C Sharp基础

1. C#基础

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace ConsoleApplication1 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            /* 
            Console.WriteLine("hello !"); 
            string s=Console.ReadLine();//用户输入文字时，程序是暂停的，回车后把输入的作为返值，并存放到s当中 
            Console.WriteLine(s+"你好");//输出用户输入的 
 
            int i1 = 10; 
            int i2 = 20; 
            //Console.WriteLine(i1+"+"+i2+"="+(i1+i2));//方法一 
            Console.WriteLine("{0}+{1}={2}",i1,i2,i1+i2,"aaa");//方法二 
            //使用占位符，{0}{1}{2}分别表示三个占位符,顺序从0开始 
 
            Console.WriteLine("请输入男孩的名字"); 
            string boy = Console.ReadLine(); 
            Console.WriteLine("请输入女孩的名字"); 
            string girl = Console.ReadLine(); 
            Console.WriteLine("{0}爱{1}",boy,girl); 
            */ 
            /* 
            string s1 = "\"ab\""; 
            Console.WriteLine(s1); 
            string s2 = "a\nb"; 
            Console.WriteLine(s2); 
            string s3 = @"c:\temp\user\new\1.jpg";//@表示字符串中的\不当成转义符,@只针对转义符 
            Console.WriteLine(s3); 
            */ 
 
            Console.WriteLine("请输入第一个数字"); 
            string s4 = Console.ReadLine(); 
            int i1 = Convert.ToInt32(s4); 
 
            Console.WriteLine("请输入第二个数字"); 
            //string s5 = Console.ReadLine(); 
            //int i2 = Convert.ToInt32(s5); 
            int i2 = Convert.ToInt32(Console.ReadLine()); 
 
            Console.WriteLine("{0}+{1}={2}",i1,i2,i1+i2); 
             
            //中文做变量名 
            string 姓名 = Console.ReadLine(); 
            Console.WriteLine(姓名+" 你好"); 
 
            人 人1 = new 人(); 
            人1.年龄 = 20; 
            人1.说话(); 
 
            Console.ReadKey();//按下一个按键继续执行 
        } 
    } 
} 
 ///////////////////////////////////////////////////////////////

//人.cs

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace ConsoleApplication1 
{ 
    class 人 
    { 
        public int 年龄 { get; set; } 
        public void 说话() 
        { 
            Console.WriteLine(年龄+" 说话"); 
        } 
    } 
} 
 

2. 字符串

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace Cast入门 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            //类型转换 
            Console.WriteLine("int最大值{0}，最小值{1}",int.MaxValue,int.MinValue); 
            Console.WriteLine("byte最大值{0}，最小值{1}",byte.MaxValue,byte.MinValue); 
            byte b = 3; 
            int i1 = b; 
            //b = i1; 
            b = (byte)i1; 
 
            string s = "123"; 
            int i2 = Convert.ToInt32(s); 
            Console.WriteLine(i2); 
 
            Console.ReadKey(); 
        } 
    } 
} 
 ////////////////////////////////////////////////

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace 字符串 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            /* 
            char c1='a'; 
            char c2='b'; 
            string s1 = "hi"; 
            string s2 = "a"; 
            string s3 = ""; 
 
            string s4 = "hello"; 
            Console.WriteLine(s4.Length);//5, 不是6,和C语言不同不考虑'\0' 
            Console.WriteLine(s4[1]); 
            char c3=s4[3]; 
 
            for (int i = 0; i < s4.Length; i++) 
            { 
                char c6=s4[i]; 
                Console.WriteLine(c6); 
            } 
 
            for (int i = s4.Length - 1; i >= 0; i--) 
            { 
                Console.WriteLine(s4[i]); 
            } 
            //s4[0]='y';//不能赋值 
            */ 
 
            /* 
            string s1 = "hello"; 
            char[] chars = s1.ToCharArray();//将字符串转换成字符数组  
            chars[0]='a'; 
            string s2 = new string(chars); 
            Console.WriteLine(s1); 
            Console.WriteLine(s2); 
            */ 
 
            string s1 = "hello"; 
            string s10=s1; 
            char[] chars = s1.ToCharArray(); 
            chars[0]='a'; 
            s1 = new string(chars); 
            Console.WriteLine(s1); 
            Console.WriteLine(s10); 
 
            Console.ReadKey(); 
        } 
    } 
} 
 

3. 枚举学习

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace 枚举学习 
{ 
    enum Gender { Male,Female,Unknown};//声明枚举 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            Gender g = Gender.Female;//枚举的意义在于限定变量的取值范围 
            //Gender g1 = Gender.Male; 
            /* 
            string s = "Male"; 
            if (s == "Male") 
            { 
                Console.WriteLine("女"); 
            } 
            else if (s == "Unknown") 
            { 
                Console.WriteLine("未知"); 
            } 
            esle 
            { 
                Console.WriteLine("非法输入！"); 
            } 
            */ 
        } 
    } 
} 
 

4. 条件判断

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace 条件判断 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            /* 
            string s1 = Console.ReadLine(); 
            int age = Convert.ToInt32(s1); 
            if (age > 20) 
            { 
                Console.WriteLine("成年人"); 
            } 
            //else 
            //{ 
            //    Console.WriteLine("小屁孩"); 
            //} 
             
            else if (age > 10) 
            { 
                Console.WriteLine("儿童"); 
            } 
            else 
            { 
                Console.WriteLine("婴幼儿"); 
            } 
            */ 
 
            /* 
            Console.WriteLine("请输入密码"); 
            string s1 = Console.ReadLine(); 
            if (s1 == "888888") 
            { 
                Console.WriteLine("密码正确"); 
            } 
            else 
            { 
                Console.WriteLine("密码错误，请再输入一次"); 
                s1 = Console.ReadLine(); 
                if (s1 == "888888") 
                { 
                    Console.WriteLine("密码正确"); 
                } 
                else 
                { 
                    Console.WriteLine("密码错误"); 
                } 
            } 
             */ 
 
            /* 
            Console.WriteLine("请输入用户名："); 
            string username = Console.ReadLine(); 
            Console.WriteLine("请输入密码："); 
            string password = Console.ReadLine(); 
            if (username == "admin" && password == "888888") 
            { 
                Console.WriteLine("正确"); 
            } 
            else 
            { 
                Console.WriteLine("用户名、密码错误"); 
                if (username != "admin") 
                { 
                    Console.WriteLine("用户名不存在"); 
                } 
            } 
            */ 
 
            Console.WriteLine("请输入年龄"); 
            string strAge = Console.ReadLine(); 
            int age = Convert.ToInt32(strAge); 
            if (age > 18) 
            { 
                Console.WriteLine("可以查看！"); 
            } 
            else if (age < 10) 
            { 
                Console.WriteLine("不允许查看！"); 
            } 
            else 
            { 
                Console.WriteLine("是否继续查看(yes、no)?"); 
                string isContinue=Console.ReadLine(); 
                if (isContinue == "yes") 
                { 
                    Console.WriteLine("看吧！"); 
                } 
                else if (isContinue == "no") 
                { 
                    Console.WriteLine("乖！"); 
                } 
                else 
                { 
                    Console.WriteLine("输入错误"); 
                } 
            } 
            Console.ReadKey(); 
        } 
    } 
} 
 

5. 数组

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace 条件判断 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            /* 
            string s1 = Console.ReadLine(); 
            int age = Convert.ToInt32(s1); 
            if (age > 20) 
            { 
                Console.WriteLine("成年人"); 
            } 
            //else 
            //{ 
            //    Console.WriteLine("小屁孩"); 
            //} 
             
            else if (age > 10) 
            { 
                Console.WriteLine("儿童"); 
            } 
            else 
            { 
                Console.WriteLine("婴幼儿"); 
            } 
            */ 
 
            /* 
            Console.WriteLine("请输入密码"); 
            string s1 = Console.ReadLine(); 
            if (s1 == "888888") 
            { 
                Console.WriteLine("密码正确"); 
            } 
            else 
            { 
                Console.WriteLine("密码错误，请再输入一次"); 
                s1 = Console.ReadLine(); 
                if (s1 == "888888") 
                { 
                    Console.WriteLine("密码正确"); 
                } 
                else 
                { 
                    Console.WriteLine("密码错误"); 
                } 
            } 
             */ 
 
            /* 
            Console.WriteLine("请输入用户名："); 
            string username = Console.ReadLine(); 
            Console.WriteLine("请输入密码："); 
            string password = Console.ReadLine(); 
            if (username == "admin" && password == "888888") 
            { 
                Console.WriteLine("正确"); 
            } 
            else 
            { 
                Console.WriteLine("用户名、密码错误"); 
                if (username != "admin") 
                { 
                    Console.WriteLine("用户名不存在"); 
                } 
            } 
            */ 
 
            Console.WriteLine("请输入年龄"); 
            string strAge = Console.ReadLine(); 
            int age = Convert.ToInt32(strAge); 
            if (age > 18) 
            { 
                Console.WriteLine("可以查看！"); 
            } 
            else if (age < 10) 
            { 
                Console.WriteLine("不允许查看！"); 
            } 
            else 
            { 
                Console.WriteLine("是否继续查看(yes、no)?"); 
                string isContinue=Console.ReadLine(); 
                if (isContinue == "yes") 
                { 
                    Console.WriteLine("看吧！"); 
                } 
                else if (isContinue == "no") 
                { 
                    Console.WriteLine("乖！"); 
                } 
                else 
                { 
                    Console.WriteLine("输入错误"); 
                } 
            } 
            Console.ReadKey(); 
        } 
    } 
} 
 

6. 变量命名

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace 变量命名 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            /* 
            int i1; 
            int i2,i3; 
            int i4 = 8; 
            i4++; 
            Console.WriteLine(i4); 
            */ 
            /* 
            int i=10; 
            i = 1 + i; 
            i += 2; 
            Console.WriteLine(i); 
 
            int x = 10; 
            int y ; 
            y = x + 80; 
            Console.WriteLine(y); 
            */ 
            /* 
            //交换两变量的值 
            int i1 = 10; 
            int i2 = 20; 
            Console.WriteLine("i1={0},i2={1}",i1,i2); 
 
            int i3; 
            i3 = i1; 
            i1 = i2; 
            i2 = i3; 
            Console.WriteLine("i1={0},i2={1}",i1,i2); 
            */ 
             
            //布尔运算 
            int i = 30; 
            bool b=(i==1); 
            Console.WriteLine("{0}\nb:{1}",i==1,b); 
            Console.WriteLine("i:{0}",i=1); 
            Console.WriteLine("{0}",i!=30); 
 
            int i1 = 20; 
            int i2 = 30; 
            Console.WriteLine("{0}",i1>10&&i2<100); 
            Console.WriteLine("{0}",i1>100&&i2<100); 
            Console.WriteLine("{0}",i1>200||i2<100); 
            
            Console.ReadKey(); 
        } 
    } 
} 
 

7. 函数

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace 函数 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            int i = ReadInt(); 
            i++; 
            Console.WriteLine(i); 
            Console.WriteLine(Max(30,50)); 
 
            string[] names = { "tom","jerry","lucy"}; 
            string s = Join(names,"|"); 
            Console.WriteLine(s); 
 
            Console.ReadKey(); 
        } 
        /* 
        static int ReadInt() 
        { 
            string s = Console.ReadLine(); 
            int i = Convert.ToInt32(s); 
            return; 
        } 
        */ 
        static int CT(string s) 
        { 
            if (s == "tom") 
            { 
                return 1; 
            } 
            if (s == "jerry") 
            { 
                return 0; 
            } 
            return -1; 
        } 
 
        static void SayHello() 
        { 
            int i = 3; 
            if (i > 10) 
            { 
                return; 
            } 
            Console.WriteLine("哈喽哇！"); 
        } 
 
        static int ReadInt() 
        { 
            string s = Console.ReadLine(); 
            return Convert.ToInt32(s); 
        } 
 
        static int Max(int i1, int i2) 
        { 
            if (i1 > i2) 
            { 
                return i1; 
            } 
            return i2; 
        } 
 
        static int Sum(int[] values) 
        { 
            int sum = 0; 
            foreach (int i in values) 
            { 
                sum = sum + i; 
            } 
            return sum; 
        } 
 
        static string Join(string[] strs, string seperator) 
        { 
            string result = ""; 
            for (int i = 0; i < strs.Length - 1; i++) 
            { 
                result = result + strs[i] + seperator; 
            } 
            if (strs.Length > 0) 
            { 
                result = result + strs[strs.Length - 1]; 
            } 
            return result; 
        } 
    } 
} 
 ///////////////////////////////////////////////

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace 函数2 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            Console.WriteLine("{0}{1}{2}{3}{4}",333,55,66,77,88,99,10,"aaa"); 
            string[] values = { "aaa","bbb","ccc"}; 
            VFunc("aaa","111","222","33233","fasfsa","aaa"); 
            SayHello("tom","张大虎","狗蛋"); 
            Console.ReadKey(); 
        } 
 
        static void VFunc(params string[] values)//加params说明这个函数参数个数可变 
        { 
            foreach (string s in values) 
            { 
                Console.WriteLine(s); 
            } 
        } 
 
        static void SayHello(string name, params string[] nicknames) 
        { 
            Console.WriteLine("我的名字是{0}",name); 
            foreach(string nickname in nicknames) 
            { 
                Console.WriteLine("我的昵称：{0}",nickname); 
            } 
        } 
    } 
} 
 

8. 函数重载

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace 函数重载 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            SayHello("王大壮"); 
            SayHello("tom"); 
            SayHello(20); 
            //string s = SayHello("jerry"); 
            SayHello("tom","littletom"); 
            Console.ReadKey(); 
        } 
 
        static void SayHello(string name) 
        { 
            Console.WriteLine("大家好,我是:{0}",name); 
        } 
        /* 
        static void SayHello(string name) 
        { 
            Console.WriteLine("Hello,I am {0}",name); 
        } 
        */ 
 
        static void SayHello(int age) 
        { 
            Console.WriteLine("我{0}岁了",age); 
        } 
 
        /* 
        static string SayHello(string name) 
        { 
            return "大家好,我是"+name; 
        } 
         */ 
        static void SayHello(string name, string nickname) 
        { 
            Console.WriteLine("我的名字是{0},我的昵称是{1}",name,nickname); 
        } 
    } 
} 
 

9. For例子

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace For例子 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            int i = 0; 
            for (i = 10; i < 20; i++) 
            { 
                Console.WriteLine(i); 
            } 
            //Console.ReadKey(); 
 
            for ( i = 10; i > 0; i--) 
            { 
                Console.WriteLine(i); 
            } 
            Console.ReadKey(); 
        } 
    } 
} 
 

10. While语句

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace While语句 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            //while (true) 
            //{ 
            //    Console.WriteLine("我在运行！"); 
            //} 
 
            //int i = 0; 
            //while (i < 10) 
            //{ 
            //    i++; 
            //    Console.WriteLine(i); 
            //} 
 
            //int i = 1; 
            //int sum = 0; 
            //while (i <= 100) 
            //{ 
            //    sum = sum + i; 
            //    i++; 
            //} 
            //Console.WriteLine("{0}",sum); 
 
            //Console.WriteLine("请输入用户名："); 
            //string username = Console.ReadLine(); 
            //Console.WriteLine("请输入密码："); 
            //string password = Console.ReadLine(); 
 
            //while (username != "admin" || password != "888888") 
            //{ 
            //    Console.WriteLine("用户名、密码错误！"); 
            //    Console.WriteLine("请重新输入用户名"); 
            //    username = Console.ReadLine(); 
            //    Console.WriteLine("请输入密码"); 
            //    password = Console.ReadLine(); 
            //} 
 
            //Console.WriteLine("请输入一个数字"); 
            //string s = Console.ReadLine(); 
 
            //while (s != "q") 
            //{ 
            //    int number = Convert.ToInt32(s); 
            //    Console.WriteLine("{0}",number*2); 
            //} 
 
            //while (true) 
            //{ 
            //    Console.WriteLine("请输入一个数字"); 
            //    string s = Console.ReadLine(); 
            //    if (s == "q") 
            //        return; 
            //    int number = Convert.ToInt32(s); 
            //    Console.WriteLine("{0}",number*2); 
            //} 
 
            //int max = 0; 
            //while (true) 
            //{ 
            //    Console.WriteLine("请输入一个数字(结束请输入end):"); 
            //    string s = Console.ReadLine(); 
            //    if (s == "end") 
            //    { 
            //        Console.ReadLine(); 
            //        return; 
            //    } 
            //    int number = Convert.ToInt32(s); 
            //    if (number > max) 
            //    { 
            //        max = number; 
            //    } 
            //} 
 
            //int i = 0; 
            //while (i < 12) 
            //{ 
            //    Console.WriteLine("i={0}",i); 
            //    i++; 
            //    if (i == 10) 
            //    { 
            //        return; 
            //    } 
            //    Console.WriteLine("自增以后i={0}",i); 
            //} 
            //Console.WriteLine("before ReadKey"); 
 
            int sum = 0; 
            int i = 1; 
            while (i <= 100) 
            { 
                if ((i % 7) == 0) 
                { 
                    i++; 
                    Console.WriteLine(i-1); 
                    continue; 
                } 
                sum = sum + i; 
                i++; 
            } 
            Console.WriteLine("{0}",sum); 
 
 
            Console.ReadKey(); 
        } 
    } 
} 
 

11. Switch语句

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace While语句 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            //while (true) 
            //{ 
            //    Console.WriteLine("我在运行！"); 
            //} 
 
            //int i = 0; 
            //while (i < 10) 
            //{ 
            //    i++; 
            //    Console.WriteLine(i); 
            //} 
 
            //int i = 1; 
            //int sum = 0; 
            //while (i <= 100) 
            //{ 
            //    sum = sum + i; 
            //    i++; 
            //} 
            //Console.WriteLine("{0}",sum); 
 
            //Console.WriteLine("请输入用户名："); 
            //string username = Console.ReadLine(); 
            //Console.WriteLine("请输入密码："); 
            //string password = Console.ReadLine(); 
 
            //while (username != "admin" || password != "888888") 
            //{ 
            //    Console.WriteLine("用户名、密码错误！"); 
            //    Console.WriteLine("请重新输入用户名"); 
            //    username = Console.ReadLine(); 
            //    Console.WriteLine("请输入密码"); 
            //    password = Console.ReadLine(); 
            //} 
 
            //Console.WriteLine("请输入一个数字"); 
            //string s = Console.ReadLine(); 
 
            //while (s != "q") 
            //{ 
            //    int number = Convert.ToInt32(s); 
            //    Console.WriteLine("{0}",number*2); 
            //} 
 
            //while (true) 
            //{ 
            //    Console.WriteLine("请输入一个数字"); 
            //    string s = Console.ReadLine(); 
            //    if (s == "q") 
            //        return; 
            //    int number = Convert.ToInt32(s); 
            //    Console.WriteLine("{0}",number*2); 
            //} 
 
            //int max = 0; 
            //while (true) 
            //{ 
            //    Console.WriteLine("请输入一个数字(结束请输入end):"); 
            //    string s = Console.ReadLine(); 
            //    if (s == "end") 
            //    { 
            //        Console.ReadLine(); 
            //        return; 
            //    } 
            //    int number = Convert.ToInt32(s); 
            //    if (number > max) 
            //    { 
            //        max = number; 
            //    } 
            //} 
 
            //int i = 0; 
            //while (i < 12) 
            //{ 
            //    Console.WriteLine("i={0}",i); 
            //    i++; 
            //    if (i == 10) 
            //    { 
            //        return; 
            //    } 
            //    Console.WriteLine("自增以后i={0}",i); 
            //} 
            //Console.WriteLine("before ReadKey"); 
 
            int sum = 0; 
            int i = 1; 
            while (i <= 100) 
            { 
                if ((i % 7) == 0) 
                { 
                    i++; 
                    Console.WriteLine(i-1); 
                    continue; 
                } 
                sum = sum + i; 
                i++; 
            } 
            Console.WriteLine("{0}",sum); 
 
 
            Console.ReadKey(); 
        } 
    } 
} 
 

12. refout参数

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace refout参数 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            int age = 20,age1=20; 
            IncAge(age); 
            IncAge2(out age); 
            IncAge(ref age1); 
 
            Console.WriteLine("无ref:\t"+age); 
            Console.WriteLine("加了ref:\t"+age1); 
 
            int i1 = 10; 
            int i2 = 20; 
            Console.WriteLine("交换前:\ni1:{0},i2{1}",i1,i2); 
            Swap(ref i1,ref i2); 
            Console.WriteLine("交换后:\ni1={0},i2={1}",i1,i2); 
 
            Console.ReadKey(); 
        } 
         
        static void IncAge(int age)//IncAge内部改变的是副本 
        { 
            age++; 
        } 
         
 
        static void IncAge(ref int age) 
        { 
            age++; 
        } 
 
        static void IncAge2(out int age) 
        { 
            age=30; 
            Console.WriteLine("加了out的调用："+age); 
        } 
 
        static void Swap(ref int i1,ref int i2) 
        { 
            int temp=i1; 
            i1=i2; 
            i2=temp; 
        } 
    } 
} 
 

13. 字符串练习1

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace 字符串练习1 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            /* 
            //接收用户输入的字符串，将其反序输出 
            string s = Console.ReadLine(); 
            for (int i = s.Length-1; i >= 0; i--) 
            { 
                Console.Write(s[i]); 
            } 
             */ 
            /* 
            //将一句话中的单词反序输出 
            string s1 = Console.ReadLine(); 
            string[] words = s1.Split(' '); 
            for (int i = words.Length - 1; i >= 0; i--) 
            { 
                Console.Write(words[i]+" "); 
            } 
            Console.WriteLine("\n-------------"); 
 
            //从email中提取用户名与域名 
            string email = Console.ReadLine(); 
            int atIndex = email.IndexOf('@'); 
            string username = email.Substring(0,atIndex); 
            string 域名 = email.Substring(atIndex+1);  
            Console.WriteLine(username); 
            Console.WriteLine(域名); 
            */ 
            /* 
            //提出文件中的文章标题与作者 
            string[] lines = System.IO.File.ReadAllLines(@"..\..\2.txt", Encoding.Default); 
            foreach (string line in lines) 
            { 
                //string[] strs = line.Split(''); 
                string[] strs = line.Split(new char[]{' '},StringSplitOptions.RemoveEmptyEntries); 
                string title=strs[0];//标题 
                string author=strs[1];//作者 
                title=title.Substring(0,Math.Min(17,title.Length));//截取标题的前17个字符 
                //Math.Min用来计算两个数中的最小值  
                title = title + "..."; 
                Console.WriteLine("{0}|{1}",title,author); 
            } 
             */ 
 
            string value = GetConfigValue(@"..\..\3.ini","端口"); 
            Console.WriteLine(value); 
 
 
                Console.ReadKey(); 
        } 
 
        static string GetConfigValue(string filename, string itemName) 
        { 
            string[] lines = System.IO.File.ReadAllLines(filename,Encoding.Default); 
            foreach (string line in lines) 
            { 
                string[] strs = line.Split('='); 
                string name=strs[0]; 
                string value=strs[1]; 
                if (name.Trim() == itemName) 
                { 
                    return value.Trim();//Trim函数去除空格 
                } 
            } 
            return "错误"; 
        } 
 
 
    } 
} 
 

14. 字符串学习1

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace 字符串学习1 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            /* 
            String s = "Hello"; 
            string s1=s.ToLower(); 
            Console.WriteLine(s); 
            Console.WriteLine(s1); 
            s = s.ToLower();//并不是改变了字符串的内容,而是生成一个新的全部变成小写的字符串 
            Console.WriteLine(s); 
            Console.WriteLine(s.ToUpper()); 
 
            string s2="   a  b   "; 
            s2 = s2.Trim();//去掉两边的空格 
            Console.WriteLine("|{0}|",s2); 
            */ 
 
            //bool b=("abc"=="ABC"); 
            bool b = "abc".Equals("ABC",StringComparison.OrdinalIgnoreCase); 
            //Ignore:忽略,Case:大小写 
            Console.WriteLine(b); 
             
            //字符串比较 
            int i = "abc".CompareTo("123");//字符串比较 
            Console.WriteLine(i); 
 
            //字符串分隔 
            string s1 = "aaa,bbb,ccc,fadsfas.hello|f123,yes"; 
            string[] strs = s1.Split(',','.','|');//以逗号等多个分隔符分隔字符串 
            foreach (string item in strs) 
            { 
                Console.WriteLine(item); 
            } 
            Console.WriteLine("------------"); 
            string s2 = "aaa,bb,cc,12,3"; 
            string[] strs2 = s2.Split(new char[]{','},StringSplitOptions.RemoveEmptyEntries); 
            foreach (string item in strs2) 
            { 
                Console.WriteLine(item); 
            } 
            Console.WriteLine("------------"); 
            string s3 = "我是杰克逊我是麦克杰克逊"; 
            string[] strs3 = s3.Split(new string[]{"我是"},StringSplitOptions.RemoveEmptyEntries); 
            foreach (string item in strs3) 
            { 
                Console.WriteLine(item); 
            } 
 
            //读文件 
            Console.WriteLine("------------"); 
            string[] lines = System.IO.File.ReadAllLines(@"..\..\1.txt",Encoding.Default); 
            foreach (string item in lines) 
            { 
                //Console.WriteLine(item); 
                string[] strs4 = item.Split(new string[] { "|" }, StringSplitOptions.RemoveEmptyEntries); 
                Console.WriteLine(item+"\t"+strs4[2]); 
            } 
 
            Console.ReadKey(); 
        } 
    } 
} 
 

15. 字符串学习2

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace 字符串学习2 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            string s = "李时珍同志是一个好同志，是一个好医生，向李时珍学习"; 
            s = s.Replace("李时珍","李素丽");//替换字符串 
            Console.WriteLine(s); 
 
            string s1 = "http://www.baidu.com"; 
            string 域名 = s1.Substring(7);//取从第7个字符串开始的字字符串 
            Console.WriteLine(域名); 
 
            string s2 = s1.Substring(7,5);//从第7个位置截取5个字符 
            Console.WriteLine(s2); 
 
            string s3="我们的社会真和谐！"; 
            if(s3.Contains("社会")||s3.Contains("和谐")) 
            { 
                Console.WriteLine("含有敏感词汇，请文明用语！"); 
            } 
 
            if (s1.StartsWith("http://") || s1.StartsWith("https://")) 
            { 
                Console.WriteLine("是网址！"); 
            } 
            else 
            { 
                Console.WriteLine("不是网址！"); 
            } 
 
            string s4 = "你好，我是王某某"; 
            int i = s4.IndexOf("我是"); 
            int i2 = s4.IndexOf("你是"); 
            Console.WriteLine(i); 
            Console.WriteLine(i2); 
 
 
 
            Console.ReadKey(); 
        } 
    } 
}