.Net 中的多任务

Question

如代码注释询问。我不知道为什么等待“continuation.Result”的主线程在打印出它的值之前有值。

static void Main(string[] args)
{
    Task<string> antecedent = Task.Delay(5000).ContinueWith<string>(x => 
    {
        Console.WriteLine("return in task1 {0}", Thread.CurrentThread.ManagedThreadId);

        return DateTime.Today.ToShortDateString();
    });
    
    Task<string> continuation = antecedent.ContinueWith(x => 
    {
        x.Wait(1000);
        Console.WriteLine("return in task2 {0}{1}",Thread.CurrentThread.ManagedThreadId,x.Status);
        return "Today is " + antecedent.Result;
    });

    Console.WriteLine("this will print before the result");

    Console.WriteLine(continuation.Result); //why this waiting ?

    Console.ReadKey();
}

Answer 1

I don't know why the main thread waiting for "continuation.Result" had value before print out its value.

您还希望它做什么？它无法在之前打印一个值它有它。

Task.Result 内部等待任务：

Accessing the property's get accessor blocks the calling thread until the asynchronous operation is complete

.Net 中的多任务

MultiTask in .Net

.net

c#

multithreading

multitasking