How to see the changed value in design mode of composite control

[Guest]

When I change a property, I can`t see it in design mode.

i defined the property as followed:

[Bindable(true)]
[Category("Box")]
[DefaultValue("Sophia")]
[Description("The Item description displayed in the control")]
public string DBItem_Description
{
get
{
EnsureChildControls();
return ItemDesc.Text;
}
set
{
EnsureChildControls();
ItemDesc.Text = value;
}
}

but it seems to ignore the default value and allso, if i change the value in
the design mode properties page it still ignores the change.

Any ideas?

thanks,
Elad.

 

[Walter Wang [MSFT]]

Hi,

If your control is inheriting from CompositeControl and doesn't change the
its child control tree based on property change, then you can override
RecreateChildControls() to workaround this issue:

protected override void RecreateChildControls()
{
EnsureChildControls();
}

The root cause of this issue is that the default implementation of
RecreateChildControls will clear the controls collection first which loses
the property value stored in the child control's ViewState.

There's a detailed discussion here: http://forums.asp.net/thread/792555.aspx

For the DefaultValueAttribute applied to this property, since this
attribute is used when the property is returned, and in your case, when the
property is not set, the control ItemDesc's Text property is never get a
change to set. That's why it's not working. I suggest you to set the
default property when you create the control. For example, if the control
is a TextBox:

protected override void CreateChildControls()
{
Controls.Clear();

ItemDesc = new TextBox();
ItemDesc.ID = "text1";
ItemDesc.Text = "Sophia";
Controls.Add(ItemDesc);
}



Sincerely,
Walter Wang ([email protected], remove 'online.')
Microsoft Online Community Support

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[Guest]

Just what I was looking for.
Thanks Walter.