Func<> with unknown number of parameters

Question

Consider the following pseudo code:

TResult Foo(Func f, params object[] args)
{
    TResult result = f(args);
           


        

Answer 1

You can use Delegate with DynamicInvoke.

With that, you don't need to handle with object[] in f.

TResult Foo(Delegate f, params object[] args)
{
    var result = f.DynamicInvoke(args);
    return (TResult)Convert.ChangeType(result, typeof(TResult));
}

Usage:

Func f = (name, age, active) =>
{
    if (name == "Jon" && age == 40 && active)
    {
        return true;
    }
    return false;
}; 

Foo(f,"Jon", 40, true);

I created a fiddle showing some examples: https://dotnetfiddle.net/LdmOqo

---

Note:

If you want to use a method group, you need to use an explict casting to Func:

public static bool Method(string name, int age)
{
    ...
}
var method = (Func)Method;
Foo(method, "Jon", 40);

Fiddle: https://dotnetfiddle.net/3ZPLsY