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

Passing Spaced Command-Line Arguments to PowerShell Scripts from C#

This guide addresses the challenge of executing PowerShell scripts from C# applications, specifically handling command-line arguments containing spaces.

The Problem: Directly passing arguments with spaces often leads to errors when invoking PowerShell scripts from C#.

The Solution: The key is to correctly encapsulate arguments within the command execution process. This example demonstrates a robust method using the System.Management.Automation namespace:

1. Command Creation: Initiate a Command object, pointing to your PowerShell script's path.

   Command myCommand = new Command(scriptfile);

2. Parameter Definition: Define each command-line argument as a CommandParameter object. Crucially, ensure arguments with spaces are properly handled. This is typically done by enclosing them in double quotes.

   CommandParameter param1 = new CommandParameter("arg1", "value1");
   CommandParameter param2 = new CommandParameter("arg2", "\"value with spaces\""); // Note the double quotes

3. Parameter Addition: Add the CommandParameter objects to the Command object's Parameters collection.

   myCommand.Parameters.Add(param1);
   myCommand.Parameters.Add(param2);

4. Pipeline Execution: Integrate the Command into a PowerShell pipeline and execute it.

   RunspaceConfiguration runspaceConfiguration = RunspaceConfiguration.Create();
   Runspace runspace = RunspaceFactory.CreateRunspace(runspaceConfiguration);
   runspace.Open();
   Pipeline pipeline = runspace.CreatePipeline();
   pipeline.Commands.Add(myCommand);
   Collection<PSObject> results = pipeline.Invoke();
   runspace.Close();

Complete Example:

This complete code snippet demonstrates how to execute a PowerShell script with spaced arguments:

string scriptfile = @"C:\path\to\your\script.ps1"; // Replace with your script path
string arg1 = "value1";
string arg2 = "value with spaces";

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

Command myCommand = new Command(scriptfile);
myCommand.Parameters.Add(new CommandParameter("arg1", arg1));
myCommand.Parameters.Add(new CommandParameter("arg2", "\"" + arg2 + "\"")); //Escape spaces

Collection<PSObject> results = pipeline.Invoke();

runspace.Close();

// Process the results
foreach (PSObject result in results)
{
    Console.WriteLine(result.BaseObject);
}

Remember to replace "C:pathtoyourscript.ps1" with the actual path to your PowerShell script. This improved solution ensures reliable execution even when dealing with arguments containing spaces.

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