第一章 章标题－F2 上空24，下空24

Transcription

1 2 C# C# C#.NET ASP.NET C# C# C# 2.1 C# C#.NET.NET C#.NET C# CLR C#.NET C# C# C++ Visual Basic C# C++ C++ C# C#.NET C# C C++ C#. C# C# C# C# C# C# 2-01.cs C# 2-01.cs

2 class Hello{ public static void Main() { Console.WriteLine("! "); C# ; C C++ C# C# Main() Main() Main() void int C#.NET Framework SDK C# csc.exe C Sharp Compiler \WINNT\Microsoft.NET\Framework\v PATH C# 1-01.cs C# csc 2-01.cs 2-01.exe C# using System Name Space C# using using 2-02.cs class Hello { public static void Main() { System.Console.WriteLine("! ");

3 2.1.4 Console System C# Console WriteLine() ReadLine() 2-03.cs ReadLine() 2-03.cs class Hello { public static void Main() { Console.Write( ); string str_bookname=console.readline(); Console.WriteLine("!{0 ",str_bookname); csc 2-03.cs Write() WriteLine() Write() ReadLine() str_bookname WriteLine() { DOS Copy a.txt b.txt Copy a.txt b.txt C# C 2-04.cs 2-04.cs public class Hello{ public static void Main(string[] args) {

4 Console.WriteLine(" {0 ",args.length); Console.WriteLine(" "); for(int i=0; i<args.length; i++) { Console.WriteLine("Arg[{0]=[{1]", i, args[i]); C# 2-3 C# C // /* */ 2-05.cs 2-05.cs class Hello{ static void Main() { /* DateTime t t */ DateTime t=datetime.today; string str_time; // str_time str_time=t.tolongdatestring(); Console.WriteLine(" :{0",str_Time); 2-4

5 C# C# Value Type Reference Type Simple Type Struct Type Enum Type 3 Class Type Array Type Delegate Type C# something Something SOMETHING C# 31.;, _ C++ numberofstudents numofstudent mybook theboy numofstudent imycar stredit π const 2-06.cs 2-06.cs

6 class Hello{ public const double PI= ; static void Main(){ Console.WriteLine( PI {0,PI); 2-06.cs PI Main() C# C# sbyte byte short ushort int uint long ulong

7 cs class Hello{ public static void Main() { short x=32766; x++; Console.WriteLine(x); x++; Console.WriteLine(x); x short x C# true false C 0 C# true false C# float double 1.5* * * * C# decimal * *

8 m decimal decimal cur=100.0m m double Unicode Unicode 16 char mychar='m'; Unicode char mychar='\x0034';//mychar='4' char mychar='\u0039';//mychar='9' C# \ \ \\ \0 \a \b \f \n \r \t tab \v tab struct 2-08.cs 2-08.cs struct Teacher { public string Name; // public uint Age; // public string Phone; // public string Address; // class Test{ public static void Main() { Teacher t; // Teacher t

9 t.name=" "; t.age=35; t.phone=" "; t.address=" "; Console.WriteLine(" ={0, ={1, ={2, ={3", t.name,t.age,t.phone,t.address); C enum 2-09.cs 2-09.cs enum WeekDay { ; Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday class Test { static void Main() { WeekDay day; day=weekday.sunday; // WeekDay day; Console.WriteLine("day {0",day); 2-8

10 2-8 int 0 1 Sunday 2 3, C# C# C# object string object C# object object uint ival=136; object obval; obval=ival; Object obstr='w'; string C#.Length C# cs 2-10.cs class test{ static void Main() { int[] arr1=new int[2];

11 int[] arr2=new int[]{1,2,3; string[] arr3={"six"," is ","me"; int[,] arr4={{1,2,{3,4; int[,] arr5=new int[3,4]; for(int i=0;i<arr1.length;i++) { arr1[i]=i*i*i; Console.WriteLine("arr1[{0]={1",i,arr1[i]); for (int i=0;i<4;i++) { for(int j=0;j<3;j++) { arr5[j,i]=i*j; Console.WriteLine("arr5[{0,{1]={2",j,i,arr5[j,i]); C# C 3x2 int aa[2][1] C# int aa[2,1] 2-11.cs 2-11.cs

12 delegate int mydelegate(); class myclass { public int InstMethod() { class Test { Console.WriteLine("Call the InstMethod."); return 0; static public void Main() { myclass p=new myclass(); mydelegate d=new mydelegate(p.instmethod); d(); // p.instmethod Interface Property 2-12.cs 2-12.cs namespace InterfaceTest{ interface IPoint { int x { get; set;

13 int y { get; set; class MyPoint : IPoint { private int myx; private int myy; public MyPoint(int x, int y) { myx = x; myy = y; public int x { get { return myx; set { myx = value; public int y { get { return myy; set { myy = value; class Class1{ static void Main(string[] args){ MyPoint p = new MyPoint(2,3); Console.Write("My Point: "); PrintPoint(p); private static void PrintPoint(IPoint p) { Console.WriteLine("x={0, y={1", p.x, p.y);

14 * / new --x x++ x + y (c? x: y) * / % 2-13.cs 2-13.cs enum Weekday { ; Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday class test { static void Main() { string mystr1 = " "; string mystr2 = " "; string mystr3 = mystr1 + mystr2; Weekday d1 = Weekday.Sunday; Weekday d2 = d1 + 3;

15 Console.WriteLine("d1={0,d2={1",d1,d2); Console.WriteLine(mystr3); C# = += -= *= /= %= = ^/ <<= >>= C# &&! if switch if if if if( ) else if else if if( 1){ ; else if( 2){ ( );

16 else{ 2-14.cs if 2-14.cs class Hello { public static void Main() { Console.Write(" "); string str_username=console.readline(); if(str_username=="six"){ Console.WriteLine("!{0, ",str_username); else{ Console.WriteLine("{0 ",str_username); if else if else if else if switch switch switch Switch switch( ){ case 1: ; case 2:

17 ; default: ; switch default Switch switch switch switch case switch switch case switch default default switch switch case switch default switch break switch 2-15.cs switch 2-15.cs class Sample{ public static void Main() { int myage=10; string mystr; switch (myage) { case 10: mystr="!"; break; case 25: mystr="!"; break; default: mystr=" "; break; Console.WriteLine(" {0",mystr); switch case break switch switch

18 2.3.5 False True C# 4 do--while True while True for for each do-while do...while True True True 2-16.cs do-while 2-16.cs class test{ public static void Main() { int sum=0; // 0 int i=1; do { sum+=i; i++; while (i<=100); // 1 Console.WriteLine(" {0",sum); while i do-while While while

19 While while do-while While do-while while 2-17.cs while 2-17.cs class Sample{ public static void Main() { int sum=0; int i=1; while (i<=100) { sum+=i; i++; Console.WriteLine(" {0",sum); While While For for for for ( ; ; ){ 2-18.cs for for 2-18.cs class test{ public static void Main() { int sum = 0; for(int i= 1;i <= 100; i++) { sum += i;

20 Console.WriteLine(" {0\n",sum); sum = 0; int j= 1; for(;;) { if(j > 100) break; sum += j; j++; Console.WriteLine(" {0",sum); bre continue break break switch while do for for-each break switch while do for for-each switch while do for for-each break goto 2-19.cs break 2-19.cs class test{ public static void Main() { int sum=0; int i=1; while (true) { sum+=i; i++; if (i>100) break; // i 100, Console.WriteLine(" {0",sum); if break break

21 continue continue 2-20.cs continue 2-20.cs class test{ public static void Main() { for(int n=100;n<=200;n++) { if(n%3==0) continue; Console.WriteLine(" {0",n); continue 2.4 C# throw C# try try Try 3 try-catch try-finally try-catch-finally

22 2.4.1 try-catch try catch try catch catch 2-21.cs try-catch 2-21.cs class Sample{ public static void Main(string[] args) { long factorial=1; long num=int64.parse(args[0]); try { checked { // num for (long cur=1;cur<=num;cur++) factorial*=cur; catch (OverflowException oe) { Console.WriteLine(" {0 ",num); Console.WriteLine("{0",oe.Message); return; Console.WriteLine("{0 {1",num,factorial); checked try-finally 2-17 try-catch try try-finally finally try

23 finally 2-22.cs try-finally 2-22.cs public class Sample { public static void Main() { try { Console.WriteLine(" try!"); goto leave; // leave finally { leave: Console.WriteLine(" finally!"); Console.WriteLine(" leave!"); try-catch-finally 2-18 try-finally try try-catch-finally catch finally 2-23.cs try-catch-finally 2-23.cs class Sample{ public static void Main() { try { throw(new ArgumentNullException()); //

24 catch(argumentnullexception e) { Console.WriteLine("Exception:{0",e.Message); finally { Console.WriteLine(" finally "); try-finally 2.5 C# new class A{ class B{ void f() { A a=new A(); B f A

25 2.5.2 inheritance polymorphism 2-24.cs 2-24.cs class BaseA{ public void FuncA() { System.Console.WriteLine( "Funciton A" ); class DerivedA : BaseA{ public void FuncB() { class Tester{ System.Console.WriteLine( "Function B" ); public static void Main( string[] args ) { DerivedA aderived = new DerivedA(); aderived.funca(); aderived.funcb(); DerivedA BaseA DerivedA BaseA (public) (private) (protected) (internal)

26 2-25.cs 2-25.cs class Class1{ public string s; // protected int i; // private double d; // public void F1() { s="welcome six!"; // i=100; // d=18.68; // public static void Main() { Class1 a=new Class1(); a.s="six"; Console.WriteLine("{0",a.s); class Class2:Class1 { // Class1 Class2 int x; // public void F2() { x=100; // s="hello liu"; // Class1 //d=188.88; // Class1 i=250; // Class1 class Class3{ public void F3() { Class1 c=new Class1(); // Class1 C c.s="sixage"; // Class1 //c.d=108.55; // Class1 //c.i=300; // Class1

27 public new 2-26.cs 2-26.cs class Desk{// ~ public Desk(){ Console.WriteLine("Constructing Desk"); weight=6; high=3; width=7; length=10; Console.WriteLine("{0,{1,{2,{3",weight,high,width,length); ~Desk(){ Console.WriteLine("Destructing Desk "); protected int weight;

28 protected int high; protected int width; protected int length; public static void Main(){ ; Desk aa=new Desk(); Console.WriteLine("back in main() "); Desk() ~Desk() this this this this this this this this 2-27.cs this 2-27.cs public class Employee { public string name; // public decimal salary; // // public Employee(string name, decimal salary) { // this name salary this.name = name; this.salary = salary;

29 // public void DiaplayEmployee() { Console.WriteLine(" :{0",name); Console.WriteLine(" :{0 ",salary); // this Tax.CalcTax() Console.WriteLine(" :{0 ",Tax.CalcTax(this)); public class Tax { public static decimal CalcTax(Employee E) { return (0.14m*(E.salary-800.0m)); public class Sample{ public static void Main() { // Employee e Employee e = new Employee(" ",4123.6m); e.diaplayemployee(); // static 2-23 this static static. static 2-28.cs static 2-28.cs public class Person {

30 private int id; public static int total = 0; public Person() { total++; id = total; public class OtherClass { public static void Main() { Person.total = 100; Console.WriteLine (Person.total); Person c = new Person(); Console.WriteLine (Person.total); static Person id total total static Person Person 1 id total static static static static 2-29.cs 2-29.cs public class Person { private int id; private static int total = 0; public static int gettotalperson() { return total; public Person() {

31 total++; id = total; public class TestPerson { public static void Main() { Console.WriteLine (Person.getTotalPerson()); Person p1 = new Person(); Console.WriteLine (Person.getTotalPerson()); C# C# C# (Polymorphism) C# C# C# virtual virtual static abstract override

32 2-30.cs 2-30.cs class Test{ static void Main(string[] args) { class Base{ Base b = new Base(); b.draw(); Derived d = new Derived(); d.draw(); d.fill(); Base obj obj.fill(); obj.draw(); public void Fill() { = new Derived(); System.Console.WriteLine("Base.Fill"); public virtual void Draw() { System.Console.WriteLine("Base.Draw"); class Derived : Base{ public override void Draw() { System.Console.WriteLine("Derived.Draw"); public new void Fill() { System.Console.WriteLine("Derived.Fill"); new override 2-26

33 2-26 Base obj = new Derived(); obj Base obj.draw() abstract 2-31.cs 2-31.cs abstract public class Window{ public Window(int top, int left) { this.top = top; this.left = left; abstract public void DrawWindow( ); protected int top; protected int left; public class ListBox : Window{ public ListBox( int top, int left, string contents): base(top, left) { // listboxcontents = contents; public override void DrawWindow( ) { Console.WriteLine ("Writing string to the listbox: {0", listboxcontents);

34 private string listboxcontents; public class Tester{ static void Main( ) { Window[] winarray = new Window[3]; winarray[0] = new ListBox(1,2,"First List Box"); winarray[1] = new ListBox(3,4,"Second List Box"); for (int i = 0;i < 2; i++) { winarray[i].drawwindow( ); cs 2-32.cs class Overload{ public void Func() { System.Console.WriteLine( "Func()" ); public void Func( int x, int y ) { System.Console.WriteLine( "Func( int x, int y )" ); public void Func( long x, long y ) { System.Console.WriteLine( "Func( long x, long y )" );

35 public static void Main( string[] args ) { Overload myoverload = new Overload(); myoverload.func(); myoverload.func(1,1); myoverload.func(1l, 1L); // myoverload.func(1l,1); cs class CtorOverloadDemo{ static void Main(String[] args) { MyInt i = new MyInt(2); System.Console.WriteLine(i.i); MyInt j = new MyInt(); System.Console.WriteLine(j.i); class MyInt{ public int i; public MyInt() { i = 0; public MyInt( int i ) { this.i = i;

36 Object Object Object Boxing Unboxing 2-34.cs 2-34.cs public class UnboxingTest { public static void Main( ) { int i = 123; // object o = i; // int j = (int) o; Console.WriteLine("j: {0", j);

37 NET int intage=25; string strage=intage.tostring(); ToString().NET Framework ToString().NET FrameWork System.Object Convert Conver Convert.ToBoolean() Convert.ToChar() Convert.ToDateTime() Convert.ToDecimal() Convert.ToInt32() bool true false char Decimal int int int intage=convert.toint32( 25 ); String bool Boolean MyBool = Convert.ToBoolean("true" string.net string Framework String 2-31

38 2-31 string Length IndexOf Substring Length string mystr1="ababccdd"; Console.WriteLine({0, mystr1.length); // 8 IndexOf string mystr1="ababccdd"; Console.WriteLine({0, mystr1.indexof("a")); // 0 Substring Substring(int); Substring(int, int); String mystring = "abc"; bool test1 = String.Compare(myString.Substring(2, 1), "c") == 0; // bool test2 = String.Compare(myString.Substring(3, 0), String.Empty) == 0; // :10: cs 2-35.cs public class UnboxingTest { public static void Main( ) { string strdate = " :10:55"; string strday = strdate.substring(0,strdate.indexof(" ")); Console.WriteLine(" : {0", strday);

39 C# C# C# C# C# 2-1 C# C# C#