用.NET如何生成二维码

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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 
  { 
    /// <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。