我有以下代码(作为Windows Form的一部分),在我的电脑上可以成功连接到Excel文件,但在另一台电脑上失败了。
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();
}
}
}
行为可以通过使用
OleDbDataAdapter
而不是 OleDbCommand.ExecuteReader()
来重现。using (var dataAdapter = new OleDbDataAdapter(selectStatement, objXConn))
{
dataAdapter.Fill(dataTable);
}
所谓失败,是指在 dataTable.Load(dataReader);
这一行发生以下错误。
在 x86 配置下运行 / 构建程序时,我遇到了以下错误。
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,我在两台机器上都遇到了以下错误。
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)
被用于测试的Excel文件在两台机器上都是相同的。我已经能够使用多个文件(包括 .xls 和 .xlsx)重现该问题。
我已尝试以下措施来解决这个问题: 还可以采取哪些额外步骤来进行故障排除或解决此问题?
SqlDataAdapter
或OleDataAdapter
呢?与其使用Load
,你可以利用Fill()
方法。 - MethodManOleDbDataAdapter
而不是OleDbCommand
来重现它。 - Ryan Gates