二维码是用某种特定的几何图形按一定规律在平面(二维方向上)分布的黑白相间的图形记录数据符号信息的,国外对二维码技术的研究始于20世纪80年代 末,在二维码符号表示技术研究方面已研制出多种码制,常见的有PDF417、QR Code、Code 49、Code 16K、Code One等。二维码技术已经被广泛应用于公安、外交、军事等部门对各类证件的管理,而且也将二维码应用于海关、税务等部门对各类报表和票据的管理,商业、交 通运输等部门对商品及货物运输的管理、邮政部门对邮政包裹的管理、工业生产领域对工业生产线的自动化管理。

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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:
- namespace WinQRCode
 - {
 - partial class Form1
 - {
 - ///
 - /// 必需的设计器变量。
 - ///
 - private System.ComponentModel.IContainer components = null;
 - ///
 - /// 清理所有正在使用的资源。
 - ///
 - /// 如果应释放托管资源,为 true;否则为 false。
 - 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
 - ///
 - /// 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。
 - ///
 - 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();
 - }
 - ///
 - /// 编码
 - ///
 - ///
 - ///
 - 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;
 - }
 - }
 - ///
 - /// 解码
 - ///
 - ///
 - ///
 - 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:
 
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