c#简单的实现单例模式，或单体模式

 

s

    abstract public class DefaultSingletonNode<TNode> where TNode : DefaultSingletonNode<TNode>, new() {
        private static object lockHelper = new object();
        public static TNode GetInstance() {
            TNode _instance = null;
            if (_instance == null) {
                lock (lockHelper) {
                    if (_instance == null) {
                        _instance = new TNode();
                    }
                }
            }
            return _instance;
        }
    }

　　

    abstract public class SingleBLL<T> : DefaultNode<T>
        where T : DefaultNode<T>, new(){
    }

　　

    public class logBLL : SingleBLL<logBLL> {
        public void Write(string s){}
    }

　　

调用

logBLL.GetInstance().Write("sdfsfdsf");

 

 

优点，对于类型的实例化具有一定的可控性，不需要一直去new，