The P# compiler can be used to parse a P# program, rewrite it to C# and finally compile it to an executable. To invoke the compiler use the following command:
.\PSharpCompiler.exe /s:${SOLUTION_PATH}\${SOLUTION_NAME}.sln
Where ${SOLUTION_PATH} is the path to your P# solution and ${SOLUTION_NAME} is the name of your P# solution.
To specify an output path destination use the option /o:${OUTPUT\_PATH}.
To compile only a specific project in the solution use the option /p:${PROJECT_NAME}.
To compile as a library (dll) use the option /t:lib.
To compile for testing use the option /t:test.
To see the available command line options use the option /?.
Alternatively, one can follow the instructions here to build directly from Visual Studio.