Npoi 操作excel

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using NPOI.HSSF.UserModel; using NPOI.SS.UserModel; using NPOI.SS.Util; using NPOI.XSSF.UserModel; using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace ConsoleApp {       /// <summary>     /// NPOIExcel 针对2.5.1.0出的NPOI操作Excel类的常用方法；     /// </summary>     public class NPOIHelper     {         /// <summary>         /// 记录打开的Excel的路径         /// </summary>         private string npoiFileName;         /// <summary>         /// 工作簿，全局变量         /// </summary>         protected IWorkbook workbook;         /// <summary>         /// 获取工作表或是创建的         /// </summary>         private NPOI.SS.UserModel.ISheet sheet;         /// <summary>         /// 构造方法         /// </summary>         public NPOIHelper()         {             npoiFileName = "";             workbook = new XSSFWorkbook();         }           /// <summary>         /// 打开         /// </summary>         /// <param name="filename">excel文件路径</param>         public void Open(string filename)         {             using (FileStream fileStream = new FileStream(filename, FileMode.Open, FileAccess.Read))             {                 string ext = Path.GetExtension(filename).ToLower();                 if (ext == ".xlsx")                     workbook = new XSSFWorkbook(fileStream);                 else                 {                     workbook = new HSSFWorkbook(fileStream);                 }             }             npoiFileName = filename;         }         /// <summary>         /// 创建一个Excel对象，该对象为可见的         /// </summary>         public void Create(string sheetname = "Sheet1")         {             sheet = workbook.CreateSheet(sheetname);         }           /// <summary>         /// 获取一个工作表         /// </summary>         /// <param name="SheetName">工作表名称</param>         /// <returns></returns>         public ISheet GetSheet(string SheetName)         {             return (sheet = workbook.GetSheet(SheetName) ?? workbook.CreateSheet(SheetName));         }         /// <summary>         /// 添加一个工作表         /// </summary>         /// <param name="SheetName">工作表名称</param>         /// <returns></returns>         public ISheet AddSheet(string SheetName)         {             ISheet s = workbook.CreateSheet(SheetName);             return s;         }         /// <summary>         /// 删除一个工作表         /// </summary>         /// <param name="SheetName">工作表名称</param>         public void DelSheet(string SheetName)         {             int index = workbook.GetNameIndex(SheetName);             workbook.RemoveSheetAt(index);         }         /// <summary>         /// 重命名一个工作表         /// </summary>         /// <param name="OldSheetName">老工作表名称</param>         /// <param name="NewSheetName">新工作表名称</param>         /// <returns></returns>         public ISheet ReNameSheet(string OldSheetName, string NewSheetName)         {             int index = workbook.GetNameIndex(OldSheetName);             workbook.SetSheetName(index, NewSheetName);             return workbook.GetSheetAt(index);         }         /// <summary>         /// 设置单元格的值         /// </summary>         /// <param name="sheetName">工作表名称</param>         /// <param name="row">行</param>         /// <param name="col">列</param>         /// <param name="value">设置的值</param>         private void SetCellValue(ISheet sheetName, int row, int col, object value)         {             IRow _row = sheetName.GetRow(row) ?? sheetName.CreateRow(row);             ICell cell = _row.GetCell(col) ?? _row.CreateCell(col);             string valuetype = value.GetType().Name.ToLower();             switch (valuetype)             {                 case "string"://字符串类型                   case "system.string":                 case "datetime":                 case "system.datetime"://日期类型                  case "boolean"://布尔型                   case "system.boolean"://布尔型                        cell.SetCellType(CellType.String);                     cell.SetCellValue(value.ToString());                     break;                 case "byte":                 case "int":                 case "int16":                 case "int32":                 case "int64":                 case "system.int16"://整型                   case "system.int32":                 case "system.int64":                 case "system.byte":                     cell.SetCellType(CellType.Numeric);                     cell.SetCellValue(Convert.ToInt32(value));                     break;                 case "single":                 case "system.single":                 case "double":                 case "system.double":                 case "decimal":                 case "system.decimal":                     cell.SetCellType(CellType.Numeric);                     cell.SetCellValue(Convert.ToDouble(value));                     break;                 case "dbnull"://空值处理                   case "system.dbnull"://空值处理                       cell.SetCellValue("");                     break;                 default:                     cell.SetCellValue(value.ToString());                     break;             }         }         /// <summary>         /// 要设值的工作表的名称 X行Y列 value 值         /// </summary>         /// <param name="sheetName">工作表名</param>         /// <param name="row">行</param>         /// <param name="col">列</param>         /// <param name="value">插入的值</param>         public void SetCellValue(string sheetName, int row, int col, object value)         {             ISheet s = GetSheet(sheetName);             SetCellValue(s, row, col, value);         }         /// <summary>         /// 获取单元格值         /// </summary>         /// <param name="sheetName">工作表名</param>         /// <param name="row">行</param>         /// <param name="col">列</param>         /// <returns></returns>         public ICell GetCell(string sheetName, int row, int col)         {             return GetSheet(sheetName).GetRow(row).Cells[col];         }           /// <summary>         /// 获取单元格值         /// </summary>         /// <param name="sheetName">工作表名</param>         /// <param name="row">行</param>         /// <param name="col">列</param>         /// <returns></returns>         private ICell GetCell(ISheet sheetName, int row, int col)         {             //return ws.GetRow(row).Cells[col];             return sheetName.GetRow(row).GetCell(col);         }         /// <summary>         /// 获取当前sheet的所有有数据的单元格         /// </summary>         /// <param name="sheetName"></param>         /// <returns></returns>         public List<ICell> GetHasValueCell(string sheetName)         {             List<ICell> values = new List<ICell>();             var sheet = GetSheet(sheetName);             int maxRow = sheet.LastRowNum + 1;             int maxCol = MaxCellIndex(sheetName);             for (int row = 0; row < maxRow; row++)             {                 for (int col = 0; col < maxCol; col++)                 {                     try                     {                         //这一行查不到值的话会报错                         ICell cell = sheet.GetRow(row)?.GetCell(col);                         if (cell != null) values.Add(cell);                     }                     catch (Exception)                     {                     }                 }             }             return values;         }         /// <summary>         /// 得到最大有效数据行索引         /// </summary>         /// <param name="sheetName"></param>         /// <returns></returns>         public int MaxRowIndex(string sheetName)         {             var sheet = GetSheet(sheetName);             return sheet.LastRowNum;         }         /// <summary>         /// 得到最大有效数据列从1开始         /// </summary>         /// <param name="sheetName"></param>         /// <returns></returns>         public int MaxCellIndex(string sheetName)         {             int maxCellIndex = -1;             var sheet = GetSheet(sheetName);             for (int rowCnt = sheet.FirstRowNum; rowCnt <= sheet.LastRowNum; rowCnt++)//迭代所有行             {                 IRow row = sheet.GetRow(rowCnt);                 if (row != null && row.LastCellNum > maxCellIndex)                 {                     maxCellIndex = row.LastCellNum;                 }             }             return maxCellIndex;         }         /// <summary>         /// 得到最大行和最大列的索引行从0开始列从0开始         /// </summary>         /// <param name="sheetName"></param>         /// <returns></returns>         public (int, int) GetMaxRowIndexAndCellIndex(string sheetName)         {             return (MaxRowIndex(sheetName), MaxCellIndex(sheetName) - 1);         }         /// <summary>         /// 得到最大行和最大列的索引，行从0开始列从1开始         /// </summary>         /// <param name="sheetName"></param>         /// <returns></returns>         public (int, int) GetMaxRowIndexAndCell(string sheetName)         {             return (MaxRowIndex(sheetName), MaxCellIndex(sheetName));         }         /// <summary>         /// 清除某行的值和样式         /// </summary>         /// <param name="sheetName"></param>         /// <param name="rowIndex"></param>         public void ClearRowValue(string sheetName, int rowIndex)         {             var sheet = GetSheet(sheetName);             if (sheet == null) return;             IRow row = sheet.GetRow(rowIndex);             if (row == null) return;             for (int i = 0; i < row.LastCellNum; i++)             {                 try                 {                     ICell cell = row.GetCell(i);                     cell.CellStyle = null;                     cell.SetCellValue(string.Empty);                 }                 catch (Exception)                 {                 }             }         }           /// <summary>         /// 获取起止范围内的行列值         /// </summary>         /// <param name="sheetName"></param>         /// <param name="startRow"></param>         /// <param name="startCol"></param>         /// <param name="endRow"></param>         /// <param name="endCol"></param>         /// <returns></returns>         public IList<ICell> GetCellsOfRange(string sheetName, int startRow, int startCol, int endRow, int endCol)         {             return (GetCellsOfRange(GetSheet(sheetName), startRow, startCol, endRow, endCol));         }           /// <summary>         /// 获取起止范围内的行列值         /// </summary>         /// <param name="sheetName"></param>         /// <param name="startRow"></param>         /// <param name="startCol"></param>         /// <param name="endRow"></param>         /// <param name="endCol"></param>         /// <returns></returns>         private IList<ICell> GetCellsOfRange(ISheet sheetName, int startRow, int startCol, int endRow, int endCol)         {             IList<ICell> allCell = new List<ICell>();             for (int i = startRow; i <= endRow; i++)                 for (int j = startCol; j <= endCol; j++)                 {                     allCell.Add(GetCell(sheetName, i, j));                 }             return allCell;         }           /// <summary>         /// 合并单元格         /// </summary>         /// <param name="sheetName"></param>         /// <param name="startRow"></param>         /// <param name="endRow"></param>         /// <param name="startCol"></param>         /// <param name="endCol"></param>         private void MergedCells(ISheet sheetName, int startRow, int endRow, int startCol, int endCol)         {             //CellRangeAddress四个参数为：起始行，结束行，起始列，结束列             var region = new CellRangeAddress(startRow, endRow, startCol, endCol);             sheetName.AddMergedRegion(region);         }             /// <summary>         /// 合并单元格         /// </summary>         /// <param name="sheetName"></param>         /// <param name="startRow"></param>         /// <param name="startCol"></param>         /// <param name="endRow"></param>         /// <param name="endCol"></param>         public void MergedCells(string sheetName, int startRow, int startCol, int endRow, int endCol)         {             MergedCells(GetSheet(sheetName), startRow, endRow, startCol, endCol);         }         /// <summary>         /// 文档另存为         /// </summary>         /// <param name="FileName"></param>         /// <returns></returns>         public bool SaveAs(string FileName)         {             npoiFileName = FileName;             try             {                 using (FileStream fs = new FileStream(FileName, FileMode.Create, FileAccess.Write))                 {                     workbook.Write(fs);                 }                 return true;             }             catch             {                 return false;             }         }         /// <summary>         /// 关闭         /// </summary>         public void Close()         {             workbook.Close();         }         /// <summary>         /// 自适应宽度         /// </summary>         /// <param name="sheetName">表名</param>         /// <param name="startCol">起始列</param>         /// <param name="endCol">结束列</param>         public void AutoColumnWidth(string sheetName, int startCol, int endCol)         {             AutoColumnWidth(GetSheet(sheetName), startCol, endCol);         }         /// <summary>         /// 自适应宽度         /// </summary>         /// <param name="sheet"></param>         /// <param name="cols"></param>         private void AutoColumnWidth(ISheet sheet, int startCol, int endCol)         {             for (int col = startCol; col <= endCol; col++)             {                 sheet.AutoSizeColumn(col);//但是其实还是比实际文本要宽             }         }           /// <summary>         /// 设置起止范围的行高，单位为磅         /// </summary>         /// <param name="sheetName">工作表名称</param>         /// <param name="startRow">起始行</param>         /// <param name="endRow">结束行</param>         /// <param name="heightValue">设置的高值</param>         public void SetRowsHeight(string sheetName, int startRow, int endRow, int heightValue)         {             ISheet sheet = GetSheet(sheetName);             for (int i = startRow; i <= endRow; i++)             {                 //sheet.GetRow(i).Height = Height * 20;                 sheet.GetRow(i).HeightInPoints = heightValue;             }         }           /// <summary>         /// 设置起止列的宽度,单位为字符         /// </summary>         /// <param name="sheetName">工作表名称</param>         /// <param name="startCol">起始列</param>         /// <param name="endCol">结束列</param>         /// <param name="widthValue">设置的宽度值</param>         public void SetColumnsWidth(string sheetName, int startCol, int endCol, int widthValue)         {             ISheet sheet = GetSheet(sheetName);             for (int j = startCol; j <= endCol; j++)             {                 sheet.SetColumnWidth(j, widthValue * 256);             }         }         /// <summary>         /// 插入新行         /// </summary>         /// <param name="sheetName">工作表名</param>         /// <param name="insertRowIndex">插入的行索引位置</param>         /// <param name="insertRowCount">插入的行数量</param>         /// <param name="formatRowIndex">获取插入行的参照样式的行索引</param>         public void InsertRow(string sheetName, int insertRowIndex, int insertRowCount, int formatRowIndex)         {             ISheet sheet = GetSheet(sheetName);             IRow formatRow = sheet.GetRow(formatRowIndex);             InsertRow(sheet, insertRowIndex, insertRowCount, formatRow);         }             /// <summary>         /// 插入新行         /// </summary>         /// <param name="sheetName"></param>         /// <param name="insertRowIndex"></param>         /// <param name="insertRowCount"></param>         /// <param name="formatRow"></param>         private void InsertRow(ISheet sheetName, int insertRowIndex, int insertRowCount, IRow formatRow)         {             sheet.ShiftRows(insertRowIndex, sheet.LastRowNum, insertRowCount, true, false);             for (int i = insertRowIndex; i < insertRowIndex + insertRowCount; i++)             {                 IRow targetRow = null;                 ICell sourceCell = null;                 ICell targetCell = null;                 targetRow = sheet.CreateRow(i);                 for (int m = formatRow.FirstCellNum; m < formatRow.LastCellNum; m++)                 {                     sourceCell = formatRow.GetCell(m);                     if (sourceCell == null)                     {                         continue;                     }                     targetCell = targetRow.CreateCell(m);                     targetCell.CellStyle = sourceCell.CellStyle;                     targetCell.SetCellType(sourceCell.CellType);                   }             }               for (int i = insertRowIndex; i < insertRowIndex + insertRowCount; i++)             {                 IRow firstTargetRow = sheet.GetRow(i);                 ICell firstSourceCell = null;                 ICell firstTargetCell = null;                   for (int m = formatRow.FirstCellNum; m < formatRow.LastCellNum; m++)                 {                     firstSourceCell = formatRow.GetCell(m, MissingCellPolicy.CREATE_NULL_AS_BLANK);                     if (firstSourceCell == null)                     {                         continue;                     }                     firstTargetCell = firstTargetRow.GetCell(m, MissingCellPolicy.CREATE_NULL_AS_BLANK);                     firstTargetCell.CellStyle = firstSourceCell.CellStyle;                     firstTargetCell.SetCellType(firstSourceCell.CellType);                 }             }         }             //--------------------------------------------------------------------新增的方法-------------------------------------           #region 自定义样式         /// <summary>         /// 自定义样式         /// </summary>         /// <param name="fontSize"></param>         /// <param name="fontName"></param>         /// <param name="horizontalAlignment"></param>         /// <param name="verticalAlignment"></param>         /// <returns></returns>         public ICellStyle CreateCellStyle(int fontSize, string fontName, bool fontBold, HorizontalAlignment horizontal, VerticalAlignment vertical, BorderStyle borderStyle)         {             ICellStyle style = workbook.CreateCellStyle();             IFont font = workbook.CreateFont();             font.FontName = fontName;             font.FontHeightInPoints = (short)fontSize;             if (fontBold) font.Boldweight = (short)FontBoldWeight.Bold;//字体加粗             style.Alignment = horizontal;             style.VerticalAlignment = vertical;             style.SetFont(font);             style.BorderLeft = borderStyle;             style.BorderRight = borderStyle;             style.BorderTop = borderStyle;             style.BorderBottom = borderStyle;             return style;         }         /// <summary>         /// 得到数据行常规样式（11 字号+居中对齐）         /// </summary>         /// <returns></returns>         public ICellStyle GetNormalCellStyle()         {             return GetNormalCellStyle(11, HorizontalAlignment.Center);         }         public ICellStyle GetNormalCellStyle(int fontSize, HorizontalAlignment horizontal)         {             return CreateCellStyle(fontSize, "Arial", false, horizontal, VerticalAlignment.Center, BorderStyle.Thin);         }         /// <summary>         /// 得到标题样式(20字号+加粗+居中对齐)         /// </summary>         /// <returns></returns>         public ICellStyle GetHeaderCellStyle()         {             return CreateCellStyle(20, "Arial", true, HorizontalAlignment.Center, VerticalAlignment.Center, BorderStyle.Thin);         }         #endregion           #region 设置行列的边框，以及样式         /// <summary>         /// 设置指定列，指定范围行的边框 （传从0 开始的索引）         /// </summary>         public void SetCellRangeBorder(string sheetName, int cellIndex, int startRow, int endRow, ICellStyle cellStyle)         {             SetRengeBorder(sheetName, startRow, cellIndex, endRow, cellIndex, cellStyle);         }         /// <summary>         /// 设置指定行指定范围列的边框（传从0 开始的索引）         /// </summary>         public void SetRowRangeBorder(string sheetName, int rowIndex, int startCell, int endCell, ICellStyle cellStyle)         {             SetRengeBorder(sheetName, rowIndex, startCell, rowIndex, endCell, cellStyle);         }         /// <summary>         /// 设置指定范围的边框，（传从0 开始的索引）         /// </summary>         public void SetRengeBorder(string sheetName, int startRow, int startCell, int endRow, int endCell, ICellStyle cellStyle)         {             var sheet = GetSheet(sheetName);             for (int i = startRow; i <= endRow; i++)             {                 for (int n = startCell; n <= endCell; n++)                 {                     var row = sheet.GetRow(i) ?? sheet.CreateRow(i);                     var cell = row.GetCell(n);                     if (cell == null)                     {                         cell = sheet.GetRow(i).CreateCell(n);                     }                     cell.CellStyle = cellStyle;                 }             }         }         #endregion           #region 合并单元格，带样式         /// <summary>         /// 合并单元格常规样式         /// </summary>         /// <param name="sheetName"></param>         /// <param name="startRow"></param>         /// <param name="startCol"></param>         /// <param name="endRow"></param>         /// <param name="endCol"></param>         public void MergedCellsStyle(string sheetName, int startRow, int startCol, int endRow, int endCol)         {             MergedCellsStyle(sheetName, startRow, startCol, endRow, endCol, GetNormalCellStyle());         }         /// <summary>         /// 合并单元格指定样式         /// </summary>         /// <param name="sheetName"></param>         /// <param name="startRow"></param>         /// <param name="startCol"></param>         /// <param name="endRow"></param>         /// <param name="endCol"></param>         /// <param name="cellStyle"></param>         public void MergedCellsStyle(string sheetName, int startRow, int startCol, int endRow, int endCol, ICellStyle cellStyle)         {             MergedCells(GetSheet(sheetName), startRow, endRow, startCol, endCol);             for (int i = startRow; i <= endRow; i++)             {                 SetRowRangeBorder(sheetName, i, startCol, endCol, cellStyle);             }         }         #endregion           /// <summary>         /// 设置表格内有效数据行样式（全部行）(填充完数据后调用)         /// </summary>         /// <param name="sheetName"></param>         /// <param name="cellStyle">样式</param>         /// <param name="isIgnoreHeader">是否忽略掉标题，前两行</param>         /// <param name="isAutoW">内容是否自适应宽度</param>         public void SetValidDataRowStyle(string sheetName, ICellStyle cellStyle, bool isIgnoreHeader = true, bool isAutoW = true)         {             var (row, cell) = GetMaxRowIndexAndCellIndex(sheetName);             int startRow = isIgnoreHeader ? 2 : 0;             SetRengeBorder(sheetName, startRow, 0, row, cell, cellStyle);             if (isAutoW) AutoColumnWidth(sheetName, 0, cell);         }     } }