我有以下代码(
Windows窗体的一部分),它在我的机器上成功连接到Excel文件,但在另一个盒子上失败.
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()可以重现该行为.
using (var dataAdapter = new OleDbDataAdapter(selectStatement,objXConn))
{
dataAdapter.Fill(dataTable);
}
失败,我的意思是在dataTable.Load(dataReader)行上发生以下错误;
使用x86配置运行/构建程序时,出现以下错误.
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 maxRecords) at System.Data.Common.LoadAdapter.FillFromreader(DataTable[] dataTables,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)
使用Anycpu / x64配置运行/构建程序时,我在两台计算机上都出现以下错误.
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,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,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,IntPtr lparam)
用于测试的Excel文件在两台计算机上都是相同的文件.我已经能够使用多个文件(.xls ans .xlsx)重现该问题.
>安装‘Microsoft.ACE.OLEDB.12.0’ provider is not registered on the local machine中描述的组件
>将项目配置为x86 / x64
>卸载并重新安装2007 Office System Driver: Data Connectivity Components
>卸载并重新安装Microsoft Access Database Engine 2010 Redistributable
解决方法
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);
}
用于32位和64位应用的OLEDB驱动程序是不同的.
如果您只安装了32位驱动程序,则64位应用程序尝试使用它将收到此错误：Microsoft.ACE.OLEDB.12.0’提供程序未在本地计算机上注册.同样,如果您只安装了64位版本并且32位应用程序尝试使用它,则会出现此错误.
要了解发生了什么,您应该检查您的应用程序是什么.我认为这一行可以提供帮助：Environment.Is64BitProcess
如果xls(Excel 2003)文件出现问题,请尝试使用JET连接字符串！
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