OleDbException (0x80004005)：未知

Question

我有以下代码( Windows窗体的一部分)，它成功地连接到我的计算机上的Excel文件，但是在另一个框中它失败了。

var fd = new OpenFileDialog();
if (fd.ShowDialog() == DialogResult.OK)
{
    var extendedProperties = string.Empty;
    if (fd.FileName.Contains(".xlsx"))
    {
        // excel 2007 xml format file, IMEX = import data as text avoids data conversion errors
        extendedProperties = "Excel 12.0 Xml;IMEX=1";
    }
    else if (fd.FileName.Contains(".xls"))
    {
        // excel 2003 format file, IMEX: import data as text avoids data conversion errors
        extendedProperties = "Excel 8.0;IMEX=1";
    }

    var connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source='" + fd.FileName + "';Extended Properties='" + extendedProperties + "'";
    using (var objXConn = new OleDbConnection(connectionString))
    {
        objXConn.Open();

        var selectStatement = string.Format("SELECT * FROM [tabName$] WHERE FormType IS NOT NULL");
        var dataTable = new DataTable("test");
        using (var objCommand = new OleDbCommand(selectStatement, objXConn))
        {
            var dataReader = objCommand.ExecuteReader();
            if (dataReader != null)
            {
                dataTable.Load(dataReader);
            }
        }
        using (var stringWriter = new StringWriter())
        {
            dataTable.WriteXml(stringWriter);
            this.textBox1.Text = stringWriter.ToString();
        }
    }
}

使用OleDbDataAdapter而不是OleDbCommand.ExecuteReader()，行为是可重复的。

using (var dataAdapter = new OleDbDataAdapter(selectStatement, objXConn))
{
    dataAdapter.Fill(dataTable);
}

所谓失败，我的意思是在行dataTable.Load(dataReader);上发生以下错误

在使用x86配置运行/构建程序时，我会得到以下错误。

System.Data.OleDb.OleDbException (0x80004005): Unknown
   at System.Data.OleDb.OleDbDataReader.ProcessResults(OleDbHResult hr)
   at System.Data.OleDb.OleDbDataReader.GetRowHandles()
   at System.Data.OleDb.OleDbDataReader.ReadRowset()
   at System.Data.OleDb.OleDbDataReader.Read()
   at System.Data.Common.DataAdapter.FillLoadDataRow(SchemaMapping mapping)
   at System.Data.Common.DataAdapter.FillFromReader(DataSet dataset, DataTable datatable, String srcTable, DataReaderContainer dataReader, Int32 startRecord, Int32 maxRecords, DataColumn parentChapterColumn, Object parentChapterValue)
   at System.Data.Common.DataAdapter.Fill(DataTable[] dataTables, IDataReader dataReader, Int32 startRecord, Int32 maxRecords)
   at System.Data.Common.LoadAdapter.FillFromReader(DataTable[] dataTables, IDataReader dataReader, Int32 startRecord, Int32 maxRecords)
   at System.Data.DataTable.Load(IDataReader reader, LoadOption loadOption, FillErrorEventHandler errorHandler)
   at ExcelTest.Form1.button1_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

在使用AnyCPU/x64配置运行/构建程序时，在这两台计算机上都会出现以下错误。

System.InvalidOperationException: The 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine.
   at System.Data.OleDb.OleDbServicesWrapper.GetDataSource(OleDbConnectionString constr, DataSourceWrapper& datasrcWrapper)
   at System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection)
   at System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject)
   at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at System.Data.ProviderBase.DbConnectionInternal.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
   at System.Data.OleDb.OleDbConnection.Open()
   at ExcelTest.Form1.button1_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

用于测试的Excel文件在两台机器上都是相同的文件。我已经能够用多个文件(都是.xls和.xlsx)来重现这个问题。

我尝试了以下几种方法来解决这个问题。

• 安装“Microsoft.ACE.OLEDB.12.0”提供程序未在本地计算机上注册中描述的组件
• 将项目配置为x86/x64
• 卸载和重新安装2007 Office系统驱动程序:数据连接组件
• 卸载和重新安装Microsoft数据库引擎2010可再发行

我还能采取什么其他措施来解决这个问题呢？

Answer 1

对于第一个问题，请使用OleDbDataAdapter和Fill()方法或Update()。

        DataTable newTbl = new DataTable()
        using(OleDbDataAdapter ad = new OleDbDataAdapter(
            @"SELECT * FROM [tabName$] WHERE FormType IS NOT NULL", objXConn))
        {
           OleDbCommandBuilder builder = new OleDbCommandBuilder(ad);

           builder.QuotePrefix = "[";
           builder.QuoteSuffix = "]";

           // Saves the data set
           ad.Update(newTbl);
        }

32位和64位应用程序的OLEDB驱动程序是不同的。

如果您只安装了32位驱动程序，那么64位应用程序尝试使用它将得到以下错误：Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine。类似地，如果您只安装了64位版本，并且尝试使用32位应用程序，则会得到此错误。

要理解正在发生的事情，您应该检查您的应用程序是什么。我认为这一行会有帮助：Environment.Is64BitProcess

如果xls(Excel2003)文件出现问题，请尝试使用JET连接字符串!

编辑：这里是两个驱动程序的链接