npoi

什么是NPOI ? 　　简而言之，NPOI就是可以在没有Office的情况下对Word或Excel文档进行读写等操作。 使用方式 : 　　 1、准备NPOI的dll文件 　　　　下载链接： https://npoi.codeplex.com/releases 　　2、将下载的dll文件引入项目中 　　3、引用命名空间 须知： 　　1、Excel表格分为：WorkBook（工作薄）-> Sheet（工作表） -> 行：Row 单元格：Cell。 　　2、NPOI是POI的C#版本，NPOI的行和列的index都是从0开始 代码如下： 1 　　　 /// <summary> 2 /// 将DataTable导入到Excel 3 /// </summary> 4 /// <param name="data">要导入的数据</param> 5 /// <param name="filepath">导入的文件路径（包含文件名称）</param> 6 /// <param name="sheename">要导入的表名</param> 7 /// <param name="iscolumwrite">是否写入列名</param> 8 /// <returns>导入Excel的行数</returns> 9 public int DataTableToExcel(DataTable data,

　　一、下载NPOI类库 　　　　使用Nuget在线搜索NPOI，下载安装 　　二、代码开撸 　　　　 var workBook = new HSSFWorkbook(); #region 设置样式 IFont font = workBook.CreateFont(); font.FontHeightInPoints = 11; font.FontName = "宋体"; font.Boldweight = (short)FontBoldWeight.Bold; font.Color = HSSFColor.White.Index; HSSFPalette palette = workBook.GetCustomPalette(); //调色板实例 palette.SetColorAtIndex((short)8, (byte)91, (byte)155, (byte)213);//设置表头背景色 palette.SetColorAtIndex((short)16, (byte)221, (byte)235, (byte)247);//设置内容背景色 palette.SetColorAtIndex((short)32, (byte)155, (byte)194, (byte)230);//设置下边框线颜色 palette.SetColorAtIndex((short)48,

1 public class ExcelOperator 2 { 3 public static List<DataTable> Read(string fileName) 4 { 5 List<DataTable> tables = new List<DataTable>(); 6 if (!File.Exists(fileName)) 7 return tables; 8 var fs = new FileStream(fileName, FileMode.Open, FileAccess.Read); 9 IWorkbook workbook = null; 10 if (fileName.IndexOf(".xlsx") > 0) 11 { 12 // 2007版本 13 workbook = new XSSFWorkbook(fs); 14 } 15 else if (fileName.IndexOf(".xls") > 0) 16 { 17 // 2003版本 18 workbook = new HSSFWorkbook(fs); 19 } 20 21 var workbooks = workbook.GetEnumerator(); 22 while (workbooks.MoveNext()) 23 { 24 ISheet sheet = workbooks

npoi完整代码： NET npoi帮助类 public static void DataTableToExcel(List<DataTable> dataTables, string filePath) { if (dataTables == null || !dataTables.Any()) throw new Exception("dataTables不能为null"); bool isOldThan2007 = Path.GetExtension(filePath)?.ToLower() == ".xls"; IWorkbook book = dataTables.ToWorkbook(isOldThan2007); using (FileStream fs = new FileStream(filePath, FileMode.Create, FileAccess.Write)) { book.Write(fs); } } public static IWorkbook ToWorkbook(this List<DataTable> dataTables, bool isOldThan2007) { IWorkbook book = isOldThan2007 ? new HSSFWorkbook() : (IWorkbook)new XSSFWorkbook();

I am creating an excel, when i write some values example 1-19, when I open the excel doc, i see 1-19, but if i click on it then excel tries to format it as a date IS THERE A WAY to force the sheet to not use any formulas or formatting? I have checked and the dataformat is string. private void Test1(ref ISheet worksheet, string[] array, IWorkbook workbook, int iRow, XSSFFont font2) { var format = HSSFDataFormat.GetBuiltinFormats(); ICellStyle _TextCellStyle = workbook.CreateCellStyle(); _TextCellStyle.DataFormat = workbook.CreateDataFormat().GetFormat("@"); IRow file = worksheet.CreateRow(iRow)

I have a project where I am using NPOI to generate Excel document from my Angular application. I have the calls being made from my angular service to my webapi controller as follows: function exportReportToExcel(report) { return $http.post('reportlibrary/exportReport/', report, { }).then(function (response) { return response.data; }); }; Within the controller I make the following call [HttpPost] public HttpResponseMessage ExportReport([FromBody]DTOs.Report report) { try { IReportPersistenceManager manager = ContainerConfigurator.Instance.Resolve<IReportPersistenceManager>(); MemoryStream ms =

I've a excel file in *.xlsx format. I want convert this file into *.xls format in my MVC Web application. In my application hosted server there is no Microsoft.Office package. Please let me know how we can achieve it in NPOI with c#. Thanks in advance. I found the solution based on the Andy's suggestion. Here is the source code which is customized to convert XLSX to XLS. public static class ConvertXLSXToXLS { public static HSSFWorkbook ConvertWorkbookXSSFToHSSF(XSSFWorkbook source) { //Install-Package NPOI -Version 2.0.6 HSSFWorkbook retVal = new HSSFWorkbook(); for (int i = 0; i < source

When I read Excel worksheet using NPOI, empty cells are skipped. For example, it the row contains A, B, , C and I read it using IRow row = sheet.GetRow(rowNb) then row.Cells[1].ToString() will output B (as expected) but row.Cells[2].ToString() will output C instead of an empty string. Is there a way to keep empty cells? Thanks. Try the GetCell method with the MissingCellPolicy : ICell cell = row.GetCell(2, MissingCellPolicy.RETURN_NULL_AND_BLANK); 来源： https://stackoverflow.com/questions/17475359/how-to-use-npoi-to-read-excel-spreadsheet-that-contains-empty-cells