二维码生成Demo

   protected void Button1_Click(object sender, EventArgs e)
    {
        QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
        qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;//编码方式(ALPHA_NUMERIC：字母和数字,BYTE:为字节,多用于汉字，NUMERIC:数字)
        qrCodeEncoder.QRCodeScale = 4;//大小(值越大生成的二维码图片像素越高)
        qrCodeEncoder.QRCodeVersion = 7; //版本(注意：设置为0主要是防止编码的字符串太长时发生错误,7)
        qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//错误效验、错误更正(有4个等级)
        string data = "NI ";//这里是分销商路径
        String ls_fileName = "P"+DateTime.Now.ToString("yyyyMMddhhmmss") +".png";
        String ls_savePath = Server.MapPath(".") + "/QRCodeImages/" + ls_fileName;//
        //System.Text.Encoding.GetEncoding("GB2312")//如果内容是中文需要编码（utf-8，GB2312）
        qrCodeEncoder.Encode(data, System.Text.Encoding.GetEncoding("utf-8")).Save(ls_savePath);

        Image1.ImageUrl=("QRCodeImages/" + ls_fileName);
    }