/// <summary>
/// Posts the given action to the given SynchronizationContext also if it is null.
/// If it is null, then a new task will be started.
/// </summary>
/// <param name="syncContext">The context to send the action to.</param>
/// <param name="actionToPost">The action to be executed on the target thread.</param>
/// <param name="actionIfNull">What should we do if weg get no SyncContext?</param>
public static void PostAlsoIfNull(
this SynchronizationContext?syncContext,
Action actionToPost,
ActionIfSyncContextIsNull actionIfNull = ActionIfSyncContextIsNull.InvokeUsingNewTask)
{
if (syncContext != null)
{
syncContext.Post((_) => actionToPost(), null);
}
else
{
switch (actionIfNull)
{
case ActionIfSyncContextIsNull.InvokeSynchronous:
actionToPost();
break;
case ActionIfSyncContextIsNull.InvokeUsingNewTask:
Task.Factory.StartNew(actionToPost);
break;
case ActionIfSyncContextIsNull.DontInvoke:
break;
default:
throw new ArgumentException("actionIfNull", "Action " + actionIfNull + " unknown!");
}
}
}
/// <summary>
/// Post the given action in an async manner to the given SynchronizationContext.
/// </summary>
/// <param name="syncContext">The target SynchronizationContext.</param>
/// <param name="actionToPost">The action to be executed on the target thread.</param>
/// <param name="actionIfNull">What should we do if we get no SyncContext?</param>
public static Task PostAlsoIfNullAsync(
this SynchronizationContext?syncContext,
Action actionToPost,
ActionIfSyncContextIsNull actionIfNull = ActionIfSyncContextIsNull.InvokeUsingNewTask)
{
TaskCompletionSource <object?> completionSource = new(TaskCreationOptions.RunContinuationsAsynchronously);
syncContext.PostAlsoIfNull(() =>
{
try
{
actionToPost();
completionSource.SetResult(null);
}
catch (Exception ex)
{
completionSource.SetException(ex);
}
},
actionIfNull);
return(completionSource.Task);
}
/// <summary>
/// Post the given action in an async manner to the given SynchronizationContext.
/// </summary>
/// <param name="syncContext">The target SynchronizationContext.</param>
/// <param name="postAction">The action to be posted.</param>
/// <param name="actionIfNull">What should we do if we get no SyncContext?</param>
public static Task PostAlsoIfNullAsync(this SynchronizationContext syncContext, Action postAction, ActionIfSyncContextIsNull actionIfNull)
{
TaskCompletionSource <object> completionSource = new TaskCompletionSource <object>();
syncContext.PostAlsoIfNull(() =>
{
try
{
postAction();
completionSource.SetResult(null);
}
catch (Exception ex)
{
completionSource.SetException(ex);
}
},
actionIfNull);
return(completionSource.Task);
}
