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  NDO-Forum postings in english please, if possible.  Developing with NDO  Error while try...
 Error while trying to Get List.
 
 8/14/2006 3:51:41 PM
mz
1 posts


Error while trying to Get List.
 Modified By mz on 8/14/2006 3:55:01 PM)
Hi everybody,
great software, but while trying I got this error: I did the example.
Writing to database was easy and great. But for getting data back from database I always get an error: The code I used is:
The persistence Class I used is Client.cs my code for writing was:
PersistenceManager pm = new PersistenceManager();
Client cl = new Client(); cl.FirstName = "Martin";
cl.LastName = "Zeug"; cl.EMail = "martin.zeug@meez.de";
cl.Admin = 1; cl.Password = "test";
pm.BuildDatabase();
pm.MakePersistent(cl);
pm.Save();
My code for Reading is:
PersistenceManager pm = new PersistenceManager();
NDOQuery query = new NDOQuery(pm);
List lstClient = query.Execute();
foreach (Client e in lstClient)
Console.WriteLine(lstClient[0].LastName + ", " + lstClient[0].FirstName);

The error I always get is: "Der Objektverweis wurde nicht auf ein Objektinstanz festgelegt".
the error occours at : List lstClient = query.Execute();
I did everything like in the video tutorial. Thanks Martin
 8/14/2006 7:06:42 PM
Support
5 posts


Re: Error while trying to Get List.
 Modified By admin on 8/16/2006 1:54:29 PM)

Hello Martin, as the parameter for your NDOquery you have to enter the generic parameter type of your persistent class (for .NET 2.0) , in your example 'Client'.

So your query should look like this:

NDOQuery<Client> query = new NDOQuery<Client>(pm);
List<Client> lstClient = query.Execute();

So you get a typed list of your Client objects.
Look also at the examples under "How NDO works - Queries" in this website.

Regards NDO Support

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