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;  }  }  
}