I'm doing a POS for a cafeteria in a hospital and I'm watching some videos in youtube of how to do the POS in c# but I got to this part where he uses ObjectQuery<T> class and when I declare the instance of the object it gives me this error:
Error 2 Argument 2: cannot convert from 'Cafeteria_POS_EF4.BVH_POS_DB_MODEL_EF43' to 'System.Data.Objects.ObjectContext' c:\users\tony's\documents\visual studio 2013\projects\cafeteria_pos_ef4\cafeteria_pos_ef4\cashregister.cs 46 119 Cafeteria_POS_EF4
And this one:
Error 1 The best overloaded method match for 'System.Data.Objects.ObjectQuery.ObjectQuery(string, System.Data.Objects.ObjectContext)' has some invalid arguments c:\users\tony's\documents\visual studio 2013\projects\cafeteria_pos_ef4\cafeteria_pos_ef4\cashregister.cs 46 49 Cafeteria_POS_EF4
I tried searching on the internet for some solution or something but I only find old tutorials and I cant understand what Microsoft says about how to send the constructor arguments... I'm using .NET framework 4 and Visual Studio 2013.
PS - I want to use ObjectQuery because i want to do a foreach loop to fill the TabControl Dynamically from the items in the database
ObjectQuery<pos_item> filteredProduct = new ObjectQuery<pos_item>("SELECT VALUE P FROM pos_item AS P WHERE P.pos_item_group = " + i.ToString(), cse);
If you guys whant to see the whole class ima post it here below thanks in advance for your time and effort
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.Objects;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Cafeteria_POS_EF4
{
public partial class CashRegister : Form
{
private BindingList<pos_item> products = new BindingList<pos_item>();
private BVH_POS_DB_MODEL_EF43 cse = new BVH_POS_DB_MODEL_EF43();
public CashRegister()
{
InitializeComponent();
lboxBasket.DataSource = products;
lboxBasket.DisplayMember = "description";
//pos_item p = new pos_item() { };
CreateTabbedPanel();
FillTabbedPanel();
}
private void CreateTabbedPanel()
{
foreach(pos_item_group ig in cse.pos_item_group)
{
tabControl.TabPages.Add(ig.item_group_id.ToString(), ig.item_group_name);
}
}
private void FillTabbedPanel()
{
int i = 1;
foreach(TabPage tp in tabControl.TabPages)
{
ObjectQuery<pos_item> filteredProduct = new ObjectQuery<pos_item>("SELECT VALUE P FROM pos_item AS P WHERE P.pos_item_group = " + i.ToString(), cse);
FlowLayoutPanel flp = new FlowLayoutPanel();
flp.Dock = DockStyle.Fill;
foreach (pos_item item in filteredProduct)
{
Button b = new Button();
b.Text = item.description;
tp.Controls.Add(b);
}
tp.Controls.Add(flp);
i++;
}
}
}
}
