Code:
/ DotNET / DotNET / 8.0 / untmp / Orcas / RTM / ndp / fx / src / xsp / System / Web / Extensions / ui / AsyncPostBackTrigger.cs / 2 / AsyncPostBackTrigger.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI { using System; using System.ComponentModel; using System.Diagnostics.CodeAnalysis; using System.Globalization; using System.Reflection; using System.Security.Permissions; using System.Web; using System.Web.UI; using System.Web.Resources; using System.Web.Util; [ AspNetHostingPermission(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal), AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal) ] public class AsyncPostBackTrigger : UpdatePanelControlTrigger { private IScriptManagerInternal _scriptManager; private Control _associatedControl; private static MethodInfo _eventHandler; private bool _eventHandled; private string _eventName; public AsyncPostBackTrigger() { } internal AsyncPostBackTrigger(IScriptManagerInternal scriptManager) { _scriptManager = scriptManager; } private static MethodInfo EventHandler { get { if (_eventHandler == null) { _eventHandler = typeof(AsyncPostBackTrigger).GetMethod("OnEvent"); } return _eventHandler; } } [ SuppressMessage("Microsoft.Naming", "CA1706:ShortAcronymsShouldBeUppercase"), TypeConverter("System.Web.UI.Design.AsyncPostBackTriggerControlIDConverter, " + AssemblyRef.SystemWebExtensionsDesign) ] public new string ControlID { get { return base.ControlID; } set { base.ControlID = value; } } [ DefaultValue(""), Category("Behavior"), ResourceDescription("AsyncPostBackTrigger_EventName"), TypeConverter("System.Web.UI.Design.AsyncPostBackTriggerEventNameConverter, " + AssemblyRef.SystemWebExtensionsDesign), ] public string EventName { get { if (_eventName == null) { return String.Empty; } return _eventName; } set { _eventName = value; } } internal IScriptManagerInternal ScriptManager { get { if (_scriptManager == null) { Page page = Owner.Page; if (page == null) { throw new InvalidOperationException(AtlasWeb.Common_PageCannotBeNull); } _scriptManager = UI.ScriptManager.GetCurrent(page); if (_scriptManager == null) { throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.Common_ScriptManagerRequired, Owner.ID)); } } return _scriptManager; } } protected internal override void Initialize() { base.Initialize(); _associatedControl = FindTargetControl(true); ScriptManager.RegisterAsyncPostBackControl(_associatedControl); string eventName = EventName; if (eventName.Length != 0) { // If EventName is specified, attach our event handler to it EventInfo eventInfo = _associatedControl.GetType().GetEvent(eventName, BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.Public); if (eventInfo == null) { throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.AsyncPostBackTrigger_CannotFindEvent, eventName, ControlID, Owner.ID)); } MethodInfo handlerMethod = eventInfo.EventHandlerType.GetMethod("Invoke"); ParameterInfo[] parameters = handlerMethod.GetParameters(); if (!handlerMethod.ReturnType.Equals(typeof(void)) || (parameters.Length != 2) || (typeof(EventArgs).IsAssignableFrom(parameters[1].ParameterType) == false)) { throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.AsyncPostBackTrigger_InvalidEvent, eventName, ControlID, Owner.ID)); } Delegate handler = Delegate.CreateDelegate(eventInfo.EventHandlerType, this, EventHandler); eventInfo.AddEventHandler(_associatedControl, handler); } } protected internal override bool HasTriggered() { if (!String.IsNullOrEmpty(EventName)) { // If EventName is specified we are triggered if our event was raised return _eventHandled; } else { // If EventName is not specified, check if the control that caused the // postback either has the exact UniqueID we're looking for, or at least // begins with it. string sourceElement = ScriptManager.AsyncPostBackSourceElementID; return (sourceElement == _associatedControl.UniqueID) || (sourceElement.StartsWith(_associatedControl.UniqueID + "$", StringComparison.Ordinal)); } } // DevDiv Bugs 127369: This method should be private and the reflection lookup should assert reflection permission // so the private reflection works in medium trust. // However, ASP.NET AJAX 1.0 was released with this method public. Since it would be a breaking change to make it private // now, it was decided to leave it as is. [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers", Justification="TODO: This will be fixed in fc_serverfx")] public void OnEvent(object sender, EventArgs e) { _eventHandled = true; } [SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase")] public override string ToString() { if (String.IsNullOrEmpty(ControlID)) { return "AsyncPostBack"; } else { return "AsyncPostBack: " + ControlID + (String.IsNullOrEmpty(EventName) ? String.Empty : ("." + EventName)); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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