是否可以将功能存储在字典中? [英] Is it possible to store functions in a dictionary?

问题描述

我有一条消息进入我的C#应用​​程序，这是一个序列化为JSON的对象，当我反序列化它时，我有一个名称" string 和一个有效负载" string [] ，我希望能够使用名称"并使用有效载荷"数组作为其参数在函数字典中查找它，然后将输出返回给发送消息的客户端，这在C#中可能吗?

I have a message coming into my C# app which is an object serialized as JSON, when i de-serialize it I have a "Name" string and a "Payload" string[], I want to be able to take the "Name" and look it up in a function dictionary, using the "Payload" array as its parameters and then take the output to return to the client sending the message, is this possible in C#?

我在此处找到了堆栈溢出的答案，其中第二部分似乎是合理的，但我不知道我在说什么'm用 State

I've found a stack overflow answer here where the second part seems plausible but i don't know what I'm referencing with State

推荐答案

听起来您可能想要这样的东西:

It sounds like you probably want something like:

Dictionary<string, Func<string[], int>> functions = ...;

这是假设函数返回一个 int (您尚未指定).因此，您可以这样称呼它:

This is assuming the function returns an int (you haven't specified). So you'd call it like this:

int result = functions[name](parameters);

或验证名称:

Func<string[], int> function;
if (functions.TryGetValue(name, out function))
{
    int result = function(parameters);
    ...
}
else
{
    // No function with that name
}

尚不清楚您要从何处填充 functions 的位置，但是如果它是同一类中的方法，则可能会有类似的内容:

It's not clear where you're trying to populate functions from, but if it's methods in the same class, you could have something like:

Dictionary<string, Func<string[], int>> functions = 
    new Dictionary<string, Func<string[], int>>
{
    { "Foo", CountParameters },
    { "Bar", SomeOtherMethodName }
};

...

private static int CountParameters(string[] parameters)
{
    return parameters.Length;
}

// etc

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