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As you ve seen, when properties conflict between your controls and your theme, the theme wins. However, in some cases you might want to change this behavior so that your controls can fine-tune a theme by specifically overriding certain details. ASP .NET gives you this option, but it s an all-ornothing setting that applies to all the controls on the entire page. To make this change, just use the StyleSheetTheme attribute instead of the Theme attribute in the Page directive. (The StyleSheetTheme setting works more like CSS.) Here s an example: <%@ Page Language="C#" AutoEventWireup="true" ... StyleSheetTheme="FunkyTheme" %> Now the custom yellow background of the ListBox takes precedence over the background color specified by the theme. Figure 15-5 shows the result and a potential problem. Because the foreground color has been changed to white, the lettering is now difficult to read. Overlapping formatting specifications can cause glitches such as this, which is why it s often better to let your themes take complete control by using the Theme attribute.

Master pages can t be requested directly. To use a master page, you need to build a linked content page.

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In the LinkTable example, it makes sense to transmit basic information about what link was clicked. To support this design, you can create the following EventArgs object, which adds a readonly property that has the corresponding LinkTableItem object: public class LinkTableEventArgs : EventArgs { private LinkTableItem selectedItem; public LinkTableItem SelectedItem { get { return selectedItem; } } private bool cancel = false; public bool Cancel { get { return cancel; } set { cancel = value; } } public LinkTableEventArgs(LinkTableItem item) { selectedItem = item; } } Notice that the LinkTableEventArgs defines two new details a SelectedItem property that allows the user to get information about the item that was clicked and a Cancel property that the user can set to prevent the LinkTable from navigating to the new page. One reason you might set Cancel is if you want to respond to the event in your web-page code and handle the redirect yourself. For example, you might want to show the target link in a server-side <iframe> or use it to set the content for an <img> tag rather than navigating to a new page. Next, you need to create a new delegate that represents the LinkClicked event signature. Here s what it should look like: public delegate void LinkClickedEventHandler(object sender, LinkTableEventArgs e); Using the LinkClickedEventHandler, the LinkTable class defines a single event: public event LinkClickedEventHandler LinkClicked; To intercept the server click, you need to replace the HyperLink control with a LinkButton, because only the LinkButton raises a server-side event. (The HyperLink simply renders as an anchor that directs the user straight to the target when clicked.) Here s the new template you need: <ItemTemplate> <img height="23" src="exclaim.gif" width="25" align="absMiddle" border="0"> <asp:LinkButton id="HyperLink1" Font-Names="Verdana" Font-Size="XX-Small" ForeColor="#0000cd" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "Text") %>' CommandArgument='<%# DataBinder.Eval(Container.DataItem, "Url") %>'> </asp:LinkButton> </ItemTemplate>

It s possible to use both the Theme attribute and the StyleSheetTheme attribute at the same time so that some settings are always applied (those in the Theme) and others are applied only if they aren t already specified in the control (those in the StyleSheetTheme). Depending on your point of view (and level of comfort with themes and styles), this is either a terribly confusing design or a useful way to make a distinction between settings you want to enforce (Theme) and settings you want to use as defaults (StyleSheetTheme).

You can then intercept the server-side click event and forward it along to the web page as a LinkClicked event Here s the code you need: protected void listContent_ItemCommand(object source, SystemWebUIWebControlsDataListCommandEventArgs e) { if (LinkClicked != null) { // Get the HyperLink object that was clicked LinkButton link = (LinkButton)eItemControls[1]; // Construct the event arguments LinkTableItem item = new LinkTableItem(linkText, linkCommandArgument); LinkTableEventArgs args = new LinkTableEventArgs(item); // Fire the event LinkClicked(this, args); // Navigate to the link if the event recipient didn't // cancel the operation if (!argsCancel) { ResponseRedirect(itemUrl); } } } Note that when you raise an event, you must first check to see if the event variable contains a null reference If it does, it signifies that no event handlers are registered yet (perhaps the control hasn t been created).

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