How to Pass Command-Line Arguments with Spaces to PowerShell Scripts from C#?

Integrating PowerShell scripts into C# applications provides powerful automation capabilities. However, handling command-line arguments containing spaces can be tricky. This article demonstrates a robust method for executing PowerShell scripts from C#, reliably passing arguments with embedded spaces.

The common approach of directly passing arguments often fails when spaces are present. The solution lies in using the PowerShell Command and CommandParameter objects to properly manage argument construction.

Here's a refined approach to execute a PowerShell script from C# with arguments, even those containing spaces:

1. Instantiate a PowerShell Runspace: Create a Runspace to manage the PowerShell execution environment.
2. Construct the Command: Create a Command object specifying the path to your PowerShell script.
3. Add Parameters: Use CommandParameter objects to add arguments. This correctly handles spaces and special characters. Each CommandParameter takes the argument name and its value.
4. Add to Pipeline: Add the Command object to a Pipeline.
5. Invoke the Pipeline: Execute the pipeline, initiating the PowerShell script execution.

Here's an improved code example reflecting these steps:

RunspaceConfiguration runspaceConfiguration = RunspaceConfiguration.Create();
Runspace runspace = RunspaceFactory.CreateRunspace(runspaceConfiguration);
runspace.Open();
Pipeline pipeline = runspace.CreatePipeline();

// Path to your PowerShell script
string scriptFile = "path/to/your/script.ps1";

// Create the Command object
Command myCommand = new Command(scriptFile);

// Add parameters with spaces handled correctly
myCommand.Parameters.Add(new CommandParameter("key1", "value with spaces"));
myCommand.Parameters.Add(new CommandParameter("key2", "another value"));

// Add the command to the pipeline
pipeline.Commands.Add(myCommand);

// Invoke the pipeline and handle the results
Collection<PSObject> results = pipeline.Invoke();

// Process the results as needed
foreach (PSObject result in results)
{
    // ... handle each result ...
}

runspace.Close();

This approach ensures that command-line arguments, regardless of whether they contain spaces, are correctly passed to your PowerShell script, enabling seamless integration between C# and PowerShell. Remember to replace "path/to/your/script.ps1" with the actual path to your script.

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