I want to add two lists to the box. It doesn't have a problem with adding items to the listbox, but a problem occurs when I try to click on one of the items and show a related form with details filled in to allow users to make amendments. Obviously the form didn't show, but instead an error occurs, no matter if I was try to open the form "delivery" or "pickup". The problem still occurs on one line
Error:
An unhandled exception of type 'System.InvalidCastException' occurred in coursework2.exe
Additional information: Unable to cast object of type 'System.String' to type 'coursework2.Pickup'.
namespace coursework2
{
public partial class MainForm : Form
{
private DeliveryForm deliveryform = new DeliveryForm();
private List<Visit> requests = new List<Visit>();
private Visit theVisit = new Visit();
private PickupForm pickupform = new PickupForm();
public void requestVisit(Visit newVisit)
{
requests.Add(newVisit);
}
public MainForm()
{
InitializeComponent();
}
private void btnNpickup_Click(object sender, EventArgs e)
{
pickupform.pickup = new Pickup();
pickupform.ShowDialog();
if (pickupform.pickup != null)
{
Pickup newPu = pickupform.pickup;
theVisit.addPick(newPu);
List<String> listOfPic = theVisit.listofPicks();
listboxVisits.Items.AddRange(listOfPic.ToArray());
}
updateList();
//this will upload details from pickup form to the list
}
private void groupBox2_Enter(object sender, EventArgs e)
{
}
private void MainForm_Load(object sender, EventArgs e)
{
}
private void btnNdelivery_Click(object sender, EventArgs e)
{
deliveryform.delivery = new Delivery();
deliveryform.ShowDialog();
if (deliveryform.delivery != null)
{
Delivery newDe = deliveryform.delivery;
theVisit.addDeliver(newDe);
List<String> listOfDel = theVisit.listofDeliver();
listboxVisits.Items.AddRange(listOfDel.ToArray());
}
updateList();
//this will upload detail of the delivery to the list
}
private void btnVall_Click(object sender, EventArgs e)
{
}
private void updateList()
{
listboxVisits.Items.Clear();
List<String> listofVis = theVisit.LisitVisits();
listboxVisits.Items.AddRange(listofVis.ToArray());
}
private void listboxVisits_SelectedIndexChanged(object sender, EventArgs e)
{
listboxVisits.FormattingEnabled = false;
int index = listboxVisits.SelectedIndex;
if (listboxVisits.SelectedItems.Count>0)
{
object object1 = listboxVisits.SelectedItems[0];
if (object1 is Delivery)
{
Delivery deliver = (Delivery)object1;
deliveryform.delivery = deliver;
deliveryform.ShowDialog();
}
else
{
Pickup pick = (Pickup)object1;// this is where error occur
pickupform.pickup = pick;
pickupform.ShowDialog();
}
}
this is the pickup class
public class Pickup
{
private string pickupname;
private string pickupaddress;
private Visit collects;
private Delivery sends;
private DateTime pdatetime;
private string dname;
private string daddress;
private DateTime dtime;
public string PickupName
{
get { return pickupname; }
set { pickupname = value; }
}
public string PickupAddress
{
get { return pickupaddress; }
set { pickupaddress = value; }
}
public string Dname
{
get { return dname; }
set { dname = value; }
}
public string Daddress
{
get { return daddress; }
set {daddress = value; }
}
public DateTime Pdatetime
{
get { return pdatetime; }
set { pdatetime = value; }
}
public DateTime Dtime
{
get { return dtime; }
set { dtime = value; }
}
public override string ToString()
{
return pickupname + " " + pickupaddress + " " + pdatetime.ToString()+" "+dname+" "+daddress+" "+dtime.ToString()+" Pickup ";
}
}
this is the visit class
public class Visit : Customer
{
private Customer requester;
private DateTime datetime;
private Delivery reciever;
private Pickup collect;
public DateTime DateTime
{
get { return datetime; }
set { datetime = value; }
}
private List<Pickup> picks = new List<Pickup>();
private List<Visit> visits = new List<Visit>();
private List<Delivery> deliver = new List<Delivery>();
public void addDeliver(Delivery de)
{
//adding new Delivery ToString the visit
deliver.Add(de);
}
public List<String> listofDeliver()
{
List<string> listofDeliver = new List<string>();
foreach (Delivery de in deliver)
{
String deAsString = de.ToString();
listofDeliver.Add(deAsString);
}
return listofDeliver;
}
public Delivery getDeliver(int index)
{
int count = 0;
foreach (Delivery de in deliver)
{
if (index == count)
return de;
count++;
}
return null;
}
public void addPick(Pickup pu)
{
picks.Add(pu);
}
public List<String> listofPicks()
{
List<string> listofPicks = new List<string>();
foreach (Pickup pu in picks)
{
String puAsString = pu.ToString();
listofPicks.Add(puAsString);
}
return listofPicks;
}
public Pickup getPicks(int index)
{
int count = 0;
foreach (Pickup pu in picks)
{
if (index == count)
return pu;
count++;
}
return null;
}
public List<String> LisitVisits()
{
List<String> visits = new List<string>();
visits.AddRange(listofDeliver());
visits.AddRange(listofPicks());
return visits;
}
public Visit getVisits(int index)
{
int count = 0;
foreach (Visit vis in visits)
{
if (index == count)
return vis;
count++;
}
return null;
}
public string VisitDetails()
{
return collect.PickupName + " " + collect.PickupAddress + " Pickup " + reciever.DeliveryName + " " + reciever.DeliveryAddress + " Delivery";
}
}
