rdlc报表显示条码 .

1.条码的生成：

private Bitmap GetCode39(string strSource)
        {
            int x = 5; //左邊界     
            int y = 0; //上邊界     
            int WidLength = 2; //粗BarCode長度     
            int NarrowLength = 1; //細BarCode長度     
            int BarCodeHeight = 24; //BarCode高度     
            int intSourceLength = strSource.Length;
            string strEncode = "010010100"; //編碼字串 初值為 起始符號 *      
            string AlphaBet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%*"; //Code39的字母     
            string[] Code39 = //Code39的各字母對應碼
                {     
                    /**//* 0 */ "000110100",      
                    /**//* 1 */ "100100001",     
                    /**//* 2 */ "001100001",      
                    /**//* 3 */ "101100000",     
                    /**//* 4 */ "000110001",      
                    /**//* 5 */ "100110000",      
                    /**//* 6 */ "001110000",      
                    /**//* 7 */ "000100101",     
                    /**//* 8 */ "100100100",      
                    /**//* 9 */ "001100100",      
                    /**//* A */ "100001001",      
                    /**//* B */ "001001001",     
                    /**//* C */ "101001000",      
                    /**//* D */ "000011001",      
                    /**//* E */ "100011000",      
                    /**//* F */ "001011000",     
                    /**//* G */ "000001101",      
                    /**//* H */ "100001100",      
                    /**//* I */ "001001100",      
                    /**//* J */ "000011100",     
                    /**//* K */ "100000011",      
                    /**//* L */ "001000011",      
                    /**//* M */ "101000010",      
                    /**//* N */ "000010011",     
                    /**//* O */ "100010010",      
                    /**//* P */ "001010010",      
                    /**//* Q */ "000000111",      
                    /**//* R */ "100000110",     
                    /**//* S */ "001000110",      
                    /**//* T */ "000010110",      
                    /**//* U */ "110000001",      
                    /**//* V */ "011000001",     
                    /**//* W */ "111000000",      
                    /**//* X */ "010010001",      
                    /**//* Y */ "110010000",      
                    /**//* Z */ "011010000",     
                    /**//* - */ "010000101",      
                    /**//* . */ "110000100",      
                    /**//*' '*/ "011000100",     
                    /**//* $ */ "010101000",     
                    /**//* / */ "010100010",      
                    /**//* + */ "010001010",      
                    /**//* % */ "000101010",      
                    /**//* * */ "010010100" 
                };
            strSource = strSource.ToUpper();
            //實作圖片     
            Bitmap objBitmap = new Bitmap(((WidLength * 3 + NarrowLength * 7) * (intSourceLength + 2)) + (x * 2), BarCodeHeight + (y * 2));
            Graphics objGraphics = Graphics.FromImage(objBitmap);
            //宣告GDI+繪圖介面     
            //填上底色     
            objGraphics.FillRectangle(Brushes.White, 0, 0, objBitmap.Width, objBitmap.Height);
            for (int i = 0; i < intSourceLength; i++)
            {
                //檢查是否有非法字元         
                if (AlphaBet.IndexOf(strSource[i]) == -1 || strSource[i] == '*')
                {
                    objGraphics.DrawString("含有非法字元", SystemFonts.DefaultFont, Brushes.Red, x, y);
                    return objBitmap;
                }
                //查表編碼         
                strEncode = string.Format("{0}0{1}", strEncode, Code39[AlphaBet.IndexOf(strSource[i])]);
            }
            strEncode = string.Format("{0}0010010100", strEncode);
            //補上結束符號 *      
            int intEncodeLength = strEncode.Length;
            //編碼後長度     
            int intBarWidth;
            for (int i = 0; i < intEncodeLength; i++)
            //依碼畫出Code39 BarCode     
            {
                intBarWidth = strEncode[i] == '1' ? WidLength : NarrowLength;
                objGraphics.FillRectangle(i % 2 == 0 ? Brushes.Black : Brushes.White, x, y, intBarWidth, BarCodeHeight); x += intBarWidth;
            }
            return objBitmap;
        }

2.生成条码图片

MemoryStream oStream2 = new MemoryStream();
                        try
                        {
                            Bitmap oBmp2 = GetCode39(goodsNum);
                            oBmp2.Save(oStream2, System.Drawing.Imaging.ImageFormat.Png);
                            //图片路径
                            oBmp2.Save(url + goodsName + ".png",   System.Drawing.Imaging.ImageFormat.Png);
                            oBmp2.Dispose();
                        }
                        finally
                        {
                            oStream2.Dispose();
                        }

3.读取条码图片转化为二进制流

                        FileStream file = new FileStream(url + freightBill + ".png", FileMode.Open, FileAccess.Read);
                        Byte[] bytGoodsCode = new Byte[file.Length];
                        file.Read(bytGoodsCode, 0, bytGoodsCode.Length);
                        file.Close();

4.将条码图片保存进数据库

5.将条码图片在报表上显示出来：

  在报表上拖放一个image图像控件,Source设置为DataBase（External为嵌入图片，Embedded为外部图片），Value 选择条码字段,设置MIMEType属性。

这样就能看见报表上面的图片了。

注：本来数据库存放条码图片的URL，但是在报表上用Embedded显示图片的时候，给image控件绑定了条码图片的URL值，但是运行图片显示不出，image控件的SRC="";还没有找到问题。