四个经典例题 - Fan帥帥

1、文件的复制

static void Main(string[] args)
 {
 FileStream filer = new FileStream(@"dotnet基础加强练习.txt", FileMode.Open, FileAccess.Read);
            FileStream filew = new FileStream(@"2.txt", FileMode.Create, FileAccess.Write);
            byte[]  by =new byte[100];
            int count = 0;
            using (filer)
            {
                using (filew)
                {
                    while ((count = filer.Read(by, 0, by.Length)) != 0)
                    {
                        filew.Write(by, 0, count);
                    }
                }
            }
}

2、正则表达式_检索（原文件见txt）

static void Main(string[] args)
        {
        List<string> list = new List<string>();
        string name = File.ReadAllText(@"百家姓.txt", Encoding.Default);
        MatchCollection ms = Regex.Matches(name, @"\s*〔(\w{1,2})〕\s*");
        foreach (Match m in ms)
        {
            if (m.Success)
            {
                list.Add(m.Groups[1].Value);
                Console.WriteLine(m.Groups[1].Value);
            }
        }
        Console.ReadKey();
        }

3、小说阅读器

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace 阅读器
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            string path = Path.GetFullPath("txt");
            Func(tv1.Nodes.Add("福尔摩斯全集"),path);

        }
        public void Func(TreeNode tn, string path)
        {
            string[] dirs = Directory.GetDirectories(path);
            string[] files = Directory.GetFiles(path, "*.txt");
            for (int i = 0; i < dirs.Length; i++)
            {
                Func(tn.Nodes.Add(Path.GetFileName(dirs[i])), dirs[i]);
            }
            for (int i = 0; i < files.Length; i++)
            {

                tn.Nodes.Add(Path.GetFileName(files[i])).Tag = files[i];
            }
        }
        private void tv1_AfterSelect(object sender, TreeViewEventArgs e)
        {
            if (e.Node.Tag != null)
            {
                tb1.Text = File.ReadAllText(e.Node.Tag.ToString(),Encoding.Default);
            }

        }
    }
}

4、面向对象计算器

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 
  6 namespace 计算器
  7 {
  8     class Factory
  9     {
 10         public static Operation jisuan(string oper, double num1, double num2)
 11         {
 12             switch (oper)
 13             {
 14                 case "+": return new Add(num1,num2);
 15                 case "-": return new Sub(num1, num2);
 16                 case "*": return new Mul(num1, num2);
 17                 case "/": return new Div(num1, num2);
 18                 default: return null;
 19 
 20             }
 21         }
 22     }
 23 }
 24 using System;
 25 using System.Collections.Generic;
 26 using System.Linq;
 27 using System.Text;
 28 
 29 namespace 计算器
 30 {
 31    abstract class Operation
 32     {
 33         public abstract double operate();
 34         double num1;
 35 
 36    public double Num1
 37         {
 38             get { return num1; }
 39             set { num1 = value; }
 40         }
 41         double num2;
 42 
 43         public double Num2
 44         {
 45             get { return num2; }
 46             set { num2 = value; }
 47         }
 48     }
 49     class Add : Operation
 50     {
 51         public Add(double num1, double num2)
 52         {
 53             this.Num1 = num1;
 54             this.Num2 = num2;
 55         }
 56         public override double operate()
 57         {
 58             return Num1 + Num2;
 59         }
 60     }
 61     class Sub : Operation
 62     {
 63         public Sub(double num1, double num2)
 64         {
 65             this.Num1 = num1;
 66             this.Num2 = num2;
 67         }
 68         public override double operate()
 69         {
 70             return Num1 - Num2;
 71         }
 72     }
 73     class Mul : Operation
 74     {
 75         public Mul(double num1, double num2)
 76         {
 77             this.Num1 = num1;
 78             this.Num2 = num2;
 79         }
 80         public override double operate()
 81         {
 82             return Num1 * Num2;
 83         }
 84     }
 85     class Div : Operation
 86     {
 87         public Div(double num1, double num2)
 88         {
 89             this.Num1 = num1;
 90             this.Num2 = num2;
 91         }
 92         public override double operate()
 93         {
 94             return Num1 / Num2;
 95         }
 96     }
 97 }
 98 
 99 using System;
100 using System.Collections.Generic;
101 using System.Linq;
102 using System.Text;
103 
104 namespace 计算器
105 {
106     class Program
107     {
108         static void Main(string[] args)
109         {
110             Console.WriteLine("输入一个数：");
111             int num1 = Convert.ToInt32(Console.ReadLine());
112             Console.WriteLine("输入一个数：");
113             int num2 = Convert.ToInt32(Console.ReadLine());
114             Console.WriteLine("输入一个数：");
115             string oper = Console.ReadLine();
116             Operation myoprate = Factory.jisuan(oper, num1, num2);
117             double res = 0;
118             if (myoprate != null)
119             {
120                 res = myoprate.operate();
121             }
122 
123             int num = 0;
124             Console.WriteLine("{0}{1}{2}={3}", num1, oper, num2, num);
125             Console.ReadKey();
126         }
127     }
128 }
129

posted on 2012-07-13 00:55 Fan帥帥阅读(198) 评论(0) 编辑收藏举报