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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：
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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。
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