背景

二维码是越来越流行了，很多地方都有可能是使用到。如果是静态的二维码还是比较好处理的，通过在线工具就可以直接生成一张二维码图片，比如：草料二维码。但有的时候是需要动态生成的（根据动态数据生成），这个使用在线就工具就无法实现了。最好是能在代码中直接生成一个二维码图片，这里我就介绍下使用QRCoder类库在代码中生成二维码。

网上生成二维码的组件还是挺多的，但是真正好用且快速的却不多。QRCoder就是我在众多中找到的，它的生成速度快、而且使用也相当方便。

开始编码

1、安装 QRCoder组件。在项目上通过NuGet包管理器来安装，搜索名称：QRCoder

2、在代码中添加引用：using QRCoder;

3、编码生成

pictureBoxQRCode.BackgroundImage = qrCode.GetGraphic( 20, Color.Black, Color.White, GetIconBitmap, ( int) iconSize.Value);

this.pictureBoxQRCode.Size = newSystem.Drawing.Size(pictureBoxQRCode.Width, pictureBoxQRCode.Height); //Set the SizeMode to center the image.this.pictureBoxQRCode.SizeMode = PictureBoxSizeMode.CenterImage;

pictureBoxQRCode.SizeMode = PictureBoxSizeMode.StretchImage;}}}}

运行效果

上面代码运行的结果

加个Logo吧

还可以加上logo

完整代码

namespaceQRCoderDemo{publicpartialclassForm1: Form{publicForm1( ) {InitializeComponent;}

privatevoidForm1_Load( objectsender, EventArgs e ) {comboBoxECC.SelectedIndex = 0; //Pre-select ECC level "L"RenderQrCode;}

展开全文

privatevoidbuttonGenerate_Click( objectsender, EventArgs e ) {RenderQrCode;}

privatevoidRenderQrCode( ) {stringlevel = comboBoxECC.SelectedItem.ToString; QRCodeGenerator.ECCLevel eccLevel = (QRCodeGenerator.ECCLevel)(level == "L"? 0: level == "M"? 1: level == "Q"? 2: 3); using(QRCodeGenerator qrGenerator = newQRCodeGenerator) {using(QRCodeData qrCodeData = qrGenerator.CreateQrCode(textBoxQRCode.Text, eccLevel)) {using(QRCode qrCode = newQRCode(qrCodeData)) {

pictureBoxQRCode.BackgroundImage = qrCode.GetGraphic( 20, Color.Black, Color.White, GetIconBitmap, ( int) iconSize.Value);

this.pictureBoxQRCode.Size = newSystem.Drawing.Size(pictureBoxQRCode.Width, pictureBoxQRCode.Height); //Set the SizeMode to center the image.this.pictureBoxQRCode.SizeMode = PictureBoxSizeMode.CenterImage;

pictureBoxQRCode.SizeMode = PictureBoxSizeMode.StretchImage;}}}}

privateBitmap GetIconBitmap( ) {Bitmap img = null; if(iconPath.Text.Length > 0) {try{img = newBitmap(iconPath.Text); }catch(Exception) {}}returnimg; }

privatevoidselectIconBtn_Click( objectsender, EventArgs e ) {OpenFileDialog openFileDlg = newOpenFileDialog; openFileDlg.Title = "Select icon"; openFileDlg.Multiselect = false; openFileDlg.CheckFileExists = true; if(openFileDlg.ShowDialog == System.Windows.Forms.DialogResult.OK) {iconPath.Text = openFileDlg.FileName;if(iconSize.Value == 0) {iconSize.Value = 15; }}else{iconPath.Text = ""; }}

privatevoidbtn_save_Click( objectsender, EventArgs e ) {

// Displays a SaveFileDialog so the user can save the ImageSaveFileDialog saveFileDialog1 = newSaveFileDialog; saveFileDialog1.Filter = "Bitmap Image|*.bmp|PNG Image|*.png|JPeg Image|*.jpg|Gif Image|*.gif"; saveFileDialog1.Title = "Save an Image File"; saveFileDialog1.ShowDialog;

// If the file name is not an empty string open it for saving.if(saveFileDialog1.FileName != "") {// Saves the Image via a FileStream created by the OpenFile method.using(FileStream fs = (System.IO.FileStream) saveFileDialog1.OpenFile) {// Saves the Image in the appropriate ImageFormat based upon the// File type selected in the dialog box.// NOTE that the FilterIndex property is one-based.

ImageFormat imageFormat = null; switch(saveFileDialog1.FilterIndex) {case1: imageFormat = ImageFormat.Bmp;break; case2: imageFormat = ImageFormat.Png;break; case3: imageFormat = ImageFormat.Jpeg;break; case4: imageFormat = ImageFormat.Gif;break; default: thrownewNotSupportedException( "File extension is not supported"); }

pictureBoxQRCode.BackgroundImage.Save(fs, imageFormat);fs.Close;}}

}

publicvoidExportToBmp( stringpath ) {

}

privatevoidtextBoxQRCode_TextChanged( objectsender, EventArgs e ) {RenderQrCode;}

privatevoidcomboBoxECC_SelectedIndexChanged( objectsender, EventArgs e ) {RenderQrCode;}}}