自定义UserControl-设计时支持控件重画

Question

I have created my custom UserControl with some custom properties for it. For example:

[Description("Example Description"),Category("CustomSettings"),DefaultValue("Transmedicom")]
public string DatabaseAddress
{
    get; set;
}

Everything works fine. I can change custom property in code and in design-time .

What I'm looking for (and cannot find anything) now is: How could I repaint (reacreate) my UserControl in design-time when my custom property change in design-time.

Let's say when DatabaseName will be changed to localhost UserControl will add and display some Label on my UserControl. It's important to work in Design-Time .

Answer 1

Nothing special there. You just have to set the text to Label inside the property setter. That should update the UI.

private string databaseAddress;
[Description("Example Description"), Category("CustomSettings"), DefaultValue("Transmedicom")]
public string DatabaseAddress
{
    get { return databaseAddress; }
    set 
    { 
        databaseAddress = value;
        yourLabel.Text = value;//Set value to Label or whatever
    }
}

Answer 2

Try this

private string _databaseAddress = "localHost";
[Description("Example Description"), Category("CustomSettings"), DefaultValue("Transmedicom")]
public string DatabaseAddress
{
    get
    {
        return _databaseAddress;
    } 
    set 
    {
        if(!string.IsNullOrEmpty(value))
        {
            _databaseAddress = value;
            lblAddress.Text = value;
            lblAddress.Invalidate();
        }
    }
}

Answer 3

Both previous answers are correct.
I just want to add that the user control can even react on resizing during design time, using the Layout event.