在初始化C＃时将参数传递给字典中的操作

Question

I have a Dictionary which has KeyCode as a key and an Action<int> as value,h however I want to give the Action parameters at the initialization of the dictionary like this :

    someDictionary = new Dictionary<KeyCode, Action<int>>()
    {
        {KeyCode.Alpha1, GoToCameraPosition(0) },
    };

How can I do that ?

Answer 1

This is called currying . Note that the second type parameter to Dictionary has changed from your original: The action you create has no parameters, because the parameter for the action it calls is built into the anonymous lambda stored in the dictionary.

someDictionary = new Dictionary<KeyCode, Action>()
{
    {KeyCode.Alpha1, () => GoToCameraPosition(0) },
};

Call like so:

KeyCode key = KeyCode.Alpha1;
Action act = null;

if (someDictionary.TryGetValue(key, out act))
{
    //  act is a method that calls GoToCameraPosition(0)
    act();
}

Or

foreach (var kvp in someDictionary)
{
    kvp.Value();
}

Or, if you're certain it's in there...

someDictionary[KeyCode.Alpha1]();