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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();
請(qǐng)問，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？
A、 1 B、 2 C、3
6、分別用for語(yǔ)句、while語(yǔ)句、do-while語(yǔ)句實(shí)現(xiàn)輸出1到5的平方值。請(qǐng)?zhí)顚懲暾旅娴某绦颉?br>using System;
using System.Collections.Generic;
using System.Text;
namespace outputSquareValue
{
class Program
{
static void Main()
{
//用for語(yǔ)句實(shí)現(xiàn)
//用while語(yǔ)句實(shí)現(xiàn)
//用do-while語(yǔ)句實(shí)現(xiàn)
Console.ReadLine();
}
}
}
7、DataReader和GridView的異同?
8、在c#中using和new這兩個(gè)關(guān)鍵字有什么意義，請(qǐng)寫出你所知道的意義？
9、簡(jiǎn)述 private、protected、public、internal修飾符的訪問權(quán)限。
10、.net的錯(cuò)誤處理機(jī)制是什么？
11、C＃中接口和類的異同?
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