C# 用反射动态绑定事件
2017-02-15 10:44
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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) { } }
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