JsonRpc/JsonRPC/RPC/AbsSingle.cs

public abstract class AbsSingle<T> where T : class, new()
{
    static public T Instance
    {
        get
        {
            return SingleHolder.instance;
        }
    }

    private static class SingleHolder
    {
        public static T instance;
        static SingleHolder()
        {
            instance = new T();
        }
    }
}