public class SingletonManager<T> where T : class, new()
{
    /// <summary>
    /// 私有静态实例
    /// </summary>
    private static T instance;

    /// <summary>
    /// 用于同步的对象
    /// </summary>
    private static readonly object mlock = new object();

    /// <summary>
    /// 公共静态属性用于访问实例
    /// </summary>
    public static T Instance
    {
        get
        {
            lock (mlock)//使用锁确保线程安全
            {
                if (instance == null)//如果实例为空，则创建新实例
                {
                    instance = new T();
                }
                return instance;
            }
        }
    }

    /// <summary>
    /// 释放单例
    /// </summary>
    public virtual void ReleaseInstance()
    {
        if (instance != null)
        {
            instance = null; // 释放引用
        }
    }
}