Question

Is it possible to have a C# lambda/delegate that can take a variable number of parameters that can be invoked with a Dynamic-invoke?

All my attempts to use the ‘params’ keyword in this context have failed.

---

UPDATE WITH WORKING CODE FROM ANSWER:

delegate void Foo(params string[] strings);

static void Main(string[] args)                       
{
    Foo x = strings =>
    {
        foreach(string s in strings)
            Console.WriteLine(s);
    };

    //Added to make it clear how this eventually is used :)
    Delegate d = x;

    d.DynamicInvoke(new[]{new string[]{"1", "2", "3"}});
}

Answer 1

The reason that it doesn’t work when passing the arguments directly to DynamicInvoke() is because DynamicInvoke() expects an array of objects, one element for each parameter of the target method, and the compiler will interpret a single array as the params array to DynamicInvoke() instead of a single argument to the target method (unless you cast it as a single object).

You can also call DynamicInvoke() by passing an array that contains the target method’s parameters array. The outer array will be accepted as the argument for DynamicInvoke()‘s single params parameter and the inner array will be accepted as the params array for the target method.

delegate void ParamsDelegate(params object[] args);

static void Main()
{  
   ParamsDelegate paramsDelegate = x => Console.WriteLine(x.Length);

   paramsDelegate(1,2,3); //output: "3"
   paramsDelegate();      //output: "0"

   paramsDelegate.DynamicInvoke((object) new object[]{1,2,3}); //output: "3"
   paramsDelegate.DynamicInvoke((object) new object[]{}); //output: "0"

   paramsDelegate.DynamicInvoke(new []{new object[]{1,2,3}}); //output: "3"
   paramsDelegate.DynamicInvoke(new []{new object[]{}});      //output: "0"
}