C#多线程的4中方式

Thread

class Program  
{  
    static void Main()  
    {  
        Thread thread = new Thread(new ThreadStart(DoWork));  
        thread.Start();  
        thread.Join(); // 等待线程完成  
  
        Console.WriteLine("主线程结束。");  
    }  
  
    static void DoWork()  
    {  
        Console.WriteLine("线程开始工作。");  
        Thread.Sleep(1000); // 模拟工作  
        Console.WriteLine("线程工作完成。");  
    }  
}

ThreadPool

class Program  
{  
    static void Main()  
    {  
        ThreadPool.QueueUserWorkItem(DoWork);  
        ThreadPool.QueueUserWorkItem(state => DoWorkWithState((string)state), "参数");  
  
        // 防止主线程提前结束  
        Thread.Sleep(2000);  
    }  
  
    static void DoWork(object state)  
    {  
        Console.WriteLine("ThreadPool 工作项开始工作。");  
        Thread.Sleep(1000); // 模拟工作  
        Console.WriteLine("ThreadPool 工作项完成。");  
    }  
  
    static void DoWorkWithState(string state)  
    {  
        Console.WriteLine($"ThreadPool 带参数的工作项开始工作，参数：{state}");  
        Thread.Sleep(1000); // 模拟工作  
        Console.WriteLine($"ThreadPool 带参数的工作项完成。");  
    }  
}

Task

class Program  
{  
    static async Task Main()  
    {  
        Task task = Task.Run(() => DoWork());  
        await task; // 等待任务完成  
  
        Console.WriteLine("主线程结束。");  
    }  
  
    static void DoWork()  
    {  
        Console.WriteLine("Task 开始工作。");  
        Task.Delay(1000).Wait(); // 模拟异步工作  
        Console.WriteLine("Task 工作完成。");  
    }  
}

async/await

class Program  
{  
    static async Task Main()  
    {  
        string url = "https://www.example.com";  
        string content = await FetchContentAsync(url);  
        Console.WriteLine(content);  
    }  
  
    static async Task<string> FetchContentAsync(string url)  
    {  
        using (HttpClient client = new HttpClient())  
        {  
            HttpResponseMessage response = await client.GetAsync(url);  
            response.EnsureSuccessStatusCode();  
            string responseBody = await response.Content.ReadAsStringAsync();  
            return responseBody;  
        }  
    }  
}