在继续进行Unity3d中的代码之前，等待网络调用完成

Question

I've read many articles but I don't seem to get it. I have this code working now because I hardcode a 3 second delay so there is enough time for the web call to finish so when the score is displayed there is data. But what I really want is to have the web call finish and THEN display the score. Help ?

 IEnumerator Start()
{
    client = new MobileServiceClient(_appUrl, _appKey);
    table = client.GetTable<Highscore>("Highscores");
    yield return StartCoroutine(ReadItems());
    DisplayScores();
}

void Update()
{

}

public void btn_GoBack()
{
    Application.LoadLevel("StartScene");
}

private void OnReadItemsCompleted(IRestResponse<List<Highscore>> response)
{
    if (response.StatusCode == HttpStatusCode.OK)
    {
        Debug.Log("OnReadItemsCompleted data: " + response.Content);
        List<Highscore> items = response.Data;
        Debug.Log("Read items count: " + items.Count);
        Scores = items;
    }
    else
    {
        Debug.Log("Error Status:" + response.StatusCode + " Uri: " + response.ResponseUri);
    }
}

private IEnumerator ReadItems()
{
    table.Read<Highscore>(OnReadItemsCompleted);
    yield return new WaitForSeconds(3);
}

private void DisplayScores()
{
    txtHighScores.text = "";
    int numberOfScores = Math.Min(Scores.Count, 5);

    for (int i = 0; i < numberOfScores; i++)
    {
        string name = Scores[i].username.ToString();
        string score = Scores[i].score.ToString();

        txtHighScores.text += (i + 1).ToString() + ". " +
                              " - " + name + "\r\n" +
                              score.ToString().PadLeft(4, '0');
    }
}

Answer 1

It is important to pass a parameter with Startcorutine method, Otherwise it gives error. So try my fix in your code.

 IEnumerator Start()
{
    client = new MobileServiceClient(_appUrl, _appKey);
    table = client.GetTable<Highscore>("Highscores");
    yield return StartCoroutine(ReadItems(2.0f)); //delay
    DisplayScores();
}

IEnumerator ReadItems(float delay)
{
    yield return new WaitForSeconds(delay);
    table.Read<Highscore>(OnReadItemsCompleted);

}

Answer 2

1. Remove the method call for " DisplayScores() " from Start()
2. And insert DisplayScores() as the last line of method callback OnReadItemsCompleted
3. And then you should remove the line yield return new WaitForSeconds(3);