SetSynchronizationContext(SynchronizationContext syncContext,
SynchronizationContext prevSyncContext)
{
// get current execution context
ExecutionContext ec = Thread.CurrentThread.ExecutionContext;
// create a switcher
SynchronizationContextSwitcher scsw = new SynchronizationContextSwitcher();
RuntimeHelpers.PrepareConstrainedRegions();
try
{
// attach the switcher to the exec context
scsw._ec = ec;
// save the current sync context using the passed in value
scsw.savedSC = prevSyncContext;
// save the new sync context also
scsw.currSC = syncContext;
// update the current sync context to the new context
ec.SynchronizationContext = syncContext;
}
catch
{
// Any exception means we just restore the old SyncCtx
scsw.UndoNoThrow(); //No exception will be thrown in this Undo()
throw;
}
// return switcher
return(scsw);
}
public override bool Equals(Object obj)
{
if (obj == null || !(obj is SynchronizationContextSwitcher))
{
return(false);
}
SynchronizationContextSwitcher sw = (SynchronizationContextSwitcher)obj;
return(this.savedSC == sw.savedSC &&
this.currSC == sw.currSC && this._ec == sw._ec);
}