Why a child control can not change the visibility of its parent control? RSS

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  ericyzhou

  Member

  2 Points

  23 Posts

  Why a child control can not change the visibility of its parent control?

  May 02, 2012 08:23 AM|LINK

  Create a customized template control:

  public class TestViewStateControl: WebControl
  	{
  		[PersistenceMode(PersistenceMode.InnerProperty)]
  		public ITemplate ContentTemplate { get; set;}
  
  		protected override void CreateChildControls()
  		{
  			if ( ContentTemplate != null)
  			{
  				WebControl container = new WebControl(HtmlTextWriterTag.Div);
  				ContentTemplate.InstantiateIn(container);
  				Controls.Add(container);
  			}
  			base.CreateChildControls();
  		}
  	}

  Then add this control to page:

  	<custom:TestViewStateControl ID="testViewState" runat="server" EnableViewState="true" 
  		BackColor="Aquamarine" Height="100px" Width="200px">
  		<ContentTemplate>
  			<asp:Button ID="btnHideParent" runat="server" Text="Hide" OnClick="btnHideParent_Click" />
  		</ContentTemplate>
  	</custom:TestViewStateControl>

  The "bthHideParent_Click" method, set parent's Visibility property to false like this:

  	protected void btnHideParent_Click(object sender, EventArgs e)
  	{
  		testViewState.Visible = false;
  	}

  If you run this page, click the button will not causing the "testViewState" control to become invisible. Even if I turn off view state it is still not working as I expected
  
  
  
  

  viewstate

• • Reply
  

  ericyzhou

  Member

  2 Points

  23 Posts

  Re: Why a child control can not change the visibility of its parent control?

  May 03, 2012 06:17 AM|LINK

  Did some more test, the child control seems can only making its parent control invisible when its parent's viewstate is turned off. Any comment guys?