PSRunspacedDelegate

0.1

RunspacedDelegateFactory.cs

                                using System;

using System.Collections.Generic;

using System.Linq;

using System.Linq.Expressions;

using System.Management.Automation.Runspaces;

namespace PowerShell

{

    public class RunspacedDelegateFactory

    {

        public static Delegate NewRunspacedDelegate(Delegate _delegate, Runspace runspace)

        {

            Action setRunspace = () => Runspace.DefaultRunspace = runspace;

            return ConcatActionToDelegate(setRunspace, _delegate);

        }

        private static Expression ExpressionInvoke(Delegate _delegate, params Expression[] arguments)

        {

            var invokeMethod = _delegate.GetType().GetMethod("Invoke");

            return Expression.Call(Expression.Constant(_delegate), invokeMethod, arguments);

        }

        public static Delegate ConcatActionToDelegate(Action a, Delegate d)

        {

            var parameters =

                d.GetType().GetMethod("Invoke").GetParameters()

                .Select(p => Expression.Parameter(p.ParameterType, p.Name))

                .ToArray();

            Expression body = Expression.Block(ExpressionInvoke(a), ExpressionInvoke(d, parameters));

            var lambda = Expression.Lambda(d.GetType(), body, parameters);

            var compiled = lambda.Compile();

            return compiled;

        }

    }

}