如何用.NET生成二维码？

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。

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：

水平有限，望各位园友不吝赐教！如果觉得不错，请疯狂的点击推荐和关注！

作者：JackWang-CUMT

来源：51CTO

时间： 2024-08-02 07:01:37

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