用.NET如何生成二维码

下面介绍一下如何用.net生成二维码（qr code码制），下面给出详细步骤：

1、新建一个window应用程序，然后引入.net二维码类库（开源的类库，可从网上下载）：

2、构建ui界面，代码如下：

namespace winqrcode 
{ 
  partial class form1 
  { 
    /// <summary> 
    /// 必需的设计器变量。 
    /// </summary> 
    private system.componentmodel.icontainer components = null; 
 
    /// <summary> 
    /// 清理所有正在使用的资源。 
    /// </summary> 
    /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param> 
    protected override void dispose(bool disposing) 
    { 
      if (disposing && (components != null)) 
      { 
        components.dispose(); 
      } 
      base.dispose(disposing); 
    } 
 
    #region windows 窗体设计器生成的代码 
 
    /// <summary> 
    /// 设计器支持所需的方法 - 不要 
    /// 使用代码编辑器修改此方法的内容。 
    /// </summary> 
    private void initializecomponent() 
    { 
      this.button1 = new system.windows.forms.button(); 
      this.button2 = new system.windows.forms.button(); 
      this.picturebox1 = new system.windows.forms.picturebox(); 
      this.label1 = new system.windows.forms.label(); 
      this.textbox1 = new system.windows.forms.textbox(); 
      this.label2 = new system.windows.forms.label(); 
      this.lbl解码信息 = new system.windows.forms.label(); 
      ((system.componentmodel.isupportinitialize)(this.picturebox1)).begininit(); 
      this.suspendlayout(); 
      // 
      // button1 
      // 
      this.button1.location = new system.drawing.point(446, 31); 
      this.button1.margin = new system.windows.forms.padding(4, 5, 4, 5); 
      this.button1.name = "button1"; 
      this.button1.size = new system.drawing.size(103, 37); 
      this.button1.tabindex = 0; 
      this.button1.text = "编码"; 
      this.button1.usevisualstylebackcolor = true; 
      this.button1.click += new system.eventhandler(this.button1_click); 
      // 
      // button2 
      // 
      this.button2.location = new system.drawing.point(446, 81); 
      this.button2.margin = new system.windows.forms.padding(4, 5, 4, 5); 
      this.button2.name = "button2"; 
      this.button2.size = new system.drawing.size(103, 37); 
      this.button2.tabindex = 1; 
      this.button2.text = "解码"; 
      this.button2.usevisualstylebackcolor = true; 
      this.button2.click += new system.eventhandler(this.button2_click); 
      // 
      // picturebox1 
      // 
      this.picturebox1.location = new system.drawing.point(23, 117); 
      this.picturebox1.margin = new system.windows.forms.padding(4, 5, 4, 5); 
      this.picturebox1.name = "picturebox1"; 
      this.picturebox1.size = new system.drawing.size(279, 253); 
      this.picturebox1.sizemode = system.windows.forms.pictureboxsizemode.stretchimage; 
      this.picturebox1.tabindex = 2; 
      this.picturebox1.tabstop = false; 
      // 
      // label1 
      // 
      this.label1.autosize = true; 
      this.label1.location = new system.drawing.point(18, 39); 
      this.label1.margin = new system.windows.forms.padding(4, 0, 4, 0); 
      this.label1.name = "label1"; 
      this.label1.size = new system.drawing.size(69, 25); 
      this.label1.tabindex = 3; 
      this.label1.text = "信息："; 
      // 
      // textbox1 
      // 
      this.textbox1.location = new system.drawing.point(95, 37); 
      this.textbox1.margin = new system.windows.forms.padding(4, 5, 4, 5); 
      this.textbox1.name = "textbox1"; 
      this.textbox1.size = new system.drawing.size(333, 31); 
      this.textbox1.tabindex = 4; 
      // 
      // label2 
      // 
      this.label2.autosize = true; 
      this.label2.location = new system.drawing.point(18, 81); 
      this.label2.margin = new system.windows.forms.padding(4, 0, 4, 0); 
      this.label2.name = "label2"; 
      this.label2.size = new system.drawing.size(88, 25); 
      this.label2.tabindex = 5; 
      this.label2.text = "二维码："; 
      // 
      // lbl解码信息 
      // 
      this.lbl解码信息.autosize = true; 
      this.lbl解码信息.location = new system.drawing.point(101, 81); 
      this.lbl解码信息.margin = new system.windows.forms.padding(4, 0, 4, 0); 
      this.lbl解码信息.name = "lbl解码信息"; 
      this.lbl解码信息.size = new system.drawing.size(0, 25); 
      this.lbl解码信息.tabindex = 6; 
      // 
      // form1 
      // 
      this.autoscaledimensions = new system.drawing.sizef(11f, 24f); 
      this.autoscalemode = system.windows.forms.autoscalemode.font; 
      this.clientsize = new system.drawing.size(572, 384); 
      this.controls.add(this.lbl解码信息); 
      this.controls.add(this.label2); 
      this.controls.add(this.textbox1); 
      this.controls.add(this.label1); 
      this.controls.add(this.picturebox1); 
      this.controls.add(this.button2); 
      this.controls.add(this.button1); 
      this.font = new system.drawing.font("微软雅黑", 10.8f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((byte)(134))); 
      this.margin = new system.windows.forms.padding(4, 5, 4, 5); 
      this.name = "form1"; 
      this.text = "二维码"; 
      ((system.componentmodel.isupportinitialize)(this.picturebox1)).endinit(); 
      this.resumelayout(false); 
      this.performlayout(); 
 
    } 
 
    #endregion 
 
    private system.windows.forms.button button1; 
    private system.windows.forms.button button2; 
    private system.windows.forms.picturebox picturebox1; 
    private system.windows.forms.label label1; 
    private system.windows.forms.textbox textbox1; 
    private system.windows.forms.label label2; 
    private system.windows.forms.label lbl解码信息; 
  } 
} 

图形如下所示：

 

3、编写 编码和解码按钮事件，进行编码和解码处理：

using system; 
using system.collections.generic; 
using system.componentmodel; 
using system.data; 
using system.drawing; 
using system.linq; 
using system.text; 
using system.windows.forms; 
 
namespace winqrcode 
{ 
  using thoughtworks.qrcode.codec; 
  using thoughtworks.qrcode.codec.data; 
  using thoughtworks.qrcode.codec.util; 
  using system.io; 
  using pdftoimage; 
  public partial class form1 : form 
  { 
    public form1() 
    { 
      initializecomponent(); 
    } 
    /// <summary> 
    /// 编码 
    /// </summary> 
    /// <param name="sender"></param> 
    /// <param name="e"></param> 
    private void button1_click(object sender, eventargs e) 
    { 
      if (this.textbox1.text != "") 
      { 
        cursor.current = cursors.waitcursor; 
        if (textbox1.text.trim() == string.empty) 
        { 
          messagebox.show("不能为空."); 
          return; 
        } 
        qrcodeencoder qrcodeencoder = new qrcodeencoder();        
        qrcodeencoder.qrcodeencodemode = qrcodeencoder.encode_mode.byte; 
        qrcodeencoder.qrcodescale = 4; 
        qrcodeencoder.qrcodeversion = 7;       
        qrcodeencoder.qrcodeerrorcorrect = qrcodeencoder.error_correction.m;        
        system.drawing.image image; 
        string data = textbox1.text; 
        //编码 
        image = qrcodeencoder.encode(data); 
        //图片显示 
        this.picturebox1.image = image; 
        cursor.current = cursors.default; 
 
      } 
    } 
    /// <summary> 
    /// 解码 
    /// </summary> 
    /// <param name="sender"></param> 
    /// <param name="e"></param> 
    private void button2_click(object sender, eventargs e) 
    { 
      cursor.current = cursors.waitcursor; 
      bitmap b = this.picturebox1.image as bitmap; 
      try 
      { 
        qrcodedecoder decoder = new qrcodedecoder(); 
        //解码 
        string decodedstring = decoder.decode(new qrcodebitmapimage(b)); 
        //显示解码信息 
        this.lbl解码信息.text += decodedstring ; 
      } 
      catch (exception ex) 
      { 
        messagebox.show(ex.message); 
      } 
      cursor.current = cursors.default; 
    } 
 
    private void form1_load(object sender, eventargs e) 
    { 
 
    } 
  } 
} 

4、编译运行，如下图：

以上就是关于使用.net生成二维码的大概思路，还有许多不足之处，希望大家多提建议，或者自己进行创新修改。