Get the current runspace of a powershell instance (Follow up to a previous question - Link in question)

Question

So this is a follow up question to a question I posted last week
If
PS {some Path}>C: = PS C:\> then why not HKLM: = PS HKLM:\>
So here is where I am with the question above
After running pretty much all of the powershell related DLL files through redgate's .NET Reflector I fiinally discovered where those "C:" = "Set-Location C:" were being created.
namespace System.Management.Automation.Runspaces
public class InitialSessionState
// More here but cut them out to save space in this post
internal static SessionStateFunctionEntry[] BuiltInFunctions = new SessionStateFunctionEntry[]
new SessionStateFunctionEntry("prompt", DefaultPromptString),
// More here but cut them out to save space in this post
new SessionStateFunctionEntry("A:", "Set-Location A:"),
new SessionStateFunctionEntry("B:", "Set-Location B:"),
new SessionStateFunctionEntry("C:", "Set-Location C:"),
new SessionStateFunctionEntry("D:", "Set-Location D:"),
new SessionStateFunctionEntry("E:", "Set-Location E:"),
new SessionStateFunctionEntry("F:", "Set-Location F:"),
new SessionStateFunctionEntry("G:", "Set-Location G:"),
new SessionStateFunctionEntry("H:", "Set-Location H:"),
new SessionStateFunctionEntry("I:", "Set-Location I:"),
new SessionStateFunctionEntry("J:", "Set-Location J:"),
new SessionStateFunctionEntry("K:", "Set-Location K:"),
new SessionStateFunctionEntry("L:", "Set-Location L:"),
new SessionStateFunctionEntry("M:", "Set-Location M:"),
new SessionStateFunctionEntry("N:", "Set-Location N:"),
new SessionStateFunctionEntry("O:", "Set-Location O:"),
new SessionStateFunctionEntry("P:", "Set-Location P:"),
new SessionStateFunctionEntry("Q:", "Set-Location Q:"),
new SessionStateFunctionEntry("R:", "Set-Location R:"),
new SessionStateFunctionEntry("S:", "Set-Location S:"),
new SessionStateFunctionEntry("T:", "Set-Location T:"),
new SessionStateFunctionEntry("U:", "Set-Location U:"),
new SessionStateFunctionEntry("V:", "Set-Location V:"),
new SessionStateFunctionEntry("W:", "Set-Location W:"),
new SessionStateFunctionEntry("X:", "Set-Location X:"),
new SessionStateFunctionEntry("Y:", "Set-Location Y:"),
new SessionStateFunctionEntry("Z:", "Set-Location Z:"),
new SessionStateFunctionEntry("cd..", "Set-Location .."),
new SessionStateFunctionEntry(@"cd\", @"Set-Location \"),
Then further down in the class it is called 
public static InitialSessionState CreateDefault()
InitialSessionState state = new InitialSessionState();
state.Variables.Add(BuiltInVariables);
state.Commands.Add(new SessionStateApplicationEntry("*"));
state.Commands.Add(new SessionStateScriptEntry("*"));
state.Commands.Add(BuiltInFunctions);
state.Commands.Add(BuiltInAliases);
foreach (PSSnapInInfo info in PSSnapInReader.ReadEnginePSSnapIns())
try
PSSnapInException exception;
state.ImportPSSnapIn(info, out exception);
catch (PSSnapInException exception2)
throw exception2;
state.LanguageMode = PSLanguageMode.FullLanguage;
state.AuthorizationManager = new PSAuthorizationManager(Utils.DefaultPowerShellShellID);
return state.Clone();
So the InitialSessionState class fills in these values.
My problem now is I cannot seem to find out how to get an attachment to the CURRENT either
InitialSessionState
Runspace
I can find plenty of forum posts and blogs about how to run powershell in c# but they ALL involve instantiating a NEW powershell runtime.
I can and have written
InitialSessionState iss = InitialSessionState.CreateDefault();
and I can step through the debugger and watch it fill in the functions but as soon as it finally gets to the powershell prompt all the functions are gone.
On another attempt I tried to create a runspace from the current host
thisRunspace = RunspaceFactory.CreateRunspace(this.Host);
where this is public class ConfluenceProvider : NavigationCmdletProvider
And the line of code above is called in 
        protected override System.Collections.ObjectModel.Collection<PSDriveInfo> InitializeDefaultDrives()
When I run the code and debug  the runspace created has a different InstanceId than what ultimately shows up in the powershell console if I do $Host.Runspace.InstanceId
This provider will ultimately be a part of a module with other cmdlets and functions but I would like to know how to attach to the actual runspace, sessionstate, WHATEVER will do the trick that the module is loaded into so I can add functions to it.
So if anyone has any clue or knows of other blogs, walkthroughs i could read through that covers this it would be a huge help.
Thanks again everyone
Quidquid latine dictum sit, altum videtur

Answer 1

Hi Tofubug,
Since I'm not familiar about C#, however, if want to run powershell script in C#, the script below may be helpful for you:
RunspaceConfiguration runspaceConfiguration = RunspaceConfiguration.Create();
Runspace runspace = RunspaceFactory.CreateRunspace(runspaceConfiguration);
runspace.Open();
RunspaceInvoke scriptInvoker = new RunspaceInvoke(runspace);
Pipeline pipeline = runspace.CreatePipeline();
//Here's how you add a new script with arguments
Command myCommand = new Command(scriptfile);
CommandParameter testParam = new CommandParameter("key","value");
myCommand.Parameters.Add(testParam);
pipeline.Commands.Add(myCommand);
// Execute PowerShell script
results = pipeline.Invoke();
And these threads for your reference:
Execute PowerShell Script from C# with Commandline Arguments
How to run PowerShell scripts from C#
How do you set FullLanguage mode
for remote PowerShell from C#?
If I have any misunderstanding, please feel free to let me know.
Best Regards,
Anna Wang