多线程下载控制台（断点续流）
............................\ConsoleApplication27
............................\....................\bin
............................\....................\...\Debug
............................\....................\...\.....\0.dat
............................\....................\...\.....\1.dat
............................\....................\...\.....\2.dat
............................\....................\...\.....\3.dat
............................\....................\...\.....\4.dat
............................\....................\...\.....\ConsoleApplication27.exe
............................\....................\...\.....\ConsoleApplication27.pdb
............................\....................\...\.....\ConsoleApplication27.vshost.exe
............................\....................\ConsoleApplication27.csproj
............................\....................\ConsoleApplication27.csproj.user
............................\....................\obj
............................\....................\...\ConsoleApplication27.csproj.FileList.txt
............................\....................\...\Debug
............................\....................\...\.....\ConsoleApplication27.exe
............................\....................\...\.....\ConsoleApplication27.pdb
............................\....................\...\.....\TempPE
............................\....................\Program.cs
............................\....................\Properties
............................\....................\..........\AssemblyInfo.cs
............................\ConsoleApplication27.sln