Some useful Func<T> extensions methods

FuncExtensions.cs

using System;

namespace NoNamespace
{
    public static class FuncExtensions
    {
        public static Func<T> ToFunc<T>(this Lazy<T> lazyValue)
        {
            if (lazyValue == null)
                throw new ArgumentNullException("lazyValue");

            return (Func<T>)Delegate.CreateDelegate(typeof(Func<T>), lazyValue, typeof(Lazy<T>).GetProperty("Value").GetGetMethod());
        }

        public static Func<T> RunOnce<T>(this Func<T> valueFactory)
        { 
            if (valueFactory == null)
                throw new ArgumentNullException("valueFactory");

            return new Lazy<T>(valueFactory, true).ToFunc();
        }
    }
}