Deserialization Casting Exception After Project Rebuild

[Dave L]

I am using a stream and binary formatter to store data onto the disk.

BinaryFormatter formatter = new BinaryFormatter();
formatter.Serialize(stream, header);
formatter.Serialize(stream, data);

Later I read the data back:

BinaryFormatter formatter = new BinaryFormatter();
header = (Header)formatter.Deserialize(stream);
playbackData = (ArrayList)formatter.Deserialize(stream);

I then obtain an instance from my array:

Message msg = (Message)playbackData[0];

This all works, until I rebuild my application and try to read a previously
stored file on the disk drive. As soon as I rebuild, opening any file
created with the previous build generates a: "System.InvalidCastException -
Specified cast is not valid" on the above line.

I can see all the data from within the ArrayList and its correct. The
GetType() returns the correct type. But casting causes an exception. Why?

Of note: The data type I'm storing in the ArrayList is managed C++ and
within a DLL. The DLL is in the GAC. All the above code is C#. Should make a
difference, right?

Thanks in advance for the help.

 

[Dave L]

Never mind. Fixed it.

Tricky little problem...

 

[Dave L]

For future posterity, the problem stems from the auto incrementing assembly
version:

[assembly: AssemblyVersion("1.0.*")]

Hard code the version to fix.

http://blogs.gotdotnet.com/suzcook/commentview.aspx/cc6428d6-69fb-4f05-8f18-65f3eac85274

http://groups.google.com/groups?hl=...qTtNQ2ZDHA.1940%40TK2MSFTNGP10.phx.gbl&rnum=3