如何初始化ReadOnlyDictionary? [英] How to initialise ReadOnlyDictionary?

问题描述

我有一本不变的字典，该字典在全班公开.

I have an unchanging dictionary that is exposed in a class.

当前我的代码如下

using System.Collections.Generic;
using System.Collections.ObjectModel;

public class FooClass
{
    private static ReadOnlyDictionary<string, byte> _validRevisions 
        = new ReadOnlyDictionary<string, byte>(
            new Dictionary<string, byte>() { 
                { "1.0", 0x00 },
                { "1.1", 0x01 },
                { "1.2", 0x02 },
                { "1.3", 0x03 }
            } );

    public static ReadOnlyDictionary<string, byte> ValidRevisions => _validRevisions;

    // other FooClass contents...
}

我使用了后备字段_validRevisions，因为我无法找到创建共享常量字典属性的更好方法.有没有更整洁的方法来解决这个问题，或者也许我应该公开此领域?

I've used the backing field _validRevisions as I could not figure out a better way of creating a shared constant dictionary property. Is there neater way to manage this or maybe I should just make the field public?

我的主要问题是，有没有更短的方法来初始化_validRevisions字段本身?创建一个内联的Dictionary并将其传递给Dictionary(碰巧是只读的)似乎有点……代码的味道.是吗?有更好的方法吗?

My main question being is there a shorter way to initialise the _validRevisions field itself? Creating a Dictionary inline to pass it into a Dictionary (that happens to be read only) seems a bit... of a code smell. Is it? Is there a better way?

我刚刚注意到的关于ROD的另一件事，没有任何方法可以支持检查它是否包含给定的值...是否有与之相关的原因?

one more thing about the ROD I just noticed, there are no methods to support checking if it contains a given value... is there a reason for that related to it' read-only-ness?

推荐答案

如果您不介意使用IReadOnlyDictionary而不是ReadOnlyDictionary，则可以使用它，因为Dictionary实现了IReadOnlyDictionary:

If you don't mind having an IReadOnlyDictionary instead of a ReadOnlyDictionary, you could use this, since Dictionary implements IReadOnlyDictionary:

private static IReadOnlyDictionary<string, byte> _validRevisions
    = new Dictionary<string, byte>
       {
           { "1.0", 0x00 },
           { "1.1", 0x01 },
           { "1.2", 0x02 },
           { "1.3", 0x03 }
        };

public static IReadOnlyDictionary<string, byte> ValidRevisions => _validRevisions;

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