经过测试，还是重复

[yuxueliang]

var blockingCollection = new BlockingCollection();
List tasks = new List();
for (int i = 0; i < 100; i++)
{
var task = Task.Run(() =>
{

                for (int j = 0; j < 10000; j++)
                {

                    blockingCollection.Add(new Generator(1, DateTime.MinValue).Next());
                }
            });

            tasks.Add(task);
        }

        Task.WaitAll(tasks.ToArray());

        Console.WriteLine(blockingCollection.Distinct().Count());

        Console.ReadKey();

[hanslai]

I guess, I will translate the issue title. What @yuxueliang said was: “After some test, it will still generated duplicated Ids.”

[jhabjan]

There is nothing wrong with this library and it works as expected without creating duplicates. Issue here is your poor implementation. Why would you create new instance of Generator for every iteration? With example you provided result is as expected.

[mschuler]

As @jhabjan said, you must not create new instances of Generator with the same Instance ID (in your case 1). If you create multiple generators, use unique instance id's.