Wpf datagrid row not updating when updating bound collection?

Question

I have a product class named Products.cs

class Products : INotifyPropertyChanged
{
    private int productId = 0;
    private int quantity = 0;
    private string description = string.Empty;
    private decimal price = 0.0m;

    public event PropertyChangedEventHandler PropertyChanged;

    public Products()
    {
    }

    private void OnPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    #region Properties

    public int ProductID
    {
        get { return this.productId; }
        set
        {
            if (value != productId)
            {
                this.productId = value;
                OnPropertyChanged("ProductID");
            }
        }
    }

    public int Quantity
    {
        get { return this.quantity; }
        set
        {
            if (value != this.quantity)
            {
                this.quantity = value;
                OnPropertyChanged("Quantity");
                OnPropertyChanged("SubTotal");
            }

        }
    }

    public String Description
    {
        get { return this.description;}
        set
        {
            if (value != this.description)
            {
                this.description = value;
                OnPropertyChanged("Description");
            }
        }
    }

    public Decimal Price
    {
        get { return this.price; }
        set
        {
            if (value != this.price)
            {
                this.price = value;
                OnPropertyChanged("Price");
            }
        }
    }

    public Decimal SubTotal
    {
        get { return Quantity * Price; }
    }

    public static List<Products> ProductList
    {
        get { return new List<Products>(); }
    }     

    #endregion
}

Then I have BilClass.cs to implement, edit and remove items from the list.

class BillClass
{
    public List<Products> ProductsList = new List<Products>();
    Products products;

    public BillClass()
    {
        AddProducts(1, 2, 20.00m, "a");            
    }

    public void AddProducts(int _pid, int _quantity, decimal _price, string _desc)
    {
        products = new Products();
        products.ProductID = _pid;
        products.Quantity = _quantity;
        products.Price = _price;            
        products.Description = _desc;

        ProductsList.Add(products);
    }

    public bool RemoveProduct(int _id)
    {
        ProductsList.Remove(ProductsList.Find(e => e.ProductID.Equals(_id)));
        return true;
    }

    public void EditProducts(int _pid, int _quantity)
    {
        Products ob = ProductsList.Find(e => e.ProductID.Equals(_pid));
        ob.Quantity = _quantity;            
    }

    public List<Products> GetItems()
    {
        return ProductsList;
    }

I linked this "ProductList" to the wpf datagrid. This datagrid shows the item already in the collection (data added in the BillClass constructor), but does not show the new item added through the sales window containing the DataGrid.

XAML DataGrid Code

<Custom:DataGrid ItemsSource="{Binding Path=ProductsList}" Margin="16,100,16,120" AutoGenerateColumns="False" x:Name="dataGrid" HorizontalGridLinesBrush="#FFD0D0D0" 
            VerticalGridLinesBrush="#FFD0D0D0" CanUserDeleteRows="True" CanUserResizeRows="False" Background="White" IsTabStop="False" Focusable="False" IsReadOnly="True" CanUserSortColumns="False" CanUserResizeColumns="False" CanUserReorderColumns="False" GridLinesVisibility="Horizontal" EnableRowVirtualization="False">
            <Custom:DataGrid.Columns>
                <Custom:DataGridTextColumn Binding="{Binding Path=ProductID}" Header="Sl" Width="40" IsReadOnly="True" CanUserSort="False" CanUserResize="False" CanUserReorder="False" />
                <Custom:DataGridTextColumn Binding="{Binding Path=ProductID}" Header="Product Code" Width="100" IsReadOnly="True" CanUserSort="False" CanUserResize="False" CanUserReorder="False" />
                <Custom:DataGridTextColumn Binding="{Binding Path=Description}" Header="Description" Width="250" IsReadOnly="True" CanUserSort="False" CanUserResize="False" CanUserReorder="False" />
                <Custom:DataGridTextColumn Binding="{Binding Path=Price}" Header="Unit Price (in Rs.)" Width="120" IsReadOnly="True" CanUserSort="False" CanUserResize="False" CanUserReorder="False" />
                <Custom:DataGridTextColumn Binding="{Binding Path=Quantity}" Header="Quantity" Width="120" IsReadOnly="True" CanUserSort="False" CanUserResize="False" CanUserReorder="False" />
                <Custom:DataGridTextColumn Binding="{Binding Path=SubTotal, Mode=OneWay}" Header="Total (in Rs.)" Width="120" IsReadOnly="True" CanUserSort="False" CanUserResize="False" CanUserReorder="False" />                                         
            </Custom:DataGrid.Columns>                      
        </Custom:DataGrid>

Some code will help

thank

Answer 1

Product INotifyPropertyChanged, , . WPF. -

public class Produts : INotifyPropertyChanged
    {
public Produts()
        {

        }
    int productID;
    public int ProductID
    {
        get { return productID; }
        set
        {
            if (productID != value)
            {
                productID = value;
                OnPropertyChange("ProductID");
            }
        }
    }
    int quantity;
    public int Quantity
    {
        get { return quantity; }
        set
        {
            quantity = value;
            OnPropertyChange("Quantity");
            //Force Subtotal to be updated
            OnPropertyChange("SubTotal");
        }
    }
    string description;
    public string Description
    {
        get { return description; }

        set
        {
            description = value;
            OnPropertyChange("Description");
        }
    }
    decimal price;
    public decimal Price
    {
        get { return price; }
        set
        {
            price = value;
            OnPropertyChange("Price");
            //Force Subtotal to be updated
            OnPropertyChange("SubTotal");
        }
    }
    public decimal SubTotal
    {
        get { return Quantity * Price; }
    }

    public static List<Produts> ProductList
    {
        get
        {
            return new List<Produts>();
        }
    }
    public event PropertyChangedEventHandler PropertyChanged;
    private void OnPropertyChange(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

XAML:

<DataGrid ItemsSource="{Binding Path=ProductList}" AutoGenerateColumns="False">
            <DataGrid.Columns>
                <DataGridTextColumn Header="ID" Binding="{Binding Path= ProductID}"/>
                <DataGridTextColumn Header="Quantity" Binding="{Binding Path=Quantity}"/>
                <DataGridTextColumn Header="Description" Binding="{Binding Path=Description}"/>
                <DataGridTextColumn Header="Price" Binding="{Binding Path=Price}"/>
                <DataGridTextColumn Header="Subtotal" Binding="{Binding Path=SubTotal, Mode=OneWay}"/>
            </DataGrid.Columns>
        </DataGrid>

base.DataContext = new Produts();

Answer 2

List ObservableCollection. , , (, , ..). , , . INotifyPropertyChanged WPF.