C# 多线程处理List数据的示例代码

/// <summary>
/// 多线程处理数据（无返回值）
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <param name="list">待处理数据</param>
/// <param name="action">数据处理方法（有参数无返回值）</param>
/// <param name="count">处理线程数量</param>
/// <param name="waitFlag">是否等待执行结束</param>
static void RunTask<T>(List<T> list, Action<T> action, int threadCount = 5, bool waitFlag = true)
{
  ConcurrentQueue<T> queue = new ConcurrentQueue<T>(list);
  Task[] tasks = new Task[threadCount];
  for (int i = 0; i < threadCount; i++)
  {
    tasks[i] = Task.Run(() =>
     {
       while (queue.TryDequeue(out T t))
       {
         action(t);
       }
     });
  }
  if (waitFlag)
  {
    Task.WaitAll(tasks);
  }
}

/// <summary>
/// 多线程处理数据（返回处理后列表）
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <param name="list">待处理数据</param>
/// <param name="func">数据处理方法（有参数有返回值）</param>
/// <param name="threadCount">处理线程数量</param>
/// <returns>数据处理后结果</returns>
static List<T> RunTask<T>(List<T> list, Func<T, T> func, int threadCount = 5)
{
  var result = new List<T>();
  ConcurrentQueue<T> queue = new ConcurrentQueue<T>(list);
  Task<List<T>>[] tasks = new Task<List<T>>[threadCount];
  for (int i = 0; i < threadCount; i++)
  {
    tasks[i] = Task.Run<List<T>>(() =>
    {
      var rList = new List<T>();
      while (queue.TryDequeue(out T t))
      {
        rList.Add(func(t));
      }
      return rList;
    });
  }
  Task.WaitAll(tasks);
  for (int i = 0; i < threadCount; i++)
  {
    result.AddRange(tasks[i].Result);
  }
  return result;
}

List<int> list = new List<int>() { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
//输出列表中的数据，且加上“action”字符前缀
RunTask<int>(list, d => { Console.WriteLine("action" + d); });

//对列表中数据都执行 “*2” 的操作
var result = RunTask<int>(list, d => { return d * 2; });
result.ForEach(d => Console.WriteLine(d));