Pass value from parent form to child form?

Question

I\'m trying to pass a value set in my parent form to a second form. I created a property with a get part in the parent form.

I don\'t want to do something like:

Answer 1

You have some possibilities here:

Give a Reference from your first Form as value

Form2 secondForm = new Form2(yourForm1);

So you can access via the getter in your first Form. yourForm1.MyValue;

This seems to be a bit ugly. Better is you create a Interface, which hold your Property and is implemented from you first Form.

public interface IValueHolder
{
   public int MyValue {get;}
}

public class FirstForm : Form, IValueHolder
{
   public int MyValue{get;}

   //Do your form stuff

   Form2 form = new Form2(this);
}

So your Form2 just take the Interface and stays independent from Form1. Further you can create a Property on Form2 which you access from Form1. For example if your Property in Form1 changes you set the value from Form2 as well.

public class Form2 : Form
{
   public int MyValue{get;set;}
}

public class Form1 : Form
{
  private int _myValue;
  public int MyValue
  {
     set
     {
        if (_myValue != value)
        {
           form2.MyValue = value;
        }
     }
  }
}

At least you can use a Event maybe. Further you can create a Property on Form2 which holds an Form1 Reference or a IValueHolder as described above.

Hope this helps.