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04/22/2009 at 08:05AM PDT, ID: 24345449
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9.1

Loss of object Info during serialization into sql server database in C# csharp .net

Asked by yaronusa in C# Programming Language, Microsoft Visual C#.Net, .NET

Tags: Loss of information casting serialization database c# csharp .net

I think I am experiencing loss of information while serializing an object.
There is an object of type cMasterTest (parent), from which object of type cHP3245A_testParam (child) is derived. In other words, cHP3245A_testParam inherits cMasterTest.

I have been successful in storing nested serialized objects in an sql server database by inserting them into a memory stream, converting to an array of bytes, and storing them in a VARBINARY(MAX) field, and retrieving everything back.

This I would think would be simpler, but it doesn't seem to work: (Step 1) I take my object, explicitly cast it to its parent, then serializing that and storing it in a db. Then I (Step 2) retrieve the serialized object from the db, de-serialize it into the parent object, explicity cast it back to the child object.

Basically, once casting and inheritance is involved, I seem to have loss of information.

Please, if someone knows what is going on, please help me. 
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//*** (1) GET DATA ***\\
 
iHandleTests interfaceToUserControl =
                TDuc as iHandleTests;
 
// Here we are getting cHp3245A casted into cMasterTest and returned via
// the getTestParameters() method.
cMasterTest testParameters = interfaceToUserControl.getTestParameters();
 
/* The retrieval has been successfull because If I explicitly convert testParameters 
to cHP3245A_testParam object at this point there would be no loss of information, 
so I know I received the right data */
 
 
//*** (2) STORE DATA IN DATABASE ***\\
 
ms = new MemoryStream();
bf = new BinaryFormatter();
bf.Serialize(ms, testParameters);
sqlParam_data = new SqlParameter("@data", SqlDbType.VarBinary);
sqlParam_data.Value = ms.ToArray();
// sqlParam is then inserted to database
 
 
//*** (3) RETRIEVE DATA FROM DATABASE ***\\
 
sqlDataReader.Read();
bf = new BinaryFormatter();
ms = new MemoryStream((byte[])sqlDataReader["test_object"]);
cMasterTest cmt = (cMasterTest)bf.Deserialize(ms);
 
// PROBLEM HERE Conversion NOT successful -- Loss of information
cHP3245A_testParam tp = (cHP3245A_testParam)cmt;
[+][-]04/22/09 08:50 AM, ID: 24206261

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[+][-]04/22/09 06:45 PM, ID: 24211207

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[+][-]04/23/09 03:04 AM, ID: 24213300

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[+][-]04/23/09 04:28 AM, ID: 24213809

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[+][-]04/23/09 04:53 AM, ID: 24213981

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Zones: C# Programming Language, Microsoft Visual C#.Net, .NET
Tags: Loss of information casting serialization database c# csharp .net
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Solution Provided By: oobayly
Participating Experts: 1
Solution Grade: A
 
 
[+][-]04/28/09 03:12 PM, ID: 24255677

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[+][-]04/29/09 02:19 AM, ID: 24258485

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