C_Sharp基础.doc

C Sharp基础1. C#基础usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespaceConsoleApplication1classProgramstaticvoidMain(stringargs)/*Console.WriteLine(hello!);strings=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inti1=10;inti2=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，012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);stringboy=Console.ReadLine();Console.WriteLine(请输入女孩的名字);stringgirl=Console.ReadLine();Console.WriteLine(0爱1,boy,girl);*/*strings1=ab;Console.WriteLine(s1);strings2=anb;Console.WriteLine(s2);strings3=c:tempusernew1.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);strings4=Console.ReadLine();inti1=Convert.ToInt32(s4);Console.WriteLine(请输入第二个数字);/strings5=Console.ReadLine();/inti2=Convert.ToInt32(s5);inti2=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.csusingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespaceConsoleApplication1class人publicint年龄get;set;publicvoid说话()Console.WriteLine(年龄+说话);2. 字符串usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespaceCast入门classProgramstaticvoidMain(stringargs)/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);byteb=3;inti1=b;/b=i1;b=(byte)i1;strings=123;inti2=Convert.ToInt32(s);Console.WriteLine(i2);Console.ReadKey();/usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespace字符串classProgramstaticvoidMain(stringargs)/*charc1=a;charc2=b;strings1=hi;strings2=a;strings3=;strings4=hello;Console.WriteLine(s4.Length);/5,不是6,和C语言不同不考虑0Console.WriteLine(s41);charc3=s43;for(inti=0;i=0;i-)Console.WriteLine(s4i);/s40=y;/不能赋值*/*strings1=hello;charchars=s1.ToCharArray();/将字符串转换成字符数组chars0=a;strings2=newstring(chars);Console.WriteLine(s1);Console.WriteLine(s2);*/strings1=hello;strings10=s1;charchars=s1.ToCharArray();chars0=a;s1=newstring(chars);Console.WriteLine(s1);Console.WriteLine(s10);Console.ReadKey();3. 枚举学习usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespace枚举学习enumGenderMale,Female,Unknown;/声明枚举classProgramstaticvoidMain(stringargs)Genderg=Gender.Female;/枚举的意义在于限定变量的取值范围/Genderg1=Gender.Male;/*strings=Male;if(s=Male)Console.WriteLine(女);elseif(s=Unknown)Console.WriteLine(未知);esleConsole.WriteLine(非法输入！);*/4. 条件判断usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespace条件判断classProgramstaticvoidMain(stringargs)/*strings1=Console.ReadLine();intage=Convert.ToInt32(s1);if(age20)Console.WriteLine(成年人);/else/Console.WriteLine(小屁孩);/elseif(age10)Console.WriteLine(儿童);elseConsole.WriteLine(婴幼儿);*/*Console.WriteLine(请输入密码);strings1=Console.ReadLine();if(s1=888888)Console.WriteLine(密码正确);elseConsole.WriteLine(密码错误，请再输入一次);s1=Console.ReadLine();if(s1=888888)Console.WriteLine(密码正确);elseConsole.WriteLine(密码错误);*/*Console.WriteLine(请输入用户名：);stringusername=Console.ReadLine();Console.WriteLine(请输入密码：);stringpassword=Console.ReadLine();if(username=admin&password=888888)Console.WriteLine(正确);elseConsole.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);stringstrAge=Console.ReadLine();intage=Convert.ToInt32(strAge);if(age18)Console.WriteLine(可以查看！);elseif(age20)Console.WriteLine(成年人);/else/Console.WriteLine(小屁孩);/elseif(age10)Console.WriteLine(儿童);elseConsole.WriteLine(婴幼儿);*/*Console.WriteLine(请输入密码);strings1=Console.ReadLine();if(s1=888888)Console.WriteLine(密码正确);elseConsole.WriteLine(密码错误，请再输入一次);s1=Console.ReadLine();if(s1=888888)Console.WriteLine(密码正确);elseConsole.WriteLine(密码错误);*/*Console.WriteLine(请输入用户名：);stringusername=Console.ReadLine();Console.WriteLine(请输入密码：);stringpassword=Console.ReadLine();if(username=admin&password=888888)Console.WriteLine(正确);elseConsole.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);stringstrAge=Console.ReadLine();intage=Convert.ToInt32(strAge);if(age18)Console.WriteLine(可以查看！);elseif(age10&i2100&i2200|i210)return;Console.WriteLine(哈喽哇！);staticintReadInt()strings=Console.ReadLine();returnConvert.ToInt32(s);staticintMax(inti1,inti2)if(i1i2)returni1;returni2;staticintSum(intvalues)intsum=0;foreach(intiinvalues)sum=sum+i;returnsum;staticstringJoin(stringstrs,stringseperator)stringresult=;for(inti=0;i0)result=result+strsstrs.Length-1;returnresult;/usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespace函数2classProgramstaticvoidMain(stringargs)Console.WriteLine(01234,333,55,66,77,88,99,10,aaa);stringvalues=aaa,bbb,ccc;VFunc(aaa,111,222,33233,fasfsa,aaa);SayHello(tom,张大虎,狗蛋);Console.ReadKey();staticvoidVFunc(paramsstringvalues)/加params说明这个函数参数个数可变foreach(stringsinvalues)Console.WriteLine(s);staticvoidSayHello(stringname,paramsstringnicknames)Console.WriteLine(我的名字是0,name);foreach(stringnicknameinnicknames)Console.WriteLine(我的昵称：0,nickname);8. 函数重载usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespace函数重载classProgramstaticvoidMain(stringargs)SayHello(王大壮);SayHello(tom);SayHello(20);/strings=SayHello(jerry);SayHello(tom,littletom);Console.ReadKey();staticvoidSayHello(stringname)Console.WriteLine(大家好,我是:0,name);/*staticvoidSayHello(stringname)Console.WriteLine(Hello,Iam0,name);*/staticvoidSayHello(intage)Console.WriteLine(我0岁了,age);/*sta