C# 动态加载dll事件处理

在处理dll动态加载时，遇到事件不会处理。特记录下这篇，供后期查看。

dll代码：

namespace ClassLibrary
{
    public class Class1
    {
        public delegate void callback_delegate(string str);
        public event callback_delegate callback_event;
        public void Fun5(string str)
        {
            ShowCallBack();
        }
        public void ShowCallBack()
        {
            if(callback_event != null)
            {
                callback_event("aaaaaaaaa");
            }
        }
    }
}

调用代码：

            Assembly assembly = Assembly.LoadFile(m_dll_path);
            Type type = assembly.GetType("ClassLibrary.Class1");
            //带参数构造函数 Object obj = Activator.CreateInstance(type，new object[]{"1"});
            Object obj = Activator.CreateInstance(type);
            BindingFlags mybindingFlags = BindingFlags.Instance | BindingFlags.Public;
            EventInfo eventInfo = obj.GetType().GetEvent("callback_event", mybindingFlags);
            //绑定自己的方法
            var mycallback = typeof(Form1).GetMethod("ShowMsg",BindingFlags.Static|BindingFlags.NonPublic);
            Delegate del = Delegate.CreateDelegate(eventInfo.EventHandlerType,null, mycallback);
            eventInfo.AddEventHandler(obj,del);
            MethodInfo methodInfo = type.GetMethod("Fun5");
            string ret = methodInfo.Invoke(obj, new object[] { "123"}) as string;