Question

我正在我的WebAPI应用程序的业务层中进行PostAsync调用。

使用AutoFac我正在设置我的绑定：

builder.RegisterGeneric(typeof(SqlServerRepository<>))
       .As(typeof(IRepository<>))
       .InstancePerLifetimeScope();
builder.RegisterType<WspSQLDbContext>()
       .As<DbContext>()
       .InstancePerLifetimeScope();

将存储库注入控制器：

public KenSciConnector(log4net.ILog logger, IRepository<KenSciBatch> kensciBatchRepository) {
    _logger = logger;
    _kensciBatchRepository = kensciBatchRepository;
}

调用异步函数的函数如下所示：

public Response SendToVendor(Observation observation) {
    Response batchingResponse;
    // some logic
    var sendResponse = SendToKensci(requestObject, batch);           
    return batchingResponse;
}

...实际进行异步调用的函数如下所示：

private async Task<Response> SendToKensci(KenSciRequest requestObject, KenSciBatch kenSciBatch) {
    var response = new Response();

    try {
        var httpClient = new HttpClient();

        await httpClient
            .PostAsync(httpClient.BaseAddress, new StringContent(seralizedObject, Encoding.UTF8, "application/json"))
            .ContinueWith((requestTask) => UpdateBatch(requestTask, kenSciBatch));
        } catch (Exception e) {
            // some logic
            return response;
        }

        // some logic
        return response;
    }

在我尝试更新时的回调函数中，我得到一个例外DbContext已被处理掉。

private void UpdateBatch(Task<HttpResponseMessage> requestTask, KenSciBatch kenSciBatch) {
    try {
        if (requestTask.Result.StatusCode == HttpStatusCode.OK) {
            kenSciBatch.Status = BatchStatus.Sent;
            _kensciBatchRepository.Update(kenSciBatch);
        }
    } catch (Exception ex) {
        throw ex;
    }
}

Answer 1

这里：

var sendResponse = SendToKensci(requestObject, batch);

你没有等待SendToKensci（返回Task），所以有时在执行中 - 上下文被处理（因为你已经离开了SendToVendor函数）

依赖注入的存储库模式对象在asyn调用之后被释放

1 个答案: