I know there is a lot of questions that can look like this, but i don't realy find anyone answer to my problem here and in another forums.
So, I'm relatively new to WPF and I'm testing data binding, but I'm getting a trouble that data don't get values updated when values of a ObservableCollection get changed.
I will put my exemple were.
Main.xaml
<Window x:Class="TestWPF.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:TestWPF"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid x:Name="MyGrid">
</Grid>
</Window>
Main.xaml.cs
using System.Windows;
namespace TestWPF
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
Stand stand = new Stand("Best Seller Stand");
stand.cars.Add(new Car()
{
ID = "1",
Brand = "BMW",
CarNumber = 165,
HaveRadio = true
});
stand.cars.Add(new Car()
{
ID = "2",
Brand = "Toyota",
CarNumber = 421,
HaveRadio = true
});
stand.cars.Add(new Car()
{
ID = "4",
Brand = "FIAT",
CarNumber = 312,
HaveRadio = false
});
stand.cars.Add(new Car()
{
ID = "3",
Brand = "Ferrari",
CarNumber = 12,
HaveRadio = true
});
MyGrid.Children.Add(stand.GetCatalog());
}
}
}
Car.cs
using System;
namespace TestWPF
{
public class Car : IComparable, IComparable<int>
{
public string ID { get; set; }
public string Brand { get; set; }
public int CarNumber { get; set; }
public bool HaveRadio { get; set; }
public void GerateRandomCarNumber()
{
CarNumber = new Random().Next(int.MinValue, int.MaxValue);
}
public int CompareTo(int other)
{
return CarNumber.CompareTo(other);
}
public int CompareTo(object obj)
{
Car other = null;
if (obj is Car)
other = obj as Car;
return CarNumber.CompareTo(other.CarNumber);
}
}
}
Stand.cs
using System.Collections.Generic;
using System.Linq;
namespace TestWPF
{
public class Stand
{
public Stand(string name)
{
Name = name;
}
public string Name { get; set; }
public SortedSet<Car> cars { get; set; } = new SortedSet<Car>();
public Car BestChoice
{
get
{
return cars.First();
}
}
public StandCatalog Catalog { get; set; } = null;
public StandCatalog GetCatalog()
{
if (Catalog == null)
Catalog = new StandCatalog(this);
return Catalog;
}
}
}
StandCatalog.xaml (UserControl)
<UserControl x:Class="TestWPF.StandCatalog"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:TestWPF"
mc:Ignorable="d"
d:DesignHeight="450" d:DesignWidth="800">
<StackPanel Orientation="Vertical">
<Label Name="StandName" Content="{Binding Model.Name}" Margin="10"/>
<Label Name="CarBrand" Content="{Binding Model.BestChoice.Brand}" Margin="10"/>
<DataGrid AutoGenerateColumns="False" ItemsSource="{Binding CatalogCar}">
<DataGrid.Columns>
<DataGridTextColumn Header="ID" Binding="{Binding ID}"/>
<DataGridTextColumn Header="Brand" Binding="{Binding Brand}"/>
<DataGridTextColumn Header="Car Number" Binding="{Binding CarNumber}"/>
<DataGridCheckBoxColumn Header="Have Radio" Binding="{Binding HaveRadio}"/>
</DataGrid.Columns>
</DataGrid>
<Button Content="Gerate Random Number" Click="btn_GerateRandomNumber"/>
</StackPanel>
</UserControl>
StandCatalog.xaml.cs
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;
namespace TestWPF
{
/// <summary>
/// Interaction logic for StandCatalog.xaml
/// </summary>
public partial class StandCatalog : UserControl
{
public Stand Model { get; init; }
public ObservableCollection<Car> CatalogCar { get; set; }
public StandCatalog()
{
InitializeComponent();
this.DataContext = this;
}
public StandCatalog(Stand model) : this()
{
Model = model;
CatalogCar = new ObservableCollection<Car>(Model.cars);
}
private void btn_GerateRandomNumber(object sender, RoutedEventArgs e)
{
foreach (var item in Model.cars)
{
item.GerateRandomCarNumber();
}
}
}
}
So I get this aplication:
But when I click on the button to gerate random number, the datagrid don't refresh and the label (Name="CarBrand") don't change either... Doesn't data binding refresh the UI when the elements changed its value?
I know that the value changed because when i reorder the datagrid I get this:
Can anyone help me?
Another question, I'm using the class Stand as a Model of the StandCatalog (view/controller), what is the best way to use the SortedSet and the ObservableCollection together? Or should I use a SortedSet in the model?
