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using NPOI.HSSF.UserModel;using NPOI.SS.UserModel;using NPOI.SS.Util;using System;using System.Collections.Generic;using System.Data;using System.IO;using System.Text;
namespace NFine.Code.Excel{ public class NPOIExcel { private string _title; private string _sheetName; private string _filePath;
/// <summary>
/// 导出到Excel
/// </summary>
/// <param name="table"></param>
/// <returns></returns>
public bool ToExcel(DataTable table) { FileStream fs = new FileStream(this._filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite); IWorkbook workBook = new HSSFWorkbook(); this._sheetName = this._sheetName.IsEmpty() ? "sheet1" : this._sheetName; ISheet sheet = workBook.CreateSheet(this._sheetName);
//处理表格标题
IRow row = sheet.CreateRow(0); row.CreateCell(0).SetCellValue(this._title); sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, table.Columns.Count - 1)); row.Height = 500;
ICellStyle cellStyle = workBook.CreateCellStyle(); IFont font = workBook.CreateFont(); font.FontName = "微软雅黑"; font.FontHeightInPoints = 17; cellStyle.SetFont(font); cellStyle.VerticalAlignment = VerticalAlignment.Center; cellStyle.Alignment = HorizontalAlignment.Center; row.Cells[0].CellStyle = cellStyle;
//处理表格列头
row = sheet.CreateRow(1); for (int i = 0; i < table.Columns.Count; i++) { row.CreateCell(i).SetCellValue(table.Columns[i].ColumnName); row.Height = 350; sheet.AutoSizeColumn(i); }
//处理数据内容
for (int i = 0; i < table.Rows.Count; i++) { row = sheet.CreateRow(2 + i); row.Height = 250; for (int j = 0; j < table.Columns.Count; j++) { row.CreateCell(j).SetCellValue(table.Rows[i][j].ToString()); sheet.SetColumnWidth(j, 256 * 15); } }
//写入数据流
workBook.Write(fs); fs.Flush(); fs.Close();
return true; }
/// <summary>
/// 导出到Excel
/// </summary>
/// <param name="table"></param>
/// <param name="title"></param>
/// <param name="sheetName"></param>
/// <returns></returns>
public bool ToExcel(DataTable table, string title, string sheetName, string filePath) { this._title = title; this._sheetName = sheetName; this._filePath = filePath; return ToExcel(table); }
/// <summary>
/// 组装workbook.
/// </summary>
/// <param name="dictionary">列头</param>
/// <param name="dt">dataTable数据</param>
/// <param name="columnHeader">表头</param>
/// <returns></returns>
public HSSFWorkbook BuildWorkbook(Dictionary<string, string> dictionary, DataTable dt, string columnHeader = "") { var workbook = new HSSFWorkbook(); ISheet sheet = workbook.CreateSheet(string.IsNullOrWhiteSpace(dt.TableName) ? "Sheet1" : dt.TableName);
var dateStyle = workbook.CreateCellStyle(); var format = workbook.CreateDataFormat(); dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
//取得列宽
// var arrColWidth = new int[dt.Columns.Count];
var arrColWidth = new int[dictionary.Count + 1]; int itemCoutn = 0;//需要导出的列的数量.
foreach (DataColumn item in dt.Columns) { //判断需要导出的 “列”
if (dictionary.ContainsKey(item.ColumnName)) { arrColWidth[itemCoutn] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length; itemCoutn++; } } itemCoutn = 0; for (var i = 0; i < dt.Rows.Count; i++) { for (var j = 0; j < dt.Columns.Count; j++) { //判断需要导出的 “列”
if (dictionary.ContainsKey(dt.Rows[i][j].ToString())) { int intTemp = Encoding.GetEncoding(936).GetBytes(dt.Rows[i][j].ToString()).Length; if (intTemp > arrColWidth[j]) { arrColWidth[j] = intTemp; } } } } int rowIndex = 0;//行索引，第一行为：表头（列头）
foreach (DataRow row in dt.Rows) { #region 表头 列头
if (rowIndex == 65535 || rowIndex == 0) { if (rowIndex != 0) { sheet = workbook.CreateSheet(); }
#region 表头及样式
{ IRow headerRow = sheet.CreateRow(0); headerRow.HeightInPoints = 19.5F; headerRow.Height = 40 * 20; headerRow.CreateCell(0).SetCellValue(columnHeader);
//CellStyle
ICellStyle headStyle = workbook.CreateCellStyle(); headStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;// 左右居中
headStyle.VerticalAlignment = VerticalAlignment.Center;// 上下居中
// 设置单元格的背景颜色（单元格的样式会覆盖列或行的样式）
headStyle.FillForegroundColor = (short)11; //定义font
IFont font = workbook.CreateFont(); font.FontHeightInPoints = 20; font.Boldweight = 700; headStyle.SetFont(font); headerRow.GetCell(0).CellStyle = headStyle; //根据表的列数计算
//sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, dt.Columns.Count - 1));
sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, dictionary.Count)); #endregion
} { #region 列头及样式
var headerRow = sheet.CreateRow(1); //CellStyle
ICellStyle headStyle = workbook.CreateCellStyle(); headStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;// 左右居中
headStyle.VerticalAlignment = VerticalAlignment.Center;// 上下居中
//定义font
IFont font = workbook.CreateFont(); font.FontHeightInPoints = 10; font.Boldweight = 700; headStyle.SetFont(font);
int columnCount = 0; foreach (var dic in dictionary) { foreach (DataColumn column in dt.Columns) { //判断需要导出的 “列”
if (dic.Key.ToLower() == column.ColumnName.ToLower()) { //headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
//headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
//sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
headerRow.CreateCell(columnCount).SetCellValue(dic.Value);//column.ColumnName
headerRow.GetCell(columnCount).CellStyle = headStyle; sheet.SetColumnWidth(columnCount, (arrColWidth[columnCount]) * 256); columnCount++; continue; } } } #endregion
}
rowIndex = 2; } #endregion
#region 内容
var dataRow = sheet.CreateRow(rowIndex);
int columnContentCount = 0; //column.Ordinal
foreach (var dicKey in dictionary) { foreach (DataColumn column in dt.Columns) { //判断需要导出的 “列”
if (dicKey.Key.ToLower() == column.ColumnName.ToLower()) { var newCell = dataRow.CreateCell(columnContentCount);
string drValue = row[column].ToString();
switch (column.DataType.ToString()) { case "System.String"://字符串类型
newCell.SetCellValue(drValue); break; case "System.DateTime"://日期类型
DateTime dateV; DateTime.TryParse(drValue, out dateV); newCell.SetCellValue(dateV);
newCell.CellStyle = dateStyle;//格式化显示
break; case "System.Boolean"://布尔型
bool boolV = false; bool.TryParse(drValue, out boolV); newCell.SetCellValue(boolV); break; case "System.Int16"://整型
case "System.Int32": case "System.Int64": case "System.Byte": int intV = 0; int.TryParse(drValue, out intV); newCell.SetCellValue(intV); break; case "System.Decimal"://浮点型
case "System.Double": double doubV = 0; double.TryParse(drValue, out doubV); newCell.SetCellValue(doubV); break; case "System.DBNull"://空值处理
newCell.SetCellValue(""); break; default: newCell.SetCellValue(""); break; } columnContentCount++;//列索引
continue; } } }
#endregion
rowIndex++; } //自动列宽
for (int i = 0; i <= dictionary.Count; i++) sheet.AutoSizeColumn(i, true);
return workbook; } }}
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