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?
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