asp.net mvc 生成条形码

 using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;

 namespace JXUtil
 {
     public class BarCode
     {
         private Hashtable _Code39 = new Hashtable();

         /// <summary>
         /// 内容
         /// </summary>
         public string Text { get; set; }

         /// <summary>
         /// 放大倍数
         /// </summary>
         public byte Magnify { get; set; }

         /// <summary>
         /// 图形高
         /// </summary>
         public int Height { get; set; }

         /// <summary>
         /// 字体大小
         /// </summary>
         public Font ViewFont { get; set; }

         public BarCode()
         {
             _Code39.Add("A", "");
             _Code39.Add("B", "");
             _Code39.Add("C", "");
             _Code39.Add("D", "");
             _Code39.Add("E", "");
             _Code39.Add("F", "");
             _Code39.Add("G", "");
             _Code39.Add("H", "");
             _Code39.Add("I", "");
             _Code39.Add("J", "");
             _Code39.Add("K", "");
             _Code39.Add("L", "");
             _Code39.Add("M", "");
             _Code39.Add("N", "");
             _Code39.Add("O", "");
             _Code39.Add("P", "");
             _Code39.Add("Q", "");
             _Code39.Add("R", "");
             _Code39.Add("S", "");
             _Code39.Add("T", "");
             _Code39.Add("U", "");
             _Code39.Add("V", "");
             _Code39.Add("W", "");
             _Code39.Add("X", "");
             _Code39.Add("Y", "");
             _Code39.Add("Z", "");
             _Code39.Add("", "");
             _Code39.Add("", "");
             _Code39.Add("", "");
             _Code39.Add("", "");
             _Code39.Add("", "");
             _Code39.Add("", "");
             _Code39.Add("", "");
             _Code39.Add("", "");
             _Code39.Add("", "");
             _Code39.Add("", "");
             _Code39.Add("+", "");
             _Code39.Add("-", "");
             _Code39.Add("*", "");
             _Code39.Add("/", "");
             _Code39.Add("%", "");
             _Code39.Add("&", "");
             _Code39.Add(".", "");
             _Code39.Add(" ", "");
         }

         public enum Code39Model
         {
             /// <summary>
             /// 基本类别 1234567890ABC
             /// </summary>
             Code39Normal,
             /// <summary>
             /// 全ASCII方式 +A+B 来表示小写
             /// </summary>
             Code39FullAscII
         }

         /// <summary>
         /// 获得条码图形
         /// </summary>
         /// <param name="text">文字信息</param>
         /// <param name="model">类别</param>
         /// <param name="stat">是否增加前后*号</param>
         /// <returns>图形</returns>
         public Bitmap GetCodeImage(Code39Model model, bool star)
         {
             string textVal = "";
             string textCode = "";
             char[] charVal = null;
             switch (model)
             {
                 case Code39Model.Code39Normal:
                     textVal = Text.ToUpper();
                     break;
                 default:
                     charVal = Text.ToCharArray();
                     for (int i = ; i != charVal.Length; i++)
                     {
                         if ((int)charVal[i] >=  && (int)charVal[i] <= )
                         {
                             textVal += "+" + charVal[i].ToString().ToUpper();

                         }
                         else
                         {
                             textVal += charVal[i].ToString();
                         }
                     }
                     break;
             }
             charVal = textVal.ToCharArray();
             if (star == true) textCode += _Code39["*"];
             for (int i = ; i != charVal.Length; i++)
             {
                 if (star == true && charVal[i] == '*') throw new Exception("带有起始符号不能出现*");
                 object _CharCode = _Code39[charVal[i].ToString()];
                 if (_CharCode == null) throw new Exception("不可用的字符" + charVal[i].ToString());
                 textCode += _CharCode.ToString();
             }
             if (star == true) textCode += _Code39["*"];
             Bitmap bmp = GetImage(textCode);
             GetViewImage(bmp, Text);
             return bmp;
         }

         /// <summary>
         /// 绘制编码图形
         /// </summary>
         /// <param name="text">编码</param>
         /// <returns>图形</returns>
         private Bitmap GetImage(string text)
         {
             char[] val = text.ToCharArray();

             //宽 == 需要绘制的数量*放大倍数 + 两个字的宽
             Bitmap codeImg = new Bitmap(val.Length * ((int)Magnify + ), (int)Height);
             Graphics graph = Graphics.FromImage(codeImg);

             graph.FillRectangle(Brushes.White, new Rectangle(, , codeImg.Width, codeImg.Height));

             int len = ;
             for (int i = ; i != val.Length; i++)
             {
                 int width = Magnify + ;
                 if (val[i] == '')
                 {
                     graph.FillRectangle(Brushes.Black, new Rectangle(len, , width, Height));

                 }
                 else
                 {
                     graph.FillRectangle(Brushes.White, new Rectangle(len, , width, Height));
                 }
                 len += width;
             }

             graph.Dispose();
             return codeImg;
         }

         /// <summary>
         /// 绘制文字
         /// </summary>
         /// <param name="codeImage">图形</param>
         /// <param name="text">文字</param>
         private void GetViewImage(Bitmap codeImage, string text)
         {
             if (ViewFont == null) return;
             Graphics graphic = Graphics.FromImage(codeImage);
             SizeF fontSize = graphic.MeasureString(text, ViewFont);

             if (fontSize.Width > codeImage.Width || fontSize.Height > codeImage.Height - )
             {
                 graphic.Dispose();
                 return;
             }
             int starHeight = codeImage.Height - (int)fontSize.Height;
             graphic.FillRectangle(Brushes.White, new Rectangle(, starHeight, codeImage.Width, (int)fontSize.Height));

             int _StarWidth = (codeImage.Width - (int)fontSize.Width) / ;
             graphic.DrawString(text, ViewFont, Brushes.Black, _StarWidth, starHeight);
             graphic.Dispose();

         }
     }

     public class BarCode128
     {
         //  ASCII从32到127对应的条码区,由3个条、3个空、共11个单元构成,符号内含校验码
         private string[] Code128Encoding = new string[] {
 "", "", "", "", "", "", "", "", "", "",
 "", "", "", "", "", "", "", "", "", "",
 "", "", "", "", "", "", "", "", "", "",
 "", "", "", "", "", "", "", "", "", "",
 "", "", "", "", "", "", "", "", "", "",
 "", "", "", "", "", "", "", "", "", "",
 "", "", "", "", "", "", "", "", "", "",
 "", "", "", "", "", "", "", "", "", "",
 "", "", "", "", "", "", "", "", "", "",
 "", "", "", "", "", "", "", "", "", "",
 "", "", "", "", "", ""
 };
         private const string Code128Stop = "", Code128End = ""; //固定码尾
         private enum Code128ChangeModes { CodeA = , CodeB = , CodeC =  }; //变更
         private enum Code128StartModes { CodeUnset = , CodeA = , CodeB = , CodeC =  };//各类编码的码头

         /// <summary>
         /// 绘制Code128码(以像素为单位)
         /// </summary>
         public int EncodeBarcode(string code, System.Drawing.Graphics g, int x, int y, int width, int height, bool showText)
         {
             if (string.IsNullOrEmpty(code)) new Exception("条码不能为空");
             List<int> encoded = CodetoEncoded(code); //1.拆分转义
             encoded.Add(CheckDigitCode128(encoded)); //2.加入校验码
             string encodestring = EncodeString(encoded); //3.编码

             if (showText) //计算文本的大小,字体占图像的1/4高
             {
                 Font font = new System.Drawing.Font("宋体", height / 4F, System.Drawing.FontStyle.Regular, GraphicsUnit.Pixel, ((byte)()));
                 SizeF size = g.MeasureString(code, font);
                 height = height - (int)size.Height;

                 int _StarWidth = (width - (int)size.Width) / ;
                 g.DrawString(code, font, System.Drawing.Brushes.Black, _StarWidth, height);
                 int w = DrawBarCode(g, encodestring, x, y, width, height); //4.绘制
                 return ((int)size.Width > w ? (int)size.Width : w);
             }
             else
                 return DrawBarCode(g, encodestring, x, y, width, height); //4.绘制
         }

         //1.检测并将字符串拆分并加入码头
         private List<int> CodetoEncoded(string code)
         {
             List<int> encoded = new List<int>();
             int type = ;//2:B类,3:C类
             for (int i = ; code.Length > ; i++)
             {
                 int k = isNumber(code);
                 if (k >= ) //连续偶个数字可优先使用C类(其实并不定要转C类，但能用C类时条码会更短)
                 {
                     if (type == ) encoded.Add((int)Code128StartModes.CodeC); //加入码头
                     else if (type != ) encoded.Add((int)(Code128ChangeModes.CodeC)); //转义
                     type = ;
                     for (int j = ; j < k; j = j + ) //两位数字合为一个码身
                     {
                         encoded.Add(Int32.Parse(code.Substring(, )));
                         code = code.Substring();
                     }
                 }
                 else
                 {
                     if ((int)code[] <  || (int)code[] > ) throw new Exception("字符串必须是数字或字母");
                     if (type == ) encoded.Add((int)Code128StartModes.CodeB); //加入码头
                     else if (type != ) encoded.Add((int)(Code128ChangeModes.CodeB)); //转义
                     type = ;
                     encoded.Add((int)code[] - );//字符串转为ASCII-32
                     code = code.Substring();
                 }
             }
             return encoded;
         }
         //2.校验码
         private int CheckDigitCode128(List<int> encoded)
         {
             int check = encoded[];
             for (int i = ; i < encoded.Count; i++)
                 check = check + (encoded[i] * i);
             return (check % );
         }

         //2.编码(对应Code128Encoding数组)
         private string EncodeString(List<int> encoded)
         {
             string encodedString = "";
             for (int i = ; i < encoded.Count; i++)
             {
                 encodedString += Code128Encoding[encoded[i]];
             }
             encodedString += Code128Stop + Code128End; // 加入结束码
             return encodedString;
         }

         //4.绘制条码(返回实际图像宽度)
         private int DrawBarCode(System.Drawing.Graphics g, string encodeString, int x, int y, int width, int height)
         {
             int w = width / encodeString.Length;
             for (int i = ; i < encodeString.Length; i++)
             {
                 g.FillRectangle(encodeString[i] == '' ? System.Drawing.Brushes.White : System.Drawing.Brushes.Black, x, y, w, height);
                 x += w;
             }
             return w * (encodeString.Length + );
         }
         //检测是否连续偶个数字,返回连续数字的长度
         private int isNumber(string code)
         {
             int k = ;
             for (int i = ; i < code.Length; i++)
             {
                 if (char.IsNumber(code[i]))
                     k++;
                 else
                     break;
             }
             if (k %  != ) k--;
             return k;
         }

         /// <summary>
         /// 绘制Code128码到图片
         /// </summary>
         public Image EncodeBarcode(string code, int width, int height, bool showText)
         {
             Bitmap image = new Bitmap(width, height);
             using (Graphics g = Graphics.FromImage(image))
             {
                 g.Clear(Color.White);
                 int w = EncodeBarcode(code, g, , , width, height, showText);

                 Bitmap image2 = new Bitmap(w, height); //剪切多余的空白;
                 using (Graphics g2 = Graphics.FromImage(image2))
                 {
                     g2.DrawImage(image, , );
                     return image2;
                 }

             }

         }

         /// <summary>
         /// 绘制Code128码到流
         /// </summary>
         public byte[] EncodeBarcodeByte(string code, int width, int height, bool showText)
         {
             Image image = EncodeBarcode(code, width, height, showText);
             System.IO.MemoryStream ms = new System.IO.MemoryStream();
             image.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
             byte[] byteImage = ms.ToArray();
             ms.Close();
             image.Dispose();
             return byteImage;

         }
     }
 }

 <div>
         <table>
             <tr>
                 <td>条码：</td>
                 <td>
                     <textarea id="barCode"></textarea><br />
                     <span style="color: #ccc;">动态生成条码，生成多条码使用“,”号分隔。</span>
                 </td>
             </tr>
             <tr>
                 <td></td>
                 <td>
                     <a id="btnCreate">生成</a>
                 </td>
             </tr>
         </table>
 </div>

 $("#btnCreate").click(function () {
             var barCode = $("#barCode").val();
             if (barCode != "" && barCode != null) {
                 $("#print").html("");
                 var imgStr = "";
                 if (barCode.indexOf(",") > -1) {
                     var code = barCode.split(",");
                     $.each(code, function (index, value) {
                         if (value != "" && value != null) {
                             imgStr += "<div><img src='/BaseData/CreateBarCode?code=" + value + "'/></div>";
                         }
                     });
                 }
                 else {
                     imgStr = "<div><img src='/BaseData/CreateBarCode?code=" + barCode + "'/></div>";
                 }

                 $("#print").append(imgStr);
             }
             else {
                 alert("条码不能为空！");
             }
         });

 public ActionResult CreateBarCode(string code)
         {
             JXUtil.BarCode barcode = new JXUtil.BarCode();
             barcode.Text = code;
             barcode.Height = ;
             barcode.Magnify = ;
             barcode.ViewFont = new Font("宋体", );
             System.Drawing.Image codeImage = barcode.GetCodeImage(JXUtil.BarCode.Code39Model.Code39Normal, true);

             System.IO.MemoryStream ms = new System.IO.MemoryStream();
             codeImage.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

             Response.ContentType = "image/jpeg";
             Response.Clear();
             Response.BinaryWrite(ms.ToArray());

             return new EmptyResult();
         }