C#6.0中的只读属性 [英] Read-Only Property in C# 6.0

问题描述

Microsoft在C#6中引入了一种新语法，可让您将属性设置为只读，如下所示:

Microsoft introduce a new syntax in C#6 that let you set your property to read-only as below:

public class Animal
{
    public string MostDangerous { get; } = "Mosquito";
}

我想知道这种方法的附加价值是什么.

I am wondering what is the added value of such approach.

仅写有什么区别?

public class Animal
{
    public const string MostDangerous = "Mosquito";
}

甚至:

public class Animal
{
    public string MostDangerous 
    { 
        get
        {
            return "Mosquito";
        }
    }
}

推荐答案

您的示例使用的字符串常量无法显示所有可能性.看一下这段代码:

Your example is using string constants which can't show all the possibilities. Look at this snippet:

class Foo
{
    public DateTime Created { get; } = DateTime.Now;  // construction timestamp

    public int X { get; } 

    public Foo(int n)
    {
        X = n;  // writeable in constructor only
    }
}

只读属性是按实例的，可以从构造函数中进行设置.与 const 字段非常不同，该字段的值必须在编译时确定.属性初始化器是一个单独的功能，它遵循字段初始化器的规则和限制.

Read only properties are per-instance and can be set from the constructor. Very different from a const field whose value must be determined at compile time. The property initializer is a separate feature and follows the rules and limitations of field initializers.

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