基于NPOI+ExcelReport实现的导入与导出EXCEL类库：ExcelUtility
jopen
8年前
1. ExcelUtility功能：
1.将数据导出到EXCEL(支持XLS,XLSX，支持多种类型模板，支持列宽自适应)
类名： ExcelUtility. Export
2.将EXCEL数据导入到数据对象中（DataTable、Dataset，支持XLS,XLSX）
类名： ExcelUtility. Import
类库项目文件结构如下图示：
2. ExcelUtility依赖组件：
1.NPOI 操作EXCEL核心类库
2.NPOI.Extend NPOI扩展功能
3. ExcelReport 基于NPOI的二次扩展，实现模板化导出功能
4. System.Windows.Forms 导出或导入时，弹出文件选择对话框（如果用在WEB中可以不需要，但我这里以CS端为主）
3.使用环境准备：
1.通过NUGet引用NPOI包、ExcelReport 包；（ExcelReport 存在BUG,可能需要用我项目中修得过后的DLL）
2.引用ExcelUtility类库；
4 .具体使用方法介绍（示例代码 ，全部为测试方法 ）：
导出方法测试：
/// <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：
/// <summary> /// 测试方法：测试将DataTable导出到EXCEL，无模板，且指定导出的列名 /// </summary> [TestMethod] public void TestExportToExcelByDataTable2() { DataTable dt = GetDataTable(); string[] expColNames = { "Col1", "Col2", "Col3", "Col4", "Col5" }; string excelPath = ExcelUtility.Export.ToExcel(dt, "导出结果", null, expColNames); Assert.IsTrue(File.Exists(excelPath)); } 结果如下图示：
/// <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" }; Dictionary<string, string> expColAsNames = new Dictionary<string, string>() { {"Col1","列一"}, {"Col2","列二"}, {"Col3","列三"}, {"Col4","列四"}, {"Col5","列五"} }; string excelPath = ExcelUtility.Export.ToExcel(dt, "导出结果", null, expColNames,expColAsNames); Assert.IsTrue(File.Exists(excelPath)); } 结果如下图示：
/// <summary> /// 测试方法：测试将DataTable导出到EXCEL，无模板，且指定导出列名的重命名 /// </summary> [TestMethod] public void TestExportToExcelByDataTable4() { DataTable dt = GetDataTable(); Dictionary<string, string> expColAsNames = new Dictionary<string, string>() { {"Col1","列一"}, {"Col5","列五"} }; string excelPath = ExcelUtility.Export.ToExcel(dt, "导出结果", null, null, expColAsNames); Assert.IsTrue(File.Exists(excelPath)); } 结果如下图示：
/// <summary> /// 测试方法：测试依据模板+DataTable来生成EXCEL /// </summary> [TestMethod] public void TestExportToExcelWithTemplateByDataTable() { DataTable dt = GetDataTable();//获取数据 string templateFilePath = AppDomain.CurrentDomain.BaseDirectory + "/excel.xlsx"; //获得EXCEL模板路径 SheetFormatterContainer<DataRow> formatterContainers = new SheetFormatterContainer<DataRow>(); //实例化一个模板数据格式化容器 PartFormatterBuilder partFormatterBuilder = new PartFormatterBuilder();//实例化一个局部元素格式化器 partFormatterBuilder.AddFormatter("Title", "跨越IT学员");//将模板表格中Title的值设置为跨越IT学员 formatterContainers.AppendFormatterBuilder(partFormatterBuilder);//添加到工作薄格式容器中，注意只有添加进去了才会生效 CellFormatterBuilder cellFormatterBuilder = new CellFormatterBuilder();//实例化一个单元格格式化器 cellFormatterBuilder.AddFormatter("rptdate", DateTime.Today.ToString("yyyy-MM-dd HH:mm"));//将模板表格中rptdate的值设置为当前日期 formatterContainers.AppendFormatterBuilder(cellFormatterBuilder);//添加到工作薄格式容器中，注意只有添加进去了才会生效 //实例化一个表格格式化器，dt.Select()是将DataTable转换成DataRow[]，name表示的模板表格中第一行第一个单元格要填充的数据参数名 TableFormatterBuilder<DataRow> tableFormatterBuilder = new TableFormatterBuilder<DataRow>(dt.Select(), "name"); tableFormatterBuilder.AddFormatters(new Dictionary<string, Func<DataRow, object>>{ {"name",r=>r["Col1"]},//将模板表格中name对应DataTable中的列Col1 {"sex",r=>r["Col2"]},//将模板表格中sex对应DataTable中的列Col2 {"km",r=>r["Col3"]},//将模板表格中km对应DataTable中的列Col3 {"score",r=>r["Col4"]},//将模板表格中score对应DataTable中的列Col {"result",r=>r["Col5"]}//将模板表格中result对应DataTable中的列Co5 }); formatterContainers.AppendFormatterBuilder(tableFormatterBuilder);//添加到工作薄格式容器中，注意只有添加进去了才会生效 string excelPath = ExcelUtility.Export.ToExcelWithTemplate<DataRow>(templateFilePath, "table", formatterContainers); Assert.IsTrue(File.Exists(excelPath)); } 模板如下图示：
结果如下图示：
/// <summary> /// 测试方法：测试依据模板+List来生成EXCEL /// </summary> [TestMethod] public void TestExportToExcelWithTemplateByList() { List<Student> studentList = GetStudentList();//获取数据 string templateFilePath = AppDomain.CurrentDomain.BaseDirectory + "/excel.xlsx"; //获得EXCEL模板路径 SheetFormatterContainer<Student> formatterContainers = new SheetFormatterContainer<Student>(); //实例化一个模板数据格式化容器 PartFormatterBuilder partFormatterBuilder = new PartFormatterBuilder();//实例化一个局部元素格式化器 partFormatterBuilder.AddFormatter("Title", "跨越IT学员");//将模板表格中Title的值设置为跨越IT学员 formatterContainers.AppendFormatterBuilder(partFormatterBuilder);//添加到工作薄格式容器中，注意只有添加进去了才会生效 CellFormatterBuilder cellFormatterBuilder = new CellFormatterBuilder();//实例化一个单元格格式化器 cellFormatterBuilder.AddFormatter("rptdate", DateTime.Today.ToString("yyyy-MM-dd HH:mm"));//将模板表格中rptdate的值设置为当前日期 formatterContainers.AppendFormatterBuilder(cellFormatterBuilder);//添加到工作薄格式容器中，注意只有添加进去了才会生效 //实例化一个表格格式化器，studentList本身就是可枚举的无需转换，name表示的模板表格中第一行第一个单元格要填充的数据参数名 TableFormatterBuilder<Student> tableFormatterBuilder = new TableFormatterBuilder<Student>(studentList, "name"); tableFormatterBuilder.AddFormatters(new Dictionary<string, Func<Student, object>>{ {"name",r=>r.Name},//将模板表格中name对应Student对象中的属性Name {"sex",r=>r.Sex},//将模板表格中sex对应Student对象中的属性Sex {"km",r=>r.KM},//将模板表格中km对应Student对象中的属性KM {"score",r=>r.Score},//将模板表格中score对应Student对象中的属性Score {"result",r=>r.Result}//将模板表格中result对应Student对象中的属性Result }); formatterContainers.AppendFormatterBuilder(tableFormatterBuilder); string excelPath = ExcelUtility.Export.ToExcelWithTemplate<Student>(templateFilePath, "table", formatterContainers); Assert.IsTrue(File.Exists(excelPath)); } 结果如下图示：（模板与上面相同）
/// <summary> /// 测试方法：测试依据模板+DataTable来生成多表格EXCEL（注意：由于NPOI框架限制，目前仅支持模板文件格式为：xls） /// </summary> [TestMethod] public void TestExportToRepeaterExcelWithTemplateByDataTable() { DataTable dt = GetDataTable();//获取数据 string templateFilePath = AppDomain.CurrentDomain.BaseDirectory + "/excel2.xls"; //获得EXCEL模板路径 SheetFormatterContainer<DataRow> formatterContainers = new SheetFormatterContainer<DataRow>(); //实例化一个模板数据格式化容器 //实例化一个可重复表格格式化器，dt.Select()是将DataTable转换成DataRow[]，rpt_begin表示的模板表格开始位置参数名，rpt_end表示的模板表格结束位置参数名 RepeaterFormatterBuilder<DataRow> tableFormatterBuilder = new RepeaterFormatterBuilder<DataRow>(dt.Select(), "rpt_begin", "rpt_end"); tableFormatterBuilder.AddFormatters(new Dictionary<string, Func<DataRow, object>>{ {"sex",r=>r["Col2"]},//将模板表格中sex对应DataTable中的列Col2 {"km",r=>r["Col3"]},//将模板表格中km对应DataTable中的列Col3 {"score",r=>r["Col4"]},//将模板表格中score对应DataTable中的列Col {"result",r=>r["Col5"]}//将模板表格中result对应DataTable中的列Co5 }); PartFormatterBuilder<DataRow> partFormatterBuilder2 = new PartFormatterBuilder<DataRow>();//实例化一个可嵌套的局部元素格式化器 partFormatterBuilder2.AddFormatter("name", r => r["Col1"]);//将模板表格中name对应DataTable中的列Col1 tableFormatterBuilder.AppendFormatterBuilder(partFormatterBuilder2);//添加到可重复表格格式化器中，作为其子格式化器 CellFormatterBuilder<DataRow> cellFormatterBuilder = new CellFormatterBuilder<DataRow>();//实例化一个可嵌套的单元格格式化器 cellFormatterBuilder.AddFormatter("rptdate", r => DateTime.Today.ToString("yyyy-MM-dd HH:mm"));//将模板表格中rptdate的值设置为当前日期 tableFormatterBuilder.AppendFormatterBuilder(cellFormatterBuilder);//添加到可重复表格格式化器中，作为其子格式化器 formatterContainers.AppendFormatterBuilder(tableFormatterBuilder);//添加到工作薄格式容器中，注意只有添加进去了才会生效 string excelPath = ExcelUtility.Export.ToExcelWithTemplate<DataRow>(templateFilePath, "multtable", formatterContainers); Assert.IsTrue(File.Exists(excelPath)); } 模板如下图示：（注意：该模板仅支持XLS格式文件，XLSX下存在问题）
结果如下图示：
以下是模拟数据来源所定义的方法（配合测试）：
private DataTable GetDataTable() { DataTable dt = new DataTable(); for (int i = 1; i <= 6; i++) { if (i == 4) { dt.Columns.Add("Col" + i.ToString(), typeof(double)); } else { dt.Columns.Add("Col" + i.ToString(), typeof(string)); } } for (int i = 1; i <= 10; i++) { dt.Rows.Add("Name" + i.ToString(), (i % 2) > 0 ? "男" : "女", "科目" + i.ToString(), i * new Random().Next(1, 5), "待定", Guid.NewGuid().ToString("N")); } return dt; } private List<Student> GetStudentList() { List<Student> studentList = new List<Student>(); for (int i = 1; i <= 10; i++) { studentList.Add(new Student { Name = "Name" + i.ToString(), Sex = (i % 2) > 0 ? "男" : "女", KM = "科目" + i.ToString(), Score = i * new Random().Next(1, 5), Result = "待定" }); } return studentList; } class Student { public string Name { get; set; } public string Sex { get; set; } public string KM { get; set; } public double Score { get; set; } public string Result { get; set; } } 导入方法测试：
/// <summary> /// 测试方法：测试将指定的EXCEL数据导入到DataTable /// </summary> [TestMethod] public void TestImportToDataTableFromExcel() { //null表示由用户选择EXCEL文件路径，data表示要导入的sheet名,0表示数据标题行 DataTable dt= ExcelUtility.Import.ToDataTable(null, "data", 0); Assert.AreNotEqual(0, dt.Rows.Count); } 数据源文件内容如下图示：
下面贴出该类库主要源代码：
ExcelUtility.Export类：
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 { 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); // 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); } // 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.ReSizeColumnWidth(sheet, cell); } rowIndex++; } } 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> /// <returns></returns> public static string ToExcel(DataTable sourceTable, string[] colAliasNames, string sheetName = "result", string filePath = 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); 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); } // 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.ReSizeColumnWidth(sheet, cell); } rowIndex++; } 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> /// <returns></returns> public static string ToExcel(DataGridView grid, string sheetName = "result", string filePath = 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); 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); for (int i = 0; i < grid.Columns.Count; i++) { ICell headerCell = headerRow.CreateCell(i); headerCell.SetCellValue(grid.Columns[i].HeaderText); headerCell.CellStyle = headerCellStyle; sheet.AutoSizeColumn(headerCell.ColumnIndex); } int rowIndex = 1; foreach (DataGridViewRow row in grid.Rows) { IRow dataRow = sheet.CreateRow(rowIndex); for (int n = 0; n < grid.Columns.Count; n++) { ICell cell = dataRow.CreateCell(n); cell.SetCellValue((row.Cells[n].Value ?? "").ToString()); cell.CellStyle = cellStyle; Common.ReSizeColumnWidth(sheet, cell); } rowIndex++; } 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> /// <returns></returns> public static string ToExcel(DataTable sourceTable, string sheetName = "result", string filePath = null, string[] colNames = null, IDictionary<string, string> colAliasNames = 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); 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); } // 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.ReSizeColumnWidth(sheet, cell); } rowIndex++; } 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; } } } ExcelUtility.Import类：
using NPOI.SS.UserModel; using System; using System.Collections.Generic; using System.Data; using System.IO; using System.Linq; using System.Text; using ExcelUtility.Base; namespace ExcelUtility { public sealed class Import { /// <summary> /// 由Excel导入DataTable /// </summary> /// <param name="excelFileStream">Excel文件流</param> /// <param name="sheetName">Excel工作表名称</param> /// <param name="headerRowIndex">Excel表头行索引</param> /// <param name="isCompatible">是否为兼容模式</param> /// <returns>DataTable</returns> public static DataTable ToDataTable(Stream excelFileStream, string sheetName, int headerRowIndex, bool isCompatible) { IWorkbook workbook = Common.CreateWorkbook(isCompatible, excelFileStream); ISheet sheet = null; int sheetIndex = -1; if (int.TryParse(sheetName, out sheetIndex)) { sheet = workbook.GetSheetAt(sheetIndex); } else { sheet = workbook.GetSheet(sheetName); } DataTable table = Common.GetDataTableFromSheet(sheet, headerRowIndex); excelFileStream.Close(); workbook = null; sheet = null; return table; } /// <summary> /// 由Excel导入DataTable /// </summary> /// <param name="excelFilePath">Excel文件路径，为物理路径,可传空值</param> /// <param name="sheetName">Excel工作表名称</param> /// <param name="headerRowIndex">Excel表头行索引</param> /// <returns>DataTable</returns> public static DataTable ToDataTable(string excelFilePath, string sheetName, int headerRowIndex) { if (string.IsNullOrEmpty(excelFilePath)) { excelFilePath = Common.GetOpenFilePath(); } if (string.IsNullOrEmpty(excelFilePath)) { return null; } using (FileStream stream = System.IO.File.OpenRead(excelFilePath)) { bool isCompatible = Common.GetIsCompatible(excelFilePath); return ToDataTable(stream, sheetName, headerRowIndex, isCompatible); } } /// <summary> /// 由Excel导入DataSet，如果有多个工作表，则导入多个DataTable /// </summary> /// <param name="excelFileStream">Excel文件流</param> /// <param name="headerRowIndex">Excel表头行索引</param> /// <param name="isCompatible">是否为兼容模式</param> /// <returns>DataSet</returns> public static DataSet ToDataSet(Stream excelFileStream, int headerRowIndex, bool isCompatible) { DataSet ds = new DataSet(); IWorkbook workbook = Common.CreateWorkbook(isCompatible, excelFileStream); for (int i = 0; i < workbook.NumberOfSheets; i++) { ISheet sheet = workbook.GetSheetAt(i); DataTable table = Common.GetDataTableFromSheet(sheet, headerRowIndex); ds.Tables.Add(table); } excelFileStream.Close(); workbook = null; return ds; } /// <summary> /// 由Excel导入DataSet，如果有多个工作表，则导入多个DataTable /// </summary> /// <param name="excelFilePath">Excel文件路径，为物理路径。可传空值</param> /// <param name="headerRowIndex">Excel表头行索引</param> /// <returns>DataSet</returns> public static DataSet ToDataSet(string excelFilePath, int headerRowIndex) { if (string.IsNullOrEmpty(excelFilePath)) { excelFilePath = Common.GetOpenFilePath(); } if (string.IsNullOrEmpty(excelFilePath)) { return null; } using (FileStream stream = System.IO.File.OpenRead(excelFilePath)) { bool isCompatible = Common.GetIsCompatible(excelFilePath); return ToDataSet(stream, headerRowIndex, isCompatible); } } } } Common类根据单元格内容重新设置列宽ReSizeColumnWidth
/// <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 + 5) * 256; const int maxLength = 255 * 256; if (cellLength > maxLength) { cellLength = maxLength; } int colWidth = sheet.GetColumnWidth(cell.ColumnIndex); if (colWidth < cellLength) { sheet.SetColumnWidth(cell.ColumnIndex, cellLength); } } 注意这个方法中，列宽自动设置最大宽度为255个字符宽度。
/// <summary> /// 创建表格头单元格 /// </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; } 发文时，部份方法代码已经更新了，所以实际效果以GIT项目中的为准。
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
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