分享我基于NPOI+ExcelReport实现的导入与导出EXCEL类库：ExcelUtility （续篇）

上周六我发表的文章《分享我基于NPOI+ExcelReport实现的导入与导出EXCEL类库：ExcelUtility》受到了大家的热烈支持与推荐，再此表示感谢，该ExcelUtility类库自上次发文起，又经过了多次的改进，增加了许多的功能与方法，可以全面满足大家的需求，下面先来看一下新方法的测试结果：

第一个新增功能，列宽自适应，当超过30个字符则将单元格内容设为换行

任意一个无模板的导出方法均支持该功能，示例代码如下：

        /// <summary>
        /// 测试方法：测试将DataTable导出到EXCEL，无模板
        /// </summary>
        [TestMethod]
        public void TestExportToExcelByDataTable()
        {
            DataTable dt = GetDataTable();
            string excelPath = ExcelUtility.Export.ToExcel(dt, "导出结果");
            Assert.IsTrue(File.Exists(excelPath));
        }

结果如下图示：

第二个新增功能，依据数据源（DataTable、DataGridView）的列类型自动将与之对应的EXCEL列的单元格式设为相同的格式内容显示，如：整数类型显示在单元格内无小数的数字格式，有小数位的类显示在单元格内2位小数数字格式，日期类型显示在单元格内日期+时间的日期格式，布尔类型显示在单元格内布尔格式，任意一个无模板的导出方法均支持该功能，示例代码如下：

        /// <summary>
        /// 测试方法：测试将DataTable导出到EXCEL，无模板，且指定导出的列名，以及导出列名的重命名
        /// </summary>
        [TestMethod]
        public void TestExportToExcelByDataTable3()
        {
            DataTable dt = GetDataTable();
            string[] expColNames = { "Col1", "Col2", "Col3", "Col4", "Col5", "Col7" };
            Dictionary<string, string> expColAsNames = new Dictionary<string, string>() {
                {"Col1","列一"},
                {"Col2","列二"},
                {"Col3","列三"},
                {"Col4","数字列"},
                {"Col5","列五"},
                {"Col7","日期列"}
            };
            string excelPath = ExcelUtility.Export.ToExcel(dt, "导出结果", null, expColNames, expColAsNames);
            Assert.IsTrue(File.Exists(excelPath));
        }

结果如下图示：

第三个新增功能，在第二个新增功能的基础上，增加可以自定义设置列的单元格显示格式（支持日期类型、数字类型），任意一个无模板的导出方法均支持该功能，示例代码如下：

        /// <summary>
        /// 测试方法：测试将DataTable导出到EXCEL，无模板，且指定某些列的显示格式
        /// </summary>
        [TestMethod]
        public void TestExportToExcelByDataTable6()
        {
            DataTable dt = GetDataTable();
            var colDataFormatDic = new Dictionary<string, string>
            {
                {"Col4","0.000"}, //将Col4列DOUBLE类型的EXCEL对应列格式设置为显示成3位小数（默认为2位小数）
                {"Col7","yyyy-mm-dd"}//将Col7列DateTime类型的EXCEL对应列格式设置为年月日（默认为yyyy/mm/dd hh:mm:ss）
            };
            //更多设置格式可在EXCEL的设置单元格格式中的数字选项卡中的自定义格式列表（若无，可自定义，建议先在EXCEL中测试好格式字符串后再用于程序中）

            string excelPath = ExcelUtility.Export.ToExcel(dt, "导出结果", colDataFormats: colDataFormatDic);
            Assert.IsTrue(File.Exists(excelPath));
        }

结果如下图示：

换种格式定义测试：

        /// <summary>
        /// 测试方法：测试将DataTable导出到EXCEL，无模板，且指定某些列的显示格式
        /// </summary>
        [TestMethod]
        public void TestExportToExcelByDataTable7()
        {
            DataTable dt = GetDataTable();
            var colDataFormatDic = new Dictionary<string, string>
            {
                {"Col4","¥#,##0.00_);(¥#,##0.00)"}, //将Col4列DOUBLE类型的EXCEL对应列格式设置为显示成包含货币格式，如：¥5.00（默认为2位小数）
                {"Col7","yyyy\"年\"m\"月\"d\"日\";@"}//将Col7列DateTime类型的EXCEL对应列格式设置为中文年月日，如：2015年12月5日（默认为yyyy/mm/dd hh:mm:ss）
            };
            //更多设置格式可在EXCEL的设置单元格格式中的数字选项卡中的自定义格式列表（若无，可自定义，建议先在EXCEL中测试好格式字符串后再用于程序中）

            string excelPath = ExcelUtility.Export.ToExcel(dt, "导出结果", colDataFormats: colDataFormatDic);
            Assert.IsTrue(File.Exists(excelPath));
        }

结果如下图示：

注意事项说明：想要实现导出的EXCEL单元格依据数据类型自动设置或手动指定格式，需首先确保数据源的列与自动或手动设置的格式相符，即列类型必需是数字类型、日期类型、布尔类型，不能是以字符串的形式存在的这些所谓的“数字类型、日期类型、布尔类型”

第四个新增的功能，可指定DataGridView是否可以导出隐藏列（不显示的列）、及指定依据DataGridView标题列名导出相应列数据，示例代码如下：

        /// <summary>
        /// 测试方法：测试将DataGridView数据导出到EXCEL文件，无模板，且不导出隐藏列
        /// </summary>
        [TestMethod]
        public void TestToExcelByDataGridView()
        {
            var grid = GetDataGridViewWithData();
            string excelPath = ExcelUtility.Export.ToExcel(grid, "导出结果", null, false);
            Assert.IsTrue(File.Exists(excelPath));
        }

结果如下图示：

第五个新增功能，DataGridView若改变列的显示位置，导出的数据也能与界面显示的数据同步调整，示例代码如下：

        /// <summary>
        /// 测试方法：测试将DataGridView数据导出到EXCEL文件，无模板,改变列的显示位置,导出隐藏列
        /// </summary>
        [TestMethod]
        public void TestToExcelByDataGridView2()
        {
            var grid = GetDataGridViewWithData();
            //模拟改变列的显示位置
            grid.Columns[0].DisplayIndex = 1;
            grid.Columns[1].DisplayIndex = 0;
            string excelPath = ExcelUtility.Export.ToExcel(grid, "导出结果", null, true);
            Assert.IsTrue(File.Exists(excelPath));
        }

结果如下图示：

以下是GetDataGridViewWithData模拟数据方法：

        private DataGridView GetDataGridViewWithData()
        {
            var grid = new DataGridView();
            var dt = GetDataTable();
            foreach (DataColumn col in dt.Columns)
            {
                bool v = col.Ordinal > 4 ? false : true;
                grid.Columns.Add(new DataGridViewTextBoxColumn() { DataPropertyName = col.ColumnName, HeaderText ="列名" + col.ColumnName , Visible = v,ValueType=col.DataType });
            }
            foreach (DataRow row in dt.Rows)
            {
                ArrayList values = new ArrayList();
                foreach (DataColumn col in dt.Columns)
                {
                    values.Add(row[col]);
                }
                grid.Rows.Add(values.ToArray());
            }
            return grid;
        }

　　

我相信这些功能加上上次的功能，应该能满足大家日常工作中所遇到的各种导出EXCEL场景吧，下面重新公布一下两个核心的与导出相关类源代码，以供大家参考，若有不足之处，敬请指出，谢谢！

ExcelUtility.Export:

using ExcelReport;
using ExcelUtility.Base;
using NPOI.SS.UserModel;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace ExcelUtility
{
    /// <summary>
    /// EXCEL导出功能集合类
    /// 作者：Zuowenjun
    /// 日期：2016/1/15
    /// </summary>
    public sealed class Export
    {
        /// <summary>
        /// 由DataSet导出Excel
        /// </summary>
        /// <param name="sourceTable">要导出数据的DataTable</param>
        /// <param name="filePath">导出路径，可选</param>
        /// <returns></returns>
        public static string ToExcel(DataSet sourceDs, string filePath = null)
        {

            if (string.IsNullOrEmpty(filePath))
            {
                filePath = Common.GetSaveFilePath();
            }

            if (string.IsNullOrEmpty(filePath)) return null;

            bool isCompatible = Common.GetIsCompatible(filePath);

            IWorkbook workbook = Common.CreateWorkbook(isCompatible);
            ICellStyle headerCellStyle = Common.GetCellStyle(workbook, true);
            //ICellStyle cellStyle = Common.GetCellStyle(workbook);

            for (int i = 0; i < sourceDs.Tables.Count; i++)
            {
                DataTable table = sourceDs.Tables[i];
                string sheetName = string.IsNullOrEmpty(table.TableName) ? "result" + i.ToString() : table.TableName;
                ISheet sheet = workbook.CreateSheet(sheetName);
                IRow headerRow = sheet.CreateRow(0);
                Dictionary<int, ICellStyle> colStyles = new Dictionary<int, ICellStyle>();
                // handling header.
                foreach (DataColumn column in table.Columns)
                {
                    ICell headerCell = headerRow.CreateCell(column.Ordinal);
                    headerCell.SetCellValue(column.ColumnName);
                    headerCell.CellStyle = headerCellStyle;
                    sheet.AutoSizeColumn(headerCell.ColumnIndex);
                    colStyles[headerCell.ColumnIndex] = Common.GetCellStyle(workbook);
                }

                // handling value.
                int rowIndex = 1;

                foreach (DataRow row in table.Rows)
                {
                    IRow dataRow = sheet.CreateRow(rowIndex);

                    foreach (DataColumn column in table.Columns)
                    {
                        ICell cell = dataRow.CreateCell(column.Ordinal);
                        //cell.SetCellValue((row[column] ?? "").ToString());
                        //cell.CellStyle = cellStyle;
                        Common.SetCellValue(cell, (row[column] ?? "").ToString(), column.DataType,colStyles);
                        Common.ReSizeColumnWidth(sheet, cell);
                    }

                    rowIndex++;
                }
                sheet.ForceFormulaRecalculation = true;
            }

            FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
            workbook.Write(fs);
            fs.Dispose();
            workbook = null;

            return filePath;

        }

        /// <summary>
        /// 由DataTable导出Excel
        /// </summary>
        /// <param name="sourceTable">要导出数据的DataTable</param>
        /// <param name="colAliasNames">导出的列名重命名数组</param>
        /// <param name="sheetName">工作薄名称，可选</param>
        /// <param name="filePath">导出路径，可选</param>
        /// <param name="colDataFormats">列格式化集合，可选</param>
        /// <returns></returns>
        public static string ToExcel(DataTable sourceTable, string[] colAliasNames, string sheetName = "result", string filePath = null, IDictionary<string, string> colDataFormats = null)
        {
            if (sourceTable.Rows.Count <= 0) return null;

            if (string.IsNullOrEmpty(filePath))
            {
                filePath = Common.GetSaveFilePath();
            }

            if (string.IsNullOrEmpty(filePath)) return null;

            if (colAliasNames == null || sourceTable.Columns.Count != colAliasNames.Length)
            {
                throw new ArgumentException("列名重命名数组与DataTable列集合不匹配。", "colAliasNames");
            }

            bool isCompatible = Common.GetIsCompatible(filePath);

            IWorkbook workbook = Common.CreateWorkbook(isCompatible);
            ICellStyle headerCellStyle = Common.GetCellStyle(workbook, true);
            //ICellStyle cellStyle = Common.GetCellStyle(workbook);
            Dictionary<int, ICellStyle> colStyles = new Dictionary<int, ICellStyle>();

            ISheet sheet = workbook.CreateSheet(sheetName);
            IRow headerRow = sheet.CreateRow(0);
            // handling header.
            foreach (DataColumn column in sourceTable.Columns)
            {
                ICell headerCell = headerRow.CreateCell(column.Ordinal);
                headerCell.SetCellValue(colAliasNames[column.Ordinal]);
                headerCell.CellStyle = headerCellStyle;
                sheet.AutoSizeColumn(headerCell.ColumnIndex);
                if (colDataFormats != null && colDataFormats.ContainsKey(column.ColumnName))
                {
                    colStyles[headerCell.ColumnIndex] = Common.GetCellStyleWithDataFormat(workbook, colDataFormats[column.ColumnName]);
                }
                else
                {
                    colStyles[headerCell.ColumnIndex] = Common.GetCellStyle(workbook);
                }
            }

            // handling value.
            int rowIndex = 1;

            foreach (DataRow row in sourceTable.Rows)
            {
                IRow dataRow = sheet.CreateRow(rowIndex);

                foreach (DataColumn column in sourceTable.Columns)
                {
                    ICell cell = dataRow.CreateCell(column.Ordinal);
                    //cell.SetCellValue((row[column] ?? "").ToString());
                    //cell.CellStyle = cellStyle;
                    Common.SetCellValue(cell, (row[column] ?? "").ToString(), column.DataType, colStyles);
                    Common.ReSizeColumnWidth(sheet, cell);
                }

                rowIndex++;
            }
            sheet.ForceFormulaRecalculation = true;

            FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
            workbook.Write(fs);
            fs.Dispose();

            sheet = null;
            headerRow = null;
            workbook = null;

            return filePath;
        }

        /// <summary>
        /// 由DataGridView导出
        /// </summary>
        /// <param name="grid">要导出的DataGridView对象</param>
        /// <param name="sheetName">工作薄名称，可选</param>
        /// <param name="filePath">导出路径，可选</param>
        /// <param name="includeHiddenCol">导出时是否包含隐藏列，可选</param>
        /// <param name="colHeaderTexts">指定导出DataGridView的列标题名数组，可选</param>
        /// <param name="colDataFormats">列格式化集合，可选</param>
        /// <returns></returns>
        public static string ToExcel(DataGridView grid, string sheetName = "result", string filePath = null, bool includeHiddenCol = false, string[] colHeaderTexts = null, IDictionary<string, string> colDataFormats = null)
        {
            if (grid.Rows.Count <= 0) return null;

            if (string.IsNullOrEmpty(filePath))
            {
                filePath = Common.GetSaveFilePath();
            }

            if (string.IsNullOrEmpty(filePath)) return null;

            bool isCompatible = Common.GetIsCompatible(filePath);

            DataGridViewColumn[] expCols = null;
            expCols = grid.Columns.Cast<DataGridViewColumn>().OrderBy(c => c.DisplayIndex).ToArray();
            if (!includeHiddenCol)
            {
                expCols = expCols.Where(c => c.Visible).ToArray();
            }

            if (colHeaderTexts != null && colHeaderTexts.Length > 0)
            {
                expCols = expCols.Where(c => colHeaderTexts.Contains(c.HeaderText)).ToArray();
            }

            IWorkbook workbook = Common.CreateWorkbook(isCompatible);
            ICellStyle headerCellStyle = Common.GetCellStyle(workbook, true);
            //ICellStyle cellStyle = Common.GetCellStyle(workbook);
            ISheet sheet = workbook.CreateSheet(sheetName);

            IRow headerRow = sheet.CreateRow(0);

            Dictionary<int, ICellStyle> colStyles = new Dictionary<int, ICellStyle>();
            for (int i = 0; i < expCols.Length; i++)
            {
                ICell headerCell = headerRow.CreateCell(i);
                headerCell.SetCellValue(expCols[i].HeaderText);
                headerCell.CellStyle = headerCellStyle;
                sheet.AutoSizeColumn(headerCell.ColumnIndex);
                if (colDataFormats != null && colDataFormats.ContainsKey(expCols[i].HeaderText))
                {
                    colStyles[headerCell.ColumnIndex] = Common.GetCellStyleWithDataFormat(workbook, colDataFormats[expCols[i].HeaderText]);
                }
                else
                {
                    colStyles[headerCell.ColumnIndex] = Common.GetCellStyle(workbook);
                }
            }

            int rowIndex = 1;
            foreach (DataGridViewRow row in grid.Rows)
            {
                IRow dataRow = sheet.CreateRow(rowIndex);
                for (int n = 0; n < expCols.Length; n++)
                {
                    ICell cell = dataRow.CreateCell(n);
                    //cell.SetCellValue((row.Cells[expCols[n].Index].Value ?? "").ToString());
                    //cell.CellStyle = cellStyle;
                    Common.SetCellValue(cell, (row.Cells[expCols[n].Index].Value ?? "").ToString(), expCols[n].ValueType, colStyles);
                    Common.ReSizeColumnWidth(sheet, cell);
                }
                rowIndex++;
            }
            sheet.ForceFormulaRecalculation = true;

            FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
            workbook.Write(fs);
            fs.Dispose();

            sheet = null;
            headerRow = null;
            workbook = null;

            return filePath;
        }

        /// <summary>
        /// 由DataTable导出Excel
        /// </summary>
        /// <param name="sourceTable">要导出数据的DataTable</param>
        /// <param name="sheetName">工作薄名称，可选</param>
        /// <param name="filePath">导出路径，可选</param>
        /// <param name="colNames">需要导出的列名,可选</param>
        /// <param name="colAliasNames">导出的列名重命名，可选</param>
        /// <param name="colDataFormats">列格式化集合，可选</param>
        /// <returns></returns>
        public static string ToExcel(DataTable sourceTable, string sheetName = "result", string filePath = null, string[] colNames = null, IDictionary<string, string> colAliasNames = null, IDictionary<string, string> colDataFormats = null)
        {
            if (sourceTable.Rows.Count <= 0) return null;

            if (string.IsNullOrEmpty(filePath))
            {
                filePath = Common.GetSaveFilePath();
            }

            if (string.IsNullOrEmpty(filePath)) return null;

            bool isCompatible = Common.GetIsCompatible(filePath);

            IWorkbook workbook = Common.CreateWorkbook(isCompatible);
            ICellStyle headerCellStyle = Common.GetCellStyle(workbook, true);
            //ICellStyle cellStyle = Common.GetCellStyle(workbook);
            Dictionary<int, ICellStyle> colStyles = new Dictionary<int, ICellStyle>();

            ISheet sheet = workbook.CreateSheet(sheetName);
            IRow headerRow = sheet.CreateRow(0);

            if (colNames == null || colNames.Length <= 0)
            {
                colNames = sourceTable.Columns.Cast<DataColumn>().OrderBy(c => c.Ordinal).Select(c => c.ColumnName).ToArray();
            }

            // handling header.
            for (int i = 0; i < colNames.Length; i++)
            {
                ICell headerCell = headerRow.CreateCell(i);
                if (colAliasNames != null && colAliasNames.ContainsKey(colNames[i]))
                {
                    headerCell.SetCellValue(colAliasNames[colNames[i]]);
                }
                else
                {
                    headerCell.SetCellValue(colNames[i]);
                }
                headerCell.CellStyle = headerCellStyle;
                sheet.AutoSizeColumn(headerCell.ColumnIndex);
                if (colDataFormats != null && colDataFormats.ContainsKey(colNames[i]))
                {
                    colStyles[headerCell.ColumnIndex] = Common.GetCellStyleWithDataFormat(workbook, colDataFormats[colNames[i]]);
                }
                else
                {
                    colStyles[headerCell.ColumnIndex] = Common.GetCellStyle(workbook);
                }
            }

            // handling value.
            int rowIndex = 1;

            foreach (DataRow row in sourceTable.Rows)
            {
                IRow dataRow = sheet.CreateRow(rowIndex);

                for (int i = 0; i < colNames.Length; i++)
                {
                    ICell cell = dataRow.CreateCell(i);
                    //cell.SetCellValue((row[colNames[i]] ?? "").ToString());
                    //cell.CellStyle = cellStyle;
                    Common.SetCellValue(cell, (row[colNames[i]] ?? "").ToString(), sourceTable.Columns[colNames[i]].DataType,colStyles);
                    Common.ReSizeColumnWidth(sheet, cell);
                }

                rowIndex++;
            }
            sheet.ForceFormulaRecalculation = true;

            FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
            workbook.Write(fs);
            fs.Dispose();

            sheet = null;
            headerRow = null;
            workbook = null;

            return filePath;
        }

        /// <summary>
        ///由SheetFormatterContainer导出基于EXCEL模板的文件
        /// </summary>
        /// <param name="templatePath">模板路径</param>
        /// <param name="sheetName">模板中使用的工作薄名称</param>
        /// <param name="formatterContainer">模板数据格式化容器</param>
        /// <param name="filePath">导出路径，可选</param>
        /// <returns></returns>

        public static string ToExcelWithTemplate<T>(string templatePath, string sheetName, SheetFormatterContainer<T> formatterContainer, string filePath = null)
        {

            if (!File.Exists(templatePath))
            {
                throw new FileNotFoundException(templatePath + "文件不存在！");
            }

            if (string.IsNullOrEmpty(filePath))
            {
                filePath = Common.GetSaveFilePath();
            }

            if (string.IsNullOrEmpty(filePath)) return null;

            string templateConfigFilePath = Common.GetTemplateConfigFilePath(templatePath, false);

            var workbookParameterContainer = new WorkbookParameterContainer();
            workbookParameterContainer.Load(templateConfigFilePath);
            SheetParameterContainer sheetParameterContainer = workbookParameterContainer[sheetName];
            ExportHelper.ExportToLocal(templatePath, filePath, new SheetFormatter(sheetName, formatterContainer.GetFormatters(sheetParameterContainer)));

            return filePath;
        }

        /// <summary>
        /// 由SheetFormatterContainer集合导出基于EXCEL模板（多工作薄）的文件
        /// </summary>
        /// <param name="templatePath"></param>
        /// <param name="formatterContainers"></param>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public static string ToExcelWithTemplate(string templatePath,IDictionary<string,SheetFormatterContainer<dynamic>> formatterContainers, string filePath = null)
        {
            if (!File.Exists(templatePath))
            {
                throw new FileNotFoundException(templatePath + "文件不存在！");
            }

            if (string.IsNullOrEmpty(filePath))
            {
                filePath = Common.GetSaveFilePath();
            }

            if (string.IsNullOrEmpty(filePath)) return null;

            string templateConfigFilePath = Common.GetTemplateConfigFilePath(templatePath, false);

            var workbookParameterContainer = new WorkbookParameterContainer();
            workbookParameterContainer.Load(templateConfigFilePath);
            List<SheetFormatter> sheetFormatterList = new List<SheetFormatter>();
            foreach (var item in formatterContainers)
            {
                SheetParameterContainer sheetParameterContainer = workbookParameterContainer[item.Key];
                sheetFormatterList.Add(new SheetFormatter(item.Key, item.Value.GetFormatters(sheetParameterContainer)));
            }
            ExportHelper.ExportToLocal(templatePath, filePath,sheetFormatterList.ToArray());

            return filePath;
        }

    }
}

ExcelUtility.Base.Common：

using ExcelReport;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows.Forms;

namespace ExcelUtility.Base
{
    /// <summary>
    /// ExcelUtility类库内部通用功能类
    /// 作者：Zuowenjun
    /// 日期：2016/1/15
    /// </summary>
    internal static class Common
    {
        public static string DesktopDirectory = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);

        /// <summary>
        /// 获取要保存的文件名称（含完整路径）
        /// </summary>
        /// <returns></returns>
        public static string GetSaveFilePath()
        {
            SaveFileDialog saveFileDig = new SaveFileDialog();
            saveFileDig.Filter = "Excel Office97-2003(*.xls)|*.xls|Excel Office2007及以上(*.xlsx)|*.xlsx";
            saveFileDig.FilterIndex = 0;
            saveFileDig.Title = "导出到";
            saveFileDig.OverwritePrompt = true;
            saveFileDig.InitialDirectory = DesktopDirectory;
            string filePath = null;
            if (saveFileDig.ShowDialog() == DialogResult.OK)
            {
                filePath = saveFileDig.FileName;
            }

            return filePath;
        }

        /// <summary>
        /// 获取要打开要导入的文件名称（含完整路径）
        /// </summary>
        /// <returns></returns>
        public static string GetOpenFilePath()
        {
            OpenFileDialog openFileDig = new OpenFileDialog();
            openFileDig.Filter = "Excel Office97-2003(*.xls)|*.xls|Excel Office2007及以上(*.xlsx)|*.xlsx";
            openFileDig.FilterIndex = 0;
            openFileDig.Title = "打开";
            openFileDig.CheckFileExists = true;
            openFileDig.CheckPathExists = true;
            openFileDig.InitialDirectory = Common.DesktopDirectory;
            string filePath = null;
            if (openFileDig.ShowDialog() == DialogResult.OK)
            {
                filePath = openFileDig.FileName;
            }

            return filePath;
        }

        /// <summary>
        /// 判断是否为兼容模式
        /// </summary>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public static bool GetIsCompatible(string filePath)
        {
            return filePath.EndsWith(".xls", StringComparison.OrdinalIgnoreCase);
        }

        /// <summary>
        /// 创建工作薄
        /// </summary>
        /// <param name="isCompatible"></param>
        /// <returns></returns>
        public static IWorkbook CreateWorkbook(bool isCompatible)
        {
            if (isCompatible)
            {
                return new HSSFWorkbook();
            }
            else
            {
                return new XSSFWorkbook();
            }
        }

        /// <summary>
        /// 创建工作薄(依据文件流)
        /// </summary>
        /// <param name="isCompatible"></param>
        /// <param name="stream"></param>
        /// <returns></returns>
        public static IWorkbook CreateWorkbook(bool isCompatible, dynamic stream)
        {
            if (isCompatible)
            {
                return new HSSFWorkbook(stream);
            }
            else
            {
                return new XSSFWorkbook(stream);
            }
        }

        /// <summary>
        /// 创建单元格样式
        /// </summary>
        /// <param name="sheet"></param>
        /// <returns></returns>
        public static ICellStyle GetCellStyle(IWorkbook workbook, bool isHeaderRow = false)
        {
            ICellStyle style = workbook.CreateCellStyle();

            if (isHeaderRow)
            {
                style.FillPattern = FillPattern.SolidForeground;
                style.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.Grey25Percent.Index;
                IFont f = workbook.CreateFont();
                f.Boldweight = (short)FontBoldWeight.Bold;
                style.SetFont(f);
            }

            style.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
            style.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
            style.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
            style.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
            return style;
        }

        /// <summary>
        /// 根据单元格内容重新设置列宽
        /// </summary>
        /// <param name="sheet"></param>
        /// <param name="cell"></param>
        public static void ReSizeColumnWidth(ISheet sheet, ICell cell)
        {
            int cellLength = (Encoding.Default.GetBytes(cell.ToString()).Length + 2) * 256;
            const int maxLength = 60 * 256; //255 * 256;
            if (cellLength > maxLength) //当单元格内容超过30个中文字符（英语60个字符）宽度，则强制换行
            {
                cellLength = maxLength;
                cell.CellStyle.WrapText = true;
            }
            int colWidth = sheet.GetColumnWidth(cell.ColumnIndex);
            if (colWidth < cellLength)
            {
                sheet.SetColumnWidth(cell.ColumnIndex, cellLength);
            }
        }

        /// <summary>
        /// 创建单元格样式并设置数据格式化规则
        /// </summary>
        /// <param name="cell"></param>
        /// <param name="format"></param>
        public static ICellStyle GetCellStyleWithDataFormat(IWorkbook workbook, string format)
        {
            var style = GetCellStyle(workbook);
            var dataFormat = workbook.CreateDataFormat();
            short formatId = -1;
            if (dataFormat is HSSFDataFormat)
            {
                formatId = HSSFDataFormat.GetBuiltinFormat(format);
            }
            if (formatId != -1)
            {
                style.DataFormat = formatId;
            }
            else
            {
                style.DataFormat = dataFormat.GetFormat(format);
            }
            return style;
        }

        /// <summary>
        /// 依据值类型为单元格设置值
        /// </summary>
        /// <param name="cell"></param>
        /// <param name="value"></param>
        /// <param name="colType"></param>
        public static void SetCellValue(ICell cell, string value, Type colType, IDictionary<int, ICellStyle> colStyles)
        {
            string dataFormatStr = null;
            switch (colType.ToString())
            {
                case "System.String": //字符串类型
                    cell.SetCellType(CellType.String);
                    cell.SetCellValue(value);
                    break;
                case "System.DateTime": //日期类型
                    DateTime dateV = new DateTime();
                    DateTime.TryParse(value, out dateV);
                    cell.SetCellValue(dateV);
                    dataFormatStr = "yyyy/mm/dd hh:mm:ss";
                    break;
                case "System.Boolean": //布尔型
                    bool boolV = false;
                    bool.TryParse(value, out boolV);
                    cell.SetCellType(CellType.Boolean);
                    cell.SetCellValue(boolV);
                    break;
                case "System.Int16": //整型
                case "System.Int32":
                case "System.Int64":
                case "System.Byte":
                    int intV = 0;
                    int.TryParse(value, out intV);
                    cell.SetCellType(CellType.Numeric);
                    cell.SetCellValue(intV);
                    dataFormatStr = "0";
                    break;
                case "System.Decimal": //浮点型
                case "System.Double":
                    double doubV = 0;
                    double.TryParse(value, out doubV);
                    cell.SetCellType(CellType.Numeric);
                    cell.SetCellValue(doubV);
                    dataFormatStr = "0.00";
                    break;
                case "System.DBNull": //空值处理
                    cell.SetCellType(CellType.Blank);
                    cell.SetCellValue("");
                    break;
                default:
                    cell.SetCellType(CellType.Unknown);
                    cell.SetCellValue(value);
                    break;
            }

            if (!string.IsNullOrEmpty(dataFormatStr) && colStyles[cell.ColumnIndex].DataFormat <= 0) //没有设置，则采用默认类型格式
            {
                colStyles[cell.ColumnIndex] = GetCellStyleWithDataFormat(cell.Sheet.Workbook, dataFormatStr);
            }
            cell.CellStyle = colStyles[cell.ColumnIndex];
        }

        /// <summary>
        /// 从工作表中生成DataTable
        /// </summary>
        /// <param name="sheet"></param>
        /// <param name="headerRowIndex"></param>
        /// <returns></returns>
        public static DataTable GetDataTableFromSheet(ISheet sheet, int headerRowIndex)
        {
            DataTable table = new DataTable();

            IRow headerRow = sheet.GetRow(headerRowIndex);
            int cellCount = headerRow.LastCellNum;

            for (int i = headerRow.FirstCellNum; i < cellCount; i++)
            {
                if (headerRow.GetCell(i) == null || headerRow.GetCell(i).StringCellValue.Trim() == "")
                {
                    // 如果遇到第一个空列，则不再继续向后读取
                    cellCount = i;
                    break;
                }
                DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
                table.Columns.Add(column);
            }

            for (int i = (headerRowIndex + 1); i <= sheet.LastRowNum; i++)
            {
                IRow row = sheet.GetRow(i);
                //如果遇到某行的第一个单元格的值为空，则不再继续向下读取
                if (row != null && !string.IsNullOrEmpty(row.GetCell(0).ToString()))
                {
                    DataRow dataRow = table.NewRow();

                    for (int j = row.FirstCellNum; j < cellCount; j++)
                    {
                        dataRow[j] = row.GetCell(j).ToString();
                    }

                    table.Rows.Add(dataRow);
                }
            }

            return table;
        }

        /// <summary>
        /// 获取模板文件对应的模板格式配置XML文件路径（当不存在或较旧时，将会重新生成）
        /// </summary>
        /// <param name="templatePath"></param>
        /// <param name="newGenerate"></param>
        /// <returns></returns>
        public static string GetTemplateConfigFilePath(string templatePath, bool newGenerate = false)
        {
            string templateConfigFilePath = Path.ChangeExtension(templatePath, ".xml");
            if (newGenerate || !File.Exists(templateConfigFilePath) || File.GetLastWriteTime(templatePath) > File.GetLastWriteTime(templateConfigFilePath))
            {
                WorkbookParameterContainer workbookParameter = ParseTemplate.Parse(templatePath);
                workbookParameter.Save(templateConfigFilePath);
            }

            return templateConfigFilePath;
        }

    }
}

第六个新增功能，支持模板中包含多个工作薄导出（目前这个方法还没有模拟测试，所以无法保证其一定有效，大家可以试试），该方法定义如下：

        /// <summary>
        /// 由SheetFormatterContainer集合导出基于EXCEL模板（多工作薄）的文件
        /// </summary>
        /// <param name="templatePath"></param>
        /// <param name="formatterContainers"></param>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public static string ToExcelWithTemplate(string templatePath,IDictionary<string,SheetFormatterContainer<dynamic>> formatterContainers, string filePath = null)
        {
            if (!File.Exists(templatePath))
            {
                throw new FileNotFoundException(templatePath + "文件不存在！");
            }

            if (string.IsNullOrEmpty(filePath))
            {
                filePath = Common.GetSaveFilePath();
            }

            if (string.IsNullOrEmpty(filePath)) return null;

            string templateConfigFilePath = Common.GetTemplateConfigFilePath(templatePath, false);

            var workbookParameterContainer = new WorkbookParameterContainer();
            workbookParameterContainer.Load(templateConfigFilePath);
            List<SheetFormatter> sheetFormatterList = new List<SheetFormatter>();
            foreach (var item in formatterContainers)
            {
                SheetParameterContainer sheetParameterContainer = workbookParameterContainer[item.Key];
                sheetFormatterList.Add(new SheetFormatter(item.Key, item.Value.GetFormatters(sheetParameterContainer)));
            }
            ExportHelper.ExportToLocal(templatePath, filePath,sheetFormatterList.ToArray());

            return filePath;
        }

该类库源码已分享到该路径中：http://git.oschina.net/zuowj/ExcelUtility　　　　GIT Repository路径：git@git.oschina.net:zuowj/ExcelUtility.git   （会持续更新及修正BUG）