数据分组使用线程处理

               //每一个task执行最多6条
                var remainder = length % 6;
                int i = 0;
                List<Task> tasks = new List<Task>();
                int max;
                StringBuilder sb = new StringBuilder();
                while ((max = i + 6) <= length || (max = i + remainder) <= length)
                {
                    if (i >= length)
                    {
                        break;
                    }
                    tasks.Add(Task.Run(() =>
                    {
                        HandleData(i, max, sb);
                    }));
                    i = max;
                }
                Task.WaitAll(tasks.ToArray());