PrintDocument or PrintPreviewDialog 打印

  /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnPreview_Click(object sender, EventArgs e)
        {
　　　　　　　PackTypeReport report = null;
            _printTable = GetPrintTable();
            report.PrintData = _printTable;
            report.Preview();
        }

        /// <summary>
        /// 打印
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnPrint_Click(object sender, EventArgs e)
        {
            PackTypeReport report = null;
            _printTable = GetPrintTable();
            report.PrintData = _printTable;
            report.Print();
        }

 /// <summary>
    /// 电子条码打印
    /// </summary>
    public class PackTypeReport
    {

        /// <summary>
        /// 打印文档
        /// </summary>
        PrintDocument _printDoc;
        /// <summary>
        /// 打印预览窗体
        /// </summary>
        PrintPreviewDialog _printPreview;

        /// <summary>
        /// A4纸宽度
        /// </summary>
        const float PageWidth = 840f;//210mm
        /// <summary>
        /// A4纸高度
        /// </summary>
        const float PageHeight = 1188f;//297mm

        const float PaddingVertical = 20f;//上下边距
        const float PaddingHorizontal = 40f;//左右边距
        const float BarCodeHeight = 50;//条码高度
        const float ItemPadding = 5;//项目内部项上下间隔
        private float BarCodeTop = PaddingVertical;
        private float _barcodeLeft = PaddingHorizontal;
        private float _barcodeWidth = 200;//每个条码的间隔量
        private float _ItemHeight = 40;//每个项目间的上下间隔
        private float CodeNameTHeight = 0f;//条码(包括下边距)和包名总高度，窗体加载中设置
        private int PageIndex = 1;//打印当前页
        private string Title = "器械包编码";//打印显示的标题;
        private DataRow[] printRowsForC = null;//字母检索数据行集合
        private Font TitleFont = new Font("Arital", 16f, FontStyle.Bold);//标题字体
        private Font CodeFont = new Font("Arital", 10f);//条码字体
        private Font NameFont = new Font("Arital", 12f);//包名字体
        private char letter = '1';//非字母标实
        private int rowIndex = 0;//行索引
        private List<DataRow> printRowsForD = null;//非字母检索数据行集合

        private DataTable _printTable = null;
        /// <summary>
        /// 打印数据
        /// </summary>
        public DataTable PrintData
        {
            set
            {
                _printTable = value;
            }
        }
        /// <summary>
        /// 
        /// </summary>
        public PackTypeReport(PrintDocument pd, PrintPreviewDialog prd)
        {
            _printDoc = pd;
            _printPreview = prd;
            CodeNameTHeight = GetCodeAndNameHeight();

            _printPreview.Width = 794;
            _printPreview.Height = 506;
            _printDoc.DefaultPageSettings.Margins = new System.Drawing.Printing.Margins(20, 20, 25, 25);
            _printDoc.DefaultPageSettings.PaperSize = new System.Drawing.Printing.PaperSize("A4", (int)PageWidth, (int)PageHeight);
            _printDoc.PrintPage += new PrintPageEventHandler(DrawPage);
        }

        /// <summary>
        /// 打印
        /// </summary>
        public void Print()
        {
            _printDoc.Print();
        }

        /// <summary>
        /// 预览
        /// </summary>
        public void Preview()
        {
            _printPreview.ShowDialog();
        }

        //条码(包括下边距)和包名总高度
        private float GetCodeAndNameHeight()
        {
            return TitleFont.GetHeight() + ItemPadding + BarCodeHeight;
        }

        /// <summary>
        /// 开始绘制
        /// </summary>
        private void DrawPage(object sender,System.Drawing.Printing.PrintPageEventArgs e)
        {
            //定位到页头
            BarCodeTop = PaddingVertical;
            //临时的下一个定位点，用于绘制包名条码 
            float LSTop = 0f;
            //第一页需要绘制标题
            if (PageIndex == 1)
            {
                DrawTitle(e.Graphics, Title, ref BarCodeTop);
            }
            float y = 0;
            while (BarCodeTop < PageHeight - PaddingVertical)
            {
                if (letter == '1')
                {
                    //检索非字母优化设置
                    if (printRowsForD == null)
                    {
                        printRowsForD = new List<DataRow>();
                        foreach (DataRow dr in _printTable.Select("", "name asc"))
                        {
                            if (dr["Spell"].ToString() == "" || !char.IsLetter(dr["Spell"].ToString()[0]))
                            {
                                printRowsForD.Add(dr);
                            }
                        }
                        //0个非字母数据时，将转入字母A开始的数据，并初始化行索引rowIndex
                        if (printRowsForD.Count == 0)
                        {
                            letter = 'A';
                            rowIndex = 0;
                        }
                    }
                    else
                    {
                        //行索引在指定行内
                        if (rowIndex < printRowsForD.Count)
                        {
                            string packName = printRowsForD[rowIndex]["Name"].ToString();
                            string barcode = printRowsForD[rowIndex]["Bar"].ToString();
                            if (rowIndex % 4 == 0)
                            {
                                //判断包名和条码组合高度是否超出指定高度
                                _barcodeLeft = PaddingHorizontal;
                                BarCodeTop += y + _ItemHeight;//加上Y偏移
                                if (BarCodeTop + CodeNameTHeight >= PageHeight - PaddingVertical)
                                {
                                    break;
                                }
                                else
                                {
                                    y = DrawCodeAndName(e.Graphics, packName, barcode,letter, _barcodeLeft, BarCodeTop);
                                    LSTop = y + BarCodeTop + 10;
                                }
                            }
                            else
                            {
                                y = DrawCodeAndName(e.Graphics, packName, barcode, '1',_barcodeLeft, BarCodeTop);
                            }
                            _barcodeLeft += _barcodeWidth;
                            rowIndex++;
                        }
                        else
                        {
                            //数据全部加载完设置
                            printRowsForD = null;
                            letter = 'A';

                            //奇偶条码终点定位设置，奇数需要跳转到下一个定位点高度
                            if ((rowIndex - 1) % 4 == 0)
                            {
                                BarCodeTop = LSTop;
                                y = 0;//Y偏移量已经加在LSTOP上
                            }

                            rowIndex = 0;
                            //类型名与条码包名的组合高度超过指定高度，需要跳转到下一页，用于分类名显示不会显示在页尾的情况
                            if (BarCodeTop + CodeNameTHeight >= PageHeight - PaddingVertical)
                            {
                                break;
                            }
                        }
                    }
                }
                else
                {
                    //字母检索优化设置
                    if (printRowsForC == null || printRowsForC.Length == 0)
                    {
                        //判断当前定位点是否能够包含类型名绘制点
                        if (BarCodeTop >= PageHeight - PaddingVertical)
                        {
                            break;
                        }
                        else
                        {
                            printRowsForC = _printTable.Select(string.Format("Spell like '{0}%'", letter), "Name asc");
                            //判断该分类数据是否存在，存在时显示其分类名
                            if (printRowsForC.Length == 0)
                            {//如果该分类不存在数据，且不是Z字母时，初始化行索引和进入下一个字母，若为Z，初始化后退出循环
                                if (letter < 'Z')
                                {
                                    rowIndex = 0;
                                    letter = (char)(letter + 1);
                                }
                                else
                                {
                                    rowIndex = 0;
                                    letter = (char)(letter + 1);
                                    printRowsForC = null;
                                    break;
                                }
                            }
                        }
                    }
                    else
                    {
                        //行索引在指定行内
                        if (rowIndex < printRowsForC.Length)
                        {
                            string packName = printRowsForC[rowIndex]["Name"].ToString();
                            string barcode = printRowsForC[rowIndex]["Bar"].ToString();
                            if (rowIndex % 4 == 0)
                            {
                                BarCodeTop += y + _ItemHeight;
                                _barcodeLeft = PaddingHorizontal;
                                //判断包名和条码组合高度是否超出指定高度
                                if (BarCodeTop + CodeNameTHeight >= PageHeight - PaddingVertical)
                                {
                                    break;
                                }
                                else
                                {
                                    y = DrawCodeAndName(e.Graphics, packName, barcode, letter, _barcodeLeft, BarCodeTop);
                                    LSTop = y + BarCodeTop + 10;
                                }

                            }
                            else
                            {
                                y = DrawCodeAndName(e.Graphics, packName, barcode, '1', _barcodeLeft, BarCodeTop);
                            }
                            _barcodeLeft += _barcodeWidth;
                            rowIndex++;
                        }
                        else
                        {
                            //加载该字母分类数据完毕时，需要判断该字母是否为字母Z。若不是，进入奇偶条码的下一个定位点判断，并初始化。若是，则设置字符为Z的下一个，并退出循环
                            if (letter >= 'Z')
                            {
                                letter = (char)(letter + 1);
                                break;
                            }
                            else if ((rowIndex - 1) % 4 == 0)
                            {
                                BarCodeTop = LSTop;
                                y = 0;
                            }
                            rowIndex = 0;
                            printRowsForC = null;
                            letter = (char)(letter + 1);
                            //类型名与条码包名的组合高度超过指定高度，需要跳转到下一页，用于分类名显示不会显示在页尾的情况
                            if (BarCodeTop + CodeNameTHeight >= PageHeight - PaddingVertical)
                            {
                                break;
                            }
                        }
                    }
                }
            }

            PageIndex++;
            //当退出循环时，使用字符判断是否为Z的下一个字符，来确定当前页是否是最后一页
            if (letter <= 'Z')
            {
                e.HasMorePages = true;
            }
            else
            {
                PageIndex = 1;
                letter = '1';
                rowIndex = 0;
                printRowsForD = null;
                printRowsForC = null;
                e.HasMorePages = false;
            }
        }

        /// <summary>
        /// 绘制标题
        /// </summary>
        private void DrawTitle(Graphics g, string strTitle, ref float y)
        {
            float width = g.MeasureString(strTitle, TitleFont).Width;
            float left = (PageWidth - width) / 2;
            g.DrawString(strTitle, TitleFont, Brushes.Black, left, PaddingHorizontal);

            y += TitleFont.GetHeight() + ItemPadding;
        }



        /// <summary>
        /// 绘制条码和包名,返回下边纵坐标
        /// </summary>
        /// <returns>float</returns>
        private float DrawCodeAndName(Graphics g, string name, string code,char letter, float x, float y)
        {
            float top = 0;
            float y1 = 0;
            string name1 = string.Empty;
            string name2 = string.Empty;

            if (name.Length > 10)
            {
                name1 = name.Substring(0, 10);
                name2 = name.Substring(10);
            }
            else
            {
                name2 = " ";
                name1 = name;
            }
            if (letter != '1')
            {
                g.DrawString(Convert.ToString(letter), NameFont, Brushes.Black, x, y);
                y1 = NameFont.GetHeight() + ItemPadding;
                top = y1;
                y += y1;
            }
            else
            {
                g.DrawString("", NameFont, Brushes.Black, x, y);
                y1 = NameFont.GetHeight() + ItemPadding;
                top = y1;
                y += y1;
            }
            g.DrawString(name1, NameFont, Brushes.Black, x, y);
            y1 = NameFont.GetHeight() + ItemPadding;
            top = y1;
            y += y1;

            g.DrawString(name2, NameFont, Brushes.Black, x, y);
            top += y1;
            y += y1;

            float y2 = 0;
            g.DrawString(code, CodeFont, Brushes.Black, x, y);
            y2 = CodeFont.GetHeight() + ItemPadding;

            top += y2;
            y += y2;
            Image codeImg = BLL.Report.Print.IReport.GetBarcodeImg(code);
            g.DrawImage(codeImg, x, y);

            top += codeImg.Height + ItemPadding;

            return top;
        }

    }