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+using OfficeOpenXml;
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+using OfficeOpenXml.Style;
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+using System;
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+using System.Data;
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+using System.Drawing;
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+using System.IO;
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+using System.Linq;
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+using System.Windows.Forms;
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+
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+namespace PTMedicalInsurance.Common
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+{
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+
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+ /// <summary>
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+ /// EPPlus DataTable导出Excel工具类
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+ /// 使用前需安装: Install-Package EPPlus
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+ /// </summary>
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+ public static class EPPlusExcelExporter
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+ {
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+ // 静态构造函数设置EPPlus许可证（EPPlus 5+需要）
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+ static EPPlusExcelExporter()
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+ {
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+ // EPPlus 5+ 需要设置许可证类型
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+ // 非商业用途使用：
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+ ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
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+
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+ // 商业用途请购买许可证后使用：
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+ // ExcelPackage.LicenseContext = LicenseContext.Commercial;
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+ }
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+
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+ /// <summary>
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+ /// DataTable导出Excel（基础版本）
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+ /// </summary>
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+ /// <param name="dataTable">数据源</param>
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+ /// <param name="filePath">导出路径</param>
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+ /// <param name="sheetName">Sheet名称</param>
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+ public static void ExportToExcel(DataTable dataTable, string filePath, string sheetName = "Sheet1")
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+ {
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+ if (dataTable == null || dataTable.Rows.Count == 0)
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+ throw new ArgumentException("DataTable为空或没有数据");
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+
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+ // 确保目录存在
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+ string directory = Path.GetDirectoryName(filePath);
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+ if (!Directory.Exists(directory))
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+ Directory.CreateDirectory(directory);
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+
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+ using (var package = new ExcelPackage())
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+ {
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+ var worksheet = package.Workbook.Worksheets.Add(sheetName);
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+
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+ // 写入数据（包含表头）
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+ worksheet.Cells[1, 1].LoadFromDataTable(dataTable, true);
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+
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+ // 设置表头样式
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+ FormatHeader(worksheet, dataTable.Columns.Count);
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+
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+ // 自动调整列宽
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+ worksheet.Cells.AutoFitColumns();
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+
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+ // 保存文件
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+ package.SaveAs(new FileInfo(filePath));
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+ }
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+ }
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+
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+ /// <summary>
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+ /// DataTable导出Excel（分批处理版本 - 每500行处理一次）
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+ /// </summary>
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+ /// <param name="dataTable">数据源</param>
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+ /// <param name="filePath">导出路径</param>
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+ /// <param name="batchSize">每批处理行数（默认500）</param>
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+ /// <param name="sheetName">Sheet名称</param>
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+ public static void ExportToExcelBatch(DataTable dataTable, string filePath, int batchSize = 500)
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+ {
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+ string sheetName = "Sheet1";
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+ if (dataTable == null || dataTable.Rows.Count == 0)
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+ throw new ArgumentException("DataTable为空或没有数据");
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+
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+ // 确保目录存在
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+ string directory = Path.GetDirectoryName(filePath);
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+ if (!Directory.Exists(directory))
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+ Directory.CreateDirectory(directory);
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+
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+ int totalRows = dataTable.Rows.Count;
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+ int columnCount = dataTable.Columns.Count;
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+
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+ using (var package = new ExcelPackage())
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+ {
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+ var worksheet = package.Workbook.Worksheets.Add(sheetName);
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+
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+ // 写入表头
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+ for (int col = 0; col < columnCount; col++)
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+ {
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+ worksheet.Cells[1, col + 1].Value = dataTable.Columns[col].ColumnName;
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+ }
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+ FormatHeader(worksheet, columnCount);
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+
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+ // 分批写入数据
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+ int currentRow = 2; // 从第2行开始（第1行是表头）
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+ int batchCount = (int)Math.Ceiling((double)totalRows / batchSize);
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+
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+ Console.WriteLine($"总数据: {totalRows} 行, 分批: {batchCount} 批, 每批: {batchSize} 行");
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+
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+ for (int batch = 0; batch < batchCount; batch++)
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+ {
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+ int startRow = batch * batchSize;
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+ int endRow = Math.Min(startRow + batchSize, totalRows);
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+ int rowsInBatch = endRow - startRow;
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+
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+ Console.WriteLine($"处理第 {batch + 1}/{batchCount} 批: 行 {startRow + 1} - {endRow}");
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+
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+ // 当前批次的数据数组
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+ object[,] batchData = new object[rowsInBatch, columnCount];
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+
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+ for (int i = 0; i < rowsInBatch; i++)
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+ {
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+ for (int j = 0; j < columnCount; j++)
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+ {
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+ batchData[i, j] = dataTable.Rows[startRow + i][j];
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+ }
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+ }
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+
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+ // 写入当前批次到Excel
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+ var range = worksheet.Cells[currentRow, 1, currentRow + rowsInBatch - 1, columnCount];
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+ range.Value = batchData;
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+
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+ currentRow += rowsInBatch;
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+ }
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+
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+ // 格式化数据区域
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+ FormatDataRange(worksheet, totalRows, columnCount);
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+
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+ // 自动调整列宽
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+ worksheet.Cells.AutoFitColumns();
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+
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+ // 冻结首行
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+ worksheet.View.FreezePanes(2, 1);
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+
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+ // 保存文件
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+ package.SaveAs(new FileInfo(filePath));
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+ Console.WriteLine($"导出完成: {filePath}");
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+ MessageBox.Show(" 导出完毕："+filePath);
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+ }
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+ }
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+
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+ /// <summary>
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+ /// 大数据导出（自动分Sheet，每个Sheet最多100万行）
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+ /// </summary>
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+ public static void ExportLargeData(DataTable dataTable, string filePath, int rowsPerSheet = 1000000)
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+ {
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+ if (dataTable == null || dataTable.Rows.Count == 0)
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+ throw new ArgumentException("DataTable为空或没有数据");
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+
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+ string directory = Path.GetDirectoryName(filePath);
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+ if (!Directory.Exists(directory))
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+ Directory.CreateDirectory(directory);
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+
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+ int totalRows = dataTable.Rows.Count;
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+ int columnCount = dataTable.Columns.Count;
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+ int sheetCount = (int)Math.Ceiling((double)totalRows / rowsPerSheet);
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+
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+ using (var package = new ExcelPackage())
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+ {
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+ for (int sheetIndex = 0; sheetIndex < sheetCount; sheetIndex++)
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+ {
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+ string sheetName = sheetCount == 1 ? "数据" : $"数据_{sheetIndex + 1}";
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+ var worksheet = package.Workbook.Worksheets.Add(sheetName);
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+
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+ // 当前Sheet的数据范围
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+ int startRow = sheetIndex * rowsPerSheet;
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+ int endRow = Math.Min(startRow + rowsPerSheet, totalRows);
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+ int rowsInSheet = endRow - startRow;
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+
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+ // 写入表头
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+ for (int col = 0; col < columnCount; col++)
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+ {
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+ worksheet.Cells[1, col + 1].Value = dataTable.Columns[col].ColumnName;
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+ }
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+ FormatHeader(worksheet, columnCount);
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+
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+ // 分批写入数据（每批500行）
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+ int batchSize = 500;
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+ int currentRow = 2;
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+ int batchesInSheet = (int)Math.Ceiling((double)rowsInSheet / batchSize);
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+
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+ for (int batch = 0; batch < batchesInSheet; batch++)
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+ {
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+ int batchStart = startRow + batch * batchSize;
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+ int batchEnd = Math.Min(batchStart + batchSize, endRow);
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+ int rowsInBatch = batchEnd - batchStart;
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+
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+ object[,] batchData = new object[rowsInBatch, columnCount];
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+ for (int i = 0; i < rowsInBatch; i++)
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+ {
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+ for (int j = 0; j < columnCount; j++)
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+ {
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+ batchData[i, j] = dataTable.Rows[batchStart + i][j];
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+ }
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+ }
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+
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+ var range = worksheet.Cells[currentRow, 1, currentRow + rowsInBatch - 1, columnCount];
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+ range.Value = batchData;
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+ currentRow += rowsInBatch;
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+ }
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+
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+ FormatDataRange(worksheet, rowsInSheet, columnCount);
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+ worksheet.Cells.AutoFitColumns();
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+ worksheet.View.FreezePanes(2, 1);
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+ }
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+
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+ package.SaveAs(new FileInfo(filePath));
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+ }
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+ }
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+
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+ /// <summary>
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+ /// DataTable转内存流（适用于Web下载）
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+ /// </summary>
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+ public static MemoryStream ExportToStream(DataTable dataTable, string sheetName = "Sheet1")
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+ {
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+ if (dataTable == null || dataTable.Rows.Count == 0)
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+ throw new ArgumentException("DataTable为空或没有数据");
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+
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+ using (var package = new ExcelPackage())
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+ {
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+ var worksheet = package.Workbook.Worksheets.Add(sheetName);
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+ worksheet.Cells[1, 1].LoadFromDataTable(dataTable, true);
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+ FormatHeader(worksheet, dataTable.Columns.Count);
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+ worksheet.Cells.AutoFitColumns();
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+
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+ var stream = new MemoryStream();
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+ package.SaveAs(stream);
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+ stream.Position = 0;
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+ return stream;
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+ }
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+ }
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+
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+ #region 私有方法
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+
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+ /// <summary>
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+ /// 设置表头样式
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+ /// </summary>
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+ private static void FormatHeader(ExcelWorksheet worksheet, int columnCount)
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+ {
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+ var headerRange = worksheet.Cells[1, 1, 1, columnCount];
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+
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+ headerRange.Style.Font.Bold = true;
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+ headerRange.Style.Font.Size = 11;
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+ headerRange.Style.Fill.PatternType = ExcelFillStyle.Solid;
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+ headerRange.Style.Fill.BackgroundColor.SetColor(Color.FromArgb(192, 192, 192)); // 灰色
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+ headerRange.Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;
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+ headerRange.Style.VerticalAlignment = ExcelVerticalAlignment.Center;
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+ headerRange.Style.Border.Bottom.Style = ExcelBorderStyle.Thin;
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+ }
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+
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+ /// <summary>
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+ /// 设置数据区域样式
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+ /// </summary>
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+ private static void FormatDataRange(ExcelWorksheet worksheet, int dataRows, int columnCount)
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+ {
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+ var dataRange = worksheet.Cells[2, 1, dataRows + 1, columnCount];
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+
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+ dataRange.Style.Font.Size = 10;
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+ dataRange.Style.HorizontalAlignment = ExcelHorizontalAlignment.Left;
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+ dataRange.Style.VerticalAlignment = ExcelVerticalAlignment.Center;
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+
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+ // 添加边框
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+ dataRange.Style.Border.Top.Style = ExcelBorderStyle.Thin;
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+ dataRange.Style.Border.Bottom.Style = ExcelBorderStyle.Thin;
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+ dataRange.Style.Border.Left.Style = ExcelBorderStyle.Thin;
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+ dataRange.Style.Border.Right.Style = ExcelBorderStyle.Thin;
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+
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+ // 设置行高
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+ worksheet.DefaultRowHeight = 18;
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+ }
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+
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+ #endregion
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+ }
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+}
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zzz