Question

我是.net中的Threading的新手，我正在维护一个用MVC 5编写的应用程序。该应用程序有一个静态Utility类，它有一个静态PostRequests方法来处理Web客户端请求。在网页上，我启动了3个线程，它们将调用此静态方法从3个不同的源获取数据。

每个Webclient请求的超时时间为45秒。但其中一个线程只打印约30秒的日志，并在没有完成工作的情况下死亡。我阅读了一些文章，其中写了引用变量需要使线程安全，我不知道该怎么做。我的问题是：方法线程安全吗？我在参数或访问变量的某个地方犯了错误吗？

这是方法

private static Stopwatch timer = new Stopwatch();

public static List<T> PostRequests<T>(string url, string querystring, Request request) where T : IResponse
    {
        try
        {
            if (string.IsNullOrWhiteSpace(querystring))
                querystring = "?apikey=" + AppSettings.APIAccessKey;
            else
                querystring = querystring + "&apikey=" + AppSettings.APIAccessKey;
            var timestamp = string.Format("{0:dd/MM/yyyy HH:mm}", DateTime.UtcNow);

            WsfWebClient client = new WsfWebClient();

            var headers = new WebHeaderCollection();
            headers.Add("timestamp", timestamp);
            headers.Add("Content-Type", "application/json");

            var message = Signer.BuildMessage(url, "POST", HttpUtility.ParseQueryString(querystring), timestamp);
            var signature = Signer.ComputeHash(AppSettings.APISecretKey, message);

            headers.Add("signature", signature);

            client.Headers = headers;                

            var json = request.ToJsonString();

            Logger.Debug(String.Format("SDK: Posting data to the API. JSON: {0}", json));

            timer.Start();
            var response = client.UploadData(AppSettings.APIUrl + url + querystring, "POST", Encoding.Default.GetBytes(json));
            timer.Stop();
            Logger.Info(string.Format("Time Spent for : WSF Call  - {0}", timer.Elapsed.Milliseconds.ToString()));

            return ParseListResponse<T>(Encoding.Default.GetString(response));
        }
        catch (Exception ex)
        {
            Logger.Error("SDK: Post Request to Builder API failed.", ex, typeof(Utilities));
            var responseObject = GetInstance<List<T>>();

            if (responseObject.Count > 0)
            {
                responseObject[0].GenerateError("", "Post Request to Builder API failed.", ex.StackTrace);
            }

            return responseObject;
        }
    }


public class WsfWebClient : WebClient
{
    protected override WebRequest GetWebRequest(Uri uri)
    {
        WebRequest request = base.GetWebRequest(uri);
        // Set timeout for 45 seconds
        request.Timeout = AppSettings.WsfWebClientTimeOut; 
        return request;
    }
}

.net threading：传递自定义类ref作为参数

0 个答案: