Here's how to create status dependent content in Community Server 2008.The following code allows one to show content depending on whether the user is logged into the site or not.
In the following example, if the user is anonymous, the user is shown TRUE. If the user is logged in, the user is shown FALSE.
<CSControl:ConditionalContent runat="server"> <ContentConditions> <CSControl:UserPropertyValueComparison runat="server" UseAccessingUser="true" ComparisonProperty="IsAnonymous" Operator="IsSetOrTrue" /> </ContentConditions> <TrueContentTemplate> TRUE </TrueContentTemplate> <FalseContentTemplate> FALSE </FalseContentTemplate> </CSControl:ConditionalContent>
In 2017, with the release of Delphi 10.2 Tokyo, Embarcadero introduced a specialized implementation of the Observer pattern into the System.Classes unit. While it has been in the wild for 9 years, it remains a "hidden" architecture for many, primarily because it serves as the invisible engine behind LiveBindings. Other than live bindings, you can also use the Observer pattern as a way to update component settings to the Windows registry, an .ini file, or persist it elsewhere.
System.Classes