Variable type Object, assign to a Class at runtime

[Andres]

Hi all,

I have the problem to assign a variable of type object to
a specific class at runtime. I want to use a string
variable that specify the class a want to set this object.

Is something similar to add a new control to a form using
the controls collection:

Private Sub CommandCreateInstance_Click()
Dim newInstance As Object
Dim strClass as String

strClass = "aClass"

Set newInstance = Me.Controls.Add("VB." & strClass,
newInstanceName, Me)

End Sub

In the example 'aClass' is a Class I made as a Class
module, but with custom classes doesn't work, it has to be
a Control registered in VB.

Has anybody any idea to do this.

Thanks

 

[Armin Zingler]

Hi all,

I have the problem to assign a variable of type object to
a specific class at runtime.

You can not assign an object to a class. You can assign an object to a
variable with a certain type.

I want to use a string
variable that specify the class a want to set this object.

The string contains the class name? Where, when and how do you create the
object?

Is something similar to add a new control to a form using
the controls collection:

Private Sub CommandCreateInstance_Click()
Dim newInstance As Object
Dim strClass as String

strClass = "aClass"

Set newInstance = Me.Controls.Add("VB." & strClass,
newInstanceName, Me)

End Sub

In the example 'aClass' is a Class I made as a Class
module, but with custom classes doesn't work, it has to be
a Control registered in VB.

Has anybody any idea to do this.

I am not sure if it helps, but have a look at Activator.Createinstance.

 

[Jay B. Harlow [MVP - Outlook]]

Andres,

Where can I find this Activator and what is it?

Its a class in the system namespace

System.Activator

http://msdn.microsoft.com/library/d...cpref/html/frlrfSystemActivatorClassTopic.asp

Hope this helps
Jay

-----Original Message-----


You can not assign an object to a class. You can assign an object to a
variable with a certain type.

Ok, may be I didn't describe very well what I try to
do... I declare a variable as Object type

Dim newInstance as Object

then at runtime I want newInstance to point to an object
of class 'x' that the user can choose from a set of
classes types displayed in a combobox or whatever. So when
the user clicks the button insert new object the procedure
should receive a class name as a string variable, then
should create the object of class 'x' and should store the
reference in a collection of objects somewhere.

object.

The string contains the class name? Where, when and how do you create the
object?



I am not sure if it helps, but have a look at Activator.Createinstance.

Where can I find this Activator and what is it?

Andres

 

[Armin Zingler]

Ok, may be I didn't describe very well what I try to
do... I declare a variable as Object type

Dim newInstance as Object

then at runtime I want newInstance to point to an object
of class 'x' that the user can choose from a set of
classes types displayed in a combobox or whatever. So when
the user clicks the button insert new object the procedure
should receive a class name as a string variable, then
should create the object of class 'x' and should store the
reference in a collection of objects somewhere.

The mentioned activator class should solve this problem.

Where can I find this Activator and what is it?

where: in the object browser, by using the symbol search or in the docs.
what it is: what you are looking for.

 

[Herfried K. Wagner [MVP]]

Hello,

I have the problem to assign a variable of type object to
a specific class at runtime. I want to use a string
variable that specify the class a want to set this object.

Are you sure you are talking about VB.NET?