Default values and form inheritace

[Olaf Baeyens]

I am trying to create a control, using standard user components A.
The I use that component A as part of a new component B.
And finally I drop that component B on my form.

Now in Component A I filled in some default fields like this.

[Browsable(true)]
[DefaultValue("T itle"), Category("Appea rance")]
override public System.String Text {
set {
Title.Text=valu e;
Title.Invalidat e(true);}
get {return Title.Text;}
}

So on the Component B I changed the "Title" to something else (in this case
X-Axis) using the property editor, this works nice.

But when I run the program then the original Title is put there while then
it should be the "X-Axis"

Has anyone have experience with this?
Did I miss something? Some initialization order?
Currently I solve the problem by forcing it in the main form
programatically .

[Microsoft]

Hi Olaf,
if i understand what you trying , since the control B derrives from control
A, when you put the control B in a form it overrides the B.Text in the
InitializeCompo nents () function. try to set the Text property of the
control B in your form from the property Window to "", this will delete the
line B.Text = "B"; from the InitializeCompo nents () function and will have
the default value of the A control.
If that works tel me about it cos i haven try it.
"Olaf Baeyens" <ol**********@s kyscan.be> wrote in message
news:42******** *************@n ews.skynet.be.. .

I am trying to create a control, using standard user components A.
The I use that component A as part of a new component B.
And finally I drop that component B on my form.

Now in Component A I filled in some default fields like this.

[Browsable(true)]
[DefaultValue("T itle"), Category("Appea rance")]
override public System.String Text {
set {
Title.Text=valu e;
Title.Invalidat e(true);}
get {return Title.Text;}
}

So on the Component B I changed the "Title" to something else (in this
case
X-Axis) using the property editor, this works nice.

But when I run the program then the original Title is put there while then
it should be the "X-Axis"

Has anyone have experience with this?
Did I miss something? Some initialization order?
Currently I solve the problem by forcing it in the main form
programatically .

[Olaf Baeyens]

> if i understand what you trying , since the control B derrives from
control

A, when you put the control B in a form it overrides the B.Text in the
InitializeCompo nents () function. try to set the Text property of the
control B in your form from the property Window to "", this will delete the line B.Text = "B"; from the InitializeCompo nents () function and will have
the default value of the A control.
If that works tel me about it cos i haven try it.

I think that is what I tried to explain.
But on the web I found some examples how to fix this. Only the big trouble
is that it is very hard to understand what they try to explain, so when I
have a workable solution then I will post ik back.

[Olaf Baeyens]

I think I start to understand what is going on.
Maybe my explanation was not that good.

I have a user control A that contains a,b,c
I fill in a.Text="text" in the property editor.

Now I create a control B, that contains 2 A controls.
And I change the a.Text of control A on the B control using the property
editor to "Test 2"

I keep the control B visible on screen and recompile and wonder over wonder
the string "Test 2" gets replaced by to older "text".
So my executable incorrecly shows the older "text" string instead of the new
"Test 2".

But when I add this:

private void B_Load(object sender, System.EventArg s e) {
A.Text="Test 2";
}

The the label is correctly shown, but is a hack since it overrides the
property editor's choice programatically .

My guess is that B instantiates A, and any value given in B is overridden by
the fact that A gets instantiated later.
Is there a good trechnique for fixing this?

[Olaf Baeyens]

Odd I open the B control in design view.
I select the first A control, and in the property editor I change the "Text"
property to another string.
I see visually that the B control has the new updated text, and the property
editor also shows the text.
I save all files.

I close the B control dialog box.
Open it again and the original text is back, not the one I edited.

If I look inside the genarated B.cs code then I do not see the A.Text
property initialized in the "private void InitializeCompo nent()" part of
control B.cs.

It could because I created my own text property for A. (because A is
composed of 3 standard controls and one of it is a label, that shows that
A.Text string.

This is the definition of that A.Text property, is something missing?

private System.Windows. Forms.Label Title;

[Browsable(true)]
[DefaultValue("T itle"), Category("Appea rance")]
[Description("Th e title")]
override public System.String Text {
set {
Title.Text=valu e;
Title.Invalidat e(true);
}
get {return Title.Text;}
}