我正在看一些同事写的代码和我预期会发生的代码.这是代码：
- public class SingletonClass
- {
- private static readonly SingletonClass _instance = new SingletonClass();
- public static SingletonClass Instance
- {
- get { return _instance; }
- }
- private SingletonClass()
- {
- //non static properties are set here
- this.connectionString = "bla"
- this.created = System.DateTime.Now;
- }
- }
在另一堂课中,我希望能够做到：
- private SingletonClass sc = SingletonClass.Instance.Instance.Instance.Instance.Instance.Instance;
它引用该类的相同实例.发生的事情是我只能有一个.实例.我没想到的东西.如果Instance属性返回一个SingletonClass类,为什么我不能在返回的类上调用Instance属性,依此类推？
解决方法
If the Instance property returns a SingletonClass class,why can’t I call the Instance property on that returned class and so on and so on?
因为您只能通过SingletonClass类型访问.Instance,而不能通过该类型的实例访问.Instance.
由于Instance是静态的,您必须通过以下类型访问它：
- SingletonInstance inst = SingletonInstance.Instance; // Access via type
- // This fails,because you're accessing it via an instance
- // inst.Instance
当你试图链接这些时,你实际上是这样做的：
- SingletonInstance temp = SingletonInstance.Instance; // Access via type
- // ***** BAD CODE BELOW ****
- // This fails at compile time,since you're trying to access via an instance
- SingletonInstance temp2 = temp.Instance;
