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//------------------------------------------------------------------------------
// <copyright file="AsyncOperationManager.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.ComponentModel
{
using System.Collections;
using System.Threading;
using System.Diagnostics;
using System.Security.Permissions;
[HostProtection(SharedState = true)]
public static class AsyncOperationManager {
public static AsyncOperation CreateOperation(object userSuppliedState) {
return AsyncOperation.CreateOperation(userSuppliedState, SynchronizationContext);
}
/// <include file='doc\AsyncOperationManager.uex' path='docs/doc[@for="AsyncOperationManager.SynchronizationContext"]/*' />
[EditorBrowsable(EditorBrowsableState.Advanced)]
public static SynchronizationContext SynchronizationContext {
get {
if (SynchronizationContext.Current == null) {
SynchronizationContext.SetSynchronizationContext(new SynchronizationContext());
}
return SynchronizationContext.Current;
}
#if SILVERLIGHT
// a thread should set this to null when it is done, else the context will never be disposed/GC'd
[SecurityCritical]
[FriendAccessAllowed]
internal set {
SynchronizationContext.SetSynchronizationContext(value);
}
#else
// a thread should set this to null when it is done, else the context will never be disposed/GC'd
[PermissionSetAttribute(SecurityAction.LinkDemand, Name="FullTrust")]
set {
SynchronizationContext.SetSynchronizationContext(value);
}
#endif
}
}
}
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