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将 DataGridView 数据导出为Excel

1. 首先，需要将数据DataGridView对象转换为DataTable

private void btnExport_Click(object sender, EventArgs e)
{
    // 1.将当前页面的dataGridView获取并且转换为datatable对象用于转换数据
    DataTable dt = new DataTable();

    // 创建一个新的DataTable，并添加列  
    for (int i = 0; i < dvgame.ColumnCount; i++)
    {
        dt.Columns.Add(dvgame.Columns[i].HeaderText);
    }

    // 添加行数据  
    for (int i = 0; i < dvgame.RowCount; i++)
    {
        DataRow dr = dt.NewRow();
        for (int j = 0; j < dvgame.ColumnCount; j++)
        {
            dr[j] = dvgame.Rows[i].Cells[j].Value.ToString();
        }
        dt.Rows.Add(dr);
    }
	// 2.使用工具类，将datatable导出为Excel
    ExcelDataConvert.DataToExcel(dt);
}

2. 将DataTable传入工具类中，导出为Excel

public static void DataToExcel(DataTable dataTable)
{
    // 1.创建一个Excel文件
    ExcelPackage.LicenseContext = LicenseContext.NonCommercial; // 使用非商业许可
    ExcelPackage excelPackage = new ExcelPackage();
    // 2.创建一个ExcelSheet 工作表  
    ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet1");
    // 3.将数据写入到Excel中
    worksheet.Cells["A1"].LoadFromDataTable(dataTable, true);
    // 4.保存文件 保存Excel文件  
    string dictFolder = "C:\\Users\\robin\\Desktop\\csharpExcels";

    DateTime currentTime = DateTime.Now;
    string year = "\\" + currentTime.Year.ToString();
    string month = "\\" + currentTime.Month.ToString();
    string day = "\\" + currentTime.Day.ToString();

    dictFolder += year + month + day;

    // 判断文件夹是否存在，如果不存在则递归创建
    if (!Directory.Exists(dictFolder))
    {
        Directory.CreateDirectory(dictFolder);
    }

    string fileName = "\\" + DateTime.Now.ToString("hh-mm-ss")+ "games.xlsx";

    string filePath = dictFolder + fileName;

    if (File.Exists(filePath))
    {
        File.Delete(filePath);
    }
    excelPackage.SaveAs(new FileInfo(filePath));
    // Console.WriteLine("Excel文件已导出！");
    MessageBox.Show("Excel文件已经导出！路径为"+filePath);
}

将Excel导入到数据库中

导入数据无非就是，读取数据，以及Sql注入

public static void ExcelToDataGame(string filepath)
{

    // 1.配置Eplus
    ExcelPackage.LicenseContext = LicenseContext.NonCommercial; // 使用非商业许可，如有需要请更改  
    ExcelPackage package = new ExcelPackage(new FileInfo(filepath));

    ExcelWorksheet worksheet = package.Workbook.Worksheets[0];  // 选择第一个工作表  
    int rowCount = worksheet.Dimension.Rows;  // 获取行数  
    int colCount = worksheet.Dimension.Columns;  // 获取列数  

    // 2.获取数据库对象
    GameDataAccess conn =  GameDataAccess.GetInstance();
    int importCounts = 0;
    for (int row = 1; row <= rowCount; row++)
    {
        if (row == 1)
        {
            continue;
        }
        // 3.每次读取一行，执行一行SQl的插入
        string sql = "";
        GameEntity game = new GameEntity();
        game.GameName = worksheet.Cells[row, 1].Value.ToString();
        game.BackImg = worksheet.Cells[row, 2].Value.ToString();
        game.AddTime = DateTime.ParseExact(worksheet.Cells[row, 3].Value.ToString(), "yyyy/M/d H:mm:ss", null);
        game.Price = decimal.Parse(worksheet.Cells[row, 4].Value.ToString());
        game.Issue = worksheet.Cells[row, 5].Value.ToString();
        game.Type = worksheet.Cells[row, 6].Value.ToString();
        game.Describe = worksheet.Cells[row, 7].Value.ToString();
        game.Status = worksheet.Cells[row, 8].Value.ToString() == "下架" ? 0 : 1; //下架 0 ，正常 1
        int rs = conn.AddGame(game);
        if (rs < 0) { return; }
        importCounts++;
        MessageBox.Show(game.GameName + "导入成功!");
    }
    MessageBox.Show("共计导入"+importCounts);
}