CODEWITHSUNDEEP
c#winforms
MacA
MacA

Reputation: 15

How to access list from a child within a child?

I'm working on a program where I let the user add items to a list view. These items are then stored in a list that makes it really easy for me to load the list view on startup using a StreamReader. Now, here's my problem. The user can select an item in the list view and then click a button to show a window that basically shows more information about the item that the user has selected. In order to change, lets say, the name, I want to open yet ANOTHER window where the user can enter the new name which is then changed and saved into the list when pressing a button.

I can easily access the list from the first child by sending an instance of Form1 to Form2 using a constructor. But how do I go about accessing Form1 from Form3 when Form3 is opened from Form2?

I use the following code to access Form1 in Form2:

Form1:

private void button1_Click(object sender, System.EventArgs e)
{  
    Form2 form2 = new Form2(this);
    form2.StartPosition = FormStartPosition.CenterParent;
    form2.ShowDialog(this);
}

Form2:

private Form1 _Form1;

public Form2(Form1 _Form1)
{
    this._Form1 = _Form1;
}

Upvotes: 0

Views: 40

Answers (1)

Rufus L
Rufus L

Reputation: 37030

"how do I go about accessing Form1 from Form3 when Form3 is opened from Form2"

Well, since Form2 has access to the instance of Form1, if Form3 needs it then Form2 can give it.

One way is to pass it through the constructor, as you did previously:

public class Form2
{
    private Form1 _Form1;

    public Form2(Form1 form1)
    {
        this._Form1 = form1;
    }

    // Imaginary method that needs to pass Form1 to Form3
    public string GetName()
    {
        // Pass our reference to Form1 to the constructor of Form3
        Form3 form3 = new Form3(this._Form1);
        form3.StartPosition = FormStartPosition.CenterParent;
        form3.ShowDialog(this);

        return form3.txtName.Text;
    }
}

Upvotes: 1

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