Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / SynchronizationContextHelper.cs / 1305376 / SynchronizationContextHelper.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.Activities { using System.Runtime; using System.Threading; using System.Security; static class SynchronizationContextHelper { static WFDefaultSynchronizationContext defaultContext; public static SynchronizationContext GetDefaultSynchronizationContext() { if (SynchronizationContextHelper.defaultContext == null) { SynchronizationContextHelper.defaultContext = new WFDefaultSynchronizationContext(); } return SynchronizationContextHelper.defaultContext; } public static SynchronizationContext CloneSynchronizationContext(SynchronizationContext context) { Fx.Assert(context != null, "null context parameter"); WFDefaultSynchronizationContext wfDefaultContext = context as WFDefaultSynchronizationContext; if (wfDefaultContext != null) { Fx.Assert(SynchronizationContextHelper.defaultContext != null, "We must have set the static member by now!"); return SynchronizationContextHelper.defaultContext; } else { return context.CreateCopy(); } } class WFDefaultSynchronizationContext : SynchronizationContext { public WFDefaultSynchronizationContext() { } public override void Post(SendOrPostCallback d, object state) { new SendOrPostCallbackActionItem(d, state).PostWithNoContext(); } public override void Send(SendOrPostCallback d, object state) { d(state); } class SendOrPostCallbackActionItem : ActionItem { SendOrPostCallback callback; object state; public SendOrPostCallbackActionItem(SendOrPostCallback callback, object state) { this.callback = callback; this.state = state; } public void PostWithNoContext() { base.ScheduleWithoutContext(); } protected override void Invoke() { this.callback(state); } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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