Question

我创建了一个类，该类具有一个计时器，该计时器调用在我的Azure帐户中创建的函数以返回天蓝色的状态，该返回值被缓存。在该类中，我有一个返回缓存值的WEB API。

我有Windows表单软件，该软件每分钟调用一次WEB API以获取状态。

这一切都可以在本地主机上进行开发，但不能在生产环境中使用。

[EnableCorsAttribute("*", "*", "*")]
public class AzureStatusController : ApiController
{
    private readonly int statusTimerInterval = 60 * 1000; // every 60 seconds

    private static bool cloudStatus = false;

    static HttpClient client;
    private static string url = "";
    private static string code = "";

    private System.Threading.Timer cloudTimer;

    /// <summary>
    /// Classes Ctor
    /// </summary>
    public AzureStatusController()
    {
        cloudTimer = new System.Threading.Timer(OnAzureStatusCallback, null, 0, statusTimerInterval);

        url = ConfigurationManager.AppSettings["CloudFunctionsBaseUrl"].ToString();
        code = ConfigurationManager.AppSettings["CloudStatusCode"].ToString();
        client = new HttpClient();
        client.BaseAddress = new Uri(url);
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    }

    private void OnAzureStatusCallback(object state)
    {
        var status = false;
        if (client != null && client.BaseAddress.ToString().Length > 30 && code.Length > 70)
        {
            try
            {
                var response = client.GetAsync(code);
                if (response != null && !response.IsFaulted)
                {
                    var result = response.Result;
                    if (result != null && result.IsSuccessStatusCode && result.Content != null)
                    {
                        string responseString = result.Content.ReadAsStringAsync().Result.Trim().ToLower();
                        status = (responseString.Contains("ok"));
                    }
                }
            }
            catch
            {
                status = false;
            }
        }
        cloudStatus = status;
    }

    /// <summary>
    /// Returns the cached value of the Azure status
    /// </summary>
    /// <returns></returns>
    [AllowAnonymous]
    [HttpGet]
    [Route("api/AzureStatus")]
    public IHttpActionResult Get()
    {
        return Ok(cloudStatus);
    }
}

有人知道我可能会缺少什么吗？

Answer 1

最终我发现在我的ConfigurationManager.AppSettings调用的末尾添加.ToString（）会在生产中引起问题，但在开发中不会引起问题。我没有花更多的时间在这个问题上，而是使用了以下代码：

public class AzureStatusController : ApiController
{
    private static bool cloudStatus = false;
    private static DateTime expiration;

    /// <summary>
    /// Classes Ctor
    /// </summary>
    public AzureStatusController()
    {
        expiration = DateTime.Now.AddHours(-1);
    }

    private void CheckAzureStatus()
    {
        var status = false;
        using (var client = new HttpClient())
        {
            // the following 2 lines should be changed to retrieve the info from 
            var url = ConfigurationManager.AppSettings["CloudFunctionsBaseUrl"];
            var code = ConfigurationManager.AppSettings["CloudStatusCode"];
            client.BaseAddress = new Uri(url);
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            try
            {
                var response = client.GetAsync(code);
                if (response != null && !response.IsFaulted)
                {
                    var result = response.Result;
                    if (result != null && result.IsSuccessStatusCode && result.Content != null)
                    {
                        string responseString = result.Content.ReadAsStringAsync().Result.Trim().ToLower();
                        status = (responseString.Contains("ok"));
                    }
                }
            }
            catch
            {
                status = false;
            }
        }
        cloudStatus = status;
        expiration = DateTime.Now.AddMinutes(1);
    }

    /// <summary>
    /// Returns the cached value of the Azure status
    /// </summary>
    /// <returns></returns>
    [AllowAnonymous]
    [HttpGet]
    [Route("api/AzureStatus")]
    public IHttpActionResult Get()
    {
        if (expiration < DateTime.Now)
        {
            CheckAzureStatus();
        }
        return Ok(cloudStatus);
    }
}

以下内容在本地主机上进行开发，但在生产中不起作用

1 个答案: