基于任务的异步编程模型 (TAP) 实现做早餐示例代码

using System;
using System.Threading.Tasks;

namespace AsyncBreakfast
{
class Program
{
static void Main(string[] args)
{
Coffee cup = PourCoffee();
Console.WriteLine("coffee is ready");

Egg eggs = FryEggs(2);
Console.WriteLine("eggs are ready");

Bacon bacon = FryBacon(3);
Console.WriteLine("bacon is ready");

Toast toast = ToastBread(2);
ApplyButter(toast);
ApplyJam(toast);
Console.WriteLine("toast is ready");

Juice oj = PourOJ();
Console.WriteLine("oj is ready");
Console.WriteLine("Breakfast is ready!");
}

private static Juice PourOJ()
{
Console.WriteLine("Pouring orange juice");
return new Juice();
}

private static void ApplyJam(Toast toast) =>
Console.WriteLine("Putting jam on the toast");

private static void ApplyButter(Toast toast) =>
Console.WriteLine("Putting butter on the toast");

private static Toast ToastBread(int slices)
{
for (int slice = 0; slice < slices; slice++)
{
Console.WriteLine("Putting a slice of bread in the toaster");
}
Console.WriteLine("Start toasting...");
Task.Delay(3000).Wait();
Console.WriteLine("Remove toast from toaster");

return new Toast();
}

private static Bacon FryBacon(int slices)
{
Console.WriteLine($"putting {slices} slices of bacon in the pan");
Console.WriteLine("cooking first side of bacon...");
Task.Delay(3000).Wait();
for (int slice = 0; slice < slices; slice++)
{
Console.WriteLine("flipping a slice of bacon");
}
Console.WriteLine("cooking the second side of bacon...");
Task.Delay(3000).Wait();
Console.WriteLine("Put bacon on plate");

return new Bacon();
}

private static Egg FryEggs(int howMany)
{
Console.WriteLine("Warming the egg pan...");
Task.Delay(3000).Wait();
Console.WriteLine($"cracking {howMany} eggs");
Console.WriteLine("cooking the eggs ...");
Task.Delay(3000).Wait();
Console.WriteLine("Put eggs on plate");

return new Egg();
}

private static Coffee PourCoffee()
{
Console.WriteLine("Pouring coffee");
return new Coffee();
}
}
}

来源：https://docs.microsoft.com/zh-cn/dotnet/csharp/programming-guide/concepts/async/