How to retry until success or timeout asynchronously?

How to retry until success or timeout asynchronously?

I wrote down these lines of code:
public static bool RetryUntilSuccessOrTimeoutAsync(Func<bool> task,
TimeSpan executionTimeout, CancellationToken? token = null) { var data =
new ExecutionContextData(task, executionTimeout, token);
var nonBlockingTask = new Task<bool>(SyncTaskExecutor, data);
nonBlockingTask.Start();
var result = nonBlockingTask.ContinueWith(t => t.Result);
return result.Result;
}
class ExecutionContextData {
private readonly Func<bool> task;
private readonly TimeSpan executionTimeout;
private readonly CancellationToken? cancellationToken;
public ExecutionContextData(Func<bool> task, TimeSpan
executionTimeout, CancellationToken? cancellationToken) {
this.cancellationToken = cancellationToken;
this.executionTimeout = executionTimeout;
this.task = task;
}
public Func<bool> Task {
get { return task; }
}
public TimeSpan ExecutionTimeout {
get { return executionTimeout; }
}
public CancellationToken? CancellationToken {
get { return cancellationToken; }
}
}
But as I understand the Result property invokation will block a caller.
So, I quite don't understand how to accomplish this task: "How to execute
a task asynchronously, so if timeout is exceeded then it will return false
or it will return the result of the task which should be executed over and
over again?"