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I wanted to get the blog URL of each posting, so that I can implement social media sharing buttons on each and every post.
After some research, here's the solution.
<%# HttpContext.Current.Request.Url.Scheme%>://<%# HttpContext.Current.Request.Url.Host%> <CSBlog:WeblogPostData runat='server' Property='ViewPostURL' />
As Community Server does not provide the full absolute URL of each blog post, the answer is to retrieve the solution in 3 parts.
This article discusses the new Delphi 8 property access specifiers.