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。