Question

我可以更改数据网格中的quanity列的值，但我似乎无法使用celleditending事件更新同一行的总价格列这是我的xaml

<DataGrid AutoGenerateColumns="False" EnableColumnVirtualization="False" EnableRowVirtualization="False" IsSynchronizedWithCurrentItem="True" SelectedItem="{Binding SelectedItem}" Grid.Row="3" Grid.ColumnSpan="2" Name="DataGrid1" ItemsSource="{Binding DataGridItemsSource, Mode=TwoWay, IsAsync=True}" Margin="10,10,10,10" PreviewKeyDown="DataGrid1_PreviewKeyDown" SelectionChanged="DataGrid1_SelectionChanged" CellEditEnding="DataGrid1_CellEditEnding" BeginningEdit="DataGrid1_BeginningEdit" >
    <DataGrid.Columns>
        <DataGridTextColumn Header="Item Name" IsReadOnly="True" Binding="{Binding Path=ItemName}" Width="*"></DataGridTextColumn>
        <DataGridTextColumn Header="Item Price" IsReadOnly="True"  Binding="{Binding Path=ItemPrice}" Width="*"></DataGridTextColumn>
        <DataGridTextColumn x:Name="QuantityColumn" Header="Quantity" IsReadOnly="False"  Binding="{Binding Path=Quantity, Mode=TwoWay}" Width="*"></DataGridTextColumn>
        <DataGridTextColumn  Header="Total Price" IsReadOnly="True" Binding="{Binding Path=TotalPrice, Mode=TwoWay}" Width="*"></DataGridTextColumn>
    </DataGrid.Columns>
</DataGrid>

这是我的＃WPF for

private void DataGrid1_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
{
    DataGrid dg = sender as DataGrid;
    AddItem row = (AddItem)dg.SelectedItems[0];
}

从这里我可以轻松获得数量的新值，但似乎无法弄清楚如何更新同一行的datagrid.itemsource的totalprice列。任何帮助将不胜感激

public class AddItem : INotifyPropertyChanged
        {
            public event PropertyChangedEventHandler PropertyChanged;
            public string ItemName { get; set; }
            public float ItemPrice { get; set; }
            public string Price { get; set; }
            public int Quantity { get; set; }
            public decimal TotalPrice { get; set; }
            public int Size
            {
                get { return Quantity; }
                set
                {
                    Quantity = value;
                    if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("Size"));
                }
            }
        }

这是Additem我缺少的东西

Answer 1

假设TotalPrice = Quantity * ItemPrice，并且已经是AddItem的计算属性，则需要为每个项添加PropertyChanged处理程序：

foreach (var item in DataGridItemsSource)
{
    item.PropertyChanged += item_PropertyChanged;
}

并添加处理程序：

private void item_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
    switch (e.PropertyName)
    {
        case "Quantity":
        case "ItemPrice":
            PropertyChanged(this, "TotalPrice");
            break;
    }
}

这将告诉用户界面总价格已经改变，并将相应地更新网格。

另一种解决方案是扩展AddItem类以发送PropertyChanged事件。这会将事件发送到使用类的任何地方，而不仅仅是在这个特定的视图模型上。

您的视图模型必须实现INotifyPropertyChanged才能实现此目的。

通过更改另一个来更改datagrid中一列的值

1 个答案: