c# 断点续传

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Net;
using System.Text;

namespace DownloadSample
{
    /// 

    /// 
    /// 

    public class Downloader:IDisposable
    {
        /// 

        /// 默认存储路径
        /// 

        private static string defaultDirectory;
        /// 

        /// 默认存储路径
        /// 

        public static string DefaultDirectory
        {
            get
            {
                return defaultDirectory;
            }
            set 
            {
                defaultDirectory = value;
            }
        }
        /// 

        /// 链接地址
        /// 

        private string url;

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件      22984  2014-02-15 22:30  DownloadSample\bin\Debug\DownloadSample.vshost.exe

     文件        490  2012-06-02 22:34  DownloadSample\bin\Debug\DownloadSample.vshost.exe.manifest

     文件       8479  2014-02-15 22:23  DownloadSample\Downloader.cs

     文件       3829  2014-02-15 12:50  DownloadSample\DownloadSample.csproj

     文件        227  2014-02-14 14:02  DownloadSample\DownloadSample.csproj.user

     文件      12288  2014-02-14 15:26  DownloadSample\Files\1803700.html

     文件      11264  2014-02-14 15:35  DownloadSample\Files\18037001.html

     文件       4096  2014-02-14 15:37  DownloadSample\Files\180370011.html

     文件      25216  2014-02-14 14:51  DownloadSample\Files\3232955.html

     文件      25216  2014-02-14 14:52  DownloadSample\Files\32329551.html

     文件      25344  2014-02-14 14:54  DownloadSample\Files\323295511.html

     文件      25856  2014-02-14 14:56  DownloadSample\Files\3232955111.html

     文件      25600  2014-02-14 15:05  DownloadSample\Files\32329551111.html

     文件      25728  2014-02-14 15:08  DownloadSample\Files\323295511111.html

     文件      25600  2014-02-14 15:10  DownloadSample\Files\3232955111111.html

     文件      29696  2014-02-14 15:10  DownloadSample\Files\32329551111111.html

     文件      29696  2014-02-14 15:18  DownloadSample\Files\323295511111111.html

     文件      29696  2014-02-14 15:21  DownloadSample\Files\3232955111111111.html

     文件      24576  2014-02-14 15:57  DownloadSample\Files\32329551111111111.html

     文件          0  2014-02-14 14:16  DownloadSample\Files\index.html

     文件      16512  2014-02-14 14:19  DownloadSample\Files\index1.html

     文件       3200  2014-02-15 20:26  DownloadSample\Form1.cs

     文件       4763  2014-02-15 20:26  DownloadSample\Form1.Designer.cs

     文件       5817  2014-02-15 20:26  DownloadSample\Form1.resx

     文件       5359  2014-02-15 20:20  DownloadSample\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache

     文件       6986  2014-02-15 22:25  DownloadSample\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache

     文件        276  2014-02-14 15:18  DownloadSample\obj\x86\Debug\GenerateResource.read.1.tlog

     文件        718  2014-02-14 15:18  DownloadSample\obj\x86\Debug\GenerateResource.write.1.tlog

     文件       4608  2014-02-15 12:50  DownloadSample\obj\x86\Debug\TempPE\Properties.Resources.Designer.cs.dll

     文件       1808  2014-02-15 12:49  DownloadSample\obj\x86\Debug\WindowsFormsApplication1.csproj.FileListAbsolute.txt

............此处省略24个文件信息