c# - 无法在第二轮将项目添加到集合中

Question

基本上我的 Windows 服务应用程序中有一个 blockingcollection，每次我想向集合中添加 4 个项目然后处理它。

第一轮还好，第二轮就失败了。错误是

The BlockingCollection has been marked as complete with regards to additions.

我的代码:

    public static BlockingCollection<Tuple<ChannelResource, string>> bc = new BlockingCollection<Tuple<ChannelResource, string>>();
    public static List<string> list = new List<string>(); // then add 100 items to it.

主要应用代码:

            ProcessCall pc = new ProcessCall(OvrTelephonyServer, bc);
            while (true)
            {
                ThreadEvent.WaitOne(waitingTime, false);

                lock (SyncVar)
                {
                    Console.WriteLine("Block begin");
                    for (int i = 0; i < 4; i++)
                    {
                        var firstItem = list.FirstOrDefault();
                        ChannelResource cr = OvrTelephonyServer.GetChannel();
                        bc.TryAdd(Tuple.Create(cr, firstItem));
                        list.Remove(firstItem);
                    }
                    bc.CompleteAdding();
                    pc.SimultaneousCall();
                    Console.WriteLine("Blocking end");
                    if (ThreadState != State.Running) break;
                }
            }

我意识到有一个代码 bc.CompleteAdding(); 可以阻止进一步的添加。所以我把它注释掉了，但它不会进入第二轮 block 。它没有到达代码 Console.WriteLine("Blocking end"); 和我的一样 old thread.

Answer 1

根据 TaW 的提示，我在每次迭代中都重新创建了集合。

每次迭代都有自己的CompleteAdding()。

                lock (SyncVar)
                {
                    bc = new BlockingCollection<Tuple<ChannelResource, string>>();
                    ProcessCall pc = new ProcessCall(OvrTelephonyServer, bc);
                    if (list.Count > 0)
                    {
                        Console.WriteLine("Block begin");
                        for (int i = 0; i < 4; i++)
                        {
                            if (list.Count > 0)
                            {
                                var firstItem = list.FirstOrDefault();
                                ChannelResource cr = OvrTelephonyServer.GetChannel();
                                bc.TryAdd(Tuple.Create(cr, firstItem));
                                list.Remove(firstItem);
                            }
                        }
                        bc.CompleteAdding();
                        pc.SimultaneousCall();
                        Console.WriteLine("Blocking end");
                    }
                    if (ThreadState != State.Running) break;
                }