dot net mvc5 控制器中的异步函数创建死锁

Posted 2023-02-22

【中文标题】dot net mvc5 控制器中的异步函数创建死锁

【英文标题】：Async function in dot net mvc5 controller creating deadlock

【发布时间】：2019-04-07 07:21:31

【问题描述】：

我正在将此库用于孟加拉国支付网关。https://github.com/Rahim373/Arts.SslCommerze .但是控制器中的代码等待iis无限时间。如果响应正确地从服务器到达我的机器，我检查了提琴手。它正在到达。但是异步函数没有执行。 我的代码是：

public ActionResult About()

        string customerName = "Fahim Abrar";
        string customerEmail = "[e-mail]";
        string customerPhone = "[phone]";
        string transactionId = "45c2ffc4d";
        string successUrl = "http://fahimabrar.com";
        string failUrl = "http://fahimabrar.com";
        string cancelUrl = "cancelUrl";
        decimal amount = 50;

        Customer customer = new Customer(customerName, customerEmail, 
        customerPhone);

        EmiTransaction emiTransaction = new 
        EmiTransaction(isEmiEnabled: false);

        Trasnaction trasnaction = new Trasnaction(amount, 
        transactionId, successUrl, failUrl,
            cancelUrl, emiTransaction, customer);

  SslRequest.GetSessionAsync(trasnaction).ConfigureAwait(continueOnCapturedContext: false);
        var session = SslRequest.GetSessionAsync(trasnaction).Result;
        string s = session.FailedReason;

        ViewBag.Message = s;
        //"Your application description page.";

        return View();

这里 var session = SslRequest.GetSessionAsync(trasnaction).Result; 此行导致死锁。

【参考方案1】：

.Result 会导致死锁。

将您的方法设为async 并使用await 例如

public async Task<ActionResult> About()

    string customerName = "Fahim Abrar";
    string customerEmail = "[e-mail]";
    string customerPhone = "[phone]";
    string transactionId = "45c2ffc4d";
    string successUrl = "http://fahimabrar.com";
    string failUrl = "http://fahimabrar.com";
    string cancelUrl = "cancelUrl";
    decimal amount = 50;

    Customer customer = new Customer(customerName, customerEmail, 
    customerPhone);

    EmiTransaction emiTransaction = new 
    EmiTransaction(isEmiEnabled: false);

    Trasnaction trasnaction = new Trasnaction(amount, 
    transactionId, successUrl, failUrl,
        cancelUrl, emiTransaction, customer);

    var session = await SslRequest.GetSessionAsync(trasnaction);
    string s = session.FailedReason;

    ViewBag.Message = s;
    //"Your application description page.";

    return View();

见：Using Asynchronous Methods in ASP.NET MVC

【讨论】：

给出错误“ 由于未等待此调用，因此在调用完成之前继续执行当前方法。考虑将'await'运算符应用于调用结果。

在哪里，@FahimAbrar？

在视觉工作室构建中

你想await那一行（并创建方法async Task<...>）；不要使用.Result