How to show an image before ending an event? - C #

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How to show an image before ending an event? - C #

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#1 by (2 votes)
#2 by (0 votes)

1

I'm trying to make a loading for a section start form. I have put an animated gif to make the loading effect.

What happens is that when I use the property loading.Visible = true it is not visible until the event click ends.

Here is the code.

private void btnIniciarSesion_Click(object sender, EventArgs e)
{
    loading.Visible = true;
    if (ConectarBaseDatos())
    {
        OpenFormulario();
        this.Close();
    }
    else MessageBox.Show("Usuario o contraseña, incorrectos");
    loading.Visible = false;
}

The Database takes 3 to 6 seconds to respond in the function ConectarVaseDatos() but the gif is not visible until the event ends.

Could someone tell me how could I do this?

c# windows-forms

asked by Jesse R. Jose 22.07.2017 в 17:22

source

2 answers

0

I found a way to do it.

private void btnIniciarSesion_Click(object sender, EventArgs e)
{
   loading.Visible = true;
   Task.Run<bool>(() =>
        {
            return ConnectDataBase();
        })
        .ContinueWith(t =>
        {
            if (t.Result)
            {                   

                if (message == "")
                {
                    lblBienvenido.Text = "Bienvenido\n" + Usuario.Nombre + " " + Usuario.Apellido;
                    ptbLoadin.Visible = !(lblBienvenido.Visible = true);
                    this.Refresh();
                    System.Threading.Thread.Sleep(4000);
                    MDIPrincipal mdip = new MDIPrincipal();
                    this.Hide();
                    mdip.Text += " - ( " + Usuario.Tipo + " )";
                    mdip.Show();
                }
                else if (Usuario.Tipo != "Admin") FrmLogin_Load(null, null);
                else this.Close();

            }
            else resetForm();
        }, TaskScheduler.FromCurrentSynchronizationContext());
}

answered by 21.11.2017 в 16:47

Modal windows Javascript Tsvector of postgres in Laravel 5.3

score 2 · Accepted Answer

Unless you're using an older version of .NET (before .NET 4.5), I recommend using Task using the syntax async/await . This allows the flow of the code to maintain its clarity, but achieves the goal. Note how minimal the changes are compared to your original code:

private async void btnIniciarSesion_Click(object sender, EventArgs e)
{
    loading.Visible = true;
    if (await Task.Run(() => ConectarBaseDatos()))
    {
        OpenFormulario();
        this.Close();
    }
    else MessageBox.Show("Usuario o contraseña, incorrectos");
    loading.Visible = false;
}

The changes are only two:

Add the keyword async in the signature of the btnIniciarSesion_Click method.

Replace ConectarBaseDatos() with await Task.Run(() => ConectarBaseDatos())