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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作者：JackWang-CUMT

来源：51CTO