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+using OfficeOpenXml;
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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.Drawing;
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+using System.IO;
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+using System.Text;
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+
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+namespace Masuit.Tools.Excel
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+{
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+ public static class ExcelExtension
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+ {
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+ static ExcelExtension()
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+ {
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+ ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
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+ }
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+
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+ /// <summary>
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+ /// 将内存表自动填充到Excel
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+ /// </summary>
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+ /// <param name="sheetTables">sheet名和内存表的映射</param>
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+ /// <param name="password">密码</param>
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+ /// <returns>内存流</returns>
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+ public static MemoryStream DataTableToExcel(this Dictionary<string, DataTable> sheetTables, string password = null)
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+ {
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+ using (var pkg = new ExcelPackage())
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+ {
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+ foreach (var pair in sheetTables)
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+ {
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+ pair.Value.TableName = pair.Key;
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+ CreateWorksheet(pkg, pair.Value);
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+ }
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+
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+ return SaveAsStream(pkg, password);
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+ }
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+ }
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+
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+ /// <summary>
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+ /// 将内存表自动填充到Excel
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+ /// </summary>
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+ /// <param name="tables">内存表</param>
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+ /// <param name="password">密码</param>
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+ /// <returns>内存流</returns>
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+ public static MemoryStream DataTableToExcel(this List<DataTable> tables, string password = null)
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+ {
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+ using var pkg = new ExcelPackage();
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+ foreach (var table in tables)
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+ {
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+ CreateWorksheet(pkg, table);
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+ }
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+
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+ return SaveAsStream(pkg, password);
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+ }
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+
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+ /// <summary>
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+ /// 将内存表自动填充到Excel
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+ /// </summary>
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+ /// <param name="table">内存表</param>
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+ /// <param name="password">密码</param>
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+ /// <returns>内存流</returns>
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+ public static MemoryStream ToExcel(this DataTable table, string password = null)
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+ {
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+ using var pkg = new ExcelPackage();
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+ CreateWorksheet(pkg, table);
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+ return SaveAsStream(pkg, password);
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+ }
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+
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+ private static MemoryStream SaveAsStream(ExcelPackage pkg, string password)
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+ {
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+ var ms = new MemoryStream();
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+ if (!string.IsNullOrEmpty(password))
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+ {
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+ pkg.SaveAs(ms, password);
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+ }
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+ else
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+ {
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+ pkg.SaveAs(ms);
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+ }
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+
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+ return ms;
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+ }
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+
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+ public static void CreateWorksheet(this ExcelPackage pkg, DataTable table)
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+ {
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+ if (string.IsNullOrEmpty(table.TableName))
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+ {
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+ table.TableName = "Sheet1";
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+ }
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+
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+ pkg.Workbook.Worksheets.Add(table.TableName);
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+ var sheet = pkg.Workbook.Worksheets[table.TableName];
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+
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+ // 填充表头
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+ for (var j = 0; j < table.Columns.Count; j++)
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+ {
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+ sheet.SetValue(1, j + 1, table.Columns[j].ColumnName);
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+ }
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+
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+ sheet.Row(1).Style.Font.Bold = true; // 表头设置为粗体
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+ sheet.Row(1).Style.Font.Size = sheet.Row(1).Style.Font.Size * 1.11f; // 表头字号放大1.11倍
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+ sheet.Row(1).CustomHeight = true; // 自动调整行高
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+ sheet.Cells.AutoFitColumns(); // 表头自适应列宽
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+ sheet.Cells.Style.WrapText = true;
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+
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+ // 填充内容
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+ for (var i = 0; i < table.Rows.Count; i++)
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+ {
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+ sheet.Row(i + 2).CustomHeight = true; // 自动调整行高
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+ for (var j = 0; j < table.Columns.Count; j++)
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+ {
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+ if (table.Rows[i][j] is Stream s)
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+ {
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+ if (s.Length > 0)
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+ {
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+ using var img = Image.FromStream(s);
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+ using var bmp = new Bitmap(img);
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+ bmp.SetResolution(96, 96);
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+ using var picture = sheet.Drawings.AddPicture(Guid.NewGuid().ToString(), bmp);
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+ picture.SetPosition(i + 1, 3, j, 5); //设置图片显示位置
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+ sheet.Row(i + 2).Height = 90;
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+ sheet.Column(j + 1).Width = 30;
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+ }
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+ }
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+ else
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+ {
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+ sheet.SetValue(i + 2, j + 1, table.Rows[i][j] ?? "");
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+
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+ // 根据单元格内容长度来自适应调整列宽
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+ var maxWidth = Encoding.UTF8.GetBytes(table.Rows[i][j].ToString()).Length;
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+ if (sheet.Column(j + 1).Width < maxWidth)
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+ {
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+ sheet.Cells[i + 2, j + 1].AutoFitColumns(18, 110); // 自适应最大列宽，最小18，最大110
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+ }
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+ }
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+ }
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+ }
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+
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+ //打印方向：纵向
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+ sheet.PrinterSettings.Orientation = eOrientation.Landscape;
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+
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+ //集中在一页里打印
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+ sheet.PrinterSettings.FitToPage = true;
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+
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+ //使用A4纸
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+ sheet.PrinterSettings.PaperSize = ePaperSize.A4;
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+ }
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+ }
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+}
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