.net I/O操作 导图_.NET_编程开发_程序员俱乐部

稍微总结下，System.IO提供了四种类型来实现，对单个文件和计算机目录结构的操作。Directory和File通过静态成员实现建立、删除、复制和移动操作（上图没有提及）。而FileInfo和DirectryInfo类型则通过实例级方法来实现类似的功能，并且更加推荐使用，原因是它们的成员方法返回强类型的对象。

FileStream和StreamReader/StreamWriter的主要区别在于，FileStream操作的是字节/字节数组；而StreamReader/StreamWriter可以操作字符串。

class="code">public  void CreateByteFile()
{
    var fileInfo = new FileInfo(string.Format(@"{0}\Test.dat", Environment.CurrentDirectory));
    using (var fileStream = fileInfo.Open(FileMode.OpenOrCreate,FileAccess.ReadWrite,FileShare.None))
    {
        const string msg = "Hello";
        var msgAsByteArray = Encoding.Default.GetBytes(msg);
        fileStream.Write(msgAsByteArray,0,msgAsByteArray.Length);
        fileStream.Position = 0;
        Console.WriteLine("Your Message as an array of bytes:\n");
        var bytesFormFile = new byte[msgAsByteArray.Length];
        for (var i = 0; i < msgAsByteArray.Length; i++)
        {
            bytesFormFile[i] =(byte) fileStream.ReadByte();
            Console.WriteLine(bytesFormFile[i]);
        }
        Console.WriteLine("\n Decoded Message: ");
        Console.WriteLine(Encoding.Default.GetString(bytesFormFile));
    }
}

public void WriteCharFile()
{
    var fileInfo = new FileInfo(string.Format( "{0}reminders.txt", AppDomain.CurrentDomain.BaseDirectory));
    using (var streamWriter = fileInfo.CreateText())
    {
        streamWriter.WriteLine("Don't forget Mother's Day this year...");
        streamWriter.WriteLine("Don't forget Father's Day this year...");
        streamWriter.WriteLine("Don't forget These numbers:");
        for (var i = 0; i < 10; i++)
        {
                streamWriter.Write(i + "    ");
        }
        streamWriter.Write(streamWriter.NewLine);
    }
    Console.WriteLine("Created file and wrote some thoughts...");
    Console.ReadKey();
}