在C＃中的Parallel.Foreach循环中将Tuple添加为线程安全输入

Question

我需要C＃中Parallel.Foreach循环的帮助。我有一种感觉，有时＆＃34;结果＆＃34;元组由其他并行线程重写，因此没有正确的输出。它并不经常发生，但有时会吐出不好的结果。

场景：网络设备是可访问的，一切正常，输出存储在＆＃34;结果＆＃34;元组。但是当我使用＆＃34;结果＆＃34;此外，即使输出存储在那里，元组有时也是空的。可能是并行处理中的其他线程正在擦除＆＃34;结果＆＃34; ？我可以让它更安全吗？

Tuple <string, int> result;

/*loop through all hosts and execute commands -> In paralel*/
        Parallel.ForEach(devices, (hostname, state) =>
        {
            //because we have multithreading every thread must differentiate -> based on hostname (first value in list) - key is also hostname
            device_checked_with_all_parameters.Add(cleaned_hostname, new List<string> { DateTime.Now.ToString("d.M.yyyy HH:mm:ss"), cleaned_hostname, "", "", "", "" });

                //if stop is pushed break all threads
            if (token.IsCancellationRequested)
            {
                canceled_loop = 1;
                state.Break();
            }

            //PERFORM ACTION ON DEVICE - STORE OUTPUT IN RESULT
            result = core.connect_to_device_and_perform_actions(device_checked_with_all_parameters[cleaned_hostname][1], config_vlan_ids_based_on_type);

         });