C#基础--构造函数/析构函数/常用函数

1.构造函数与析构函数
   构造函数与析构函数都是系统自动调用的，相当与JAVA中的构造方法与垃圾回收器
2.常用函数
  ToString()//转换成字符串
  此外：Convert.ToBoolean(), Convert.ToChar(),Convert.ToDateTime(),Convert.ToDecimal(),Convert.ToInt32();
  eg: string myString = "ture";
        bool myBool =  Convert.ToBoolean(MyString);//将myBool转换成bool型
 3.字符串处理函数
   Length属性
   string mystr1 = "abABccDD";
   Console.WriteLine("{0}",mystr1.Lenth)//输出为8
   
   IndexOf方法
   string mystr1= "abABccDD";
   Console.WriteLine("{0}",mystr1.IndexOf("a"));//输出为0
   
   SubString()方法
  String myString = "abc";
   bool test1 = String.Compare(myString.SubString(2,1),"c") = =0;//it is ture
   bool test2 = String.Compare(mySring.SubString(3.0), String.Empty) = = 0;//this is ture

示例代码：

 1 using System;
 2 
 3 public class Desk
 4 {
 5     private int weight;
 6     private int high;
 7 
 8     //define construction function
 9     public Desk()
10     {
11         Console.WriteLine("Constructing Desk");
12         weight = 6;
13         high = 3;
14         Console.WriteLine("weight = {0}\nhigh = {1}",weight,high);
15     }
16 
17     //destruction function
18     ~Desk()
19     {
20         Console.WriteLine("Destructing Desk");
21     }
22 
23     public static void Main()
24     {
25         Desk desk1 = new Desk();
26         Console.WriteLine("back in main");
27 
28         //DateTime t = DateTime.Today;
29         DateTime t = DateTime.Now;
30         //following is some time formation, using ToString("formationg") method imply
31         Console.WriteLine("Now,date time is:{0}",t.ToString("D"));
32         Console.WriteLine("Now,date time is:{0}",t.ToString("d"));
33         Console.WriteLine("Now,date time is:{0}",t.ToString("G"));
34         Console.WriteLine("Now,date time is:{0}",t.ToString("g"));
35         Console.WriteLine("Now,date time is:{0}",t.ToString("T"));
36         Console.WriteLine("Now,date time is:{0}",t.ToString("t"));
37     }
38 }