StrataFrame Forum / StrataFrame Application Framework / WebForms (How do I?) / Using DataBaseMigrator class in a web form / Latest Posts

RE: Using DataBaseMigrator class in a web form

Ben Chase — Thu, 17 Jan 2008 09:19:25 GMT

Hehe, glad it worked for you :)

RE: Using DataBaseMigrator class in a web form

Keith Chisarik — Thu, 17 Jan 2008 09:15:06 GMT

Ben you sir, ARE THE MAN!!!!

/bow

Thanks a lot that worked great.

Keith

RE: Using DataBaseMigrator class in a web form

Keith Chisarik — Thu, 17 Jan 2008 09:11:05 GMT

I tried NOTHING yesterday (good to know I'm on the same page here) and it does error. I will try this thanks Ben.

RE: Using DataBaseMigrator class in a web form

Ben Chase — Thu, 17 Jan 2008 09:06:41 GMT

You might be able to pass Nothing as the parameter. If that errors out (with a NullReference exception), then just create your own class that implements ISynchronizeInvoke. Simply return True out of the InvokeRequired property, and in the Invoke() method, simply call DynamicInvoke on the method. We don't use the Begin- or EndInvoke:

Public Class CustomSynchronizeInvoke
Implements System.ComponentModel.ISynchronizeInvoke

Public Function BeginInvoke(ByVal method As System.Delegate, ByVal args() As Object) As System.IAsyncResult Implements System.ComponentModel.ISynchronizeInvoke.BeginInvoke
Throw New NotSupportedException()
End Function

Public Function EndInvoke(ByVal result As System.IAsyncResult) As Object Implements System.ComponentModel.ISynchronizeInvoke.EndInvoke
Throw New NotSupportedException()
End Function

Public Function Invoke(ByVal method As System.Delegate, ByVal args() As Object) As Object Implements System.ComponentModel.ISynchronizeInvoke.Invoke
Return method.DynamicInvoke(args)
End Function

Public ReadOnly Property InvokeRequired() As Boolean Implements System.ComponentModel.ISynchronizeInvoke.InvokeRequired
Get
Return True
End Get
End Property

End Class

RE: Using DataBaseMigrator class in a web form

Keith Chisarik — Thu, 17 Jan 2008 08:22:22 GMT

A decent amount of looking seems to indicate that web controls do no support invoke. Hopefully I am wrong and you can suggest one, otherwise I am open for suggestions as to a workaround/fix.

RE: Using DataBaseMigrator class in a web form

Keith Chisarik — Wed, 16 Jan 2008 19:50:53 GMT

I did try that with a couple different control types, each one errored. I will try it again in the AM and post my results.

Thanks.

RE: Using DataBaseMigrator class in a web form

Trent L. Taylor — Wed, 16 Jan 2008 18:55:09 GMT

You can just create a control and use that as your Sync object. Obviously a web page is not going to have a WinForms object to Sync off of, so just create a Control or an object that supports Invoke and pass it over. This will at least prevent any errors from appearing. Give that a whirl and if that doesn't work then I will try to create a quick sample and play with a workaround. :)

Using DataBaseMigrator class in a web form

Keith Chisarik — Wed, 16 Jan 2008 15:25:11 GMT

How might we do this?

The third parameter is of type ISynchronizeInvoke, in the samples that I used to test it was set to ME which equated to the form, this doesn't work in a web form. I don't need it to do more then one database at a time, just apply a DDT package to create a single new database from the metadata via a web form. I am OK with using a desktop app to update multiple databases later.

Thanks.