C＃＆amp; Access数据库：无法识别的数据库格式

Question

构建一个程序，该程序读取访问数据库文件并导出到excel加载到数据网格中的内容。

它适用于我构建的示例数据库，但不适用于我试图从中提取数据的实际数据库。它们都是using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using Microsoft.Office.Interop.Excel; using System.Threading; using System.Data.OleDb; namespace DataExporter { public partial class Form1 : Form { System.Data.DataTable dt = new System.Data.DataTable(); public Form1() { InitializeComponent(); } private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e) { //List<Product> list = ((DataParameter)e.Argument).ProductList; System.Data.DataTable list = ((DataParameter)e.Argument).ProductList; string filename = ((DataParameter)e.Argument).FileName; Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application(); Workbook wb = excel.Workbooks.Add(XlSheetType.xlWorksheet); Worksheet ws = (Worksheet)excel.ActiveSheet; excel.Visible = false; int index = 1; //int process = list.Count; int process = list.Rows.Count; //Add Column ws.Cells[1, 1] = "Item Number"; ws.Cells[1, 2] = "Model"; ws.Cells[1, 3] = "Manufacturer"; ws.Cells[1, 4] = "Category"; ws.Cells[1, 5] = "Subcategory"; foreach (DataRow dr in list.Rows) { if (!backgroundWorker.CancellationPending) { backgroundWorker.ReportProgress(index++ * 100 / process); ws.Cells[index, 1] = dr.ItemArray[1].ToString(); ws.Cells[index, 2] = dr.ItemArray[2].ToString(); ws.Cells[index, 3] = dr.ItemArray[3].ToString(); ws.Cells[index, 4] = dr.ItemArray[4].ToString(); ws.Cells[index, 5] = dr.ItemArray[5].ToString(); } } //Save file ws.SaveAs(filename, XlFileFormat.xlWorkbookDefault, Type.Missing, Type.Missing, true, false, XlSaveConflictResolution.xlLocalSessionChanges, Type.Missing, Type.Missing); excel.Quit(); } struct DataParameter { public System.Data.DataTable ProductList; public string FileName { get; set; } } DataParameter _inputParameter; private void Form1_Load(object sender, EventArgs e) { string ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Wizard_Data-2016-10-17.accdb"; using (OleDbConnection olcon = new OleDbConnection(ConnectionString)) { using (OleDbDataAdapter adapter = new OleDbDataAdapter()) { string command = "SELECT * FROM [Inventory]"; //cmd.CommandText = "SELECT * FROM [" + sheetName + "]"; OleDbCommand cmd = new OleDbCommand(command, olcon); //Fill Gridview with Data from Access try { dt.Clear(); adapter.SelectCommand = cmd; adapter.Fill(dt); dataGridView1.DataSource = dt; } catch (Exception ex) { MessageBox.Show(ex.ToString()); } finally { olcon.Close(); var totalWidth = dataGridView1.Columns.GetColumnsWidth(DataGridViewElementStates.None); } } } } private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e) { progressBar.Value = e.ProgressPercentage; lblStatus.Text = string.Format("Processing...{0}", e.ProgressPercentage); progressBar.Update(); } private void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { if (e.Error == null) { Thread.Sleep(100); lblStatus.Text = "Your data has been successfully exported."; } } private void btnExport_Click(object sender, EventArgs e) { if (backgroundWorker.IsBusy) return; using (SaveFileDialog sfd = new SaveFileDialog() { Filter = "Excel Workbook|*.xls" }) { if (sfd.ShowDialog() == DialogResult.OK) { _inputParameter.FileName = sfd.FileName; //_inputParameter.ProductList = GetProductsList2(); _inputParameter.ProductList = (System.Data.DataTable)dataGridView1.DataSource; progressBar.Minimum = 0; progressBar.Value = 0; backgroundWorker.RunWorkerAsync(_inputParameter); } } } private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e) { } } } 个文件。

错误讯息：

.mdb

更新
我将访问数据库保存为.accdb格式，程序运行正常。与{{1}}格式有关吗？