如何创建通用词典？

发布于 2024-10-22 10:36:43 字数 213 浏览 6 评论 0原文

我有一堂课，其中有一本持有特定键的字典。但值应该是通用的。

比如：

private Dictionary<String,TValue> _Dictionary;

但是 TValue 没有找到（显然），但是我还应该输入什么？我找到了 IList 的解决方案，但我只想添加一个通用对象。

原文

I have a Class where i have a Dictionary holding a specific Key. But the Value should be generic.

Something like:

private Dictionary<String,TValue> _Dictionary;

But TValue is not found (obvesly) but what else should i put in? I found a solution for IList but i just want to add one Generic Object.

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美煞众生 2024-10-29 10:36:43

那么你想要一本通用词典吗？使用预定义的类。

public Dictionary<int, string> _dictionary = new Dictionary<int, string>();

这将为您提供一个带有整数键和字符串值的字典。如果您需要一个只有其中一个变量的 Dictionary，您可以继承 Dictionary 来创建您自己的类型。

public class KeyTypeConstantDictionary<T> : Dictionary<int, T>
{
}

然后使用它就像这样：

KeyTypeConstantDictionary<string> x = new KeyTypeConstantDictonary<string>();
// Equivalent to Dictionary<int, string>()
KeyTypeConstantDictionary<SomeObject> x = new KeyTypeConstantDictonary<SomeObject>();
// Equivalent to Dictionary<int, SomeObject>()

希望我正确理解你的问题。

So you want a generic dictionary? Use the pre defined class.

public Dictionary<int, string> _dictionary = new Dictionary<int, string>();

That gives you a dictionary with an integer key, and a string value. If you need a Dictionary with only one of those being variable, you can inherit Dictionary to make your own type.

public class KeyTypeConstantDictionary<T> : Dictionary<int, T>
{
}

Then using it is like so:

KeyTypeConstantDictionary<string> x = new KeyTypeConstantDictonary<string>();
// Equivalent to Dictionary<int, string>()
KeyTypeConstantDictionary<SomeObject> x = new KeyTypeConstantDictonary<SomeObject>();
// Equivalent to Dictionary<int, SomeObject>()

Hopefully I understood your question correctly.

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无力看清 2024-10-29 10:36:43

如果您在泛型类型中使用它，Tejs 答案是合适的。

但是，如果您只是尝试创建一个具有固定类型键但可以存储任何值的字典，则一种选择是仅使用 System.Object 作为您的值：

 private Dictionary<string, object> _dictionary;

这将允许您将任何对象分配给值。但是，这存在潜在危险，因为您会失去类型安全性，并且需要确保正确拆箱并转换对象。

If you're using this within a generic type, Tejs answer is appropriate.

However, if you're just trying to make a dictionary with a fixed type of key, but which can store any value, one option is to just use System.Object for your value:

 private Dictionary<string, object> _dictionary;

This will allow you to assign any object into the value. However, this is potentially dangerous, as you lose type safety and need to make sure to unbox and convert the object correctly.

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