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using System;
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using System.Collections.Generic;
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using System.Data;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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using NPOI.SS.UserModel;
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using NPOI.XSSF.UserModel;
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namespace Tool
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{
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public class ExcelHelper
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{
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/// <summary>
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/// Excel行高，Height的单位是1/20个点。例：设置高度为25个点
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/// </summary>
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private static short rowHeight = 25 * 20;
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#region 导出Excel
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#region 导出
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/// <summary>
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/// 导出
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/// </summary>
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/// <param name="dt">数据源</param>
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/// <param name="strHeader">列名</param>
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/// <param name="fileName">绝对路径</param>
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/// <param name="sheetName">sheet页名</param>
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public static void Export(DataTable dt, string strHeader, string fileName, string sheetName = "Sheet1")
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{
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// 使用 NPOI 组件导出 Excel 文件
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//XSSFWorkbook:是操作Excel2007的版本，扩展名是.xlsx
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XSSFWorkbook workbook = new XSSFWorkbook();
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//HSSFWorkbook:是操作Excel2003以前（包括2003）的版本，扩展名是.xls
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//HSSFWorkbook workbook = new HSSFWorkbook();
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//创建Sheet
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ISheet sheet = workbook.CreateSheet(sheetName);
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//对列名拆分
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string[] strArry = strHeader.Split(',');
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//设置单元格样式
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ICellStyle style = SetCellStyle(workbook);
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//创建表格
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NPOICreateTable(dt, strArry, sheet, style, 0);
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// 将 Excel 文件保存到磁盘
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NPOISaveFile(workbook, fileName);
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// 释放资源
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//workbook.Dispose();
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}
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#endregion
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#region 自定义框架，导出
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/// <summary>
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/// 自定义顶部，导出
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/// </summary>
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/// <param name="dt">数据源</param>
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/// <param name="strArry">拆分后列名</param>
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/// <param name="fileName">绝对路径，路径+文件名+后缀</param>
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/// <param name="num">新一行索引，开始</param>
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/// <param name="workbook"></param>
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/// <param name="sheet"></param>
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public static void Export(DataTable dt, string[] strArry, string fileName, int num, XSSFWorkbook workbook, ISheet sheet)
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{
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//设置单元格样式
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ICellStyle style = SetCellStyle(workbook);
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//创建表格
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NPOICreateTable(dt, strArry, sheet, style, num);
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// 将 Excel 文件保存到磁盘
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NPOISaveFile(workbook, fileName);
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// 释放资源
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//workbook.Dispose();
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}
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#endregion
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#endregion
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#region 保存文件
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private static string NPOISaveFile(XSSFWorkbook workbook, string fileName)
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{
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try
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{
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// 将 Excel 文件保存到磁盘
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using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
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{
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workbook.Write(fs);
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}
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return "";
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}
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catch (Exception err)
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{
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return err.Message;
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}
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}
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#endregion
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#region 创建表格
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/// <summary>
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/// 创建表格
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/// </summary>
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/// <param name="dt">数据源</param>
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/// <param name="strArry">拆分后的列名</param>
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/// <param name="sheet">Sheet页</param>
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/// <param name="style">样式</param>
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/// <param name="num">行索引</param>
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private static void NPOICreateTable(DataTable dt, string[] strArry, ISheet sheet, ICellStyle style, int num)
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{
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IRow row = null;//声明行
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#region 创建列名
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//在索引 num 的位置 创建一行
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row = sheet.CreateRow(num);
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row.Height = rowHeight;//设置行高
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//循环列名数组，创建单元格并赋值、样式
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for (int i = 0; i < strArry.Length; i++)
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{
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row.CreateCell(i).SetCellValue(strArry[i]);
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row.GetCell(i).CellStyle = style;
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}
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#endregion
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#region 创建行
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//循环数据源 创建行
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for (int i = 0; i < dt.Rows.Count; i++)
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{
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//创建行
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row = sheet.CreateRow(num + 1);
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row.Height = rowHeight;//设置行高
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num++;//行索引自增
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//循环数据源列集合，创建单元格
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for (int j = 0; j < dt.Columns.Count; j++)
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{
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string ValueType = "";//值类型
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string Value = "";//值
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//类型 和 值，赋值
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if (dt.Rows[i][j].ToString() != null)
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{
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ValueType = dt.Rows[i][j].GetType().ToString();
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Value = dt.Rows[i][j].ToString();
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}
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//根据不同数据类型，对数据处理。处理后创建单元格并赋值 和 样式
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switch (ValueType)
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{
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case "System.String"://字符串类型
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row.CreateCell(j).SetCellValue(Value);
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break;
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case "System.DateTime"://日期类型
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System.DateTime dateV;
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System.DateTime.TryParse(Value, out dateV);
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row.CreateCell(j).SetCellValue(dateV.ToString("yyyy-MM-dd"));
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break;
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case "System.Boolean"://布尔型
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bool boolV = false;
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bool.TryParse(Value, out boolV);
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row.CreateCell(j).SetCellValue(boolV);
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break;
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case "System.Int16"://整型
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case "System.Int32":
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case "System.Int64":
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case "System.Byte":
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int intV = 0;
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int.TryParse(Value, out intV);
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row.CreateCell(j).SetCellValue(intV);
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break;
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case "System.Decimal"://浮点型
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case "System.Double":
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double doubV = 0;
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double.TryParse(Value, out doubV);
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row.CreateCell(j).SetCellValue(doubV);
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break;
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case "System.DBNull"://空值处理
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row.CreateCell(j).SetCellValue("");
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break;
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default:
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row.CreateCell(j).SetCellValue("");
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break;
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}
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row.GetCell(j).CellStyle = style;
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//设置宽度
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//sheet.SetColumnWidth(j, (Value.Length + 10) * 256);
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}
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}
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#endregion
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//循环列名数组，多所有列 设置 自动列宽
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for (int i = 0; i < strArry.Length; i++)
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{
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sheet.AutoSizeColumn(i);
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}
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}
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#endregion
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#region 设置单元格样式
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public static ICellStyle SetCellStyle(XSSFWorkbook workbook)
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{
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#region 单元格样式
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//创建一个样式
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ICellStyle style = workbook.CreateCellStyle();
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style.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;//水平对齐
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style.VerticalAlignment = VerticalAlignment.Center;//垂直对齐
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style.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;//下边框为细线边框
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style.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;//左边框
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style.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;//上边框
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style.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;//右边框
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#endregion
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return style;
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}
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#endregion
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}
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}
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