InvokeStrategy.cs

using System;
using System.Reflection;
using System.Threading.Tasks;

namespace Fnproject.Fn.Fdk
{
    sealed internal class InvokeStrategyFactory
    {
        private InvokeStrategyFactory() { }

        internal static IInvokeStrategy Create(MethodInfo method, Type classType)
        {
            if (method.IsStatic)
            {
                if (typeof(Task).IsAssignableFrom(method.ReturnType))
                {
                    return new InvokeStaticAsync(method);
                }
                else
                {
                    return new InvokeStatic(method);
                }
            }
            else
            {
                if (typeof(Task).IsAssignableFrom(method.ReturnType))
                {
                    return new InvokeNonStaticAsync(method, classType);
                }
                else
                {
                    return new InvokeNonStatic(method, classType);
                }
            }
        }
    }

    internal interface IInvokeStrategy
    {
        object Invoke(object[] args);
    }

    internal class InvokeStatic : IInvokeStrategy
    {
        private readonly MethodInfo method;

        public object Invoke(object[] args)
        {
            return method.Invoke(null, args);
        }

        public InvokeStatic(MethodInfo method)
        {
            this.method = method;
        }
    }

    internal class InvokeNonStaticAsync : IInvokeStrategy
    {
        private readonly MethodInfo method;
        private readonly object instance;

        public object Invoke(object[] args)
        {
            // Add try catch
            Task task = (Task)method.Invoke(instance, args);
            task.GetAwaiter().GetResult();
            var resultProperty = task.GetType().GetProperty("Result");
            return resultProperty.GetValue(task);
        }

        public InvokeNonStaticAsync(MethodInfo method, Type classType)
        {
            this.method = method;
            instance = Activator.CreateInstance(classType);
        }
    }

    internal class InvokeNonStatic : IInvokeStrategy
    {
        private readonly MethodInfo method;
        private readonly object instance;

        public object Invoke(object[] args)
        {
            return method.Invoke(instance, args);
        }

        public InvokeNonStatic(MethodInfo method, Type classType)
        {
            this.method = method;
            instance = Activator.CreateInstance(classType);
        }
    }

    internal class InvokeStaticAsync : IInvokeStrategy
    {
        private readonly MethodInfo method;
        public object Invoke(object[] args)
        {
            // Add try catch
            Task task = (Task)method.Invoke(null, args);
            task.GetAwaiter().GetResult();
            var resultProperty = task.GetType().GetProperty("Result");
            return resultProperty.GetValue(task);
        }

        public InvokeStaticAsync(MethodInfo method)
        {
            this.method = method;
        }
    }
}