存储具有给定属性的对象实例方法，以便稍后调用

Question

正如标题所说，使用反射我得到了具有给定属性的类型的方法。然后我想存储该对象实例的该方法，以便以后可以调用它。我不确定如何将该方法与该实例一起存储在包含 Action 的字典中。消息是字典中的关键用途。所有具有此属性的方法都需要采用 1 个动态类型的参数。

static Dictionary<string, Action<dynamic>> networkHooks = new Dictionary<string, Action<dynamic>>();

private static void RegisterNetworkMethods(Type type, INetworkEnabled obj)
{
    // get the methods of this type that have the NetworkMethodAttribute
    var methods = (from m in type.GetMethods(BindingFlags.NonPublic | BindingFlags.Instance)
                       where m.GetCustomAttributes(false).OfType<NetworkMethodAttribute>().Count() > 0
                       select m).ToList();

    foreach(var method in methods)
    {
        // get the NetworkMethodAttribute Message variable that was assigned
        var message = method.GetCustomAttribute<NetworkMethodAttribute>().Message;

        // todo: store this instance method in an Action somehow so it can be called later
        // networkHooks.Add(message, ???);
    }
}

Answer 1

如果您使用Action<dynamic>，因为这些方法可以采用任何类型的参数，您可以使用此版本使其工作。然后，您可以在 Dictionary 中存储的委托上调用 DynamicInvoke(param) 来调用方法

static Dictionary<string, Delegate> networkHooks = new Dictionary<string, Delegate>();

private static void RegisterNetworkMethods(Type type, object target)
{
    // get the methods of this type that have the NetworkMethodAttribute
    var methods = (from m in type.GetMethods(NonPublic | Instance)
                   where m.GetCustomAttributes(false).OfType<NetworkMethodAttribute>().Count() > 0
                   select m).ToList();

    foreach (var method in methods)
    {
        // get the NetworkMethodAttribute Message variable that was assigned
        var message = method.GetCustomAttribute<NetworkMethodAttribute>().Message;

        // todo: store this instance method in an Action somehow so it can be called later
        networkHooks.Add(message, Delegate.CreateDelegate(typeof(Action<Anything>).GetGenericTypeDefinition().MakeGenericType(method.GetParameters()[0].ParameterType), target, method.Name));
    }
}

旁注：.OfType<NetworkMethodAttribute>().Count() > 0 可以改成.OfType<NetworkMethodAttribute>().Any()，这样更快

Answer 2

这样的事情应该会让你朝着正确的方向前进。

    private static void RegisterNetworkMethods(Type type, INetworkEnabled obj)
    {
        // get the methods of this type that have the NetworkMethodAttribute
        var methods = (from m in type.GetMethods(BindingFlags.NonPublic | BindingFlags.Instance)
                       where m.GetCustomAttributes(false).OfType<NetworkMethodAttribute>().Count() > 0
                       select m).ToList();

        foreach(var method in methods)
        {
            // get the NetworkMethodAttribute Message variable that was assigned
            var message = method.GetCustomAttribute<NetworkMethodAttribute>().Message;

            var action = (Action<dynamic>) Delegate.CreateDelegate(typeof(Action<dynamic>), method);

            networkHooks.Add(message, action);
        }
    }