单例模式

public class SingletonObject
{
    public string name { get; set; }
    public SingletonObject() { 
        name=Guid.NewGuid().ToString();
    }
    public static readonly object lock_obj=new object();
    public static SingletonObject singletonObject;
    public static SingletonObject CreateSingletion()
    {
        if (singletonObject == null)
        {
            lock (lock_obj)
            {
                if (singletonObject == null)
                    singletonObject = new SingletonObject();
            }
        }
        return singletonObject;
    }
}

调用

    var singleton = SingletonObject.CreateSingletion();
    var singleton2 = SingletonObject.CreateSingletion();
    Console.WriteLine(singleton.name); 
    Console.WriteLine(singleton2.name);