Visual Basic

19-Dec-06 12:46

Does anybody know of a simple way to make a shallow clone of an object in vb.net? If anybody has a code example that would also be usefull.

thanks,

Mike

http://msdn2.microsoft.com/en-us/library/system.object.memberwiseclone.aspx[^]

Keith Malwitz19-Dec-06 13:32

Keith Malwitz

19-Dec-06 13:32

MikeMarq19-Dec-06 14:18

19-Dec-06 14:18

Thank you for that link Keith. But I'm getting an error when I try to do the same thing with my object that says this:

Object.Protected Function MemberwiseClone() As Object' is not accessible in this context because it is 'Protected'

Here is the line in my code based on the msdn example that's causing the error:

newobj.PartAtom = CType(oldobj.PartAtom.memberwiseclone,PartAtomCLS)

If anybody has any ideas on what is causing an error please let me know.

thanks,

Mike

Andre L.A.C Bittencourt19-Dec-06 14:48

Andre L.A.C Bittencourt

19-Dec-06 14:48

Hi MikeMarq,

Perhaps its because you are not calling the MemberwiseClone() method within its class or by a derived class. Remember that a protected member is accessible within its class and by a derived classes.

Andre Luiz de Alcântara Chaves Bittencourt

MikeMarq19-Dec-06 17:49

19-Dec-06 17:49

Your suggestions fixed it. Thank you guys for your help. Smile | :)

Typing Tuition Program in VB.NET

Keith Malwitz19-Dec-06 17:45

Keith Malwitz

19-Dec-06 17:45

The previous poster is dead-on.

You will need to write a function in your class that implements the ICloneable.Clone.

For example:

Public Class MyClass

Public Function Clone() as Object Implements ICloneable.Clone
Return Me.MemberwiseClone()
End Function

End Class

You can then call the Clone function from outside the class to create a shallow copy of your type.

aotomating Word doc

rey195119-Dec-06 7:54

rey1951

19-Dec-06 7:54

I have a 3 page Word doc containing VB text boxes on every page.

I would like to automate filling these text boxes thru a VB.net program.

How do I go about it?

Thanks

Rey

harveyhanson19-Dec-06 6:30

harveyhanson

19-Dec-06 6:30

Hi,
I used to do VB 6 programming at college, and now I have to do a project for uni in VB.NET2005. The program is going to be a typing tuition program, with a few tests such as entering the write letter, all very simple kid oriented stuff.

I was just wondering, am I going to struggle with VB.NET 2005 as I have not used it before, or should I be ok picking it up, what are the major differences?

Any tips on programming this, as I have not got that much of an idea at the moment!

Cheeky, but has anyone got any source code or anything like that for a similar program???

Many thanks

The ANZAC19-Dec-06 10:24

The ANZAC

19-Dec-06 10:24

There are quite a few differences, but i doubt you struggle if you've got previous experience. It's not like learning a new language, it's more like moving house, things are just different. Not in a complicated way though.

e.g. instead of setting listbox style to have checked items, you have a checked list box now.

I guarantee you will pick it up in no time.

My tip for your program:
Start studying up on keypress, keydown, keyup and how to use them.

Don't start a new thread on this site, just keep this one running and ask different questions.

Short Keydown Intro:
Say you want to know if they pressed f then do something if they did:
if e.keycode = keys.f then
'do something
end if

Posted by The ANZAC

MikeMarq19-Dec-06 13:30

19-Dec-06 13:30

I used vb5 before I switched to vb.net 2005. I'd say that vb.net is more powerfull but slightly harder to use but not dramatically harder. I wouldn't expect that you would have any problems picking it up. I'd say vb.net is better if you are doing any somewhat complicated program especialy if it is object oriented. Here would be my list of pluses and negatives.

Plus:

1 better at object oriented stuff
2 an extensive library that I think is identical to the one in c# and c++. It lets you do a some things that were hard or impossible to do in earlier vbs.
3 The intellisense is better than the one in vb5 (I never used vb6 so I can't speek for that).

Negative:

1 have to declare ALL variables
2 arrays have to start at zero (no base 1)
3 theres no simple built in one word functions. Instead you use the class library and create an object from a class then use it. This is more capable generally but its not quite as simple use.

They also changed a few other things like some of the data types. For instance int is now 32 bit instead of 16.

Paul Conrad19-Dec-06 13:38

Paul Conrad

19-Dec-06 13:38

MikeMarq wrote:
1 have to declare ALL variables
2 arrays have to start at zero (no base 1)
3 theres no simple built in one word functions. Instead you use the class library and create an object from a class then use it. This is more capable generally but its not quite as simple use.

I wouldn't say these are all negative...

Some people have a memory and an attention span, you should try them out one day. - Jeremy Falcon

MikeMarq19-Dec-06 14:39

19-Dec-06 14:39

1 & 2 are. They used to be optional and you could do things either way. Now you can only do it one way. 3 is a tradeoff. The new way is more powerfull but slightly more complicated so in some cases its better and some cases its worse.

Paul Conrad19-Dec-06 15:07

Paul Conrad

19-Dec-06 15:07

MikeMarq wrote:
1 & 2 are.

I disagree. Why is being required to declare variables negative? It prevents sloppy code. Zero based, granted it is not a natural starting point like 1, has it reasons.

Some people have a memory and an attention span, you should try them out one day. - Jeremy Falcon

Steven J Jowett19-Dec-06 22:48

Steven J Jowett

19-Dec-06 22:48

MikeMarq wrote:
Negative:

1 have to declare ALL variables

Surely this is a positive, as it enforces good coding practises?

Steve Jowett