Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Utility / SponsorHelper.cs / 1305600 / SponsorHelper.cs
using System; using System.Diagnostics; using System.Runtime.Remoting; using System.Runtime.Remoting.Lifetime; using System.Security; using System.Security.Permissions; namespace MS.Internal.Utility { #region SponsorHelper Class ////// We either mark the Sponsor as MarshalByRef or make it serializable. /// If we make it MarshalByRef, then this sponsor which is used to control /// the lifetime of a MBR object in turn needs to have another sponsor OR /// the sponsor can mark itself to remain alive for the life of the AppDomain /// by overriding InitializeLifetimeService and returning null OR the object /// can be marked as Serializeable instead of MBR in which case it is marshaled /// by value to the client appdomain and will not have the state of the host /// appdomain to make renewal decisions. In our case we don't have any state so /// its easier and better perf-wise to mark it Serializable. /// [Serializable] internal class SponsorHelper : ISponsor { #region Private Data private ILease _lease; private TimeSpan _timespan; #endregion Private Data #region Constructor internal SponsorHelper(ILease lease, TimeSpan timespan) { Debug.Assert(lease != null && timespan != null, "Lease and TimeSpan arguments cannot be null"); _lease = lease; _timespan = timespan; } #endregion Constructor #region ISponsor Interface TimeSpan ISponsor.Renewal(ILease lease) { if (lease == null) { throw new ArgumentNullException("lease"); } return _timespan; } #endregion ISponsor Interface #region Internal Methods ////// Critical - asserts permission for RemotingConfiguration /// TreatAsSafe - The constructor for this object is internal and this function does not take /// random parameters and hence can�t be used to keep random objects alive or access any other object /// in the application. /// [SecurityCritical, SecurityTreatAsSafe] [SecurityPermissionAttribute(SecurityAction.Assert, RemotingConfiguration = true)] internal void Register() { _lease.Register((ISponsor)this); } ////// Critical - asserts permission for RemotingConfiguration /// TreatAsSafe - The constructor for this object is internal and this function does not take /// random parameters and hence can�t be used to keep random objects alive or access any other object /// in the application. /// [SecurityCritical, SecurityTreatAsSafe] [SecurityPermissionAttribute(SecurityAction.Assert, RemotingConfiguration = true)] internal void Unregister() { _lease.Unregister((ISponsor)this); } #endregion Internal Methods } #endregion SponsorHelper Class } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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