C#端一个不错的订单号生成规则

/// <summary>
/// 订单助手
/// </summary>
public class OrderHelper
{
    /// <summary>
    ///  防止创建类的实例
    /// </summary>
    private OrderHelper() { }

    private static readonly object Locker = new object();
    private static int _sn = 0;

    /// <summary>
    /// 生成订单编号
    /// </summary>
    /// <returns></returns>
    public static string GenerateId()
    {
        lock (Locker)   //lock 关键字可确保当一个线程位于代码的临界区时，另一个线程不会进入该临界区。
        {
            if (_sn == int.MaxValue)
            {
                _sn = 0;
            }
            else
            {
                _sn++;
            }

            Thread.Sleep(100);

            return DateTime.Now.ToString("yyyyMMddHHmmss") + _sn.ToString().PadLeft(10, '0');
        }
    }
}