CODEWITHSUNDEEP
c#
user3216114
user3216114

Reputation: 325

How to reuse event

I am creating one c# project. In this project I have one mdi form and many child forms.
All the child forms contains one panel named as panel1.
Now when child form opens i use the following code in all child form

all child forms' load event contains the following line.

this.WindowState = FormWindowState.Maximized;

and all child forms' resize event contains the following line.

panel1.Left = (this.ClientSize.Width - panel1.Width) / 2;
panel1.Top = (this.ClientSize.Height - panel1.Height) / 2;

so my question is if possible that the above code i write only once so i donot write this code in all the child forms load and resize event.

Upvotes: 1

Views: 185

Answers (3)

Shamim
Shamim

Reputation: 444

I think the best way is to do it before opening the child form!

public class ChildForm : Form
{
    public void doTheSizing()
    {
        // make it maximize...
        // your sizing of pannel...
        // etc...
    }
}
public partial class ParentForm : Form
{
    public ParentForm()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        ChildForm childForm01 = new ChildForm();
        childForm01.doTheSizing();

        // now show the child window using Show() or ShowDialog().
        childForm01.ShowDialog();
    }
}

Upvotes: 0

Yurii
Yurii

Reputation: 4911

Yes it is possible. You have to pull up common functionality into base class event handlers, and then invoke them from child ones:

public partial class BaseForm : Form
{
    public BaseForm()
    {
        InitializeComponent();
        this.Load += new System.EventHandler(this.FormLoad);
        this.Resize += new System.EventHandler(this.FormResize);
    }

    protected virtual void FormLoad(object sender, EventArgs e)
    {
        this.WindowState = FormWindowState.Maximized;
    }

    protected virtual void FormResize(object sender, EventArgs e)
    {
        panel1.Left = (this.ClientSize.Width - panel1.Width) / 2;
        panel1.Top = (this.ClientSize.Height - panel1.Height) / 2;
    }
    ...
}

public class DerivedForm : BaseForm
{
    protected override void FormLoad(object sender, EventArgs e)
    {
        base.FormLoad(sender, e);
        // specific code goes here
    }

    protected override void FormResize(object sender, EventArgs e)
    {
        base.FormResize(sender, e);
        // specific code goes here
    }
    ...
}

Upvotes: 1

Patrick Hofman
Patrick Hofman

Reputation: 157118

Create a base class and derive every child class from it.

Like this:

public class FormBase : Form
{
    public FormBase()
    {
        this.WindowState = FormWindowState.Maximized;

        // put more generic code here
    }

    ... // or here
}

public class YourMdiChild : FormBase
{
    ... // all code specific for that child
}

Upvotes: 0

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