C# WPF实现数据记录导出excel

Install-Package System.Data.SQLite
Install-Package EPPlus

<Window x:Class="StudentScoreApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="学生成绩查询" Height="400" Width="600">
    <Grid>
        <DataGrid x:Name="scoreDataGrid" AutoGenerateColumns="True" HeadersVisibility="Column" IsReadOnly="True" 
                  Margin="10,10,10,50" />
        <Button Content="导出" Width="100" Height="30" VerticalAlignment="Bottom" HorizontalAlignment="Right" Margin="10" Click="ExportScore_Click"/>
    </Grid>
</Window>

using System;
using System.Data;
using System.Data.SQLite;
using System.Windows;
 
namespace StudentScoreApp
{
    public partial class MainWindow : Window
    {
        private DataTable _scoreTable;
 
        public MainWindow()
        {
            InitializeComponent();
            LoadData();
        }
 
        private void LoadData()
        {
            string connectionString = "Data Source=StudentScores.db;Version=3;";
            using (SQLiteConnection connection = new SQLiteConnection(connectionString))
            {
                connection.Open();
                string query = "SELECT StudentID, Name, Subject, Score FROM StudentScores";
                SQLiteDataAdapter adapter = new SQLiteDataAdapter(query, connection);
                _scoreTable = new DataTable();
                adapter.Fill(_scoreTable);
                scoreDataGrid.ItemsSource = _scoreTable.DefaultView;
            }
        }
    }
}

using OfficeOpenXml;
using Microsoft.Win32;
using System.IO;
 
namespace StudentScoreApp
{
    public partial class MainWindow : Window
    {
        // 其他代码...
 
        private void ExportScore_Click(object sender, RoutedEventArgs e)
        {
            if (_scoreTable == null || _scoreTable.Rows.Count == 0)
            {
                MessageBox.Show("没有数据可导出。");
                return;
            }
 
            SaveFileDialog saveFileDialog = new SaveFileDialog
            {
                Filter = "Excel Files|*.xlsx",
                Title = "保存为 Excel 文件",
                FileName = "StudentScores.xlsx"
            };
 
            if (saveFileDialog.ShowDialog() == true)
            {
                try
                {
                    using (ExcelPackage package = new ExcelPackage())
                    {
                        ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("Scores");
 
                        // 将 DataTable 写入 Excel
                        worksheet.Cells["A1"].LoadFromDataTable(_scoreTable, true);
 
                        // 保存到文件
                        FileInfo fileInfo = new FileInfo(saveFileDialog.FileName);
                        package.SaveAs(fileInfo);
 
                        MessageBox.Show("成绩已成功导出到 Excel 文件。");
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show("导出时发生错误: " + ex.Message);
                }
            }
        }
    }
}

// 在您的应用程序入口点，如 Main 方法或者其他初始化代码中执行以下设置
ExcelPackage.LicenseContext = LicenseContext.NonCommercial; // 设置为非商业使用