C# code for https://powershell.org/forums/topic/remotely-run-script-but-pass-in-the-script-to-a-executing-script-as-variable/

powershell-forum-remotely-run-script-but-pass-in-the-script-to-a-executing-script-as-variable-csharp-reply.cs

var script = System.IO.File.ReadAllText(textBoxScriptToRun.Text);

var match = Regex.Match(script, "function (?<FunctionName>[a-z]+-[a-z0-9]+)", 
    RegexOptions.IgnoreCase);
var functionName = match.Groups["FunctionName"];

Hashtable functionParams = new Hashtable();
foreach (var line in textBoxParameters.Lines)
{
    var tokens = line.Split("=".ToCharArray(), 2);
    if (tokens.Length == 2)
    {
        functionParams.Add(tokens[0], tokens[1]);
    }
}

var scriptBlock = ScriptBlock.Create(
    new StringBuilder()
        .AppendLine("param ([Parameter(Mandatory)][Hashtable]$FunctionParams)")
        .AppendLine(script)
        .AppendLine(String.Format("{0} @FunctionParams", functionName)).ToString()
);

using (PowerShell ps = PowerShell.Create())
{
    ps.AddCommand("Invoke-Command")
        .AddParameter("ComputerName", textBoxRemotePCName.Text)
        .AddParameter("ScriptBlock", scriptBlock)
        .AddParameter("ArgumentList", functionParams);

    var results = ps.Invoke();

    StringBuilder sb = new StringBuilder();
    if (ps.HadErrors)
    {
        foreach (var error in ps.Streams.Error.ReadAll())
        {
            sb.AppendLine(error.ToString());
        }
    }
    foreach (var result in results)
    {
        sb.AppendLine(result.ToString());
    }

    textBoxOutput.Text = sb.ToString();
}