I am using the Sandcastle Help File Builder to output my C# XML-DOC file to the Website format. How can I accomplish the samething from the command line so that I can add this as a build event in Visual Studio when building the actual project?
The end goal is to have the website Help File content built when I build the Visual Studio project.
As Scott Wylie indicated, you need to specify this in the post build event command line in Visual Studio's project properties. However, I would suggest using Sandcastle Help File Builder (SHFB) rather than Sandcastle directly. It makes the command line call short and simple as shown below, but note that first you have to configure the SHFB project with the SHFB GUI, which creates an msbuild-compatible build file with the ".shfbproj" suffix:
C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe /p:Configuration=Release myProject.shfbproj
However, note that I take the opposite approach from what you are doing: instead of using Visual Studio to interactively launch a build and ancillary actions, I use ant (nant) to launch a build of everything, which includes my Visual Studio solutions and subsequent SHFB action. So this is really the command-line call I make to build the documentation with Sandcastle:
<exec executable="${msbuild}" dir="${csharpdoc}" output="${csharpdoc.log}">
<arg value="/p:Configuration=Release"/>
<arg value="myProject.shfbproj"/>
</exec>
My preference is that the entire build should be launchable from the command line so there are no interactions required (e.g. launching Visual Studio, etc.). That provides the flexibility to run either as a scheduled recurring task or on-demand from the shell.