How to call some method via Reflection without any parameters and any return values?

Question

How to call some method via Reflection without any parameters and any return values?

Here is MSDN sample

// Define a class with a generic method.
public class Example
{
    public static void Generic<T>()
    {
        Console.WriteLine("\r\nHere it is: {0}", "DONE");
    }
}

What should be within typeof(???) then?

MethodInfo miConstructed = mi.MakeGenericMethod(typeof(???));

Thank you!!!

Answer 1

Before being able to invoke a generic method you need to specify its generic argument(s). So you pass the type you want to be used as generic argument:

public class Example
{
    public static void Generic<T>()
    {
        Console.WriteLine("The type of T is: {0}", typeof(T));
    }
}

class Program
{
    static void Main()
    {
        var mi = typeof(Example).GetMethod("Generic");
        MethodInfo miConstructed = mi.MakeGenericMethod(typeof(string));
        miConstructed.Invoke(null, null);
    }
}

which should print:

The type of T is: System.String

Answer 2

If you were invoking that through C#, you would need to supply a type, for example:

Example.Generic<int>();

that requirement does not change; simply, that line would become:

mi.MakeGenericMethod(typeof(int)).Invoke(null, null);

For a complete, working illustration:

class Example
{
    public static void Generic<T>()
    {
        System.Console.WriteLine("\r\nHere it is: {0}", "DONE");
    }
    static void Main()
    {
        var mi = typeof (Example).GetMethod("Generic");
        mi.MakeGenericMethod(typeof(int)).Invoke(null, null);
    }
}