静态属性或静态就绪字段 [英] Static propery or static readony field

问题描述

我有一些常量"的初始化属性/字段，我想知道以下哪一行最适合使用:

I have some intialized Property/Fields that are "constant" and I want to know which one of the following line is the best to use :

1. public static Color MyColor { get { return Color.Red;} }
2. public static readonly Color MyOtherColor = Color.Red;

(惰性)初始化后是否存在一些运行时差异?性能用途是否不同?

Is there some runtime differences after (lazy)initialization ? Are the performance usages differents ?

推荐答案

字段使用指南 建议对预定义的对象实例使用公共静态只读字段.例如:

The Field usage guidelines recommend using public static read-only fields for predefined object instances. For example:

public struct Color
{
    // this is a predefined immutable instance of the containing Type
    public static readonly Color Red = new Color(0x0000FF);

    ...
}

在你的情况下，我可能会使用一个属性:

In your case, I'd probably use a property:

public class MyClass
{
    // Not a predefined instance of the containing Type => property
    // It's constant today, but who knows, tomorrow its value may come from a 
    // configuration file.
    public static Color MyColor { get { return Color.Red; } }
}

更新

当我看到你的答案时，它非常清楚，但是在 System.Drawing 中使用 ILSpy 向我展示了以下代码: public static Color Red { get { return new Color(KnownColor.Red);} }

It's crystal clear when I see your answer, but using ILSpy in System.Drawing shows me the following code: public static Color Red { get { return new Color(KnownColor.Red); } }

上面链接的指南(以颜色为例)适用于 .NET 1.1，并且可能已经演变.我个人认为使用属性不会出错..NET 4.0 Field Guidelines 类似，但使用 DateTime.MaxValue 和 DateTime.MinValue 作为预定义对象实例的示例.

The guidelines linked above (which use Color as an example) are for .NET 1.1 and have possibly evolved. Personally I don't think you can go wrong by using a property. .NET 4.0 Field Guidelines are similar, but use DateTime.MaxValue and DateTime.MinValue as examples of predefined object instances.

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