C#参数中的键值对 [英] Key value pairs in C# Params

问题描述

我正在寻找一种具有以下功能的方法:

I'm looking for a way to have a function such as:

myFunction({"Key", value}, {"Key2", value});

我敢肯定有些匿名类型的东西很简单，但我看不到.

I'm sure there's something with anonymous types that would be pretty easy, but I'm not seeing it.

我唯一想到的解决方案是有一个params KeyValuePair<String, object>[] pairs参数，但最终类似于:

The only solution I can think of is to have a params KeyValuePair<String, object>[] pairs parameter, but that ends up being something similar to:

myFunction(new KeyValuePair<String, object>("Key", value),
           new KeyValuePair<String, object>("Key2", value));

诚然，这要丑陋得多.

为澄清起见，我正在编写一个Message类以在2个不同的系统之间传递.它包含指定消息类型的ushort，以及与消息关联的数据"对象的字符串字典.我希望能够在构造函数中传递所有这些信息，所以我可以做到这一点:

To clarify, I'm writing a Message class to pass between 2 different systems. It contains a ushort specifying the the Message Type, and a dictionary of string to object for "Data" associated with the message. I'd like to be able to pass all this information in the constructor, so I am able to do this:

Agent.SendMessage(new Message(MessageTypes.SomethingHappened, "A", x, "B", y, "C", z));

或类似语法.

推荐答案

如果语法对其他不错的模式不利，请更改语法.怎么样:

When the syntax is bad for an otherwise decent pattern, change the syntax. How about:

public void MyFunction(params KeyValuePair<string, object>[] pairs)
{
    // ...
}

public static class Pairing
{
    public static KeyValuePair<string, object> Of(string key, object value)
    {
        return new KeyValuePair<string, object>(key, value);
    }
}

用法:

MyFunction(Pairing.Of("Key1", 5), Pairing.Of("Key2", someObject));

更有趣的是向string添加扩展方法以使其可配对:

Even more interesting would be to add an extension method to string to make it pairable:

public static KeyValuePair<string, object> PairedWith(this string key, object value)
{
    return new KeyValuePair<string, object>(key, value);
}

用法:

MyFunction("Key1".PairedWith(5), "Key2".PairedWith(someObject));

编辑:您还可以通过引用Dictionary<,>来使用不带通用括号的字典语法:

Edit: You can also use the dictionary syntax without the generic brackets by deriving from Dictionary<,>:

public void MyFunction(MessageArgs args)
{
    // ...
}

public class MessageArgs : Dictionary<string, object>
{}

用法:

MyFunction(new MessageArgs { { "Key1", 5 }, { "Key2", someObject } });

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