有关类和方法的C#常规 [英] C# general on classes and methods

问题描述

System.DateTime currentTime = System.DateTime.Now;

上面的这一行调用System类的now方法.
1.但是，为什么不使用new?
2. Now之后的括号为什么不存在?

我的想法应该是
System.DateTime currentTime = new System.DateTime.Now();

System.DateTime currentTime = System.DateTime.Now;

This line above invokes the now method of the System class.
1. However, new is not used why?
2. the bracket after Now does not exist why?

The way I think, it should be
System.DateTime currentTime = new System.DateTime.Now();

推荐答案

1. However, new is not used why?

因为Now是datetime类的静态成员.

Because Now is a static member of the datetime class.

2. the bracket after Now does not exist why?

现在是属性而不是方法.括号不能与属性一起使用.

一些参考:
-静态(C#参考) [属性(C#编程指南) [

Now is a property not a method. Parenthesis are not used with properties.

Some references:
- static (C# Reference)[^]
- Properties (C# Programming Guide)[^]

现在是静态属性(因此没有())会为您提供当前时间.

new DateTime()不可能，因为构造函数不是公共的.

正如OP指出的那样，DateTime确实确实有一个公共构造函数，并且还有更多，所以不知道我在想什么.不好意思

Now is a static property(thus no ()) which gives you the current time.

new DateTime() is not possible because the constructor is not public.

As OP pointed out DateTime does indeed have a public constructor + alot more, don''t know what I were thinking o_O sorry

您没有阅读语言手册-为什么?

—SA

You don''t read language manual — why?

—SA

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