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Accepted
Daniel Rivas
Asked: 2021-10-20 07:09:26 +0800 CST 2021-10-20 07:09:26 +0800 CST

Load code in a void Load for C# form

  • 772

Good day!

I have a piece of code in a button, which counts updates and deletes from the database. To insert a new form is opened , and when inserted it returns to the main form .

My question is, how can I do so that when I return from the insert form to the main one, it updates automatically (without clicking the button)?

I attach code, thanks.

private void LoadCounters()
{
    // get contact counters for current login
    var dic = DaoWaybill.GetReceiverInformation(Constants.strIdUser, Constants.strUsername);
    lblGuides.Text = dic.FirstOrDefault(x => x.Key == "guides").Value;

    lblContactIncident.Text = dic.FirstOrDefault(x => x.Key == "total_incident").Value;
    lblContactConfirmed.Text = dic.FirstOrDefault(x => x.Key == "total_confirmed").Value;
}

Current button code ( Click event ):

private void radButton2_Click(object sender, EventArgs e)
{
    LoadCounters();
}
c#

1 Answers

  1. Best Answer

    As gbianchi comments , you can "wire" two forms so that the child accesses methods of the parent when needed.

    You can achieve this by passing the parent form to the child form's constructor.

    public class FormularioPrincipal : Form
{
    ...

    public void LoadCounters() { ... }

    public void botonAbrirFormularioSecundario_Click(object sender, EventArgs e)
    {
        FormularioSecundario secundario = new FormularioSecundario(this);
        ...
    }
}

public class FormularioSecundario : Form
{
    private FormularioPrincipal formularioPrincipal;

    public FormularioSecundario(FormularioPrincipal formularioPrincipal)
    {
        this.formularioPrincipal = formularioPrincipal;
        ...
    }

    ...

    public void metodo()
    {
        ...
        formularioPrincipal.LoadCounters();
    }
}

    This approach sometimes forces a form's internal methods, or properties, to be public, in order to be accessible from the child form.

    A somewhat more selective alternative might be to pass the counter refresh action itself to the child form's constructor.

    public class FormularioPrincipal : Form
{
    ...

    private void LoadCounters() { ... }

    public void botonAbrirFormularioSecundario_Click(object sender, EventArgs e)
    {
        FormularioSecundario secundario = new FormularioSecundario(() => LoadCounters());
        ...
    }
}

public class FormularioSecundario : Form
{
    private Action refrescarContadores;

    public FormularioSecundario(Action refrescarContadores)
    {
        this.refrescarContadores = refrescarContadores;
    }

    public void metodo()
    {
        ...
        refrescarContadores?.Invoke();
    }
}
    • 2