When trying to 'Perform' an upgrade, DataObjects.NET fails with:

Upgrade of assembly 'ProjectName' from version '' to '1.0.4189.27538' is not supported.

Take note that only the version of the assembly has changed - none of the source files were relocated / modified.

If I manually change the 'Version' of the entry in Metadata.Assembly, everything works again as expected, but this isn't really a good way to upgrade in the future...

Any idea what is going on? The exception thrown didn't tell me why it is not supported, so I'm clueless.

asked Jun 21 '11 at 10:36

TimM's gravatar image


2 Answers:
public class Upgrader : UpgradeHandler
        /// <summary>
        /// Determines whether this handler can upgrade the assembly
        ///             from the specified version of it.
        /// </summary>
        /// <param name="oldVersion">The old assembly version.</param>
        /// <returns>
        /// <see langword="true"/> if this instance can upgrade 
        ///             from the specified version of an old assembly; 
        ///             otherwise, <see langword="false"/>.
        /// </returns>
        public override bool CanUpgradeFrom(string oldVersion)
            //return oldVersion.StartsWith("3.0.0");
            return true;

answered Jun 23 '11 at 03:43

xumix's gravatar image


You are right, I was a bit hasty.

(Jun 23 '11 at 04:23) olorin olorin's gravatar image

You need to create an UpgradeHandler class for your assembly.

The details are in the manual (URL http://help.dataobjects.net/##DataObjects.Net%20v4.4/html/34aeb6cd-61e8-4db2-88f8-1eff2031f103.htm )

In your case you will need just an empty upgrade handler.

public class Upgrader : UpgradeHandler


answered Jun 22 '11 at 03:56

olorin's gravatar image


reverted Jun 22 '11 at 05:17

Dmitri%20Maximov's gravatar image

Dmitri Maximov

I thought it would work, but the same issue remained.

I put the UpgradeMode to Recreate, ran the app : worked.

Then put it back to 'Perform', made sure the assembly version increased, and again it tells me that the upgrade is not supported.

I do have the code posted above in my project now, and still the issue remains.

Any other ideas?

(Jun 22 '11 at 14:42) TimM TimM's gravatar image

See xumix answer : I have forgotten an important part!

(Jun 23 '11 at 04:24) olorin olorin's gravatar image
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