C#使用Free Spire.XLS for .NET实现将SQL数据导出为PDF文件

Install-Package FreeSpire.XLS
Install-Package Microsoft.Data.SqlClient

using Spire.Xls;
using System.Data;
using Microsoft.Data.SqlClient;
using System.Drawing;

/// <summary>
/// 从数据库查询数据并填充到 DataTable
/// </summary>
/// <param name="connectionString">数据库连接字符串</param>
/// <param name="sqlQuery">查询 SQL 语句</param>
/// <returns>填充后的 DataTable</returns>
private static DataTable GetDataFromDatabase(string connectionString, string sqlQuery)
{
    DataTable dataTable = new DataTable();

    using (SqlConnection conn = new SqlConnection(connectionString))
    {
        SqlDataAdapter adapter = new SqlDataAdapter(sqlQuery, conn);
        try
        {
            adapter.Fill(dataTable);
        }
        catch (Exception ex)
        {
            Console.WriteLine($"数据读取失败：{ex.Message}");
            throw;
        }
    }
    return dataTable;
}

/// <summary>
/// 将 DataTable 数据导出为 PDF 文件
/// </summary>
/// <param name="dataTable">数据源</param>
/// <param name="outputPdfPath">PDF 输出路径</param>
public static void ExportDataTableToPdf(DataTable dataTable, string outputPdfPath)
{
    // 创建工作簿，using 语句自动释放资源
    using (Workbook workbook = new Workbook())
    {
        Worksheet sheet = workbook.Worksheets[0];
        sheet.Name = "数据报表";

        // 将 DataTable 批量写入工作表，参数：数据源、是否显示列名、起始行、起始列
        sheet.InsertDataTable(dataTable, true, 1, 1);

        // 自动获取已填充数据的单元格区域，无需手动计算行列
        CellRange usedRange = sheet.AllocatedRange;

        // 设置表头样式（第一行）
        CellRange headerRange = sheet.Range[1, 1, 1, dataTable.Columns.Count];
        headerRange.Style.Font.IsBold = true;
        headerRange.Style.Font.Size = 11;
        headerRange.Style.Color = Color.LightSkyBlue;
        headerRange.Style.HorizontalAlignment = HorizontalAlignType.Center;
        headerRange.Style.VerticalAlignment = VerticalAlignType.Center;

        // 快速设置全数据区域边框（外边框+内部分隔线）
        usedRange.BorderAround(LineStyleType.Thin);
        usedRange.BorderInside(LineStyleType.Thin);

        // 设置全数据区域居中对齐
        usedRange.Style.HorizontalAlignment = HorizontalAlignType.Center;
        usedRange.Style.VerticalAlignment = VerticalAlignType.Center;

        // 仅对有数据的列执行自适应，提升性能
        usedRange.AutoFitColumns();

        // 页面设置：表格内容在页面中水平居中
        sheet.PageSetup.CenterHorizontally = true;

        // 导出为 PDF 文件
        workbook.SaveToFile(outputPdfPath, FileFormat.PDF);
    }
}

static void Main(string[] args)
{
    // 数据库连接字符串
    string connString = "Server=localhost\\SQLEXPRESS;Database=SalesDB;User ID=demouser;Password=YourPassword;Encrypt=true;TrustServerCertificate=true;";

    // 查询 SQL
    string sql = @"
    SELECT 
        o.OrderID AS 订单编号,
        c.CustomerName AS 客户名称,
        o.OrderDate AS 订单日期,
        o.TotalAmount AS 订单金额
    FROM Orders o
    JOIN Customers c ON o.CustomerID = c.CustomerID
    WHERE YEAR(o.OrderDate) = 2026;
";
  
  
    // PDF 输出路径
    string outputPath = @"D:\Reports\SalesReport_2026.pdf";

    try
    {
        DataTable data = GetDataFromDatabase(connString, sql);
        ExportDataTableToPdf(data, outputPath);
        Console.WriteLine($"PDF 导出成功，文件已保存至：{outputPath}");
    }
    catch (Exception ex)
    {
        Console.WriteLine($"导出流程出错：{ex.Message}");
    }

    Console.ReadKey();
}

sheet.PageSetup.Orientation = PageOrientationType.Landscape;
sheet.PageSetup.PaperSize = PaperSizeType.PaperA4;

workbook.ConverterSetting.SheetFitToWidth = 1;
workbook.ConverterSetting.SheetFitToPage = false;