我有一个计划我在哪里使用反射载荷的类动态的基础案文的文件。
当我运行我的代码我可以得到所有类、方法和事件的印刷来画面,甚至可以援用的方法。
我加入的所有事件的一个典和我想一一列举,通过它们,然后创建一个事件处理程序获得的数据发送的事件。
这里是我的方法获得活动一词典:
private Dictionary<string, EventInfo> RetrieveEvents(string label, string type)
{
try
{
this.displaysAssembly = Assembly.LoadFrom(Path.Combine(Directory.GetApplicationDirectory(), "Framework.DisplayDrivers.dll"));
string assembly = string.Format("Framework.DisplayDrivers.{0}", type);
Type cswitcher = displaysAssembly.GetType(assembly);
fullClass = cswitcher;
Dictionary<string, EventInfo> ekvp = new Dictionary<string, EventInfo>();
List<EventInfo> eventInfos = cswitcher.GetEvents().Where(e => HasInformationAttribute(e)).ToList();
foreach (var e in eventInfos)
{
if (!ekvp.ContainsKey(label))
{
ekvp.Add(e.Name, e);
}
}
return (ekvp);
}
catch (MissingMethodException e)
{
ErrorLog.Error(LogHeader + "Unable to create Display. No constructor: {0}", e.Message);
}
catch (ArgumentException e)
{
ErrorLog.Error(LogHeader + "Unable to create Display. No type: {0}", e.Message);
}
catch (NullReferenceException e)
{
ErrorLog.Error(LogHeader + "Unable to create Display. No match: {0}", e.Message);
}
return null;
}
如果我打印出来的字典中我可以看到的事件的关键的和价值。
但我似乎无法创建一个事件处理程序。 我已经尝试了许多选项,包括:
foreach(var evnt in d._projectors._events)
{
EventInfo ev = evnt.Value;
try
{
// this id not work
object classInstance = Activator.CreateInstance(d._projectors.fullClass);
ev.AddEventHandler(classInstance, new EventHandler(DisplayChangeEvents.DisplayMuteChangedEvent));
// this did not work either
if (d._projectors._events.TryGetValue("OnPowerStateRecieved", out ev))
{
ev.AddEventHandler(ev.Name, new EventHandler(DisplayChangeEvents.DisplayPowerChangedEvent));
}
}
catch (Exception ex)
{
ErrorLog.Error("Error creating event handers : " + ex.Message + "\r");
}
}
我想所有本事件和处理数据,在另一类评为"DisplayChangeEvents".
我已经试图2天,获得这及其最后一块我需要得到程序工作的预期。
在此先感谢
根据一个建议,我的代码中foreach循环:
foreach(var evnt in d._projectors._events)
{
EventInfo ev = evnt.Value;
try
{
if (evnt.Key == "OnPowerStateRecieved")
{
ev.AddEventHandler(d._projectors.fullClass, new EventHandler(DisplayChangeEvents.DisplayPowerChangedEvent));
}
else if (evnt.Key == "OnMuteStateRecieved")
{
ev.AddEventHandler(d._projectors.fullClass, new EventHandler(DisplayChangeEvents.DisplayMuteChangedEvent));
}
// this id not work
// object classInstance = Activator.CreateInstance(d._projectors.fullClass);
// ev.AddEventHandler(classInstance, new EventHandler(DisplayChangeEvents.DisplayMuteChangedEvent));
//ev.AddEventHandler(d._projectors.fullClass, new EventHandler(DisplayChangeEvents.DisplayMuteChangedEvent));
//// this did not work either
//if (d._projectors._events.TryGetValue("OnPowerStateRecieved", out ev))
//{
// ev.AddEventHandler(ev.Name, new EventHandler(DisplayChangeEvents.DisplayPowerChangedEvent));
//}
}
获得以下例外:
指定的转换并不是有效的。
这类创造的活动看起来是这样的:
private static event EventHandler<PowerStateEventsArgs> _onPowerStateRecieved = delegate { };
[Information(Description = "Power Event")]
public static event EventHandler<PowerStateEventsArgs> OnPowerStateRecieved
{
add
{
if (!_onPowerStateRecieved.GetInvocationList().Contains(value))
{
_onPowerStateRecieved += value;
}
}
remove
{
_onPowerStateRecieved -= value;
}
}
该事件引发的事件看起来是这样的:
if (i == 1)
{
_onPowerStateRecieved(null, new PowerStateEventsArgs(true));
}
这一逻辑适用于所有其他程序,除了当我想到反映创建的类的动态。