System.InvalidOperationException: The Microsoft.Jet.OLEDB.4.0 provider is not

异常描述如下：

System.InvalidOperationException: The 'Microsoft.Jet.OLEDB.4.0' 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, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject)

  at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup)

  at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)

  at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)

  at System.Data.OleDb.OleDbConnection.Open()

  at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)

  at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)

  at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable)

  at Ipms.Server.DataExchange.FileUpLoadHelper.GetDataFromUploadFile(HttpPostedFile postedFile, HttpContext context, String tableName) in D:\Ipms.Server.DataExchange\FileUpLoadHelper.cs:line 50

  at Ipms.Server.DataExchange.ConstructPlanDeviceImport.ConstructPlanDeviceImport.ImportConstructPlanDevice(HttpContext httpContext, HttpPostedFile postedFile, HttpRequest request, Int32 deviceReportID) in D:\ConstructPlanDeviceImport.cs:line 48

  at Ipms.WebSite.Service.Office985.OfficeConstructWebService.DeviceImport() in D:\OfficeConstruct.asmx.cs:line 125

原因：OleDb驱动的版本是32位的，而IIS服务器系统的位数为64位。

解决办法：在Application Pools 中配置Enable 32-bit Applications 为True