免费高效实用的.NET操作Excel组件NPOI（.NET组件介绍之六）
很多的软件项目几乎都包含着对文档的操作，前面已经介绍过两款操作文档的组件，现在介绍一款文档操作的组件NPOI。
NPOI可以生成没有安装在您的服务器上的Microsoft Office套件的Excel报表，并且在后台调用Microsoft Excel ActiveX更有效率;从Office文档中提取文本，以帮助您实现全文索引功能（大多数时候，此功能用于创建搜索引擎）； 从Office文档提取图像； 生成包含公式的Excel工作表。
一.NPOI组件概述：
NPOI是完全免费使用； 涵盖Excel的大多数功能（单元格样式，数据格式，公式等）；支持xls，xlsx，docx；设计为面向接口（看看NPOI.SS命名空间）；支持不仅导出而且导入； .Net 2.0甚至为xlsx和docx（虽然我们也支持.NET 4.0）； 来自世界各地的成功案例；巨大的基本例子；对隔离存储没有依赖。
以上是NPOI的优点，其他一些优点可以不用太在意，估计很多人对“支持xls，xlsx，docx”这一特点感觉有些惊讶，因为在很多人的印象里面NPOI就是对Excel进行相关的操作，但是在这里突然看到了对docx也可以操作，这一特点可能让很多人感到欣喜，因为NPOI的的确确是一个很不错的组件，用过的人都说好，我也不例外。
NPOI的运行要求：VS2010与.NET 4.0运行时；VS2005或VS2008与.NET 2.0运行时（SP1）；vs2003与.NET 1.1；Mono；ASP.NET中的中等信任环境。
二.NPOI核心类和方法解析：
以上是对NPOI的相关背景和使用环境做了一个简单的介绍，接下来我具体的看一下NPOI的一些核心类和方法，由于下载的是DLL文件，还是采用.NET Reflector对DLL文件进行反编译，以此查看源代码。
如果需要具体的了解NPOI可以直接访问：http://npoi.codeplex.com/SourceControl/latest，提供了NPOI的源码和一些demo，由于本溪介绍的重点是NPOI对Excel的操作，所以下面的类和实例主要是对操作Excel的介绍，如果需要对docx的操作，可以具体查看相应的类demo。
1.XSSFWorkbook类CreateSheet():创建表。
public ISheet CreateSheet(string sheetname) { if (sheetname == null) { throw new ArgumentException("sheetName must not be null"); } if (this.ContainsSheet(sheetname, this.sheets.Count)) { throw new ArgumentException("The workbook already contains a sheet of this name"); } if (sheetname.Length > 0x1f) { sheetname = sheetname.Substring(0, 0x1f); } WorkbookUtil.ValidateSheetName(sheetname); CT_Sheet sheet = this.AddSheet(sheetname); int index = 1; foreach (XSSFSheet sheet2 in this.sheets) { index = (int) Math.Max((long) (sheet2.sheet.sheetId + 1), (long) index); } Label_0099: foreach (XSSFSheet sheet3 in this.sheets) { index = (int) Math.Max((long) (sheet3.sheet.sheetId + 1), (long) index); } string fileName = XSSFRelation.WORKSHEET.GetFileName(index); foreach (POIXMLDocumentPart part in base.GetRelations()) { if ((part.GetPackagePart() != null) && fileName.Equals(part.GetPackagePart().PartName.Name)) { index++; goto Label_0099; } } XSSFSheet item = (XSSFSheet) base.CreateRelationship(XSSFRelation.WORKSHEET, XSSFFactory.GetInstance(), index); item.sheet = sheet; sheet.id = item.GetPackageRelationship().Id; sheet.sheetId = (uint) index; if (this.sheets.Count == 0) { item.IsSelected = true; } this.sheets.Add(item); return item; }
2.XSSFSheet类Write():将文件流写入到excel。
internal virtual void Write(Stream stream) { bool flag = false; if (this.worksheet.sizeOfColsArray() == 1) { CT_Cols colsArray = this.worksheet.GetColsArray(0); if (colsArray.sizeOfColArray() == 0) { flag = true; this.worksheet.SetColsArray(null); } else { this.SetColWidthAttribute(colsArray); } } if (this.hyperlinks.Count > 0) { if (this.worksheet.hyperlinks == null) { this.worksheet.AddNewHyperlinks(); } CT_Hyperlink[] array = new CT_Hyperlink[this.hyperlinks.Count]; for (int i = 0; i < array.Length; i++) { XSSFHyperlink hyperlink = this.hyperlinks[i]; hyperlink.GenerateRelationIfNeeded(base.GetPackagePart()); array[i] = hyperlink.GetCTHyperlink(); } this.worksheet.hyperlinks.SetHyperlinkArray(array); } foreach (XSSFRow row in this._rows.Values) { row.OnDocumentWrite(); } Dictionary<string, string> dictionary = new Dictionary<string, string>(); dictionary[ST_RelationshipId.NamespaceURI] = "r"; new WorksheetDocument(this.worksheet).Save(stream); if (flag) { this.worksheet.AddNewCols(); } }
3.XSSFSheet类CreateRow()：创建行。
public virtual IRow CreateRow(int rownum) { CT_Row cTRow; XSSFRow row2 = this._rows.ContainsKey(rownum) ? this._rows[rownum] : null; if (row2 != null) { cTRow = row2.GetCTRow(); cTRow.Set(new CT_Row()); } else if ((this._rows.Count == 0) || (rownum > this.GetLastKey(this._rows.Keys))) { cTRow = this.worksheet.sheetData.AddNewRow(); } else { int count = this.HeadMap(this._rows, rownum).Count; cTRow = this.worksheet.sheetData.InsertNewRow(count); } XSSFRow row3 = new XSSFRow(cTRow, this) { RowNum = rownum }; this._rows[rownum] = row3; return row3; }
4.XSSFWorkbook类GetSheet：获取表。
public ISheet GetSheet(string name) { foreach (XSSFSheet sheet in this.sheets) { if (name.Equals(sheet.SheetName, StringComparison.InvariantCultureIgnoreCase)) { return sheet; } } return null; }
5.WorkbookFactory类：
public class PropertySetFactory { public static PropertySet Create(DirectoryEntry dir, string name); public static PropertySet Create(Stream stream); public static SummaryInformation CreateSummaryInformation(); public static DocumentSummaryInformation CreateDocumentSummaryInformation(); }
6.DocumentSummaryInformation：
[Serializable] public class DocumentSummaryInformation : SpecialPropertySet { // Fields public const string DEFAULT_STREAM_NAME = "\x0005DocumentSummaryInformation"; // Methods public DocumentSummaryInformation(PropertySet ps); private void EnsureSection2(); public void RemoveByteCount(); public void RemoveCategory(); public void RemoveCompany(); public void RemoveCustomProperties(); public void RemoveDocparts(); public void RemoveHeadingPair(); public void RemoveHiddenCount(); public void RemoveLineCount(); public void RemoveLinksDirty(); public void RemoveManager(); public void RemoveMMClipCount(); public void RemoveNoteCount(); public void RemoveParCount(); public void RemovePresentationFormat(); public void RemoveScale(); public void RemoveSlideCount(); // Properties public int ByteCount { get; set; } public string Category { get; set; } public string Company { get; set; } public CustomProperties CustomProperties { get; set; } public byte[] Docparts { get; set; } public byte[] HeadingPair { get; set; } public int HiddenCount { get; set; } public int LineCount { get; set; } public bool LinksDirty { get; set; } public string Manager { get; set; } public int MMClipCount { get; set; } public int NoteCount { get; set; } public int ParCount { get; set; } public string PresentationFormat { get; set; } public override PropertyIDMap PropertySetIDMap { get; } public bool Scale { get; set; } public int SlideCount { get; set; } } 具体方法： private void EnsureSection2() { if (this.SectionCount < 2) { MutableSection section = new MutableSection(); section.SetFormatID(SectionIDMap.DOCUMENT_SUMMARY_INFORMATION_ID2); this.AddSection(section); } }
以上只是对部分的类和方法做了简单的说明，需要了解更多的内容，可以进入官网下载源码，或者使用软件查看DLL文件。
三.NPOI操作实例：
1.枚举(Excel单元格数据类型)：
/// <summary> /// 枚举(Excel单元格数据类型) /// </summary> public enum NpoiDataType { /// <summary> /// 字符串类型-值为1 /// </summary> String, /// <summary> /// 布尔类型-值为2 /// </summary> Bool, /// <summary> /// 时间类型-值为3 /// </summary> Datetime, /// <summary> /// 数字类型-值为4 /// </summary> Numeric, /// <summary> /// 复杂文本类型-值为5 /// </summary> Richtext, /// <summary> /// 空白 /// </summary> Blank, /// <summary> /// 错误 /// </summary> Error }
2. 将DataTable数据导入到excel中：
/// <summary> /// 将DataTable数据导入到excel中 /// </summary> /// <param name="data">要导入的数据</param> /// <param name="isColumnWritten">DataTable的列名是否要导入</param> /// <param name="sheetName">要导入的excel的sheet的名称</param> /// <param name="fileName">文件夹路径</param> /// <returns>导入数据行数(包含列名那一行)</returns> public static int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten, string fileName) { if (data == null) { throw new ArgumentNullException("data"); } if (string.IsNullOrEmpty(sheetName)) { throw new ArgumentNullException(sheetName); } if (string.IsNullOrEmpty(fileName)) { throw new ArgumentNullException(fileName); } IWorkbook workbook = null; if (fileName.IndexOf(".xlsx", StringComparison.Ordinal) > 0) { workbook = new XSSFWorkbook(); } else if (fileName.IndexOf(".xls", StringComparison.Ordinal) > 0) { workbook = new HSSFWorkbook(); } FileStream fs = null; try { fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite); ISheet sheet; if (workbook != null) { sheet = workbook.CreateSheet(sheetName); } else { return -1; } int j; int count; //写入DataTable的列名，写入单元格中 if (isColumnWritten) { var row = sheet.CreateRow(0); for (j = 0; j < data.Columns.Count; ++j) { row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName); } count = 1; } else { count = 0; } //遍历循环datatable具体数据项 int i; for (i = 0; i < data.Rows.Count; ++i) { var row = sheet.CreateRow(count); for (j = 0; j < data.Columns.Count; ++j) { row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString()); } ++count; } //将文件流写入到excel workbook.Write(fs); return count; } catch (IOException ioex) { throw new IOException(ioex.Message); } catch (Exception ex) { throw new Exception(ex.Message); } finally { if (fs != null) { fs.Close(); } } }
3.将excel中的数据导入到DataTable中：
/// <summary> /// 将excel中的数据导入到DataTable中 /// </summary> /// <param name="sheetName">excel工作薄sheet的名称</param> /// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param> /// <param name="fileName">文件路径</param> /// <returns>返回的DataTable</returns> public static DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn, string fileName) { if (string.IsNullOrEmpty(sheetName)) { throw new ArgumentNullException(sheetName); } if (string.IsNullOrEmpty(fileName)) { throw new ArgumentNullException(fileName); } var data = new DataTable(); IWorkbook workbook = null; FileStream fs = null; try { fs = new FileStream(fileName, FileMode.Open, FileAccess.Read); if (fileName.IndexOf(".xlsx", StringComparison.Ordinal) > 0) { workbook = new XSSFWorkbook(fs); } else if (fileName.IndexOf(".xls", StringComparison.Ordinal) > 0) { workbook = new HSSFWorkbook(fs); } ISheet sheet = null; if (workbook != null) { //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet sheet = workbook.GetSheet(sheetName) ?? workbook.GetSheetAt(0); } if (sheet == null) return data; var firstRow = sheet.GetRow(0); //一行最后一个cell的编号 即总的列数 int cellCount = firstRow.LastCellNum; int startRow; if (isFirstRowColumn) { for (int i = firstRow.FirstCellNum; i < cellCount; ++i) { var cell = firstRow.GetCell(i); var cellValue = cell.StringCellValue; if (cellValue == null) continue; var column = new DataColumn(cellValue); data.Columns.Add(column); } startRow = sheet.FirstRowNum + 1; } else { startRow = sheet.FirstRowNum; } //最后一列的标号 var rowCount = sheet.LastRowNum; for (var i = startRow; i <= rowCount; ++i) { var row = sheet.GetRow(i); //没有数据的行默认是null if (row == null) continue; var dataRow = data.NewRow(); for (int j = row.FirstCellNum; j < cellCount; ++j) { //同理，没有数据的单元格都默认是null if (row.GetCell(j) != null) dataRow[j] = row.GetCell(j).ToString(); } data.Rows.Add(dataRow); } return data; } catch (IOException ioex) { throw new IOException(ioex.Message); } catch (Exception ex) { throw new Exception(ex.Message); } finally { if (fs != null) { fs.Close(); } } }
4.读取Excel文件内容转换为DataSet：
/// <summary> /// 读取Excel文件内容转换为DataSet,列名依次为 "c0"……c[columnlength-1] /// </summary> /// <param name="fileName">文件绝对路径</param> /// <param name="startRow">数据开始行数(1为第一行)</param> /// <param name="columnDataType">每列的数据类型</param> /// <returns></returns> public static DataSet ReadExcel(string fileName, int startRow, params NpoiDataType[] columnDataType) { var ds = new DataSet("ds"); var dt = new DataTable("dt"); var sb = new StringBuilder(); using (var stream = new FileStream(fileName, FileMode.Open, FileAccess.Read)) { //使用接口，自动识别excel2003/2007格式 var workbook = WorkbookFactory.Create(stream); //得到里面第一个sheet var sheet = workbook.GetSheetAt(0); int j; IRow row; //ColumnDataType赋值 if (columnDataType.Length <= 0) { //得到第i行 row = sheet.GetRow(startRow - 1); columnDataType = new NpoiDataType[row.LastCellNum]; for (var i = 0; i < row.LastCellNum; i++) { var hs = row.GetCell(i); columnDataType[i] = GetCellDataType(hs); } } for (j = 0; j < columnDataType.Length; j++) { var tp = GetDataTableType(columnDataType[j]); dt.Columns.Add("c" + j, tp); } for (var i = startRow - 1; i <= sheet.PhysicalNumberOfRows; i++) { //得到第i行 row = sheet.GetRow(i); if (row == null) continue; try { var dr = dt.NewRow(); for (j = 0; j < columnDataType.Length; j++) { dr["c" + j] = GetCellData(columnDataType[j], row, j); } dt.Rows.Add(dr); } catch (Exception er) { sb.Append(string.Format("第{0}行出错：{1}\r\n", i + 1, er.Message)); } } ds.Tables.Add(dt); } if (ds.Tables[0].Rows.Count == 0 && sb.ToString() != "") throw new Exception(sb.ToString()); return ds; }
5.从DataSet导出到2003：
/// <summary> /// 从DataSet导出到MemoryStream流2003 /// </summary> /// <param name="saveFileName">文件保存路径</param> /// <param name="sheetName">Excel文件中的Sheet名称</param> /// <param name="ds">存储数据的DataSet</param> /// <param name="startRow">从哪一行开始写入，从0开始</param> /// <param name="datatypes">DataSet中的各列对应的数据类型</param> public static bool CreateExcel2003(string saveFileName, string sheetName, DataSet ds, int startRow, params NpoiDataType[] datatypes) { try { if (startRow < 0) startRow = 0; var wb = new HSSFWorkbook(); var dsi = PropertySetFactory.CreateDocumentSummaryInformation(); dsi.Company = "pkm"; var si = PropertySetFactory.CreateSummaryInformation(); si.Title = si.Subject = "automatic genereted document"; si.Author = "pkm"; wb.DocumentSummaryInformation = dsi; wb.SummaryInformation = si; var sheet = wb.CreateSheet(sheetName); //sheet.SetColumnWidth(0, 50 * 256); //sheet.SetColumnWidth(1, 100 * 256); ICell cell; int j; var maxLength = 0; var curLength = 0; object columnValue; var dt = ds.Tables[0]; if (datatypes.Length < dt.Columns.Count) { datatypes = new NpoiDataType[dt.Columns.Count]; for (var i = 0; i < dt.Columns.Count; i++) { var dtcolumntype = dt.Columns[i].DataType.Name.ToLower(); switch (dtcolumntype) { case "string": datatypes[i] = NpoiDataType.String; break; case "datetime": datatypes[i] = NpoiDataType.Datetime; break; case "boolean": datatypes[i] = NpoiDataType.Bool; break; case "double": datatypes[i] = NpoiDataType.Numeric; break; default: datatypes[i] = NpoiDataType.String; break; } } } // 创建表头 var row = sheet.CreateRow(0); //样式 var style1 = wb.CreateCellStyle(); //字体 var font1 = wb.CreateFont(); //字体颜色 font1.Color = HSSFColor.White.Index; //字体加粗样式 font1.Boldweight = (short)FontBoldWeight.Bold; //style1.FillBackgroundColor = HSSFColor.WHITE.index; style1.FillForegroundColor = HSSFColor.Green.Index; //GetXLColour(wb, LevelOneColor);// 设置图案色 //GetXLColour(wb, LevelOneColor);// 设置背景色 style1.FillPattern = FillPattern.SolidForeground; //样式里的字体设置具体的字体样式 style1.SetFont(font1); //文字水平对齐方式 style1.Alignment = HorizontalAlignment.Center; //文字垂直对齐方式 style1.VerticalAlignment = VerticalAlignment.Center; row.HeightInPoints = 25; for (j = 0; j < dt.Columns.Count; j++) { columnValue = dt.Columns[j].ColumnName; curLength = Encoding.Default.GetByteCount(columnValue.ToString()); maxLength = (maxLength < curLength ? curLength : maxLength); var colounwidth = 256 * maxLength; sheet.SetColumnWidth(j, colounwidth); try { //创建第0行的第j列 cell = row.CreateCell(j); //单元格式设置样式 cell.CellStyle = style1; try { cell.SetCellType(CellType.String); cell.SetCellValue(columnValue.ToString()); } catch (Exception ex) { throw new Exception(ex.Message); } } catch (Exception ex) { throw new Exception(ex.Message); } } // 创建每一行 for (var i = startRow; i < ds.Tables[0].Rows.Count; i++) { var dr = ds.Tables[0].Rows[i]; //创建第i行 row = sheet.CreateRow(i + 1); for (j = 0; j < dt.Columns.Count; j++) { columnValue = dr[j]; curLength = Encoding.Default.GetByteCount(columnValue.ToString()); maxLength = (maxLength < curLength ? curLength : maxLength); var colounwidth = 256 * maxLength; sheet.SetColumnWidth(j, colounwidth); try { //创建第i行的第j列 cell = row.CreateCell(j); // 插入第j列的数据 try { var dtype = datatypes[j]; switch (dtype) { case NpoiDataType.String: { cell.SetCellType(CellType.Numeric); cell.SetCellValue(columnValue.ToString()); } break; case NpoiDataType.Datetime: { cell.SetCellType(CellType.Numeric); cell.SetCellValue(columnValue.ToString()); } break; case NpoiDataType.Numeric: { cell.SetCellType(CellType.Numeric); cell.SetCellValue(Convert.ToDouble(columnValue)); } break; case NpoiDataType.Bool: { cell.SetCellType(CellType.Numeric); cell.SetCellValue(Convert.ToBoolean(columnValue)); } break; case NpoiDataType.Richtext: { cell.SetCellType(CellType.Numeric); cell.SetCellValue(columnValue.ToString()); } break; } } catch (Exception ex) { cell.SetCellType(CellType.Numeric); cell.SetCellValue(columnValue.ToString()); throw new Exception(ex.Message); } } catch (Exception ex) { throw new Exception(ex.Message); } } } //生成文件在服务器上 using (var fs = new FileStream(saveFileName, FileMode.OpenOrCreate, FileAccess.Write)) { wb.Write(fs); } return true; } catch (Exception er) { throw new Exception(er.Message); } }
6.从DataSet导出到MemoryStream流2007：
/// <summary> /// 从DataSet导出到MemoryStream流2007 /// </summary> /// <param name="saveFileName">文件保存路径</param> /// <param name="sheetName">Excel文件中的Sheet名称</param> /// <param name="ds">存储数据的DataSet</param> /// <param name="startRow">从哪一行开始写入，从0开始</param> /// <param name="datatypes">DataSet中的各列对应的数据类型</param> public static bool CreateExcel2007(string saveFileName, string sheetName, DataSet ds, int startRow, params NpoiDataType[] datatypes) { try { if (startRow < 0) startRow = 0; var wb = new XSSFWorkbook(); var sheet = wb.CreateSheet(sheetName); ICell cell; int j; var maxLength = 0; int curLength; object columnValue; var dt = ds.Tables[0]; if (datatypes.Length < dt.Columns.Count) { datatypes = new NpoiDataType[dt.Columns.Count]; for (var i = 0; i < dt.Columns.Count; i++) { var dtcolumntype = dt.Columns[i].DataType.Name.ToLower(); switch (dtcolumntype) { case "string": datatypes[i] = NpoiDataType.String; break; case "datetime": datatypes[i] = NpoiDataType.Datetime; break; case "boolean": datatypes[i] = NpoiDataType.Bool; break; case "double": datatypes[i] = NpoiDataType.Numeric; break; default: datatypes[i] = NpoiDataType.String; break; } } } //创建表头 var row = sheet.CreateRow(0); //样式 var style1 = wb.CreateCellStyle(); //字体 var font1 = wb.CreateFont(); //字体颜色 font1.Color = HSSFColor.White.Index; //字体加粗样式 font1.Boldweight = (short)FontBoldWeight.Bold; //style1.FillBackgroundColor = HSSFColor.WHITE.index; //GetXLColour(wb, LevelOneColor); // 设置图案色 style1.FillForegroundColor = HSSFColor.Green.Index; //GetXLColour(wb, LevelOneColor);// 设置背景色 style1.FillPattern = FillPattern.SolidForeground; //样式里的字体设置具体的字体样式 style1.SetFont(font1); //文字水平对齐方式 style1.Alignment = HorizontalAlignment.Center; //文字垂直对齐方式 style1.VerticalAlignment = VerticalAlignment.Center; row.HeightInPoints = 25; for (j = 0; j < dt.Columns.Count; j++) { columnValue = dt.Columns[j].ColumnName; curLength = Encoding.Default.GetByteCount(columnValue.ToString()); maxLength = (maxLength < curLength ? curLength : maxLength); var colounwidth = 256 * maxLength; sheet.SetColumnWidth(j, colounwidth); try { //创建第0行的第j列 cell = row.CreateCell(j); //单元格式设置样式 cell.CellStyle = style1; try { cell.SetCellValue(columnValue.ToString()); } catch (Exception ex) { throw new Exception(ex.Message); } } catch (Exception ex) { throw new Exception(ex.Message); } } // 创建每一行 for (var i = startRow; i < ds.Tables[0].Rows.Count; i++) { var dr = ds.Tables[0].Rows[i]; //创建第i行 row = sheet.CreateRow(i + 1); for (j = 0; j < dt.Columns.Count; j++) { columnValue = dr[j]; curLength = Encoding.Default.GetByteCount(columnValue.ToString()); maxLength = (maxLength < curLength ? curLength : maxLength); var colounwidth = 256 * maxLength; sheet.SetColumnWidth(j, colounwidth); try { //创建第i行的第j列 cell = row.CreateCell(j); // 插入第j列的数据 try { var dtype = datatypes[j]; switch (dtype) { case NpoiDataType.String: { cell.SetCellValue(columnValue.ToString()); } break; case NpoiDataType.Datetime: { cell.SetCellValue(columnValue.ToString()); } break; case NpoiDataType.Numeric: { cell.SetCellValue(Convert.ToDouble(columnValue)); } break; case NpoiDataType.Bool: { cell.SetCellValue(Convert.ToBoolean(columnValue)); } break; case NpoiDataType.Richtext: { cell.SetCellValue(columnValue.ToString()); } break; } } catch (Exception ex) { cell.SetCellValue(columnValue.ToString()); throw new Exception(ex.Message); } } catch (Exception ex) { throw new Exception(ex.Message); } } } //生成文件在服务器上 using (var fs = new FileStream(saveFileName, FileMode.OpenOrCreate, FileAccess.Write)) { wb.Write(fs); } return true; } catch (Exception er) { throw new Exception(er.Message); } }
7.读Excel-根据NpoiDataType创建的DataTable列的数据类型：
/// <summary> /// 读Excel-根据NpoiDataType创建的DataTable列的数据类型 /// </summary> /// <param name="datatype"></param> /// <returns></returns> private static Type GetDataTableType(NpoiDataType datatype) { var tp = typeof(string); switch (datatype) { case NpoiDataType.Bool: tp = typeof(bool); break; case NpoiDataType.Datetime: tp = typeof(DateTime); break; case NpoiDataType.Numeric: tp = typeof(double); break; case NpoiDataType.Error: tp = typeof(string); break; case NpoiDataType.Blank: tp = typeof(string); break; } return tp; } /// <summary> /// 读Excel-得到不同数据类型单元格的数据 /// </summary> /// <param name="datatype">数据类型</param> /// <param name="row">数据中的一行</param> /// <param name="column">哪列</param> /// <returns></returns> private static object GetCellData(NpoiDataType datatype, IRow row, int column) { switch (datatype) { case NpoiDataType.String: try { return row.GetCell(column).DateCellValue; } catch { try { return row.GetCell(column).StringCellValue; } catch { return row.GetCell(column).NumericCellValue; } } case NpoiDataType.Bool: try { return row.GetCell(column).BooleanCellValue; } catch { return row.GetCell(column).StringCellValue; } case NpoiDataType.Datetime: try { return row.GetCell(column).DateCellValue; } catch { return row.GetCell(column).StringCellValue; } case NpoiDataType.Numeric: try { return row.GetCell(column).NumericCellValue; } catch { return row.GetCell(column).StringCellValue; } case NpoiDataType.Richtext: try { return row.GetCell(column).RichStringCellValue; } catch { return row.GetCell(column).StringCellValue; } case NpoiDataType.Error: try { return row.GetCell(column).ErrorCellValue; } catch { return row.GetCell(column).StringCellValue; } case NpoiDataType.Blank: try { return row.GetCell(column).StringCellValue; } catch { return ""; } default: return ""; } } /// <summary> /// 获取单元格数据类型 /// </summary> /// <param name="hs">单元格对象</param> /// <returns></returns> private static NpoiDataType GetCellDataType(ICell hs) { NpoiDataType dtype; DateTime t1; var cellvalue = ""; switch (hs.CellType) { case CellType.Blank: dtype = NpoiDataType.String; cellvalue = hs.StringCellValue; break; case CellType.Boolean: dtype = NpoiDataType.Bool; break; case CellType.Numeric: dtype = NpoiDataType.Numeric; cellvalue = hs.NumericCellValue.ToString(CultureInfo.InvariantCulture); break; case CellType.String: dtype = NpoiDataType.String; cellvalue = hs.StringCellValue; break; case CellType.Error: dtype = NpoiDataType.Error; break; default: dtype = NpoiDataType.Datetime; break; } if (cellvalue != "" && DateTime.TryParse(cellvalue, out t1)) dtype = NpoiDataType.Datetime; return dtype; }
四.总结：
本文是接着上五篇介绍.NET组件，目的只是在于总结一些组件的用法，将文章作为一个引子，各位读者可以根据文章的介绍更加深入的去了解相关组件。有些地方写的有误，还望多多包涵和指正，欢迎大家给我建议介绍一些你们在项目中经常使用的组件，可以跟大家做一个分享。
.NET组件介绍系列：
一款开源免费的.NET文档操作组件DocX（.NET组件介绍之一）http://www.cnblogs.com/pengze0902/p/6122311.html
高效而稳定的企业级.NET Office 组件Spire（.NET组件介绍之二）http://www.cnblogs.com/pengze0902/p/6125570.html
最好的.NET开源免费ZIP库DotNetZip（.NET组件介绍之三）http://www.cnblogs.com/pengze0902/p/6124659.html
免费开源的DotNet二维码操作组件ThoughtWorks.QRCode（.NET组件介绍之四）http://www.cnblogs.com/pengze0902/p/6134506.html
免费开源的DotNet任务调度组件Quartz.NET（.NET组件介绍之五）http://www.cnblogs.com/pengze0902/p/6128558.html
免费高效实用的Excel操作组件NPOI（.NET组件介绍之六）http://www.cnblogs.com/pengze0902/p/6150070.html
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