Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / AppModel / returneventsaver.cs / 1 / returneventsaver.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // This class provides a convenient way to persist/depersist the events on a PageFunction // // By calling the _Detach() method on a pagefunction, // this class will build a list of the class & methods on that Pagefunction, // as well as removing the current listener on the class when it's done. // // By passing in a pagefunction on the _Attach method, the class will reattach the // saved list to the calling pagefunction // // History: // 06/11/03: [....] created // //--------------------------------------------------------------------------- using System; using System.Windows.Navigation; using System.Windows; using System.Diagnostics; using System.Collections; using System.Reflection; using System.IO; using System.Security.Permissions; using System.Security; namespace MS.Internal.AppModel { [Serializable] internal struct ReturnEventSaverInfo { internal ReturnEventSaverInfo(string delegateTypeName, string targetTypeName, string delegateMethodName, bool fSamePf) { _delegateTypeName = delegateTypeName; _targetTypeName = targetTypeName; _delegateMethodName = delegateMethodName; _delegateInSamePF = fSamePf; } internal String _delegateTypeName; internal String _targetTypeName; internal String _delegateMethodName; internal bool _delegateInSamePF; // Return Event handler comes from the same pagefunction, this is for non-generic workaround. } [Serializable] internal class ReturnEventSaver { internal ReturnEventSaver() { } ////// Critical - sets the critical _returnList. /// TreatAsSafe - _returnList is not exposed in any way. /// [SecurityCritical, SecurityTreatAsSafe] internal void _Detach(PageFunctionBase pf) { if (pf._Return != null && pf._Saver == null) { ReturnEventSaverInfo[] list = null; Delegate[] delegates = null; delegates = (pf._Return).GetInvocationList(); list = _returnList = new ReturnEventSaverInfo[delegates.Length]; for (int i = 0; i < delegates.Length; i++) { Delegate returnDelegate = delegates[i]; bool bSamePf = false; if (returnDelegate.Target == pf) { // This is the Event Handler implemented by the same PF, use for NonGeneric handling. bSamePf = true; } MethodInfo m = returnDelegate.Method; ReturnEventSaverInfo info = new ReturnEventSaverInfo( returnDelegate.GetType().AssemblyQualifiedName, returnDelegate.Target.GetType().AssemblyQualifiedName, m.Name, bSamePf); list[i] = info; } // // only save if there were delegates already attached. // note that there will be cases where the Saver has already been pre-populated from a Load // but no delegates have been created yet ( as the PF hasn`t called finish as yet) // // By only storing the saver once there are delegates - we avoid the problem of // wiping out any newly restored saver pf._Saver = this; } pf._DetachEvents(); } // // Attach the stored events to the supplied pagefunction. // // caller - the Calling Page's root element. We will reattach events *from* this page root element *to* the child // // child - the child PageFunction. Caller was originally attached to child, we're now reattaching *to* the child // ////// Critical - Asserts ReflectionPermission to be able re-create delegate to private method. /// TreatAsSafe - The delegate created is identical to the one that _Detach() received from /// the application and saved. This is ensured by matching the type of the original target /// object against the type of the new target. Thus we know that the application was able /// to create a delegate over the exact method, and even if that method had a LinkDemand, /// it was satisfied by the application. /// [SecurityCritical, SecurityTreatAsSafe] internal void _Attach(Object caller, PageFunctionBase child) { ReturnEventSaverInfo[] list = null; list = _returnList; if (list != null) { Debug.Assert(caller != null, "Caller should not be null"); for (int i = 0; i < list.Length; i++) { // // Invariant.Assert(string.Compare(_returnList[i]._targetTypeName, caller.GetType().AssemblyQualifiedName, StringComparison.Ordinal) == 0, "The type of the PageFunction's invoking page unexpectedly changed. Expected: " + _returnList[i]._targetTypeName); Delegate d; try { new ReflectionPermission(ReflectionPermissionFlag.MemberAccess).Assert(); // BlessedAssert d = Delegate.CreateDelegate( Type.GetType(_returnList[i]._delegateTypeName), caller, _returnList[i]._delegateMethodName); } catch (Exception ex) { throw new NotSupportedException(SR.Get(SRID.ReturnEventHandlerMustBeOnParentPage), ex); } finally { ReflectionPermission.RevertAssert(); } child._AddEventHandler(d); } } } ////// Critical: contains metadata for delegates created under elevation. /// [SecurityCritical] private ReturnEventSaverInfo[] _returnList; // The list of delegates we want to persist and return later } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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