Adding a string to a listbox from textbox-CodePudding

thanks for your help, I have a listbox where I am inserting a string, however when I select that new line I receive the following error: System.InvalidCastException: 'No se puede convertir un objeto de tipo 'System.String' al tipo 'TESTLSD.Registro'.' This is my code:

private void btnNuevoRegistro_Click(object sender, EventArgs e)
 {
   if (txtNuevoRegistro.Text.Length > 0)
    {
      lstLSD.Items.Insert(lstLSD.SelectedIndex   1, Convert.ToString(txtNuevoRegistro.Text));
                txtNuevoRegistro.Clear();
    }
    else MessageBox.Show("No hay registro para adicionar");

 }

And

this is my SelectedIndexChange

private void lstLSD_SelectedIndexChanged(object sender, EventArgs e)
   {
     if (this.lstLSD.SelectedIndex != -1)
       {
         registroSeleccionado = (Registro)this.lstLSD.SelectedItem;
         label2.Text = "Registro "   registroSeleccionado;
         string item = lstLSD.SelectedItem.ToString();
         if (item.StartsWith("01")) { button1.Enabled = true; } else { button1.Enabled = false; };
         if (item.StartsWith("02")) { button3.Enabled = true; } else { button3.Enabled = false; };
         if (item.StartsWith("03")) { button4.Enabled = true; } else { button4.Enabled = false; };
         if (item.StartsWith("04")) { button5.Enabled = true; } else { button5.Enabled = false; };
       }
  }

Any idea so I can select this line after adding it? THANKS!

CodePudding user response：

I assume its this line thats failing

registroSeleccionado = (Registro)this.lstLSD.SelectedItem;

you are trying to cast a string to so you can assign it to registroSeleccionado which I assume is of type TESTLSD.Registro

You are trying to cast a string to it, that wont work. What is the relationship between that string and that class. If you had the class instance origially try setting the ListItem.Tag to that instance,