I have the following code (part of a Windows Form) which connects to an Excel file successfully on my machine, but on a different box it fails.
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();
}
}
}
The behavior is reproducible using the OleDbDataAdapter rather than the OleDbCommand.ExecuteReader().
using (var dataAdapter = new OleDbDataAdapter(selectStatement, objXConn))
{
dataAdapter.Fill(dataTable);
}
By failure, I mean getting the following error happens on the line dataTable.Load(dataReader);
When running/building the program with x86 configuration, I get the following error.
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)
When running/building the program with AnyCPU/x64 configuration, I get the following error on both machines.
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)
The Excel file being used for testing is the same file on both machines. I have been able to reproduce the issue with multiple files (both .xls ans .xlsx).
I have tried the following things to remedy the issue.
What additional steps can I take to troublehsoot or resolve this issue?
For first problem use OleDbDataAdapter and Fill() method or 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);
}
The OLEDB drivers for 32-bit and 64-bit applications are different.
If you only have the 32-bit driver installed, then 64-bit applications attempt to use it will get this error: Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine. Similarly, if you have only the 64-bit version installed and 32-bit applications attempt to use it will get this error.
To understand what is happening you should check what is your application. I think this line line will help: Environment.Is64BitProcess
If the problem happens with xls(Excel 2003) file try to use JET connection string !
EDIT: Here is the link for both drivers: