C#窗体三种方法生成二维码并打印的小程序

利用三种方式实现生成二维码，并且打印的功能

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WindowsFormsApplication2
{
    class Docementbase
    {
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2018-01-17 09:07  QR\
     目录           0  2018-01-17 09:07  QR\.vs\
     目录           0  2018-01-17 09:07  QR\.vs\WindowsFormsApplication2\
     目录           0  2018-01-17 09:07  QR\.vs\WindowsFormsApplication2\v14\
     文件       57856  2018-02-03 10:58  QR\.vs\WindowsFormsApplication2\v14\.suo
     目录           0  2018-02-03 10:56  QR\WindowsFormsApplication2\
     文件        1039  2018-01-17 09:07  QR\WindowsFormsApplication2.sln
     文件         189  2018-01-17 09:07  QR\WindowsFormsApplication2\App.config
     目录           0  2018-01-17 17:01  QR\WindowsFormsApplication2\bin\
     目录           0  2018-01-18 08:24  QR\WindowsFormsApplication2\bin\Debug\
     文件       98816  2016-12-28 14:11  QR\WindowsFormsApplication2\bin\Debug\Gma.QrCodeNet.Encoding.dll
     文件     6205440  2013-01-30 17:01  QR\WindowsFormsApplication2\bin\Debug\ThoughtWorks.QRCode.dll
     文件       13312  2018-02-03 10:56  QR\WindowsFormsApplication2\bin\Debug\WindowsFormsApplication2.exe
     文件         189  2018-01-17 09:07  QR\WindowsFormsApplication2\bin\Debug\WindowsFormsApplication2.exe.config
     文件       24064  2018-02-03 10:56  QR\WindowsFormsApplication2\bin\Debug\WindowsFormsApplication2.pdb
     文件       22696  2018-02-03 10:56  QR\WindowsFormsApplication2\bin\Debug\WindowsFormsApplication2.vshost.exe
     文件         189  2018-01-17 09:07  QR\WindowsFormsApplication2\bin\Debug\WindowsFormsApplication2.vshost.exe.config
     文件         490  2014-01-13 21:31  QR\WindowsFormsApplication2\bin\Debug\WindowsFormsApplication2.vshost.exe.manifest
     文件      425984  2016-12-30 15:20  QR\WindowsFormsApplication2\bin\Debug\zxing.dll
     目录           0  2018-01-17 17:01  QR\WindowsFormsApplication2\bin\Release\
     文件       98816  2016-12-28 14:11  QR\WindowsFormsApplication2\bin\Release\Gma.QrCodeNet.Encoding.dll
     文件     6205440  2013-01-30 17:01  QR\WindowsFormsApplication2\bin\Release\ThoughtWorks.QRCode.dll
     文件       11264  2018-01-17 17:01  QR\WindowsFormsApplication2\bin\Release\WindowsFormsApplication2.exe
     文件         189  2018-01-17 09:07  QR\WindowsFormsApplication2\bin\Release\WindowsFormsApplication2.exe.config
     文件       22016  2018-01-17 17:01  QR\WindowsFormsApplication2\bin\Release\WindowsFormsApplication2.pdb
     文件      425984  2016-12-30 15:20  QR\WindowsFormsApplication2\bin\Release\zxing.dll
     目录           0  2018-01-17 09:23  QR\WindowsFormsApplication2\dll\
     文件       98816  2016-12-28 14:11  QR\WindowsFormsApplication2\dll\Gma.QrCodeNet.Encoding.dll
     文件     6205440  2013-01-30 17:01  QR\WindowsFormsApplication2\dll\ThoughtWorks.QRCode.dll
     文件      425984  2016-12-30 15:20  QR\WindowsFormsApplication2\dll\zxing.dll
     文件         206  2018-01-17 16:27  QR\WindowsFormsApplication2\Docementbase.cs
............此处省略36个文件信息