//引入命名空间
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace StreamReadWrite
{
    class Program
    {
        static void Main(string[] args)
        {
            // Get the directories currently on the C drive.
            DirectoryInfo[] cDirs = new DirectoryInfo(@"c:\").GetDirectories();

            // Write each directory name to a file.
            using (StreamWriter sw = new StreamWriter("CDriveDirs.txt"))
            {
                foreach (DirectoryInfo dir in cDirs)
                {
                    sw.WriteLine(dir.Name);
                }
            }

            // Read and show each line from the file.
            string line = "";
            using (StreamReader sr = new StreamReader("CDriveDirs.txt"))
            {
                while ((line = sr.ReadLine()) != null)
                {
                    Console.WriteLine(line);
                }
            }
        }
    }
}

//引入命名空间
using System;
using System.IO;


public class MyStreamWriterReader {
    static void Main(string[] args) {
        StreamWriter writer = new StreamWriter("reminders.txt");
        writer.WriteLine("...");
        writer.WriteLine("Don't forget these numbers:");
        for (int i = 0; i < 10; i++)
            writer.Write(i + " ");

        writer.Write(writer.NewLine);

        writer.Close();
        StreamReader sr = new StreamReader("reminders.txt");
        string input = null;
        while ((input = sr.ReadLine()) != null) {
            Console.WriteLine(input);
        }
    }
}

//引入命名空间
using System;
using System.IO;
using System.Text;

class MainClass {
    static void Main() {
        using (FileStream fs = new FileStream("test.txt", FileMode.Create)) {
            using (StreamWriter w = new StreamWriter(fs, Encoding.UTF8)) {
                w.WriteLine(124.23M);
                w.WriteLine("Test string");
                w.WriteLine('!');
            }
        }
        using (FileStream fs = new FileStream("test.txt", FileMode.Open)) {
            using (StreamReader r = new StreamReader(fs, Encoding.UTF8)) {
                Console.WriteLine(Decimal.Parse(r.ReadLine()));
                Console.WriteLine(r.ReadLine());
                Console.WriteLine(Char.Parse(r.ReadLine()));
            }
        }
    }
}

//引入命名空间
using System;
using System.IO;
using System.Text;

class MainClass {
    static void Main() {
        using (FileStream fs = new FileStream("test.txt", FileMode.Create)) {
            using (StreamWriter w = new StreamWriter(fs, Encoding.UTF8)) {
                w.WriteLine(124.23M);
                w.WriteLine("Test string");
                w.WriteLine('!');
            }
        }
        Console.WriteLine("Press Enter to read the information.");
        Console.ReadLine();
        using (FileStream fs = new FileStream("test.txt", FileMode.Open)) {
            using (StreamReader r = new StreamReader(fs, Encoding.UTF8)) {
                Console.WriteLine(Decimal.Parse(r.ReadLine()));
                Console.WriteLine(r.ReadLine());
                Console.WriteLine(Char.Parse(r.ReadLine()));
            }
        }
    }
}