网页WEB打印控件制作-开放源码

 在WEB系统中，打印的确是比较烦人的问题，如果我们能制作一个属于自己的自定义的打印插件，那么我们在后续自定义打印的时候能随心所欲的控制打印，这样的效果对于程序员来说是非常开心的一件事件，本文将自己开发编写的C# 制作的HTML打印插件分享出来，让有同样需求的朋友提供一个参考；此插件是基于Microsoft .NET Framework 2.0 开发的，缺点是每台客户端在安装插件时，必须要安装Microsoft .NET Framework 2.0 ；本插件能实现 页眉、页脚、表头、标题、表尾的分页打印；支持纸张类型、自动补充空行等功能；由于技术有限，肯定有很多不足的地方，请批评指正！

由于本打印插件是基于我们开发平台的报表基础来开发设计的，所以打印控件的原理：通过JS将页面表格数据生成固定格式的XML字符串（图片通过64base图片格式）传送给打印插件，有打印插件自主绘图生成打印页面。E_Print插件可以在WEB或WinForm中使用：

打印插件完整源码：E_Print.rar （包含插件源码、打包程序、winform调试DEMO）

下面贴出源码：（在源码中有详细的注释说明）

 using System; using System.Collections.Generic; using System.Text; using System.Drawing; namespace E_Print {     /// <summary>     /// 分页计算     /// </summary>     public class PagingCalc     {         #region 私有变量         /// <summary>         /// 表格区域         /// </summary>         private RectangleF _tableRect;         /// <summary>         /// 报表行集         /// </summary>         private List<Row> _rowsList;         /// <summary>         /// 是否每页打印标题         /// </summary>         private bool _isAllPrintTitle;         /// <summary>         /// 是否每页打印表头         /// </summary>         private bool _isAllPrintHead;         /// <summary>         /// 是否每页打印表尾         /// </summary>         private bool _isAllPrintFoot;         /// <summary>         /// 标题行集         /// </summary>         private List<Row> TitleList;         /// <summary>         /// 表头前行集         /// </summary>         private List<Row> HForeList;         /// <summary>         /// 表头行集         /// </summary>         private List<Row> HeadList;         /// <summary>         /// 数据行集         /// </summary>         private List<Row> DataList;         /// <summary>         /// 表尾行集         /// </summary>         private List<Row> FootList;         /// <summary>         /// 每页打印标题+表头高度         /// </summary>         private float _myHeadPix;         /// <summary>         /// 每页打印表尾高度         /// </summary>         private float _myFootPix;         #endregion         #region 构造方法         /// <summary>         /// 构造函数         /// </summary>         public PagingCalc()         {             _tableRect = new RectangleF();             _rowsList = new List<Row>();             _isAllPrintTitle = false;             _isAllPrintHead = false;             _isAllPrintFoot = false;             TitleList = new List<Row>();             HForeList = new List<Row>();             HeadList = new List<Row>();             DataList = new List<Row>();             FootList = new List<Row>();             _myHeadPix = 0;             _myFootPix = 0;         }         #endregion         #region 属性方法         /// <summary>         /// 获取--设置--表格区域         /// </summary>         public RectangleF TableRect         {             get { return _tableRect; }             set { _tableRect = value; }         }         /// <summary>         /// 获取--设置--表格行集         /// </summary>         public List<Row> RowsList         {             get { return _rowsList; }             set { _rowsList = value; }         }         /// <summary>         /// 获取--设置--是否每页打印标题         /// </summary>         public bool IsAllPrintTitle         {             get { return _isAllPrintTitle; }             set { _isAllPrintTitle = value; }         }         /// <summary>         /// 获取--设置--是否每页打印表头         /// </summary>         public bool IsAllPrintHead         {             get { return _isAllPrintHead; }             set { _isAllPrintHead = value; }         }         /// <summary>         /// 获取--设置--是否每页打印表尾         /// </summary>         public bool IsAllPrintFoot         {             get { return _isAllPrintFoot; }             set { _isAllPrintFoot = value; }         }         /// <summary>         /// 获取--设置--每页打印标题+表头高度         /// </summary>         public float MyHeadPix         {             get { return _myHeadPix; }             set { _myHeadPix = value; }         }         /// <summary>         /// 获取--设置--每页打印表尾巴高度         /// </summary>         public float MyFootPix         {             get { return _myFootPix; }             set { _myFootPix = value; }         }         #endregion         #region 计算方法         /// <summary>         /// 分页计算         /// </summary>         /// <returns></returns>         public List<PagingItem> CalcPages()         {             List<PagingItem> retPages = new List<PagingItem>();             // 无需分页             if (Get_TableAllHeight() <= TableRect.Height)             {                 PagingItem tmItem0 = new PagingItem();                 tmItem0.PageNum = 1;                 for (int y = 0; y < RowsList.Count; y++)                 {                     tmItem0.IndexList.Add(y);                 }                 retPages.Add(tmItem0);             }             else  // 需要分页             {                 // 有设置了 每页打印标题、表头、表位 其中的任意一个                 if (Get_IsCusSet_THDF())  // 则执行每页相对分页                 {                     Paging_Relative(0, ref retPages);                     // 计算每页打印头尾高度                     MyHeadPix = 0;                     if (IsAllPrintTitle)                     {                         MyHeadPix += Get_TableTileHeight();                     }                     if (IsAllPrintHead)                     {                         MyHeadPix += Get_TableHeadHeight();                     }                     if (IsAllPrintFoot)                     {                         MyFootPix = Get_TableFootHeight();                     }                 }                 else  // 执行直接数据分页                 {                     Paging_Direct(0, ref retPages);                 }             }             return retPages;         }         /// <summary>         /// 直接分页         /// </summary>         /// <param name="startR">开始行号</param>         /// <param name="pages">页面数组</param>         private void Paging_Direct(int startR, ref  List<PagingItem> pages)         {             float p_Height = TableRect.Height;             PagingItem p_Item = new PagingItem();             p_Item.PageNum = pages.Count + 1;             for (int t = startR; t < RowsList.Count; t++)             {                 // 检查行内单元格是否不允许分页两种情况：条形码,图片                 if (Paging_CheckCell(RowsList[t], p_Height))                 {                     startR = t;                     pages.Add(p_Item);                     Paging_Direct(startR, ref pages);                     break;                 }                 else                 {                     p_Height -= RowsList[t].RowHeight;                     if (p_Height <= 0)                     {                         startR = t;                         pages.Add(p_Item);                         Paging_Direct(startR, ref pages);                         break;                     }                     else                     {                         p_Item.IndexList.Add(t);                         if (t == RowsList.Count - 1)                         {                             pages.Add(p_Item);                         }                     }                 }             }         }         /// <summary>         /// 相对分页         /// </summary>         /// <param name="startR">开始序号</param>         /// <param name="pages">页面数组</param>         private void Paging_Relative(int startR, ref  List<PagingItem> pages)         {             SplitReportArea();                     // 拆分表行             float p_Height = TableRect.Height;     // 页面总高             PagingItem p_Item = new PagingItem();  // 分页页面             p_Item.PageNum = pages.Count + 1;      // 分页页码             bool runNext = false;                  // 继续分页             #region 每页打印标题             // 每页打印标题             if (IsAllPrintTitle)             {                 p_Height -= Get_TableTileHeight();                 foreach (Row p_Row in TitleList)                     p_Item.IndexList.Add(p_Row.RowIndex);             }             else             {                 if (p_Item.PageNum == 1)  // 第一页特殊处理                 {                     p_Height -= Get_TableTileHeight();                     foreach (Row p_Row in TitleList)                         p_Item.IndexList.Add(p_Row.RowIndex);                 }             }             #endregion             #region 每页打印表头             // 每页打印表头             if (IsAllPrintHead)             {                 if (p_Item.PageNum == 1)  // 第一页特殊处理                 {                     // 计算表头前的行高                     p_Height -= Get_TableHForHeight();                     foreach (Row p_Row in HForeList)                         p_Item.IndexList.Add(p_Row.RowIndex);                 }                 // 计算表头行的高度                 p_Height -= Get_TableHeadHeight();                 foreach (Row p_Row in HeadList)                     p_Item.IndexList.Add(p_Row.RowIndex);             }             else             {                 if (p_Item.PageNum == 1)  // 第一页特殊处理                 {                     // 计算表头前的行高                     p_Height -= Get_TableHForHeight();                     foreach (Row p_Row in HForeList)                         p_Item.IndexList.Add(p_Row.RowIndex);                     // 计算表头行的高度                     p_Height -= Get_TableHeadHeight();                     foreach (Row p_Row in HeadList)                         p_Item.IndexList.Add(p_Row.RowIndex);                 }             }             #endregion             #region 每页数据区域             // 每页数据划分             if (IsAllPrintFoot)             {                 p_Height -= Get_TableFootHeight();             // 表格高度 先减去表尾的高度             }             for (int t = startR; t < DataList.Count; t++)             {                 // 检查行内单元格是否不允许分页两种情况：条形码,图片                 if (Paging_CheckCell(DataList[t], p_Height))  // 此情况下，单元格不能分割，并且高度超过页面剩余高度，所以要启动新的一页                 {                     startR = t;                     runNext = true;                     break;                 }                 else                 {                     p_Height -= DataList[t].RowHeight;                     if (p_Height <= 0)                     {                         startR = t;                         runNext = true;                         break;                     }                     else                     {                         p_Item.IndexList.Add(DataList[t].RowIndex);                     }                 }             }             #endregion             #region 每页打印表尾             // 每页打印表尾             if (IsAllPrintFoot)             {                 foreach (Row p_Row in FootList)                     p_Item.IndexList.Add(p_Row.RowIndex);             }             #endregion             #region 添加分页页面             pages.Add(p_Item);             if (runNext)             {                 Paging_Relative(startR, ref pages);             }             #endregion         }         /// <summary>         /// 检查行内单元格如果是图片         /// 并且合并行数大于1         /// </summary>         /// <param name="cRow"></param>         /// <param name="cHeight"></param>         /// <returns></returns>         private bool Paging_CheckCell(Row cRow, float cHeight)         {             foreach (Cell cCell in cRow.RowCells)             {                 if (cCell.IsImage == true)                 {                     if (cCell.RectH > cHeight)                         return true;                 }             }             return false;         }         #endregion         #region 辅助方法         /// <summary>         /// 获取--报表全部高度         /// </summary>         /// <returns></returns>         private float Get_TableAllHeight()         {             float retHight = 0;             for (int k = 0; k < RowsList.Count; k++)             {                 Row t_Row = RowsList[k];                 retHight += t_Row.RowHeight;             }             return retHight;         }         /// <summary>         /// 获取是否设置了标题、表头、表尾 中的任意一个         /// </summary>         /// <returns></returns>         private bool Get_IsCusSet_THDF()         {             string tmType = "";             foreach (Row cusRow in this.RowsList)             {                 tmType = cusRow.RowType.ToLower().Trim();                 if (tmType == "t" || tmType == "h" || tmType == "f")                     return true;             }             return false;         }         /// <summary>         /// 获取--报表标题高度         /// </summary>         /// <returns></returns>         private float Get_TableTileHeight()         {             float retHight = 0;             for (int k = 0; k < TitleList.Count; k++)                 retHight += TitleList[k].RowHeight;             return retHight;         }         /// <summary>         /// 获取--报表表头前高度         /// </summary>         /// <returns></returns>         private float Get_TableHForHeight()         {             float retHight = 0;             for (int k = 0; k < HForeList.Count; k++)                 retHight += HForeList[k].RowHeight;             return retHight;         }         /// <summary>         /// 获取--报表表头高度         /// </summary>         /// <returns></returns>         private float Get_TableHeadHeight()         {             float retHight = 0;             for (int k = 0; k < HeadList.Count; k++)                 retHight += HeadList[k].RowHeight;             return retHight;         }         /// <summary>         /// 获取--报表表尾高度         /// </summary>         /// <returns></returns>         private float Get_TableFootHeight()         {             float retHight = 0;             for (int k = 0; k < FootList.Count; k++)                 retHight += FootList[k].RowHeight;             return retHight;         }         /// <summary>         /// 拆分报表区域         /// </summary>         public void SplitReportArea()         {             TitleList = new List<Row>();             HForeList = new List<Row>();             HeadList = new List<Row>();             DataList = new List<Row>();             FootList = new List<Row>();             for (int m = 0; m < RowsList.Count; m++)             {                 Row mmRow = RowsList[m];                 switch (mmRow.RowType.ToLower())                 {                     case "t": // 标题                         TitleList.Add(mmRow);                         break;                     case "h": // 表头                         HeadList.Add(mmRow);                         break;                     case "f": // 表尾                         FootList.Add(mmRow);                         break;                     case "d": // 数据                     default:                         DataList.Add(mmRow);                         break;                 }             }             // 设置表头前行集             if (TitleList.Count == 0 && HeadList.Count > 0)             {                 List<Row> tmpList = new List<Row>();                 for (int n = 0; n < DataList.Count; n++)                 {                     if (DataList[n].RowIndex < HeadList[0].RowIndex)                     {                         HForeList.Add(DataList[n]);                         tmpList.Add(DataList[n]);                     }                 }                 for (int n = 0; n < tmpList.Count; n++)                 {                     DataList.Remove(tmpList[n]);                 }                 tmpList.Clear();             }             // 重设表尾  不是每页打印表尾情况下，那么表位就去掉             if (!IsAllPrintFoot)             {                 foreach (Row tRow in FootList)                     DataList.Add(tRow);                 FootList.Clear();             }         }         #endregion     } }