c#实例源代码.doc

实例1-1】

using System;
using System.Collections.Generic;
using System.Text;
namespace _
{
class Program
{
static void Main(string[] args)
{
System.Console.WriteLine("恭喜你，学会了C#编程！");
System.Console.ReadLine();
}
}
}

【实例1-2】
private void Form1_Load(object sender, EventArgs e)
{
this.Text="这是一窗口！";
Label lbShow = new Label();
lbShow.Location = new Point(40,50);
lbShow.AutoSize = true;
lbShow.Text = "恭喜你学会编程了！";
this.Controls.Add(lbShow);

int[] x, y;
x = new int[5] { 1,2,3,4,5};
y = new int[5]
y = x;
foreach (int a in y)
{
lbShow.Text += a.ToString();
}
this.Controls.Add(lbShow);
}

【实例2-1】
using System;
using System.Windows.Forms;
namespace TestEnum
{
public partial class TestEnum : Form
{
//Visual Studio .Net自动生成的构造函数，后文示例将全部省略
public TestEnum()

{
InitializeComponent();
}

enum MyEnum { a = 101, b, c, d = 201, e, f }; //声明枚举型

private void TestEnum_Load(object sender, EventArgs e)
{
MyEnum x = MyEnum.f; //使用枚举型
MyEnum y = (MyEnum)202;
string result ="枚举数x的值为";
result += (int)x; //将x转换为整数
result += "\n枚举数y代表枚举元素" + y;
lblShow.Text = result;
}
}
}
【实例2-2】
using System;
using System.Windows.Forms;
namespace TestStru
{
public partial class TestStru : Form
{
struct Student //声明结构型
{
//声明结构型的数据成员
public int no;
public string name;
public char sex;
public int score;
//声明结构型的方法成员
public string Answer()
{
string result="该学生的信息如下：";
result += "\n学号：" + no; //"\n"为换行符
result += "\n姓名："+ name;
result += "\n性别："+ sex;
result += "\n成绩："+ score;
return result; //返回结果
}
};
private void TestEnum_Load(object sender, EventArgs e)
{
Student s; //使用结构型
s.no = 101;
s.name = "黄海";
s.sex = '男';
s.score = 540;
lblShow.Text = s.Answer(); //显示该生信息
lblShow.Text += "\n\n"+DateTime.Now; //显示当前时间
}
}
}
【实例2-3】
using System;
class TestConstant
{
static void Main(string[] args)
{
Console.WriteLine((0).GetType()); //有符号的32位整型常量
Console.WriteLine((0U).GetType()) //无符号的32位整型常量
Console.WriteLine((0L).GetType()); //64位的长整型常量
Console.WriteLine((0F).GetType()); //32位的浮点型常量
Console.WriteLine((0D).GetType()); //64位的双精度型常量
Console.WriteLine((0M).GetType()); //128位的小数型常量
Console.WriteLine(('0').GetType()); //16位的字符型常量
Console.WriteLine(("0").GetType()); //字符串常量
Console.WriteLine((0.0).GetType()); //64位的双精度型常量
Console.WriteLine((true).GetType()); //布尔型常量
Console.WriteLine(('\u0041').GetType()); //16位的字符型常量
Console.ReadLine();
}
}
【实例2-4】
using System;
class TestVariable
{
static void Main(string[] args)
{
int a = 12, b = 15, c, d, e;
c = a + b;
d = a - b;
e = a * b;
Console.WriteLine("c={0}\td={1}\te={2}", c, d, e);
}
}
【实例2-5】
using System;
using System.Windows.Forms;
namespace TestVariable
{
public partial class TestOperator : Form
{
private void TestVariable_Load(object sender, EventArgs e)
{
int i = 5, j = 5, p, q;
p = (i++) + (i++) + (i+);
q = (++j) + (++j) + (++j);
string t = " ";
lblShow.Text = i + t + j + t + p + t + q;
}
}
}
【实例2-6】
using System;
using System.Windows.Forms;

namespace TestVariable
{
public partial class TestOperator : Form
{
private void TestVariable_Load(object sender, EventArgs e)
{
int a, b = 5;
char c1 = 'A';
a = c1; //字符型转整型
float x = 3;
x += b; //整型转浮点型
lblShow.Text = "a=" + a; //整型转为字符串
lblShow.Text += "\nx=" + x; //浮点型转为字符串
}
}
}
【实例2-7】
using System;
using System.Windows.Forms;
namespace TestVariable
{
public partial class TestOperator : Form
{
private void TestVariable_Load(object sender, EventArgs e)
{
int i = 25, j = 12;
bool k;
string result = " i!=j的值为" + (i != j);
result += "\n i!=j && i>=j的值为" + (i != j && i >= j);
result += "\n i!=j && i>=j+20的值为" +(i != j && i >= j + 20);
result += "\n k = i!=j && i>=j的值为" + (i != j && i >= j);
lblShow.Text = result;
}
}
}
【实例2-8】
using System;
using System.Windows.Forms;
namespace TestInterface
{
public partial class TestInterface : Form
{
interface IStudent //声明接口
{
string Answer();
}
class Student : IStudent //声明类，以实现接口
{
public int no;
public string name;
public string Answer()
{
string result = "该学生信息如下：";
result += "\n学号：" + no;
result += "\n姓名：" + name;
return result;
}
}
private void btnOk_Click(object sender, EventArgs e)
{
Student a = new Student(); //定义并初始化变量a
a.no = Convert.ToInt32(txtStuID.Text);
a.name = txtName.Text;
lblShow.Text = a.Answer();
}
}
}
【实例2-9】
using System;
class HelloWorld
{
public string HelloCN()
{
return "你好！我是Jackson，中国人。";
}
public string HelloEN()
{
return "Hi! I am Jackson, a American.";
}
}

class TestDelegate
{
delegate string MyDelegate(); //声明委托
static void Main(string[] args)
{
HelloWorld hello = new HelloWorld(); //创建对象
MyDelegate h = new MyDelegate(hello.HelloCN); //创建委托对象并指向一个方法
Console.WriteLine(h()); //通过委托对象调用所指向的方法
h = new MyDelegate(hello.HelloEN);
Console.WriteLine(h());
}
}
【实例2-10】
using System;
class TestArray
{
static void Main(string[] args)
{
int[] x,y; //声明数组
x = new int[5] { 1,5,3,2,4}; //初始化数组
y = new int[5];
Array.Copy(x, y, 5); //将数组x的5个元素复制到数组y中

Console.WriteLine("成功地从数组x复制到数组y，数组y各元素值如下：");
for (int i = 0; i < y.Length; i++)
{
Console.Write("{0}\t", y[i]);
}

Array.Sort(x); //将数组x的元素排序
Console.WriteLine("\n经过排序后，数组x各元素值如下：");
for (int i = 0; i < x.Length; i++)
{
Console.Write("{0}\t", x[i]);
}

}
【实例2-11】
using System;
using System.Windows.Forms;
using System.Text;
namespace TestString
{
public partial class TestString : Form
{
private void TestString_Load(object sender, EventArgs e)
{
string s; //定义字符串变量
StringBuilder sb = new StringBuilder(); //创建可变字符串对象
sb.Append("北运"); //添加字符串
sb.Insert(1, "京奥"); //插入字符串
s = sb.ToString(); //把可变字符串对象转化为字符串
s = s.Insert(s.Length, "2008");
lblShow.Text ="\"" + s + "\"长度为" + s.Length;
}
}
}
【实例2-12】
using System;
using System.Windows.Forms;
namespace TestIf
{
public partial class TestInterface : Form
{
private void btnOk_Click(object sender, EventArgs e)
{
char c = Convert.ToChar(txtChar.Text); //字符串转换为字符型
if (Char.IsLetter(c))
{
if (Char.IsLower(c))
{
lblShow.Text = "这是一个小写字母。";
}
else if (Char.IsUpper(c))
{
lblShow.Text ="这是大写字母。";
}
else
{
lblShow.Text ="这是中文字符。";
}
}
else
{
lblShow.Text ="这不是语言文字。";
}
}
}
}
【实例2-13】
using System;
class TestSwitch
{
static void Main()
{
Console.WriteLine("服装类别： 1=休闲装 2=西装 3=皮衣");
Console.Write("请选择类别： ");
string s = Console.ReadLine();
int n = Convert.ToInt16(s); //把数字形式的字符串转化为整型数
int t,cost = 0; //t用来记录数量，cost用来记录金额
switch (n)
{
case 1:
Console.Write("休闲装的套数：");
s = Console.ReadLine();
t = Convert.ToInt16(s);
cost = t * 150;
break;
case 2:
Console.Write("西装的套数：");
s = Console.ReadLine();
t = Convert.ToInt16(s);
cost = t * 300;
break;
case 3:
Console.Write("皮衣的件数：");
s = Console.ReadLine();
t = Convert.ToInt16(s);
cost = t * 600;
break;
default:
Console.WriteLine("无效选择，请输入1、2或 3！");
break;
}
if (cost != 0)
{
Console.WriteLine("应付款{0}元.", cost);
}
Console.WriteLine("谢谢您的惠顾！");
}
}
【实例2-14】
using System;
using System.Windows.Forms;
namespace TestWhile
{
public partial class TestWhile : Form
{
public TestWhile() //Visual Studio .Net自动生成的构造函数
{
InitializeComponent();
}
private void TestWhile_Load(object sender, EventArgs e)
{
int i,sum;
i=1; //循环变量赋初值
sum=0;
while(i<=100) //循环条件
{ //循环体
sum=sum+i;
i++; //改变循环变量的值
}
MessageBox.Show("1到100的自然数之和="+sum); //显示计算结果
}
}
}
【实例2-15】
using System;
class TestDoWhile
{
static void Main()
{
char c;
int n = 0;
Console.WriteLine("请输入一行字符:");
do
{
c =(char)Console.Read()
if (c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z')
{
n++;
}
} while (c != '\n');
Console.WriteLine("该行中英文字母的个数为：{0}", n);
}
}

【实例2-16】
using System;
using System.Windows.Forms;
namespace TestFor
{
public partial class TestFor : Form
{
public TestFor()
{
InitializeComponent();
}
private void TestWhile_Load(object sender, EventArgs e)
{
int i;
int t;
long s1, s2;
s1 = t = 1; /*百万富翁第一天给陌生人的钱为1分*/
s2 = 100000; /*陌生人第一天给百万富翁的钱为十万元*/
for (i = 2; i <= 30; i++)
{
t = t * 2; /*百万富翁第i天给陌生人的钱*/
s1 = s1 + t; /*百万富翁第i天后共给陌生人的钱*/
s2 = s2 + 100000; /*陌生人第i天后共百万富翁的钱*/

}
s1 = s1 / 100; /*将百分富翁给陌生人的分币换成元*/
MessageBox.Show("百万富翁给陌生人"+s1+"元。\n陌生人给百万富翁"+s2+"元。" );
}
}
}

【实例2-17】
using System;
class TestForeach
{
static void Main()
{
string[] names = new string[5];
Console.WriteLine("请输入五个人的姓名：");
for (int i = 0; i < names.Length; i++)
{
names[i]=Console.ReadLine();
}
Console.WriteLine("已输入的姓名如下，请核对：");
foreach (string name in names)
{
Console.Write("{0}\t", name);
}
}
}
【实例2-18】
using System;
class TestForeach
{
static void Main()
{
int i, j, k;
for (i = 0; i < 7; i++) //i代表三角形的第i行
{
for (j = 6 - i; j >= 0; j--) //j表示在第i行左边的第j个空白字符
{
Console.Write(" ");
}
for (k = 0; k < 2 * i + 1; k++) //k表示在第i行的第k个星号字符，
{
Console.Write("*");
}
Console.Write("\n");
}
}
}
【实例2-21】
using System;
class TestGoto
{
static void Main()
{
char c;
for(int i=0;i<80;i++) //最多输入80个字符
{
c=(char)Console.Read();
if(c=='*') break; //一旦输入星号就结束
Console.Write(c);
}
}
}
【实例2-22】
using System;
class TestContinue
{
static void Main()
{
char ch_old,ch_new;
ch_old='.';
Console.WriteLine("请输入一串字符，以句号结尾：");
do
{
ch_new = (char)Console.Read();
if(ch_new == ch_old)
continue;
Console.Write(ch_new);
ch_old=ch_new;
}while(ch_new!='.');
Console.Write("\n");
}
}

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