C#如何用ThoughtWorks生成二维码

       在现在的项目中，较多的使用到二维码，前面介绍过一篇使用gma生成二维码的操作，现在介绍一个第三方组件，主要介绍生成二维码，二维码的解析，以及对二维码的相关信息的选择，现在介绍thoughtworks用于生成二维码，本随笔采用.net4.5和c#6.0语法,也可以进行查看thoughtworks的底层源码。

1.生成二维码：

    /// <summary>
    /// 生成二维码
    /// </summary>
    /// <param name="content">带生成二维码的字符串</param>
    /// <param name="path">路径</param>
    /// <returns></returns>
    public static string createhoughtworksqrcode(string content, string path)
    {
      if (string.isnullorempty(content))
      {
        throw new argumentnullexception(content);
      }
      if (string.isnullorempty(path))
      {
        throw new argumentnullexception(path);
      }
      var qrcodeencoder = new qrcodeencoder
      {
        qrcodeencodemode = qrcodeencoder.encode_mode.byte,
        qrcodescale = 4,
        qrcodeversion = 8,
        qrcodeerrorcorrect = qrcodeencoder.error_correction.m
      };
      image image = qrcodeencoder.encode(content);
      var filename = datetime.now.tostring("yyyymmddhhmmssfff") + ".jpg";
      var filepath = string.format("{0}{1}", path, filename);
      filestream fs = null;
      try
      {
        fs = new filestream(filepath, filemode.openorcreate, fileaccess.write);
        image.save(fs, system.drawing.imaging.imageformat.jpeg);
      }
      catch (ioexception ex)
      {
        throw new ioexception(ex.message);
      }
      finally
      {
        if (fs != null) fs.close();
        image.dispose();
      }
      return codedecoder(filepath);
    }

2.解析二维码：

    /// <summary>
    /// 二维码解码
    /// </summary>
    /// <param name="filepath">图片路径</param>
    /// <returns></returns>
    public static string codedecoder(string filepath)
    {
      if (string.isnullorempty(filepath))
      {
        throw new argumentnullexception(filepath);
      }
      try
      {
        if (!system.io.file.exists(filepath))
          return null;
        var mybitmap = new bitmap(image.fromfile(filepath));
        var decoder = new qrcodedecoder();
        var decodedstring = decoder.decode(new qrcodebitmapimage(mybitmap));
        return decodedstring;
      }
      catch (exception ex)
      {
        throw new exception(ex.message);
      }
    }

3.选择生成的二维码参数：

    /// <summary>
    /// 选择生成二维码的相关类型
    /// <param name="strdata">要生成的文字或者数字，支持中文。如： "4408810820 深圳－广州" 或者：4444444444</param>
    /// <param name="qrencoding">三种尺寸：byte ，alpha_numeric，numeric</param>
    /// <param name="level">大小：l m q h</param>
    /// <param name="version">版本：如 8</param>
    /// <param name="scale">比例：如 4</param>
    /// <returns></returns>
    /// </summary>
    public void createcode_choose(string strdata, string qrencoding, string level, int version, int scale)
    {
      var qrcodeencoder = new qrcodeencoder();
      var encoding = qrencoding;
      switch (encoding)
      {
        case "byte":
          qrcodeencoder.qrcodeencodemode = qrcodeencoder.encode_mode.byte;
          break;
        case "alphanumeric":
          qrcodeencoder.qrcodeencodemode = qrcodeencoder.encode_mode.alpha_numeric;
          break;
        case "numeric":
          qrcodeencoder.qrcodeencodemode = qrcodeencoder.encode_mode.numeric;
          break;
        default:
          qrcodeencoder.qrcodeencodemode = qrcodeencoder.encode_mode.byte;
          break;
      }

      qrcodeencoder.qrcodescale = scale;
      qrcodeencoder.qrcodeversion = version;
      switch (level)
      {
        case "l":
          qrcodeencoder.qrcodeerrorcorrect = qrcodeencoder.error_correction.l;
          break;
        case "m":
          qrcodeencoder.qrcodeerrorcorrect = qrcodeencoder.error_correction.m;
          break;
        case "q":
          qrcodeencoder.qrcodeerrorcorrect = qrcodeencoder.error_correction.q;
          break;
        default:
          qrcodeencoder.qrcodeerrorcorrect = qrcodeencoder.error_correction.h;
          break;
      }
      image image = null;
      filestream fs = null;
      try
      {
        //文字生成图片
        image = qrcodeencoder.encode(strdata);
        var filename = datetime.now.tostring("yyyymmddhhmmssfff") + ".jpg";
        var filepath = httpcontext.current.server.mappath(@"~\upload") + "\\" + filename;
        fs = new filestream(filepath, filemode.openorcreate, fileaccess.write);
        image.save(fs, system.drawing.imaging.imageformat.jpeg);
      }
      catch (ioexception ex)
      {
        throw new ioexception(ex.message);
      }
      finally
      {
        if (fs != null) fs.close();
        if (image != null) image.dispose();
      }
    }

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