C# 用反射动态绑定事件
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Reflection; using System.Diagnostics; namespace WebApplication5 { public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { EventHandler clickHandler = delegate(object s, EventArgs x) { var ctrl = s as WebControl; Debug.Print(ctrl.ID); }; var click = Button1.GetType().GetEvents().FirstOrDefault(ei => ei.Name.ToLower() == "click"); var handler = Delegate.CreateDelegate(clickHandler.GetType(), clickHandler.Method); click.AddEventHandler(Button1, handler); } } }
使用预定义委托:
public void registerUserActionLog(Control ctrl) { var click = ctrl.GetType().GetEvents().FirstOrDefault(ei => ei.Name.ToLower() == "click"); if (click != null) { var method = this.GetType().GetMethod("ctrl_Click"); var handler = Delegate.CreateDelegate(click.EventHandlerType, this, method); click.AddEventHandler(ctrl, handler); } foreach (Control c in ctrl.Controls) { registerUserActionLog(c); } } public void ctrl_Click(object sender, EventArgs e) { var ctrl = sender as WebControl; OMSLogManager.UserActionLogger.log(this.GetType().Name + "\t" + ctrl.ID + ".Click"); }
动态调整事件处理程序的调用顺序:
public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { var method = this.GetType().GetMethod("ctrl_Click"); var click = Button1.GetType().GetEvents().FirstOrDefault(ei => ei.Name.ToLower() == "click"); var handler = Delegate.CreateDelegate(click.EventHandlerType, null, method); var handlerList = new List<Delegate>(); PropertyInfo propertyInfo = Button1.GetType().GetProperty("Events", BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance); EventHandlerList eventHandlerList = propertyInfo.GetValue(Button1, new object[] { }) as EventHandlerList; FieldInfo fieldInfo = typeof(Button).GetField("EventClick", BindingFlags.NonPublic | BindingFlags.Static); if(fieldInfo == null) fieldInfo = typeof(Button).GetField("Click", BindingFlags.NonPublic | BindingFlags.Static); if (fieldInfo != null) { object eventKey = fieldInfo.GetValue(Button1); var del = eventHandlerList[eventKey] as Delegate; foreach (var h in del.GetInvocationList()) { //preserve previous eventhandler handlerList.Add(h); //remove previous eventhandler click.RemoveEventHandler(Button1, h); } } //add new eventhandler click.AddEventHandler(Button1, handler); //add previous eventhandler foreach (var h in handlerList) { click.AddEventHandler(Button1, h); } } public void ctrl_Click(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e) { } }
桂棹兮兰桨,击空明兮溯流光。
【推荐】编程新体验,更懂你的AI,立即体验豆包MarsCode编程助手
【推荐】凌霞软件回馈社区,博客园 & 1Panel & Halo 联合会员上线
【推荐】抖音旗下AI助手豆包,你的智能百科全书,全免费不限次数
【推荐】博客园社区专享云产品让利特惠,阿里云新客6.5折上折
【推荐】轻量又高性能的 SSH 工具 IShell:AI 加持,快人一步
· 浏览器原生「磁吸」效果!Anchor Positioning 锚点定位神器解析
· 没有源码,如何修改代码逻辑?
· 一个奇形怪状的面试题:Bean中的CHM要不要加volatile?
· [.NET]调用本地 Deepseek 模型
· 一个费力不讨好的项目,让我损失了近一半的绩效!
· 微软正式发布.NET 10 Preview 1:开启下一代开发框架新篇章
· 没有源码,如何修改代码逻辑?
· PowerShell开发游戏 · 打蜜蜂
· 在鹅厂做java开发是什么体验
· WPF到Web的无缝过渡:英雄联盟客户端的OpenSilver迁移实战