C# Task详解与TPL任务用法

Task task = Task.Run(() =>
{
    Console.WriteLine("任务正在执行...");
    Thread.Sleep(1000);
});
await task;
Console.WriteLine("任务完成");

Task task = Task.Factory.StartNew(() =>
{
    // 执行耗时操作
});

Task task = Task.Run(() =>
{
    return 42;
});
int result = await task;
Console.WriteLine($"结果是: {result}");

public async Task GetDataAsync()
{
    Console.WriteLine("开始获取数据...");
    string data = await FetchDataAsync();
    Console.WriteLine($"获取到数据: {data}");
}
private async Task FetchDataAsync()
{
await Task.Delay(1000); // 模拟网络请求
return "示例数据";
}

Task task1 = Task.Run(() => DoWork("A"));
Task task2 = Task.Run(() => DoWork("B"));
Task task3 = Task.Run(() => DoWork("C"));
await Task.WhenAll(task1, task2, task3);
Console.WriteLine("所有任务完成");

Task[] tasks = {
    Task.Run(() => LongOperation("快")),
    Task.Run(() => LongOperation("慢"))
};
Task first = await Task.WhenAny(tasks);
Console.WriteLine("至少有一个任务完成");

Task.Run(() => Console.WriteLine("第一步"))
     .ContinueWith(t => Console.WriteLine("第二步"))
     .ContinueWith(t => Console.WriteLine("第三步"));

CancellationTokenSource cts = new CancellationTokenSource();
CancellationToken token = cts.Token;
Task task = Task.Run(() =>
{
for (int i = 0; i < 10; i++)
{
token.ThrowIfCancellationRequested();
Console.WriteLine($"工作进度: {i}");
Thread.Sleep(200);
}
}, token);
// 模拟取消
cts.CancelAfter(1000);
try
{
await task;
}
catch (OperationCanceledException)
{
Console.WriteLine("任务已被取消");
}