如何用.NET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：

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