如何使用Func <>返回方法的引用？

Question

I have a simple bit of code but am struggling to work out the correct syntax to return the method as a reference so it can be used.

This is what i am trying to do:

    public static Func<float> GetFunction(Functions functions)
    {
        switch (functions)
        {
            case Functions.Linear: return // how do i return the func here?
                break;
            default: return null;
        }
    }

    public static float Linear(float k) // am trying to return this
    {
        return k;
    }

The idea then is i will be able to do something like:

Func<float> func = GetFunction(Functions.Linear);
print func(10);

I am not sure how i create the return though.

Answer 1

For a delegate to float Linear(float k) , a function that takes a float argument and has a float return value, the generic Func<float, float> delegate would have to be used instead of Func<float> , which encapsulates a function that takes no argument and returns a float . As in:

public static Func<float, float> GetFunction(Functions functions)
{
    switch (functions)
    {
        case Functions.Linear: return Linear;
            break;
        default: return null;
    }
}

public static float Linear(float k) // am trying to return this
{
    return k;
}