2021-01-12 10:39:58:下载出错！   在 System.Data.Common.UnsafeNativeMethods.IDBInitializeInitialize.Invoke(IntPtr pThis)
   在 System.Data.OleDb.DataSourceWrapper.InitializeAndCreateSession(OleDbConnectionString constr, SessionWrapper& sessionWrapper)
   在 System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection)
   在 System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject)
   在 System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup)
   在 System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)
   在 System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
   在 System.Data.OleDb.OleDbConnection.Open()
   在 CL.DBUtility.OleDbHelper.tQdud6N4pwbrq1ARVL0(Object )
   在 CL.DBUtility.OleDbHelper.PrepareCommand(Object command, Object connection, Object transaction, CommandType commandType, Object commandText, Object commandParameters, Boolean& mustCloseConnection)
   在 CL.DBUtility.OleDbHelper.ExecuteScalar(OleDbConnection connection, CommandType commandType, String commandText, OleDbParameter[] commandParameters)
   在 CL.DBUtility.OleDbHelper.ExecuteScalar(OleDbConnection connection, CommandType commandType, String commandText)
   在 CL.DAL.BaseData.wP0iEjQxCwYRoxLmgW(Object , CommandType , Object )
   在 CL.DAL.BaseData.ExecuteScalar(String commandText)
   在 CL.BLLClient.ClientDataExchange.DownloadCourse(DataTable tblupdate, Boolean deleteItemFirst, DBCommandItemCollection& dbCommandItems)
   在 CL.BLLClient.ClientDataExchange.DownloadBaseItem(String versionCode, String itemName, Boolean deleteItemFirst, String localupdatedate, String remoteupdatedate)
   在 CL.BLLClient.ClientDataExchange.DownloadBaseItem(String itemName, Boolean deleteItemFirst, String localupdatedate, String remoteupdatedate)
   在 CL.ExamClient.frmMain.dIZXGVI24yCO2pp0O2uK(Object , Object , Boolean , Object , Object )
   在 CL.ExamClient.frmMain.StartDownLoadBaseItemFromServer(Object state)
2021-01-12 10:46:18:下载出错！   在 System.Net.UnsafeNclNativeMethods.OSSOCK.recv(IntPtr socketHandle, Byte* pinnedBuffer, Int32 len, SocketFlags socketFlags)
   在 System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, SocketError& errorCode)
   在 System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   在 System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   在 System.Net.PooledStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   在 System.Net.Connection.SyncRead(HttpWebRequest request, Boolean userRetrievedStream, Boolean probeRead)
   在 System.Net.ConnectStream.ProcessWriteCallDone(ConnectionReturnResult returnResult)
   在 System.Net.HttpWebRequest.WriteCallDone(ConnectStream stream, ConnectionReturnResult returnResult)
   在 System.Net.ConnectStream.CallDone(ConnectionReturnResult returnResult)
   在 System.Net.ConnectStream.ResubmitWrite(ConnectStream oldStream, Boolean suppressWrite)
   在 System.Net.HttpWebRequest.EndWriteHeaders_Part2()
   在 System.Net.HttpWebRequest.EndWriteHeaders(Boolean async)
   在 System.Net.HttpWebRequest.WriteHeadersCallback(WebExceptionStatus errorStatus, ConnectStream stream, Boolean async)
   在 System.Net.ConnectStream.WriteHeaders(Boolean async)
   在 System.Net.HttpWebRequest.EndSubmitRequest()
   在 System.Net.HttpWebRequest.CheckDeferredCallDone(ConnectStream stream)
   在 System.Net.HttpWebRequest.GetResponse()
   在 System.Web.Services.Protocols.WebClientProtocol.GetWebResponse(WebRequest request)
   在 System.Web.Services.Protocols.HttpWebClientProtocol.GetWebResponse(WebRequest request)
   在 System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
   在 CL.BLLClient.ExamClientService.ExamClientService.LoadTableImage(String tableName, String sourceId)
   在 CL.BLLClient.ClientDataExchange.DownloadTableImage(String tableName, String sourceId, DBCommandItemCollection& dbCommandItems)
   在 CL.BLLClient.ClientDataExchange.DownloadCourse(DataTable tblupdate, Boolean deleteItemFirst, DBCommandItemCollection& dbCommandItems)
   在 CL.BLLClient.ClientDataExchange.DownloadBaseItem(String versionCode, String itemName, Boolean deleteItemFirst, String localupdatedate, String remoteupdatedate)
   在 CL.BLLClient.ClientDataExchange.DownloadBaseItem(String itemName, Boolean deleteItemFirst, String localupdatedate, String remoteupdatedate)
   在 CL.ExamClient.frmMain.dIZXGVI24yCO2pp0O2uK(Object , Object , Boolean , Object , Object )
   在 CL.ExamClient.frmMain.StartDownLoadBaseItemFromServer(Object state)
2021-01-12 10:50:05:下载出错！   在 System.Net.UnsafeNclNativeMethods.OSSOCK.recv(IntPtr socketHandle, Byte* pinnedBuffer, Int32 len, SocketFlags socketFlags)
   在 System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, SocketError& errorCode)
   在 System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   在 System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   在 System.Net.PooledStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   在 System.Net.Connection.SyncRead(HttpWebRequest request, Boolean userRetrievedStream, Boolean probeRead)
   在 System.Net.ConnectStream.ProcessWriteCallDone(ConnectionReturnResult returnResult)
   在 System.Net.HttpWebRequest.WriteCallDone(ConnectStream stream, ConnectionReturnResult returnResult)
   在 System.Net.ConnectStream.CallDone(ConnectionReturnResult returnResult)
   在 System.Net.ConnectStream.ResubmitWrite(ConnectStream oldStream, Boolean suppressWrite)
   在 System.Net.HttpWebRequest.EndWriteHeaders_Part2()
   在 System.Net.HttpWebRequest.EndWriteHeaders(Boolean async)
   在 System.Net.HttpWebRequest.WriteHeadersCallback(WebExceptionStatus errorStatus, ConnectStream stream, Boolean async)
   在 System.Net.ConnectStream.WriteHeaders(Boolean async)
   在 System.Net.HttpWebRequest.EndSubmitRequest()
   在 System.Net.HttpWebRequest.CheckDeferredCallDone(ConnectStream stream)
   在 System.Net.HttpWebRequest.GetResponse()
   在 System.Web.Services.Protocols.WebClientProtocol.GetWebResponse(WebRequest request)
   在 System.Web.Services.Protocols.HttpWebClientProtocol.GetWebResponse(WebRequest request)
   在 System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
   在 CL.BLLClient.ExamClientService.ExamClientService.LoadTableImage(String tableName, String sourceId)
   在 CL.BLLClient.ClientDataExchange.DownloadTableImage(String tableName, String sourceId, DBCommandItemCollection& dbCommandItems)
   在 CL.BLLClient.ClientDataExchange.DownloadCourse(DataTable tblupdate, Boolean deleteItemFirst, DBCommandItemCollection& dbCommandItems)
   在 CL.BLLClient.ClientDataExchange.DownloadBaseItem(String versionCode, String itemName, Boolean deleteItemFirst, String localupdatedate, String remoteupdatedate)
   在 CL.BLLClient.ClientDataExchange.DownloadBaseItem(String itemName, Boolean deleteItemFirst, String localupdatedate, String remoteupdatedate)
   在 CL.ExamClient.frmMain.dIZXGVI24yCO2pp0O2uK(Object , Object , Boolean , Object , Object )
   在 CL.ExamClient.frmMain.StartDownLoadBaseItemFromServer(Object state)
