Inheriting a web control

[Eric]

I have webcontrol from which I would like to inherit so I can encapsulate it
within a table and let users configure it a design time.
My table renders and the property editor contains the control from which I
inherited but when I try to make modifications to the control such as adding
properties that it handles, I receive errors. The control I'm using is a
third party control which does inherit from WebControl.

What do I minimally need to do in my inherited class to make this work?

 

[Teemu Keiski]

Hi,

you should provide some code to demonstrate what you have done so far. There
shouldn't be anything too hard to get this to work, but that's all I can say
with this much information.

--
Teemu Keiski
MCP, Microsoft MVP (ASP.NET), AspInsiders member
ASP.NET Forum Moderator, AspAlliance Columnist

I have webcontrol from which I would like to inherit so I can encapsulate it
within a table and let users configure it a design time.
My table renders and the property editor contains the control from which I
inherited but when I try to make modifications to the control such as adding
properties that it handles, I receive errors. The control I'm using is a
third party control which does inherit from WebControl.

What do I minimally need to do in my inherited class to make this work?

 

[Eric]

public class EDMenu : DevExpress.Web.Menus.MainMenu, INamingContainer
{
public override ControlCollection Controls
{
get
{
EnsureChildControls();
return base.Controls;
}
}
protected override void CreateChildControls()
{
Controls.Clear();
base.CreateChildControls();
this.ID = "EDMenu1";
this.Height = Unit.Pixel(21);
this.BorderWidth = Unit.Empty;
this.ImageToLeft = "";
this.ImageToRight = "images/nav/spacer2.gif";
this.Width = Unit.Percentage(100);
this.BackColor = ColorTranslator.FromHtml("#EAEAEA");
this.Font.Size = FontUnit.Point(10);
string[] arFontNames = new string[4];
arFontNames[0] = "verdana";
arFontNames[1] = "arial";
arFontNames[2] = "helvetica";
arFontNames[3] = "sans-serif";
this.Font.Names = arFontNames;
this.ForeColor = ColorTranslator.FromHtml("#666666");
this.Font.Bold = true;
this.Root.ItemHeight = Unit.Pixel(18);
this.SelectedItemStyle.Font.Size = FontUnit.Point(10);
this.SelectedItemStyle.Font.Names = arFontNames;
this.SelectedItemStyle.Font.Bold = true;
this.SelectedItemStyle.BorderWidth = Unit.Pixel(1);
this.SelectedItemStyle.ForeColor = Color.Black;
this.SelectedItemStyle.BorderColor = Color.Black;
this.SelectedItemStyle.BackColor = Color.LightGray;
this.SeparatorStyle.Height = Unit.Pixel(18);
this.SeparatorStyle.ForeColor = Color.Black;
this.SeparatorStyle.BorderColor = Color.Transparent;
this.SeparatorStyle.Width = Unit.Pixel(4);
this.MenuItems.Add(new DevExpress.Web.Menus.MenuItem());
Controls.Add(this);
}
protected override void Render(HtmlTextWriter writer)
{
base.Render(writer);
writer.AddAttribute(HtmlTextWriterAttribute.Width, "100%");
writer.AddAttribute(HtmlTextWriterAttribute.Cellspacing, "0");
writer.AddAttribute(HtmlTextWriterAttribute.Cellpadding, "0");
writer.AddAttribute(HtmlTextWriterAttribute.Bgcolor, "#054ca6");
writer.AddAttribute(HtmlTextWriterAttribute.Border, "0");
writer.RenderBeginTag(HtmlTextWriterTag.Table);
RenderHeader(writer);
RenderMenu(writer);
RenderFooter(writer);
RenderShadow(writer);
writer.RenderEndTag();//table
}
protected void RenderMenu(HtmlTextWriter writer)
{
//<tr>
writer.RenderBeginTag(HtmlTextWriterTag.Tr);


//<td id="tdLeft" width="6" background="images/nav/left.gif"
height="18"><IMG src="images/nav/left.gif"></td>
writer.AddAttribute(HtmlTextWriterAttribute.Id, "tdLeft");
writer.AddAttribute(HtmlTextWriterAttribute.Width,"6");
writer.AddAttribute(HtmlTextWriterAttribute.Height,"18");

writer.AddAttribute(HtmlTextWriterAttribute.Background,"images/nav/left.gif"
);
writer.AddAttribute(HtmlTextWriterAttribute.Src,"images/nav/left.gif");
writer.RenderBeginTag(HtmlTextWriterTag.Td);
writer.RenderEndTag();//td

//<td id="tdMenu" bgColor="#eaeaea" height="18" runat="server">
writer.AddAttribute(HtmlTextWriterAttribute.Id, "tdMenu");
writer.AddAttribute(HtmlTextWriterAttribute.Height,"18");
writer.AddAttribute(HtmlTextWriterAttribute.Bgcolor,"#eaeaea");
writer.AddAttribute(HtmlTextWriterAttribute.Valign,"Top");
writer.RenderBeginTag(HtmlTextWriterTag.Td);
base.RenderContents(writer);
writer.RenderEndTag();//td

//<td id="tdRight" width="6" background="images/nav/right.gif"
height="18"><IMG src="images/nav/right.gif"></td>
writer.AddAttribute(HtmlTextWriterAttribute.Id, "tdRight");
writer.AddAttribute(HtmlTextWriterAttribute.Width,"6");

writer.AddAttribute(HtmlTextWriterAttribute.Background,"images/nav/right.gif
");
writer.AddAttribute(HtmlTextWriterAttribute.Src,"images/nav/right.gif");
writer.RenderBeginTag(HtmlTextWriterTag.Td);
writer.RenderEndTag();//td

writer.RenderEndTag();//tr

}

}