将数据集导出到 EXCEL

我使用以下代码将数据库表中的字段导出到 Excel 中。我想要做的是能够编写一条 SQL 语句从多个表中检索字段并将其导出到 Excel 中。这段代码只允许我导出一张表。另外，如何显示保存提示对话框？示例代码将不胜感激 - 非常感谢！

protected void export_Click(object sender, EventArgs e)
{

        string sql = null;
        string data = null;
        string path = save_as.Text;

        int i = 0;
        int j = 0;

        Excel.Application xlApp;
        Excel.Workbook xlWorkBook;
        Excel.Worksheet xlWorkSheet;
        object misValue = System.Reflection.Missing.Value;

        xlApp = new Excel.ApplicationClass();
        xlWorkBook = xlApp.Workbooks.Add(misValue);
        xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);

        //connectionString = "data source=servername;initial catalog=databasename;user id=username;password=password;";
        SqlConnection cnn = new SqlConnection(GetConnectionString());
        cnn.Open();
        sql = "SELECT Story, CreationDate FROM Story";
        SqlDataAdapter dscmd = new SqlDataAdapter(sql, cnn);
        DataSet ds = new DataSet();
        dscmd.Fill(ds);

        for (i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
        {
            for (j = 0; j <= ds.Tables[0].Columns.Count - 1; j++)
            {
                data = ds.Tables[0].Rows[i].ItemArray[j].ToString();
                xlWorkSheet.Cells[i + 1, j + 1] = data;
            }
        }

        xlWorkBook.SaveAs(path+".xls", Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
        xlWorkBook.Close(true, misValue, misValue);
        xlApp.Quit();

        releaseObject(xlWorkSheet);
        releaseObject(xlWorkBook);
        releaseObject(xlApp);

        //MessageBox.Show("Excel file created , you can find the file c:\\csharp.net-informations.xls");
    }

    private void releaseObject(object obj)
    {
        try
        {
            System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
            obj = null;
        }
        catch (Exception ex)
        {
            obj = null;
            //MessageBox.Show("Exception Occured while releasing object " + ex.ToString());
        }
        finally
        {
            GC.Collect();
        }
    }

在 ASP.NET 环境中执行办公自动化并不安全。相反，您应该生成 csv、html 表或 xlsx 文件并将其发送给客户端。对于 xlsx，您可以使用 Office Open XML SDK 来稍微简化一些事情。