异步任务的结果被阻止 [英] Result of a async task is blocking

问题描述

当我尝试检索结果时，我遇到了任务阻塞的问题.

I have an issue with a task blocking when I try to retrieve it's result.

我有以下要同步执行的代码(这就是为什么我要寻找结果的原因)

I have the following piece of code I want executed synchronously (which is why I'm looking for the result)

我会忽略每次拨打电话的原因(传统软件需要通过不同的层进行多次通话)

I would ignore the reason each call has to be made (legacy software that requires multiple calls through different layers)

在启动要在PostCreateProfile中进行最终调用的任务之后，该调用似乎中断了，我可以看到此请求再也没有做到这一点了.

the call seems to break down after it starts the task for the final call to be made in the PostCreateProfile, I can see this request never makes it any further than this.

if (CreateProfile(demographics).Result) // Task blocks here
{
    //dothing
}

private async Task<bool> CreateProfile(Demographics demographics)
{
    ProfileService profileService = new ProfileService();

    CreateProfileBindingModel createProfileBindingModel = this.CreateProfileModel(demographics);

    return await profileService.Create(createProfileBindingModel);
}

public async Task<bool> Create(CreateProfileBindingModel model)
{
    HttpResponseMessage response = await profileServiceRequest.PostCreateProfile(rootURL, model);

    return response.IsSuccessStatusCode;
}

public Task<HttpResponseMessage> PostCreateProfile(string url, CreateProfileBindingModel model)
{
    HttpContent contents = SerialiseModelData(model);
    var resultTask = client.PostAsync(url, contents);

    return resultTask;
}

如果我将CreateProfile更改为异步void，则请求将到达其目的地，如下所示:

The request will reach its destination if I was to change CreateProfile to an async void like so:

private async void CreateProfile(AppointmentController controller)
{
    ProfileService profileService = new ProfileService();

    CreateProfileBindingModel createProfileBindingModel = this.CreateProfileModel(controller);

    await profileService.Create(createProfileBindingModel);
}

但是我不能从中退回我想使用的布尔值. 谁能指出我做错了什么?

But I can't return the bool I want to use from this. Can anyone point out what I am doing wrong?

推荐答案

永远不要在异步/等待链上调用.Result .

任何调用CreateProfile(demographics)的代码都必须也是异步的，这样它才能做到

Whatever code that calls CreateProfile(demographics) needs to be async too so it can do

if (await CreateProfile(demographics))
{
    //dothing
}

此外，如果可以的话，您真的应该将.ConfigureAwait(false)放在逻辑上可能的地方.

Also, if you can you really should put .ConfigureAwait(false) wherever it is logically possible.

if (await CreateProfile(demographics).ConfigureAwait(false)) // depending on what dothing is you may not want it here.
{
    //dothing
}

private async Task<bool> CreateProfile(Demographics demographics)
{
    ProfileService profileService = new ProfileService();

    CreateProfileBindingModel createProfileBindingModel = this.CreateProfileModel(demographics);

    return await profileService.Create(createProfileBindingModel).ConfigureAwait(false);
}

public async Task<bool> Create(CreateProfileBindingModel model)
{
    HttpResponseMessage response = await profileServiceRequest.PostCreateProfile(rootURL, model).ConfigureAwait(false);

    return response.IsSuccessStatusCode;
}

public Task<HttpResponseMessage> PostCreateProfile(string url, CreateProfileBindingModel model)
{
    HttpContent contents = SerialiseModelData(model);
    var resultTask = client.PostAsync(url, contents);

    return resultTask;
}

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