将自定义对象从C＃传递给Powershell

Question

I have a C# class that should execute a Powershell script by passing it a Log object. Log is entirely written in C#, and should be shared across the C# code and Powershell to achieve common logging.

Can someone please tell me how I can pass the custom object from C# to Powershell and use it there?

Answer 1

I believe it using runspace will solve your problem. A good explanation and examples on them you can find in the following this link : http://www.codeproject.com/Articles/18229/How-to-run-PowerShell-scripts-from-C .

Just a generic idea of how to use them.

if you have script :

param($logger2)
$logger2.Write("logger2 Write was called");
$logger.Write("logger Write was called");

and you want to subsitute logger2 and logger use following code :

String scriptContent = // get script content
Logger logger = new Logger();
Logger2 logger2 = new Logger2();
// create ps runspace
using (Runspace runspace = RunspaceFactory.CreateRunspace())
{
    // start session
    runspace.Open();
    // set variables
    runspace.SessionStateProxy.SetVariable("logger", logger);
    // supply commands
    using (Pipeline pipeline = runspace.CreatePipeline())
    {
        // create ps representation of the script
        Command script = new Command(scriptContent, true, false);
        // suppy parameters to the script
        script.Parameters.Add(new CommandParameter("logger2", logger2));
        // send script to pipeline
        pipeline.Commands.Add(script);
        // execute it
        Collection<PSObject> results = pipeline.Invoke();
        // close runspace
        runspace.Close();
    }
}

Answer 2

You can share a class between PowerShell and C# by compiling your Log class into an assembly and use LoadFile in PowerShell (should work in V1 and V2)

$lib = [System.Reflection.Assembly]::LoadFile('path to your dll');
$lib.Log("Terrible things have happened!")

If however, you want to share an instance of a class between PowerShell and C# you could use SessionStateProxy.SetVariable .

Answer 3

If you just need to use the class in a powershell script, you can put the actual C# code into the script itself and use that as the definition for a type.

There is a tutorial here.

Basically you use Add-Type -TypeDefinition <C# code> -Language CSharp

Answer 4

Add the reference to system.management.automation.dll to your project and use the PowerShell Class . See the example there, it is almost ready, change the line

ps.AddCommand("Get-Process");

to something like:

ps.AddCommand(<script-path/name-of-script-in-path>).AddParameter("Log", logInstance);

It tells to invoke your script with the parameter Log which value is an instance logInstance to be passed in the script. The script should have the parameter Log and use it as $Log in its code:

param($Log)

$Log.Write("Begin ...")
...
$Log.Write("End ...")