Basic Custom Control Question

[C# Learner]

I've derived from System.Windows.Forms.TextBox. I have added a property,
whose value I'd like to set when the component is created at design-time.
How can I do so?

The following doesn't work.

class DerivedTextBox : TextBox
{
public DerivedTextBox() {
if (DesignTime) {
MyProperty = foo;
}
}
...
}

[Bob Powell [MVP]]

The DesignMode property isn't valid in the constructor. You can detect it's
state just about anywhere else though.

--
Bob Powell [MVP]
Visual C#, System.Drawing

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"C# Learner" <csh...@learner.here> wrote in message
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[C# Learner]

"Bob Powell [MVP]" <bob@_spamkiller_bobpowell.net> wrote:

> The DesignMode property isn't valid in the constructor. You can detect it's
> state just about anywhere else though.

In that case, how can I achieve what I'm trying?

I just want to set a value when the control is created at design-time. I
don't want to reset this value when it's created at run-time because that
would override any value the user has set at design-time.

[Claes Bergefall]

Specify a new designer:

[Designer(typeof(DerivedTextBox.DerivedTextBoxDesigner))]
public class DerivedTextBox : System.Windows.Forms.TextBox
{
public DerivedTextBox ()
{
}

public class DerivedTextBoxDesigner :
System.Windows.Forms.Design.ControlDesigner
{
public override void OnSetComponentDefaults()
{
base.OnSetComponentDefaults();
((DerivedTextBox) this.Control).MyProperty = foo;
}
}
}

"C# Learner" <csh...@learner.here> wrote in message
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