C#反射调用其它DLL的委托事件 传值

在插件式开发。我们要调用其它插件或模块的委托事件时、那么我们需要通过反射。

namespace Module2
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    [Plugin("MainWindow", "测试反射")]
    public partial class MainWindow 
    {
        public delegate void TestHandler(string msg,string info,string text);
        public event TestHandler TestEvent;

        public MainWindow()
        {
            InitializeComponent();
        }

        protected virtual void ValueInformation(string text, string info, string tb)
        {
            TestHandler handler = TestEvent;
            if (handler != null)
                handler(text,info,tb);
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            if (TestEvent != null)
            {
            }
            ValueInformation("你好!钓鱼岛是中国的!!","打死小日本！！",textBox1.Text);
        }

        public override void UninstallEvent()
        { 
            //添加已经打开的窗口 :在关闭的时候 要删除此项
            ApplicationSharedData.LoadedPlugins.Remove("Module2.MainWindow");
            base.UninstallEvent();
        }
    }
}

 

/// <summary>
        /// 模块之间 委托事件 通信
        /// </summary>
        /// <param name="currentWindow">当前的Window</param>
        /// <param name="reflectioneventName">要反射模块中的 委托事件名称</param>
        /// <param name="currentEventName">在当前类中要执行的事件名称</param>
        /// <param name="filePath">反射文件的路经</param>
        /// <param name="plugin">插件</param>
        /// <param name="eventParameter">通信的消息</param>
        public static void ModulEventCommunication(Window currentWindow, string reflectioneventName,
                                                   string currentEventName, string filePath, Plugin plugin,
                                                   object[] eventParameter)
        {
            if (reflectioneventName == null)
                throw new ArgumentNullException("reflectioneventName");
            if (currentEventName == null)
                throw new ArgumentNullException("currentEventName");
            if (filePath == null)
                throw new ArgumentNullException("filePath");
            if (eventParameter == null)
                throw new ArgumentNullException("eventParameter");
            try
            {
                Assembly assembly = Assembly.LoadFrom(filePath + plugin.NameSpace + "." + plugin.Exends);
                Type[] type = assembly.GetTypes();
                foreach (Type t in type)
                {
                    //主要是判断该窗口是否实现 IElementsView 如果没有实现 就不需要反射或者不是插件 
                    if (t.GetInterface("IElementsView") != null && t.Name == plugin.ClassName)
                    {
                        //注：在这里要判断是否已经加载：
                        if (LoadedPlugins.Contains(t.FullName))
                        {
                            return;
                        }
                        //反射执行的成员和类型搜索
                        const BindingFlags myBindingFlags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static;
                        EventInfo eventInfo = t.GetEvent(reflectioneventName, myBindingFlags);
                        //获取到当前的类
                        var obj = (IElementsView)assembly.CreateInstance(t.FullName);
                        if (eventInfo != null)
                        {
                            Type tDelegate = eventInfo.EventHandlerType;
                            MethodInfo methodHandler = currentWindow.GetType().GetMethod(currentEventName,myBindingFlags);
                            //创建委托
                            Delegate d = Delegate.CreateDelegate(tDelegate, methodHandler);
                            //获取将要处理的事件委托
                            MethodInfo minAddHandler = eventInfo.GetAddMethod();
                            object[] addHandlerArgs = { d };
                            //调用
                            minAddHandler.Invoke(obj, addHandlerArgs);
                            FieldInfo field = t.GetField(reflectioneventName,
                                                        myBindingFlags);
                            if (field != null)
                            {
                                Object fieldValue = field.GetValue(obj);
                                if (fieldValue != null && fieldValue is Delegate)
                                {
                                    Delegate objectDelegate = fieldValue as Delegate;
                                    //动态调用
                                    objectDelegate.DynamicInvoke(eventParameter);
                                }
                            }
                        }
                        if (obj != null)
                        {
                            obj.ShowWindow();
                            //添加已经打开的窗口 :在关闭的时候 要删除此项
                            LoadedPlugins.Add(t.FullName);
                        }
                    }
               
                }
            }
            catch (FileNotFoundException)
            {
                MessageBox.Show("尊敬的用户您好！没有找到相应的模块！", "插件提示！", MessageBoxButton.OK,
                                  MessageBoxImage.Information);
            }
            catch (TargetParameterCountException)
            {
                MessageBox.Show("尊敬的用户您好！在调用模块时发现委托的参数不同！请检查参数的个数！", "插件提示!", MessageBoxButton.OK,
                                MessageBoxImage.Information);
            }
            catch (Exception)
            {
                MessageBox.Show("尊敬的用户您好！系统发现版本与当前系统不匹配！", "插件提示！", MessageBoxButton.OK,
                                MessageBoxImage.Information);
            }
        }

本模块调用：

 void Test2_Click(object sender, RoutedEventArgs e)
        {
            var item = (MenuItem)sender;
            string path = @Environment.CurrentDirectory + "\\";
            Plugin plugin = ApplicationSharedData.Plugins[item.Header.ToString()];

            ApplicationSharedData.ModulEventCommunication(this, "TestEvent", "DeleBindData", path, plugin, new object[] { "参数1", "参数2","" });
            //注 在反射TestEvent 时候 ，TestEvent有几个参数 那么S_TestEvent 也有几个参数。
            //不然会抛出异常信息，TargetParameterCountException 参数的个数不同
        }


        private static void DeleBindData(string msg, string info,string tb)
        {
            _textbox.Text = tb;
        }

此代码是我在一次开发中遇到的问题。。在这里做个备注 ，防止下次忘记了。。