net core 使用 Npoi 生成 Word文档

需求：按数据层级生成WORD文件，要有目录，目录里要有真实的页码，附件内容用表格显示，大标题 做为封面当独显示一页，

PDF内容

大标题，

目录（里有对应的页码）

正文 里有 表格

重点：NPOI 在生成word文件时不会自动生成总页数，所以本人使用了一个固定行索引来计算页码的功能。 使用 12 号字体，一页是44行，按这个方法计算页码。有更好的方法可以在评论区告诉我。

表格使用方法也要注意：

1.注意 CreateTable()方法里会默认添加一行，这时如果使用 table.CreateRow() 方法创建新行这时就会有两行。第一行为只有一个默认的单元格。所有正确的方法是使用table.GetRow(0)方法
2.注意 table.CreateRow()方法也会默认添一列，由于第一行已确定了表格的列数所要直接使用GetCell(0)方法获取列对象，0表示列索引 AddNewTableCell()方法会在第一行的列数上再加列，所以正确的用法是GetCell(0)方法

/// <summary>
        /// 生成报告详情文件 pdf
        /// </summary>
        /// <param name="model"></param>
        /// <param name="caseDetailsViewModels"></param>
        /// <param name="TargetPath">目录路径</param>
        /// <param name="NewFileName">文件名</param>
        /// <returns></returns>
        private static string generateWordFile(ViewModel model, List<detailsViewModel> detailsViewModels, string TargetPath, string NewFileName)
        {
            string outMergeFile = TargetPath + NewFileName;
            int rowIndex = 0;//行索引
            //TODO:使用FileStream文件流来写入数据（传入参数为：文件所在路径，对文件的操作方式，对文件内数据的操作）
            //通过使用文件流，创建文件流对象，向文件流中写入内容，并保存为Word文档格式
            using (var stream = new FileStream(outMergeFile, FileMode.Create, FileAccess.Write))
            {
                //创建document文档对象对象实例
                XWPFDocument document = new XWPFDocument();
                /**
                 *这里我通过设置公共的Word文档中SetParagraph（段落）实例创建和段落样式格式设置，大大减少了代码的冗余，
                 * 避免每使用一个段落而去创建一次段落实例和设置段落的基本样式
                 *(如下，ParagraphInstanceSetting为段落实例创建和样式设置，后面索引表示为当前是第几行段落,索引从0开始)
                 */
                //12号字 44行一页
                //for (int i = 1; i <= 50; i++)
                //{
                //    document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, i.ToString(), true, 12, "黑体", ParagraphAlignment.CENTER), rowIndex);
                //    rowIndex++;
                //}
                int iPageNum = 1;//页索引
                int pageRowCount = 44;//每页44行
                //第一页
                for (int i = 1; i <= 21; i++)
                {
                    document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, String.Empty, true, 12, "黑体", ParagraphAlignment.CENTER), rowIndex);
                    rowIndex++;
                }
                //文本标题 要显示一页
                document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, model.TitleModel.F_ContentStr ?? string.Empty, true, 20, "黑体", ParagraphAlignment.CENTER), rowIndex);
                rowIndex++;
                for (int i = 1; i <= 22; i++)
                {
                    document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, String.Empty, true, 12, "黑体", ParagraphAlignment.CENTER), rowIndex);
                    rowIndex++;
                }
                //空行
                //document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, string.Empty, true, 12, "宋体", ParagraphAlignment.LEFT), rowIndex);
                //rowIndex++;
                document.GetProperties().ExtendedProperties.GetUnderlyingProperties().Pages = iPageNum;

                var fontSizeTwoTitle = 16;
                var fontSizeTwoBody = 12;
                var fontSize = 12;
                iPageNum++;
                //目录最大行索引
                var catalogueRowCount = iPageNum * pageRowCount;

                document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, "目录", true, 16, "黑体", ParagraphAlignment.CENTER), rowIndex);
                setWordPages(document, ref rowIndex, pageRowCount, ref iPageNum);
                //一、检索目的...............................................4～4
                var catalogueTest = "一、检索目的...............................................4～4";
                //目录 要显示一页
                //TODO:这里一行需要显示两个文本
                foreach (var item in model.TwoTitleList)
                {
                    if (!string.IsNullOrEmpty(item.F_ContentStr))
                    {
                        StringBuilder catalogueText = new StringBuilder(item.F_ContentStr);//string.Format(" {0}.{1}", item.F_ContentStr ?? string.Empty, item.F_Page ?? "1～1");
                        string pageNameTxt = !string.IsNullOrEmpty(item.F_Page) ? item.F_Page : "1～1";
                        int beginI = catalogueText.ToString().Length + pageNameTxt.Length;
                        for (int i = beginI; i < catalogueTest.Length; i++)
                        {
                            catalogueText.Append(".");
                        }
                        catalogueText.Append(pageNameTxt);
                        document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, catalogueText.ToString(), false, fontSize, "宋体", ParagraphAlignment.LEFT), rowIndex);
                        setWordPages(document, ref rowIndex, pageRowCount, ref iPageNum);
                    }
                }
                for (int i = rowIndex; i < catalogueRowCount; i++)
                {
                    document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, String.Empty, true, 12, "黑体", ParagraphAlignment.CENTER), rowIndex);
                    setWordPages(document, ref rowIndex, pageRowCount, ref iPageNum);
                }

                #region 正文 从第三页开始
                iPageNum = 3;
                int beginPageNum = 3;
                foreach (var item in model.TwoTitleList)
                {
                    beginPageNum = document.GetProperties().ExtendedProperties.GetUnderlyingProperties().Pages;
                    //标题
                    document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, string.Format("{0}", item.F_ContentStr ?? string.Empty), false, fontSizeTwoTitle, "宋体", ParagraphAlignment.LEFT, false, String.Empty, "165DFF"), rowIndex);
                    setWordPages(document, ref rowIndex, pageRowCount, ref iPageNum);

                    foreach (var itemThree in item.ThreeContentList)
                    {
                        itemThree.F_ContentStr = itemThree.F_ContentStr.Replace("\r\n", string.Empty);
                        //内容
                        if (itemThree.F_ContentStr.Contains("</p>"))
                        {
                            var contentStr = itemThree.F_ContentStr.Replace("<p>", string.Empty);
                            var contentList = contentStr.Split("</p>");
                            foreach (var itemCon in contentList)
                            {
                                var itemConTxt = itemCon.Replace("\n", string.Empty).Trim();
                                document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, string.Format("    {0}", itemConTxt), false, fontSizeTwoBody, "宋体", ParagraphAlignment.LEFT), rowIndex);
                                setWordPages(document, ref rowIndex, pageRowCount, ref iPageNum);
                            }
                        }
                        else
                        {
                            var F_ContentStrTxt = itemThree.F_ContentStr.Replace("\n", string.Empty).Trim();
                            document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, string.Format("    {0}", F_ContentStrTxt), false, fontSizeTwoBody, "宋体", ParagraphAlignment.LEFT), rowIndex);
                            setWordPages(document, ref rowIndex, pageRowCount, ref iPageNum);
                        }
                    }
                    int pages = document.GetProperties().ExtendedProperties.GetUnderlyingProperties().Pages;
                    item.F_Page = string.Format("{0}～{1}", beginPageNum, pages);
                    iPageNum = pages;
                }
                #endregion

                #region 附件
                if (model.FileList != null && model.FileList.Count > 0)
                {
                    document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, "    （一）检索结果分析列表", false, fontSizeTwoTitle, "宋体", ParagraphAlignment.LEFT), rowIndex);
                    setWordPages(document, ref rowIndex, pageRowCount, ref iPageNum);

                    document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, "  ", false, fontSize, "宋体", ParagraphAlignment.LEFT), rowIndex);
                    setWordPages(document, ref rowIndex, pageRowCount, ref iPageNum);

                    int groupNum = 1;
                    foreach (var item in model.FileList)
                    {
                        var KeywordTxt = !string.IsNullOrEmpty(item.Keyword) ? item.Keyword : string.Empty;
                        KeywordTxt = KeywordTxt.Replace("\n", string.Empty).Trim();
                        document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, string.Format("    {0}", KeywordTxt), false, fontSizeTwoBody, "宋体", ParagraphAlignment.LEFT), rowIndex);
                        setWordPages(document, ref rowIndex, pageRowCount, ref iPageNum);
                        document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, "  ", false, fontSize, "宋体", ParagraphAlignment.LEFT), rowIndex);
                        setWordPages(document, ref rowIndex, pageRowCount, ref iPageNum);

                        //注意CreateTable()方法里会默认添加一行，这时如果使用 table.CreateRow() 方法创建新行这时就会有两行。第一行为只有一个默认的单元格
                        //所有正确的方法是使用table.GetRow(0);方法
                        var table = document.CreateTable();
                        XWPFTableRow tableHeadRow = table.GetRow(0);//新增行
                        tableHeadRow.GetCell(0).SetText("标题");
                        tableHeadRow.GetCell(0).SetVerticalAlignment(XWPFTableCell.XWPFVertAlign.CENTER);
                        
                        var tableHeadRowCell_CaseCode = tableHeadRow.AddNewTableCell();
                        tableHeadRowCell_CaseCode.SetText("案号");
                        tableHeadRowCell_CaseCode.SetVerticalAlignment(XWPFTableCell.XWPFVertAlign.CENTER);

                        var tableHeadRowCell_IsAdd = tableHeadRow.AddNewTableCell();
                        tableHeadRowCell_IsAdd.SetText("是否加入检索报告");
                        tableHeadRowCell_IsAdd.SetVerticalAlignment(XWPFTableCell.XWPFVertAlign.CENTER);

                        var tableHeadRowCell_NoAddCause = tableHeadRow.AddNewTableCell();
                        tableHeadRowCell_NoAddCause.SetText("未加入检索报告原因");
                        tableHeadRowCell_NoAddCause.SetVerticalAlignment(XWPFTableCell.XWPFVertAlign.CENTER);

                        foreach (var itemKey in item.KeywordFileList)
                        {
                            //注意 table.CreateRow()方法也会默认添一列，由于第一行已确定了表格的列数所要直接使用GetCell(0)方法获取列对象，0表示列索引
                            //AddNewTableCell()方法会在第一行的列数上再加列，所以正确的用法是GetCell(0)方法
                            XWPFTableRow tableBodyRow = table.CreateRow();//新增行
                            //var tableBodyRowCell_Title = tableBodyRow.AddNewTableCell();
                            //tableBodyRowCell_Title.SetText(itemKey.F_CaseTitle ?? String.Empty);
                            //tableBodyRowCell_Title.SetVerticalAlignment(XWPFTableCell.XWPFVertAlign.CENTER);
                            tableBodyRow.GetCell(0).SetText(itemKey.F_CaseTitle ?? string.Empty);

                            //var tableBodyRowCell_CaseCode = tableBodyRow.AddNewTableCell();
                            //tableBodyRowCell_CaseCode.SetText(itemKey.F_CaseCode ?? String.Empty);
                            //tableBodyRowCell_CaseCode.SetVerticalAlignment(XWPFTableCell.XWPFVertAlign.CENTER);
                            tableBodyRow.GetCell(1).SetText(itemKey.F_CaseCode ?? string.Empty);

                            //var tableBodyRowCell_IsAdd = tableBodyRow.AddNewTableCell();
                            //tableBodyRowCell_IsAdd.SetText(itemKey.F_IsAdd ? "是" : "否");
                            //tableBodyRowCell_IsAdd.SetVerticalAlignment(XWPFTableCell.XWPFVertAlign.CENTER);
                            tableBodyRow.GetCell(2).SetText(itemKey.F_IsAdd ? "是" : "否");
                            tableBodyRow.GetCell(2).SetVerticalAlignment(XWPFTableCell.XWPFVertAlign.CENTER);

                            //var tableBodyRowCell_NoAddCause = tableBodyRow.AddNewTableCell();
                            //tableBodyRowCell_NoAddCause.SetText(itemKey.F_NoAddCause ?? String.Empty);
                            //tableBodyRowCell_NoAddCause.SetVerticalAlignment(XWPFTableCell.XWPFVertAlign.CENTER);
                            tableBodyRow.GetCell(3).SetText(itemKey.F_NoAddCause ?? string.Empty);

                            groupNum++;
                        }
                    }
                }
                #endregion

                #region 生成案例
                if (caseDetailsViewModels != null && caseDetailsViewModels.Count > 0)
                {
                    document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, string.Format("    （二）检索案例全文"), false, fontSize, "宋体", ParagraphAlignment.LEFT), rowIndex);
                    setWordPages(document, ref rowIndex, pageRowCount, ref iPageNum);
                    document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, "  ", false, fontSize, "宋体", ParagraphAlignment.LEFT), rowIndex);
                    setWordPages(document, ref rowIndex, pageRowCount, ref iPageNum);

                    foreach (var item in caseDetailsViewModels)
                    {
                        foreach (var itemCase in item.CaseItemList)
                        {
                            //标题
                            var F_TitleTxt = itemCase.F_Title.Replace("\r\n", string.Empty);
                            document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, string.Format("  {0}", F_TitleTxt), false, fontSize, "宋体", ParagraphAlignment.LEFT), rowIndex);
                            setWordPages(document, ref rowIndex, pageRowCount, ref iPageNum);

                            //内容
                            itemCase.F_Content = itemCase.F_Content.Replace("\r\n", string.Empty);
                            if (itemCase.F_Content.Contains("</p>"))
                            {
                                var contentStr = itemCase.F_Content.Replace("<p>", string.Empty);
                                var contentList = contentStr.Split("</p>");
                                foreach (var itemCon in contentList)
                                {
                                    var itemConTxt = itemCon.Replace("\n", string.Empty).Trim();
                                    document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, string.Format("  {0}", itemConTxt), false, fontSize, "宋体", ParagraphAlignment.LEFT), rowIndex);
                                    setWordPages(document, ref rowIndex, pageRowCount, ref iPageNum);
                                    //if (writer.PageNumber > iPageNum)
                                    //{
                                    //    writePageNumber(document, writer, BF_Light);
                                    //}
                                }
                            }
                            else
                            {
                                var F_ContentTxt = itemCase.F_Content.Replace("\n", string.Empty).Trim();
                                document.SetParagraph(NpoiWordParagraphTextStyleHelper._.ParagraphInstanceSetting(document, string.Format("  {0}", F_ContentTxt), false, fontSize, "宋体", ParagraphAlignment.LEFT), rowIndex);
                                setWordPages(document, ref rowIndex, pageRowCount, ref iPageNum);
                            }
                        }
                    }
                }
                #endregion
                //向文档流中写入内容，生成word
                document.Write(stream);
            }
            return outMergeFile;
        }

        /// <summary>
        /// 设置word的Pages 总页数
        /// </summary>
        /// <param name="document"></param>
        /// <param name="rowIndex">行索引</param>
        /// <param name="pageRowCount">每页的总行数</param>
        /// <param name="iPageNum">当前页索引</param>
        private static void setWordPages(XWPFDocument document, ref int rowIndex, int pageRowCount, ref int iPageNum)
        {
            rowIndex++;
            if (document != null)
            {
                if ((rowIndex % pageRowCount) == 0)
                {
                    iPageNum++;
                    document.GetProperties().ExtendedProperties.GetUnderlyingProperties().Pages = iPageNum;
                }
            }
        }

 调用

注意 要调用两次，第一次生成时不知道目录里的内容在第几页，第一次在生成时收集页码。这时会生成一个临时文件。第二次生成的目录里的页码才是真实有效的数据。所以要生成两次。

就好比你在写WORD时也是不知道目录里的内容会写在第几次，都是一、二级标题和内容都写完后，再去生成目录的。这里的道理也是一样的。

//word
                    var fileNameTempPath = generateWordFile(model, caseDetailsViewModels, uploadPath, fileNameTemp);
                    savePath = generateWordFile(model, caseDetailsViewModels, uploadPath, fileName);
                    //删除临时文件
                    if (File.Exists(fileNameTempPath))
                    {
                        File.Delete(fileNameTempPath);
                    }