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Cannot connect to a DBF file via oleDbConnection
Message
Information générale
Forum:
ASP.NET
Catégorie:
ADO.NET
Divers
Thread ID:
00672175
Message ID:
00675666
Vues:
17
Just tried regsvr32 and it still doesn't work...

>It sounds like the OLEDB provider is not registered correctly. Locate your VFPOLEDB.DLL file and register it with regsvr32. The installer may have had trouble installing it.
>
>>I do not have this problem when running the Web Service below on a machine with VFP 7 installed.
>>
>>Do I have to do something special to register the VFP OLEDB Provider on a target machine that does not have VFP 7 installed?
>>
>>I applied VFP7SP1 and re-booted prior to generating an InstallShield installer with the VFP OLEDB Provider merge module.
>>
>>What am I doing wrong?
>>
>>>I have installed the VFP OleDB Provider and I can access a free DBF table after dragging the OleDbConnection and OleDbDataAdapter objects onto my C# WebService project design pannel and generate a DataSet.
>>>
>>>However, I cannot access the free table via a DataReader object.
>>>
>>>My WebService has the following code:
>>>
>>> [WebMethod]
>>> public string GetLastPrefix()
>>> {
>>> string sqlString;
>>> string lastPrefix;
>>>
>>> OleDbCommand sqlCmd = new OleDbCommand();
>>>
>>> sqlString = "SELECT cPrefix FROM bsreg";
>>> sqlCmd.CommandType = CommandType.Text;
>>> sqlCmd.CommandText = sqlString;
>>> sqlCmd.Connection = xOleDbConn;
>>>
>>> // Init lastPrefix to ""
>>> lastPrefix = "";
>>>
>>> xOleDbConn.Open();
>>>
>>> OleDbDataReader dr = sqlCmd.ExecuteReader();
>>> if (dr.Read())
>>> lastPrefix = dr[0].ToString();
>>>
>>> xOleDbConn.Close();
>>>
>>> return lastPrefix;
>>> }
>>>
>>>And I get the following error when I invoke the WebService:
>>>
>>>System.InvalidOperationException: The 'VFPOLEDB.1' provider is not registered on the local machine. ---> System.Data.OleDb.OleDbException: No error information available: REGDB_E_CLASSNOTREG(0x80040154).
>>> --- End of inner exception stack trace ---
>>> at System.Data.OleDb.OleDbConnection.CreateProviderError(Int32 hr)
>>> at System.Data.OleDb.OleDbConnection.CreateProvider()
>>> at System.Data.OleDb.OleDbConnection.Open()
>>> at wsBSSN.BSSN.GetLastPrefix() in d:\develop\net\bssn\wsbssn\bssn.asmx.cs:line 96
>>>
>>>
>>>Line 96 points to: xOleDbConn.Open();
>>>
>>>I'm not getting any compile errors.
>>>
>>>Does the VFP OleDb Provider work with the DataReader object?
>>>
>>>
>>>>You need to use the OLEDB provider that ships with VFP7 not ODBC. There are samples available about how to access VFP data using ADO.NET in the following whitepaper:
>>>>
>>>>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnfoxgen7/html/usingaspnetwithvfp7.asp
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