Access to instance objects in different classes

[MikeAth via DotNetMonster.com]

Hi all,
I have two different classes and one instance of the Form.
I would like to access the members of the Form instance in both classes
without having to create a new instance in the other class, because that
would give me access to different members than in the first instance and
would not behave as one global object. How can I do that, any guess?
Thanks.

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Message posted via http://www.dotnetmonster.com

[Cor Ligthert]

Mike,

By passing the referenes for reference types and the value for value types
(which is the standard passing way)

I hope this helps,

Cor

[Joanna Carter \(TeamB\)]

"MikeAth via DotNetMonster.com" <fo***@DotNetMonster.com> a écrit dans le
message de news: 1e******************************@DotNetMonster.com...

I have two different classes and one instance of the Form.
I would like to access the members of the Form instance in both classes
without having to create a new instance in the other class, because that
would give me access to different members than in the first instance and
would not behave as one global object. How can I do that, any guess?

You need the Singleton design pattern.

public class MyClass
{
private static MyClass instance = null;

private MyClass() {}

public static MyClass Instance()
{
if (instance == null)
instance = new MyClass();
return instance;
}
}

Called from either form like this :

{
MyClass formUser = MyClass.Instance();
...
}

Joanna

--
Joanna Carter
Consultant Software Engineer

[MikeAth via DotNetMonster.com]

Thanks, I think that singleton design pattern is exactly what I need. I
just expected such access to be more common and easily usable in C#, but I
hope it will work fine this way.

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Message posted via http://www.dotnetmonster.com

[Jon Skeet [C# MVP]]

Joanna Carter (TeamB) <jo*****@nospamforme.com> wrote:

I have two different classes and one instance of the Form.
I would like to access the members of the Form instance in both classes
without having to create a new instance in the other class, because that
would give me access to different members than in the first instance and
would not behave as one global object. How can I do that, any guess?
You need the Singleton design pattern.

That sounds like a bad idea to me in this case. As Cor said, all the OP
needs is for the reference to the form to be given to both of the other
classes in some way or other, whether it's by calling a method, setting
a property, or passing a reference in the constructor. There's no need
for a singleton.
public class MyClass
{
private static MyClass instance = null;

private MyClass() {}

public static MyClass Instance()
{
if (instance == null)
instance = new MyClass();
return instance;
}
}

That's not a thread-safe way of implementing a singleton. See
http://www.pobox.com/~skeet/csharp/singleton.html

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too