Refreshes the design-time HTML markup for the associated Web server control by calling the GetDesignTimeHtml method.
Assembly: System.Design (in System.Design.dll)
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.
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If you are calling the ComponentChanged event, or using the PropertyDescriptor object to set properties, the IComponentChangeService interface calls the UpdateDesignTimeHtml method for you. |
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 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// 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();
}
}- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
