Question

我正在为现有功能添加新的Web API调用。我想进行此API调用async，但看起来它会导致死锁。如果我想制作不可能的整个代码频道async，我必须做出更多更改。

我的问题是：

是否可以从常规方法调用async方法？
我在这里缺少什么？或者这里的正确方法是什么？

代码：

// Exisitng Method
public Tuple<RestaurantDeliveryProvider, DeliveryHubResult, Task<DeliveryManagerQuoteResponse>> CreateDeliveryRequest(OrderContextDTO orderContextDto)
{
    var provider = RestaurantBl.GetDeliveryProviderInformationByRestaurantId(orderContextDto.RestaurantId ?? 0);

    var deliveryHubResult = RestaurantBl.GetDeliveryHubResult(orderContextDto.OrderId ?? 0);;

    // New Call which always comes back with "Not Yet Computed" result
    Task<DeliveryManagerQuoteResponse> deliveryManagerQuoteResponse = _deliveryManager.CreateQuoteRequestAsync(orderContextDto, orderInfo);

    return Tuple.Create(provider, deliveryHubResult, deliveryManagerQuoteResponse);
}

异步方法：

public async Task<DeliveryManagerQuoteResponse> CreateQuoteRequestAsync(OrderContextDTO orderContextDto, OrderInfoDTO orderInfo)
{
    DeliveryManagerQuoteResponse deliveryManagerQuoteResponse = null;

    try
    {
        var restaurantInfo = RestaurantApi.GetRestaurant(orderInfo.RestaurantId);
        var quoteRequest = new DeliveryManagerQuoteRequest
        {
            DeliveryProvider = null, 
            Country = orderContextDto.DeliveryEstimateRequestDto.RequestedDeliveryAddress.Country,
            Concept = "BK", 
            StoreName = "BK-TEST-US-4", 
            OrderId = orderInfo.OrderId.ToString(),
            AllowCash = false, 
            PaymentType = OrderPaymentType.Prepaid_Credit,
            Note = orderInfo.DeliveryInstructions,
        };

        deliveryManagerQuoteResponse = await Quote(quoteRequest);
    }
    catch (Exception ex)
    {
        Log.ErrorFormat("Get Delivery Manager Quote failed: Error: {0}, OrderId: {1}", ex.Message, orderContextDto.OrderId);
    }

    return deliveryManagerQuoteResponse;
}


public async Task<DeliveryManagerQuoteResponse> Quote(DeliveryManagerQuoteRequest quoteRequest)
{
    DeliveryManagerQuoteResponse deliveryManagerQuoteResponse;

    var client = HttpClientFactory.GetClient();
    var content = HttpClientFactory.JsonContentFactory.CreateJsonContent(quoteRequest);
    var response = await client.PostAsync("https://myUrl", content);

    if (response.IsSuccessStatusCode)
    {
        var data = await response.Content.ReadAsStringAsync();
        deliveryManagerQuoteResponse = JsonConvert.DeserializeObject<DeliveryManagerQuoteResponse>(data);
    }
    else
    {
        throw new Exception((int)response.StatusCode + "-" + response.StatusCode);
    }

    return deliveryManagerQuoteResponse;
}

我也尝试过以下相同的结果：

public async Task<DeliveryManagerQuoteResponse> Quote(DeliveryManagerQuoteRequest quoteRequest)
{
    DeliveryManagerQuoteResponse deliveryManagerQuoteResponse;

    using (var client = new HttpClient())
    {
        var content = HttpClientFactory.JsonContentFactory.CreateJsonContent(quoteRequest);
        var response = await client.PostAsync("https://myUrl", content);

        if (response.IsSuccessStatusCode)
        {
            var data = await response.Content.ReadAsStringAsync();
            deliveryManagerQuoteResponse = JsonConvert.DeserializeObject<DeliveryManagerQuoteResponse>(data);
        }
        else
        {
            throw new Exception((int)response.StatusCode + "-" + response.StatusCode);
        }
    }

    return deliveryManagerQuoteResponse;
}

输出（抱歉输出模糊，如果点击它，你会看到清晰的结果）：

Answer 1

别＆＃39;吨
别＆＃39;吨

基本上，有一种没有好的或可行的方式从同步方法调用异步方法并等待答案。有异步＆＃34;同步，但这是反模式，应该积极避免。

所以：

将来电者重写为async
实现API的同步版本

如何在C＃中同步调用异步方法？

1 个答案: