高级程序设计C#第八章.ppt

2019/8/1,1,高级程序设计,授课教师：祁长兴,C#,第八章：常用类,2019/8/1,2,常用类,2019/8/1,3,Math,静态字段 PI E 静态方法 整数运算 初等函数 三角函数,Abs():求绝对值 Ceiling()求大于等于指定数值的最小整数 Floor ()求小于或等于指定数值的最大整数 Round ()对数值进行四舍五入,Exp():求e的指数幂 Pow()指数函数 Log()对数函数 Lg10 ()求以10为底的对数 Sqrt ()求平方根,Sin():求正弦函数 Cos()求余弦函数 Tan()求正切函数 。,2019/8/1,4,static void Main(string args) double a = -1.2; int k = -1,d; double b,c; int i; b = Math.Abs(a); Console.WriteLine(“Abs(a)=0“, b); d = Math.Abs(k); Console.WriteLine(“Abs(k)=0“, d); c = Math.Ceiling(1.2);,Console.WriteLine(“Ceiling(1.2)=0“, c); c = Math.Floor(1.2); Console.WriteLine(“Floor(1.2)=0“, c); c = Math.Round(1.5); Console.WriteLine(“Round(1.5)=0“, c); c = Math.Round(1.2); Console.WriteLine(“Round(1.2)=0“, c); b = Math.Exp(2.1); Console.WriteLine(“Exp(2.1)=0“, b); b = Math.Pow(2, 3); Console.WriteLine(“Pow(2, 3)=0“, b); b = Math.Log(10); Console.WriteLine(“Log(10)=0“, b); b = Math.Log10(10); Console.WriteLine(“Log10(10)=0“, b); b = Math.Sqrt(9); Console.WriteLine(“Sqrt(9)=0“, b); Console.ReadLine(); ,2019/8/1,5,Math,DemoP8-1,2019/8/1,6,string,构造函数与赋值 1。直接赋值：string s1=“software” 2。构造函数赋值： string(char, int) string(char) string(char, int, int),2019/8/1,7,static void Main(string args) string s1 = “helloworld!“; Console.WriteLine(“s1=0“, s1); string s2 = new string(a, 5); Console.WriteLine(“s2=0“, s2); char s3=new charm,i,c,r,o,s,o,f,t; string s4 = new string(s3); string s5 = new string(s3,1,4); Console.WriteLine(“s3=0“, s3); Console.WriteLine(“s4=0“, s4); Console.WriteLine(“s5=0“, s5); Console.ReadLine(); ,2019/8/1,8,String,获取字符 string char: 索引函数 string char: char ToChayArray() char ToChayArray(int int)/起始位置，复制的长度 CopyTo(int,char,int,int)/起始位置，目标数组，指定数组起始位置，复制的长度,2019/8/1,9,static void Main(string args) string s1 = “Microsoft!“; char chs1 = s1.ToCharArray(); char chs2 = s1.ToCharArray(5, 4); Console.WriteLine(new string(chs1); Console.WriteLine(new string(chs2); char chs = new char20; “Microsoft“.CopyTo(0,chs,0,9); “Windows2003“.CopyTo(0, chs, 10, 7); Console.WriteLine(new string(chs); Console.ReadLine(); ,2019/8/1,10,字符查找,int IndexOf(char) int IndexOf(char,int) int IndexOf(char,int,int) int LastIndexOf(char,int,int) int IndexOfAny(char),static void Main(string args) string s1 = “沈阳师范大学软件学院“; int pos = s1.IndexOf(软); Console.WriteLine(“pos=0“, pos); Console.ReadLine(); ,2019/8/1,11,public class SearchCharSample static void Main() bool bFail = true; string sName; char illChars = , #, $, %, ,2019/8/1,12,练习,输入一个字符串，求其中字符e出现的次数,2019/8/1,13,using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 class Program static void Main(string args) / string s1 = “miscrosoft is a big company and it is super enterprise.I study from it and want to enter“; s1 = Console.ReadLine(); int i = 0, j=0,pos =0; while (pos = 0) pos = s1.IndexOf(e, j); if (pos = 0) i+; j = pos + 1; Console.WriteLine(“i=0“,i); Console.ReadLine(); ,2019/8/1,14,字符串填充与修剪,string PadLeft(int) string PadLeft(int char) string Trim() string Trim(char)/TrimStart(), TrimEnd(),2019/8/1,15,static void Main(string args) string s1=“Microsoft“,s2,s3,s4; s2 = s1.PadLeft(12, ); s3 = s2.PadRight(14, ); s4 = s3.PadLeft(16, *); s4 = s4.PadRight(18, *); Console.WriteLine(“0“,s4); Console.ReadLine(); ,2019/8/1,16,String,获取子串 SubString 查找子串 IndexOf / LastIndexOf StartsWith / EndWith 插入/删除子串 Insert / Remove 替换子串 Replace,2019/8/1,17,练习,输入一个字符串，去掉其中子串err,2019/8/1,18,static void Main(string args) / string s1=“Microsoft is are a big company and the leader in it is are super man! “; s1= Console.ReadLine(); int pos=0; while (pos = 0) pos = s1.IndexOf(“are“); if (pos=0) s1 = s1.Substring(0, pos) + s1.Substring(pos + “are“.Length); Console.WriteLine(“0“, s1); Console.ReadLine(); 问题是？ =“Microsoft is are a big company and the leader in it is aarere super man! “;,2019/8/1,19,static void Main(string args) string s1=“Microsoft is are a big company and the leader in it is aarere super man! “,s2; s2 = “; int pos=0; while (pos = 0) pos = s1.IndexOf(“are“); if (pos = 0) s2 =s2+ s1.Substring(0, pos); s1 = s1.Substring(pos + “are“.Length); s2 += s1; Console.WriteLine(“0“, s2); Console.ReadLine(); ,2019/8/1,20,static void Main(string args) string s1=“Microsoft is are a big company and the leader in it is aarere super man! “,s2; s2 = s1.Replace(“are“,“); Console.WriteLine(“0“, s2); Console.ReadLine(); ,2019/8/1,21,Remove() Insert(),2019/8/1,22,String,格式化字符串 Format 解析字符串 Parse / TryParse Demo,2019/8/1,23,StringBuilder,构造函数 性能优化 Demo,2019/8/1,24,常用数据结构类,DateTime: 日期/时间 你会如何设计这个类？ ArrayList: 链表 你会如何设计这个类？ Demo,2019/8/1,25,String,编写程序，输入一个字符串，求串中包含字符串“am”的个数。,2019/8/1,26,static void Main(string args) string s1 = “iamamiddleschoolstudentndiamaboy!iamateacher“; int j=0,k=0,i=0; while( i=0) i = s1.IndexOf(“am“, k); Console.WriteLine(“i = 0“, i); if( i=0) j+; k=i+“am“.Length; Console.WriteLine(“s1 = 0“, j); Console.ReadLine(); ,2019/8/1,27,String,判断输入的字符串是否为有效身份证号码（18位，第7位开始，连续8个数字为日期即可）,2019/8/1,28,class Program static void Main(string args) string s1 = Console.ReadLine(); if (s1.Length != 18) Console.WriteLine(“无T效的?身?份证号?码?“); else string s2 = s1.Substring(6, 8); s2 = s1.Substring(6, 4) + “-“ + s1.Substring(10, 2) + “-“ + s1.Substring(12, 2); try DateTime d1 = DateTime.Parse(s2); Console.WriteLine(“有瓺效的?身?份证号?码?“); catch (Exception) Console.WriteLine(“无T效的?身?份证号?码?“); finally Console.ReadLine(); ,2019/8/1,29,常用类,Windows窗体和控件,2019/8/1,30,Windows窗体和控件,Color Size / Point SizeF / PointF Demo,2019/8/1,31,Windows窗体和控件,Form 构造函数 属性 方法 事件 Demo,2019/8/1,32,Windows窗体和控件,Control 属性 方法 事件,2019/8/1,33,Windows窗体和控件,2019/8/1,34,Windows窗体和控件,模态 ShowDialog 非模态 Show 常用事件 Load FormClosing FormClosed。,2019/8/1,35,Windows窗体和控件,private void Form1_FormClosing(object sender, FormClosingEventArgs e) MessageBox.Show(“Form1_FormClosing“); private void Form1_FormClosed(object sender, FormClosedEventArgs e) Message