c++ - 在 CLI/C++ 中限制 API 调用的运行时间

Question

我想限制在 C++/CLI 引用类中等待 API 调用响应的时间。

我看过 following code在 C# 中看起来像我想要的:

var task = Task.Run(() =>
{
    return LongRunningMethod();
});

bool isCompletedSuccessfully = task.Wait(TimeSpan.FromMilliseconds(3000));

if (isCompletedSuccessfully)
{
    return task.Result;
}
else
{
    throw new TimeoutException("The function has taken longer than the maximum time allowed.");
}

如何将这段代码“翻译”成 CLI/C++？看起来 Task.Run 不能立即运行。

为了记录，我的“LongRunningMethod”是这样的:

            bool my_client::CanContactServer()
            {
                bool isAvailable = static_cast<bool>(m_p_client->contactServer());

                return isAvailable;
            }

Answer 1

C++/CLI 不支持 lambda，但您仍然可以将委托(delegate)传递给 Task.Run 方法。您的代码将如下所示:

// I suppose you have an instance of my_client initialized somewhere
my_client^ client = gcnew my_client(); 

Func<bool>^ f = gcnew Func<bool>(client, &my_client::CanContactServer);
Task<bool>^ task = Task::Run(f);

bool isCompletedSuccessfully = task->Wait(TimeSpan::FromMilliseconds(3000));

if (isCompletedSuccessfully)
{
    return task->Result;
}
else
{
    throw gcnew TimeoutException("The function has taken longer than the maximum time allowed.");
}