Get Form1 properties from class

Question

I want to be able to get Form1 properties from within a class. Properties such as Width, Left, WindowState, and so on. So that I can then do this in the class: MessageBox.Show(Form1.Width); So I want to reference the whole Form1. How do I do that in code?

Answer 1

Example 1: Storing the instance in a global variable,

public static Form1 frm1;


//Form1 constructor
frm1 = this;

e.g.

public static Form1 frm1;

public Form1()
{
    InitializeComponent();
    frm1 = this;
    
    MessageBox.Show(Form1.frm1.Width.ToString());
}

Example 2: You need to pass an instance to the class.

public class Class1
{
    private Form1 _frm1;
    public Class1(Form1 frm1)
    {
        this._frm1 = frm1;
    }
}

e.g.

public class Class1
{
    private Form1 _frm1;
    public Class1(Form1 frm1)
    {
        this._frm1 = frm1;
        MessageBox.Show(this._frm1.Width.ToString());
    }
}