 o1 = new Class1();
Class1 o2 = new Class1();
请问,Class1.Count的值是多少?( )
A、 1   B、 2   C、 3   D、4

3、Which of these string definitions will prevent escaping on backslashes in C# ?
A、 string s = #”n Test string”;   B、string s = “’n Test string”;
C、 string s = @”n Test string”;   D、 string s = “n Test string”;

4、Which of the following operations can you NOT perform on an ADO.NET DataSet?
  A、 A DataSet can be synchronised with a RecordSet.
  B、 A DataSet can be synchronised with the database.
  C、 A DataSet can be converted to XML.
  D、 You can infer the schema from a DataSet

5、三种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 == "");
  哪种方法最快?
  A、 1   B、 2  C、3

6、分别用for语句、while语句、do-while语句实现输出1到5的平方值。请填写完整下面的程序。
using System;
  using System.Collections.Generic;
  using System.Text;
  namespace outputSquareValue
  {
  class Program
  {
  static void Main()
  {
  //用for语句实现
  
//用while语句实现
  

//用do-while语句实现
  

Console.ReadLine();
  }
  }
  }

7、DataReader和GridView的异同?

8、在c#中using和new这两个关键字有什么意义,请写出你所知道的意义?

9、简述 private、protected、public、internal修饰符的访问权限。

10、.net的错误处理机制是什么?

11、C#中接口和类的异同?

3、Which of these string definitions will prevent escaping on backslashes in C# ?
A、 string s = #”n Test string”;   B、string s = “’n Test string”;
C、 string s = @”n Test string”;   D、 string s = “n Test string”;

4、Which of the following operations can you NOT perform on an ADO.NET DataSet?
  A、 A DataSet can be synchronised with a RecordSet.
  B、 A DataSet can be synchronised with the database.
  C、 A DataSet can be converted to XML.
  D、 You can infer the schema from a DataSet
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