Dynamically creating and calling a class using Reflection in a console application

Question

I have some problems about this section in C# language.

So I'm trying to do something like revealing reflection of this class and it's methods.

class Car
{
    public string Name { get; set; }
    public int Shifts{ get; set; }


    public Car(string name, int shifts)
    {
        Name = name;
        Shifts = shifts;
    }

    public string GetCarInfo()
    {
        return "Car " + Name + " has number of shifts: " + Shifts;
    }

}

So I have this class Car, and this method GetCarInfo(), now, I'm trying to: Dynamically create instance of this class Car, and dynamically calling a method GetCarInfo(), I would like to show result in console, but I can't when I run it it shows build errors. The application break every time.

Edit

Errors

Can you explain better what do you mean with "dynamically create instance", "dynamically calling a method", and so on..? What are you trying to do? — n0idea, Feb 13 '19 at 15:40
You mean something like this? https://stackoverflow.com/questions/40915110/reflection-call-constructor-with-parameters — BugCatcherJoe, Feb 13 '19 at 15:42
@n0idea I'll post now a build errors and code so you could maybe better understand.. Wait a second please. — xVenum.dll, Feb 13 '19 at 15:58
@BugCatcherJoe I'm new to this, but I think it is not the same. — xVenum.dll, Feb 13 '19 at 15:59
@xVenum.dll Hi, i created a console application with an example, i think this is what you want. — João Paulo Amorim, Feb 13 '19 at 16:08
@JoãoPauloAmorim Same error, "System.ArgumentNullException: 'Value cannot be null. Parameter name: type'" — xVenum.dll, Feb 13 '19 at 16:22
@xVenum.dll As I said in the comment on the code, be careful with the namespace, you need the full namespace of the class to get the type, as I showed in the example Type.GetType("ConsoltedeTEstes.Car"); — João Paulo Amorim, Feb 13 '19 at 16:24
@JoãoPauloAmorim My mistake again.. It works, but it isn't showing anything is this okay? — xVenum.dll, Feb 13 '19 at 16:27
@xVenum.dll your method GetCarInfo returns a string, so you must do a Console.WriteLine(returnOfMethd), please debug the method and see if var returnOfMethod = method.Invoke(dinamycCar, new string[0]); the varible returnOfMethod has the string you want — João Paulo Amorim, Feb 13 '19 at 16:31
@JoãoPauloAmorim Thanks, it works. I'm trying this for days.. — xVenum.dll, Feb 13 '19 at 16:36
You are welcome, please, note that when a function returns a string, it doesnt necessarily do anything, you must work with the string you get, please feel free to ask any doubts you have — João Paulo Amorim, Feb 13 '19 at 16:37

score 2 · Answer 1 · edited Dec 02 '19 at 10:46

Here's a example

namespace ConsoltedeTEstes
  {
 class Program
 {
    static void Main(string[] args)
    {
        //Get the type of the car, be careful with the full name of class
        Type t = Type.GetType("ConsoltedeTEstes.Car");

        //Create a new object passing the parameters
        var dynamicCar = Activator.CreateInstance(t, "User", 2);

        //Get the method you want
        var method = ((object)dynamicCar).GetType().GetMethod("GetCarInfo");

        //Get the value of the method
        var returnOfMethod = method.Invoke(dynamicCar, new string[0]);

        Console.ReadKey();
    }
}

public class Car
{
    public string Name { get; set; }
    public int Shifts { get; set; }


    public Car(string name, int shifts)
    {
        Name = name;
        Shifts = shifts;
    }

    public string GetCarInfo()
    {
        return "Car " + Name + " has number of shifts: " + Shifts;
    }

}


}

Dynamically creating and calling a class using Reflection in a console application

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