ExpressionTrees_CreateRunTime

static void Main(string[] args)
        {
            var cat = new Cat();

            Expression<Func<Cat, string>> expr = c => c.CatMethod(42, "MyTested ASP.NET");

            var myClass = typeof(Cat);

            var numberConstant = Expression.Constant(42);
            var textConstant = Expression.Constant("MyTested ASP.NET");

            var parameterExpression = Expression.Parameter(myClass, "c");

            var methodInfo = myClass.GetMethod(nameof(Cat.CatMethod));

            var methodCallExpression = Expression.Call(parameterExpression, methodInfo, numberConstant, textConstant);

            var lambdaExpression = Expression.Lambda<Func<Cat, string>>(methodCallExpression, parameterExpression);

            var function = lambdaExpression.Compile();

            Console.WriteLine(function(cat));
        }