//+ using System.Net;

//+ using System.IO;

static void Main(string[] args)

{

    //创建HTTP请求

    var request = (HttpWebRequest)WebRequest.Create("http://files.cnblogs.com/mgen/mgen_amalon.zip");

    //从第3个到第12个字节，共10个字节。（0是第一个字节）

    request.AddRange(, );

    try

    {

        //获取HTTP回应，注意HttpWebResponse继承自IDisposable

        using (var response = (HttpWebResponse)request.GetResponse())

        {

            if(response.StatusCode == HttpStatusCode.OK)

                throw new Exception("文件不支持Range部分下载");

            //设置接收信息的缓冲器

            var bytes = new byte[];

            Console.WriteLine("服务器回应：{0}", response.StatusCode);

            Console.WriteLine("文件大小：{0}", humanReadableByteCount(response.ContentLength, false));

            //获取回应的Stream（字节流）

            using (var stream = response.GetResponseStream())

            using (var outStream = new MemoryStream())

            {

                long recv = ;

                int count;

                //读取时注意实际接收数据大小

                while ((count = stream.Read(bytes, , )) != )

                {

                    Console.WriteLine("已经下载：{0}", humanReadableByteCount(recv += count, false));

                    //将接收数据写入

                    outStream.Write(bytes, , count);

                }

                //输出下载的内容

                Console.WriteLine(BitConverter.ToString(outStream.ToArray()));

            }

        }

    }

    catch (Exception ex)

    {

        Console.WriteLine("错误信息：{0}", ex.Message);

    }

}

//规格化输出大小的方法

//代码来自 / Original source

//http://stackoverflow.com/questions/3758606/how-to-convert-byte-size-into-human-readable-format-in-java

public static String humanReadableByteCount(long bytes, bool si)

{

    int unit = si ?  : ;

    if (bytes < unit) return bytes + " B";

    int exp = (int)(Math.Log(bytes) / Math.Log(unit));

    String pre = (si ? "kMGTPE" : "KMGTPE")[exp - ] + (si ? "" : "i");

    return String.Format("{0:F1} {1}B", bytes / Math.Pow(unit, exp), pre);

}