Calling Asynchronous method after certain time has passed

Question

I have the following code in .Net C# that makes a call, and then evaluates the response. If the response is Pending, I want to wait 2 seconds, and make the call again.

I do not know how to do the "Wait 2 seconds" here, or how to use a timer that works with the synchronous method.

I am limited by the constraints of a PCL project.

private async Task<Response> ExecuteTask(Request request)
{
    var response = await GetResponse();

    switch(response.Status)
    {
        case ResponseStatus.Pending:
            //wait 2 seconds
            response = await ExecuteTask(request);
    }
    return response;
}

Would the following code be ok?

System.Threading.Timer timer;

private async Task<Response> ExecuteTask(Request request)
{
    var response = await GetResponse();

    switch(response.Status)
    {
        case ResponseStatus.Pending:
        timer = new System.Threading.Timer(async obj =>
        {
            response = await ExecuteTask(request);
        }, null, 1000, System.Threading.Timeout.Infinite);
    }
    return response;
}

Answer 1

In async you wait using Task.Delay

private async Task<Response> ExecuteTask(Request request)
{
    var response = await GetResponse();

    switch(response.Status)
    {
        case ResponseStatus.Pending:
            await Task.Delay(TimeSpan.FromSeconds(2))
            response = await ExecuteTask(request);
            break;
    }
    return response;
}