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;
