C# 使用ZXing.net生成一维码（带数字与不带数字）、二维码（带logo与不带logo）

nuget中搜索ZXing.Net安装

using ZXing;
using ZXing.QrCode.Internal;
using ZXing.Common;

注意：只能生成数字或者字母数据的一维码
代码如下：

		public static Bitmap 1DBarCode(string text)
        {
            BarcodeWriter writer = new BarcodeWriter();
            //ITF 格式不能被现在常用的支付宝、微信扫出来
            //想生成可识别的可以使用 CODE_128 格式
            //writer.Format = BarcodeFormat.ITF;
            writer.Format = BarcodeFormat.CODE_128;
            EncodingOptions options = new EncodingOptions()
            {
            	//控制生成的一维码大小
                Width = 150,
                Height = 50,
                Margin = 2,
                
 				//true：一维码下方不显示数字或者字母false:显示，默认是false
                PureBarcode = true  
            };
            writer.Options = options;
            Bitmap map = writer.Write(text);
            return map;
        }

代码如下：

  		/// 

        /// 生成二维码图片
        /// 
        /// 要生成二维码的字符串
        /// 二维码图片宽度
        /// 二维码图片高度
        /// 
        private Bitmap 2DBarCode(String str, Int32 width, Int32 height)
        {
            Bitmap result = null;
            try
            {
                BarcodeWriter barCodeWriter = new BarcodeWriter();
                barCodeWriter.Format = BarcodeFormat.QR_CODE;
                barCodeWriter.Options.Hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
                barCodeWriter.Options.Hints.Add(EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.H);
                barCodeWriter.Options.Height = height;
                barCodeWriter.Options.Width = width;
                barCodeWriter.Options.Margin = 0;
                ZXing.Common.BitMatrix bm = barCodeWriter.Encode(strMessage);
                result = barCodeWriter.Write(bm);
            }
            catch (Exception ex)
            {
                //异常输出
            }
            return result;
        }

 /// 

        /// 生成带Logo的二维码
        /// 
        /// 要生成二维码的字符串
        /// 二维码中的logo图像
        /// 
        static Bitmap 3DBarCodeWithLogo(string text, Bitmap logo)
        {
            Bitmap bitmap = null;
            //Logo 图片
            //Bitmap logo = new Bitmap(logo);
            //构造二维码写码器
            MultiFormatWriter writer = new MultiFormatWriter();
            Dictionary hint = new Dictionary();
            hint.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
            hint.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

            //生成二维码 
            BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, 300, 300, hint);
            BarcodeWriter barcodeWriter = new BarcodeWriter();
            Bitmap map = barcodeWriter.Write(bm);


            //获取二维码实际尺寸（去掉二维码两边空白后的实际尺寸）
            int[] rectangle = bm.getEnclosingRectangle();

            //计算插入图片的大小和位置
            int middleW = Math.Min((int)(rectangle[2] / 3.5), logo.Width);
            int middleH = Math.Min((int)(rectangle[3] / 3.5), logo.Height);
            int middleL = (map.Width - middleW) / 2;
            int middleT = (map.Height - middleH) / 2;

            //将img转换成bmp格式，否则后面无法创建Graphics对象
            Bitmap bmpimg = new Bitmap(map.Width, map.Height, PixelFormat.Format32bppArgb);
            using (Graphics g = Graphics.FromImage(bmpimg))
            {
                g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
                g.DrawImage(map, 0, 0);
            }
            //将二维码插入图片
            Graphics myGraphic = Graphics.FromImage(bmpimg);
            //白底
            myGraphic.FillRectangle(Brushes.White, middleL, middleT, middleW, middleH);
            myGraphic.DrawImage(logo, middleL, middleT, middleW, middleH);

            bitmap = bmpimg;

            return bitmap;
        }

代码如下

  		/// 

        /// 解码二维码
        /// 
        /// 待解码的一/二维码图片
        /// 扫码结果
        private string DecodeQrCode(Bitmap barcodeBitmap)
        {
            BarcodeReader reader = new BarcodeReader();
            reader.Options.CharacterSet = "UTF-8";
            var result = reader.Decode(barcodeBitmap);
            return (result == null) ? null : result.Text;
        }

载入代码：

			string filePath = "";
            //选择文件
            OpenFileDialog dialog = new OpenFileDialog();
            dialog.Multiselect = true;//该值确定是否可以选择多个文件
            dialog.Title = "请选择图片";
            dialog.Filter = "(*.jpg,*.png,*.jpeg,*.bmp,*.gif)|*.jpg;*.png;*.jpeg;*.bmp;*.gif|All files(*.*)|*.*";
            if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                filePath = dialog.FileName;
                if (File.Exists(filePath))
                {
                    byte[] data = File.ReadAllBytes(filePath);

                    using (MemoryStream ms = new MemoryStream(data))
                    {                       
                        pictureBox1.Image = new Bitmap(Image.FromStream(ms));
                    }

                }
            }

保存代码

 			SaveFileDialog dialog = new SaveFileDialog();
            dialog.Title = "保存图片";
            dialog.Filter = "(*.jpg,*.png,*.jpeg,*.bmp,*.gif)|*.jpg|*.png|*.jpeg|*.bmp|*.gif|All files(*.*)|*.*";
            dialog.FilterIndex = 1;
            dialog.RestoreDirectory = true;

            if (dialog.ShowDialog() == DialogResult.OK)
            {
                pictureBox1.Image.Save(dialog.FileName);
            }
            else
            {
                //MessageBox.Show("取消保存");
                return;
            }

图片转base64代码：

		 public string ImgToBase64String(Image bmp)
        {
            try
            {
                MemoryStream ms = new MemoryStream();
                bmp.Save(ms, ImageFormat.Jpeg);
                byte[] arr = new byte[ms.Length];
                ms.Position = 0;
                ms.Read(arr, 0, (int)ms.Length);
                ms.Close();
                return Convert.ToBase64String(arr);
            }
            catch (Exception ex)
            {
                return null;
            }
        }

Base64转图片代码：

		public Bitmap Base64StringToImage(string strbase64)
        {
            try
            {
                byte[] arr = Convert.FromBase64String(strbase64);
                MemoryStream ms = new MemoryStream(arr);
                Bitmap img = (Bitmap)Image.FromStream(ms);
                return img;
            }
            catch (Exception ex)
            {
                return null;
            }
        }