20110224C#程序员参考手册

Stream类是所有字节流的基类，它定义了用来读写字节数据的基本方法。

            /*
             * BufferedStream:类为其他的I/O流动读和写提供了一个内部的缓冲区，
             * 一个缓冲区就是用来临时存储数据的一块内存，在把数据从文件读出或者把数据写入文件时，
             * 读写的数据已经实现了缓冲。
             * FileStream:能够访问文件I/O流，它允许文件的读取或者写入
             */
            int c;
            StringBuilder sb = new StringBuilder();
            BufferedStream buffered = new BufferedStream(new FileStream(@"F:\demo.txt", FileMode.Open));
            while ((c = buffered.ReadByte()) != -1)
            {
                sb.Append((char)c);
            }
            Console.WriteLine(sb.ToString());
            buffered.Close();

using System;
using System.IO;
using System.Text;

class Test
{

    public static void Main()
    {
        string path = @"c:\temp\MyTest.txt";

        // Delete the file if it exists.
        if (File.Exists(path))
        {
            File.Delete(path);
        }

        //Create the file.
        using (FileStream fs = File.Create(path))
        {
            AddText(fs, "This is some text");
            AddText(fs, "This is some more text,");
            AddText(fs, "\r\nand this is on a new line");
            AddText(fs, "\r\n\r\nThe following is a subset of characters:\r\n");

            for (int i=1;i < 120;i++)
            {
                AddText(fs, Convert.ToChar(i).ToString());

            }
        }

        //Open the stream and read it back.
        using (FileStream fs = File.OpenRead(path))
        {
            byte[] b = new byte[1024];
            UTF8Encoding temp = new UTF8Encoding(true);
            while (fs.Read(b,0,b.Length) > 0)
            {
                Console.WriteLine(temp.GetString(b));
            }
        }
    }

    private static void AddText(FileStream fs, string value)
    {
        byte[] info = new UTF8Encoding(true).GetBytes(value);
        fs.Write(info, 0, info.Length);
    }
}

打开一个文件（如果文件不存在则创建该文件）并将信息追加到文件末尾。

using System;
using System.IO;
using System.Text;

class FSOpenWrite
{
    public static void Main()
    {
        FileStream fs=new FileStream("c:\\Variables.txt", FileMode.Append, FileAccess.Write, FileShare.Write);
        fs.Close();
        StreamWriter sw=new StreamWriter("c:\\Variables.txt", true, Encoding.ASCII);
        string NextLine="This is the appended line.";
        sw.Write(NextLine);
        sw.Close();
    }
}

说明：代码选自http://msdn.microsoft.com/zh-cn/library/system.io.filestream.aspx