有三种方式：
1、ZXing.Net
实例源码：
protected void Page_Load(object sender, EventArgs e)
{
DateTime dtBegin = DateTime.Now;
string fileName = AppDomain.CurrentDomain.BaseDirectory + "bin\" + Guid.NewGuid().ToString() + ".jpg";
string content = HttpUtility.UrlDecode(this.Request【"content"】);
BarcodeWriter writer = new BarcodeWriter()
{
Format = BarcodeFormat.QR_CODE,
Options = new EncodingOptions()
{
Width = 300,
Height = 400
},
Renderer = (IBarcodeRenderer)Activator.CreateInstance(typeof(BitmapRenderer))
};
Bitmap bmp = writer.Write(content);
bmp.Save(fileName);
this.Response.WriteFile(fileName);
string time = (DateTime.Now - dtBegin).TotalMilliseconds.ToString();
}
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2、QrCode.Net
实例源码：
protected void Page_Load(object sender, EventArgs e)
{
DateTime dtBegin = DateTime.Now;
string fileName = AppDomain.CurrentDomain.BaseDirectory + "bin\" + Guid.NewGuid().ToString() + ".jpg";
string content = HttpUtility.UrlDecode(Request.QueryString【"content"】);
QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.M);
QrCode qrCode = qrEncoder.Encode(content);
GraphicsRenderer renderer = new GraphicsRenderer(new FixedModuleSize(5, QuietZoneModules.Two), Brushes.Black, Brushes.White);
using (FileStream stream = new FileStream(fileName, FileMode.Create))
{
renderer.WriteToStream(qrCode.Matrix, ImageFormat.Png, stream);
}
this.Response.WriteFile(fileName);
string spendTime = (DateTime.Now - dtBegin).TotalMilliseconds.ToString();
}
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3、ThoughtWorks.QRCode
实例源码：
protected void Page_Load(object sender, EventArgs e)
{
DateTime dtBegin = DateTime.Now;
string //代码效果参考：http://www.lyjsj.net.cn/wz/art_22816.html
content = HttpUtility.UrlDecode(Request.QueryString【"content"】);Bitmap bitmap = CreateQRCode(content);
string fileName = AppDomain.CurrentDomain.BaseDirectory + "bin\" + Guid.NewGuid().ToString() + ".jpg";
bitmap.Save(fileName, ImageFormat.Jpeg);
Response.WriteFile(fileName,true);
string spendTime = (DateTime.Now - dtBegin).TotalMilliseconds.ToString();
//代码效果参考：http://www.lyjsj.net.cn/wx/art_22814.html
}public Bitmap CreateQRCode(string content)
{
QRCodeEncoder qrEncoder = new QRCodeEncoder();
qrEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
qrEncoder.QRCodeScale = 4; //Convert.ToInt32(txtSize.Text);
qrEncoder.QRCodeVersion = 7;// Convert.ToInt32(cboVersion.SelectedValue);
qrEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
try
{
Bitmap qrcode = qrEncoder.Encode(content, Encoding.UTF8);
return qrcode;
}
catch (IndexOutOfRangeException ex)
{
//超出当前二维码版本的容量上限，请选择更高的二维码版本
return new Bitmap(100, 100);
}
catch (Exception ex)
//代码效果参考：http://www.lyjsj.net.cn/wx/art_22812.html
{//生成二维码出错
return new Bitmap(100, 100);
}
}
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注意事项：
1、web端请求二维码的一种方式是将生成二维码的服务页面赋给的src属性。
2、三种方式均为开源项目，使用时到官网下载源码，并添加到项目中即可
3、三种方式对比：3的处理速度最快，在web端访问的处理时间大概20ms，1和2的速度达不多，为50ms到70ms左右，但1和2dll较小，几百k，而3为6M
4、方式3的demo运行时有问题，原因待查
