ControlDesigner.UpdateDesignTimeHtml Method

public:
 virtual void UpdateDesignTimeHtml();

public virtual void UpdateDesignTimeHtml ();

abstract member UpdateDesignTimeHtml : unit -> unit
override this.UpdateDesignTimeHtml : unit -> unit

Public Overridable Sub UpdateDesignTimeHtml ()

Examples

The following code example demonstrates how to respond to a Click event in a control designer to change the focus between regions in a multi-region control and use the UpdateDesignTimeHtml method to update the appearance of the control in the design host.

This code example is part of a larger example for the EditableDesignerRegion class.

// Handler for the Click event, which provides the region in the arguments.
protected override void OnClick(DesignerRegionMouseEventArgs e)
{
    if (e.Region == null)
        return;

    // If the clicked region is not a header, return
    if (e.Region.Name.IndexOf("Header") != 0)
        return;

    // Switch the current view if required
    if (e.Region.Name.Substring(6, 1) != myControl.CurrentView.ToString())
    {
        myControl.CurrentView = int.Parse(e.Region.Name.Substring(6, 1));
        base.UpdateDesignTimeHtml();
    }
}

' Handler for the Click event, which provides the region in the arguments.
Protected Overrides Sub OnClick(ByVal e As DesignerRegionMouseEventArgs)
    If IsNothing(e.Region) Then
        Return
    End If

    ' If the clicked region is not a header, return
    If e.Region.Name.IndexOf("Header") <> 0 Then
        Return
    End If

    ' Switch the current view if required
    If e.Region.Name.Substring(6, 1) <> myControl.CurrentView.ToString() Then
        myControl.CurrentView = Integer.Parse(e.Region.Name.Substring(6, 1))
        MyBase.UpdateDesignTimeHtml()
    End If
End Sub

Remarks

The UpdateDesignTimeHtml method is called by the design host to update the display of the associated Web server control at design time, such as when the control has been modified. Also, a control designer can call the UpdateDesignTimeHtml method after modifying values of the control to update the display of the control.

Applies to

See also

• ComponentChanged
• ASP.NET Control Designers Overview