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Manhattanisgr8

Need help creating new objects based on user input

2 posts in this topic

I am playing around with windows forms and was wondering if there was a way to create a new object based on user input. Basically I want to be able to create a new object with what ever the user puts into the make textbox, add it to a List<Car>() and then display the model in the listbox. Just need to know if there is a way to make an object without knowing the name (such as Car xxx = new Car(make, model, year)) or knowing how many objects will be created and be able to pass in parameters. Below is the code for the simple car class and a screen capture of the program:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CreateNewObjectsTest
{
    class Car
    {
        private string make;
        private string model;
        private int year;

        public Car(string make, string model, int year)
        {
            this.make = make;
            this.model = model;
            this.year = year;
        }

        public string GetModel()
        {
            return model;
        }
    }
}

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Should be simple. Add an event handler to your create button and read the values of your text boxes.
public class Form1 : Form
{
  private readonly List<Car> _cars = new List<Car>();

  public Form1()
  {
    InitialiseComponent();

    btnCreate.Click += CreateCar;
  }

// ignore the params, they are required to match the event signature
  private void CreateCar(object sender, EventArgs args) 
  {
    _cars.Add(
      new Car(txtMake.Text, txtModel.Text, 
         int.Parse(txtYear.Text))); // need to convert year to integer

    // possibly some code to update the listbox, depending on how you populate it
  }
}
Also note that typically in C# you wouldn't have a GetModel() method, but more commonly a Model property (possibly readonly, depending on your design).
 
    class Car
    {
        public Car(string make, string model, int year)
        {
            Make = make;
            Model = model;
            Year = year;
        }

        public string Make {get; private set; }
        public string Model {get; private set; }
        public int Year {get; private set; }

    }
obviously that's very rough code and doesn't do any validation or error handling, but hopefully it should point you in the right direction
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_cars.Add( new Car(txtMake.Text, txtModel.Text, int.Parse(txtYear.Text))); // need to convert year to integer

 

Perfect, exactly what I was looking for. As far as populating the list box, all I did was override the ToString method to display the model of each car added.

 

Couldn't remember the easy way to use the getters and setters in C#. Decided to jump back into C# again after taking a programming class that uses java, just to transfer to a university that uses C++. Still enjoy coding in C#.

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