Question

我有一个应用程序，使用数据网格显示DbSet（实体框架5）。当我使用代码更改某些实体时，最终用户必须执行某些操作（如重新排序列或编辑单元格）以更新数据网格。

XAML：

<CollectionViewSource x:Key="componentViewSource" d:DesignSource="{d:DesignInstance {x:Type Models:Component}, CreateList=True}"/>

<TabItem Header="Components">
    <DataGrid x:Name="componentDataGrid" AutoGenerateColumns="False" EnableRowVirtualization="True" 
                ItemsSource="{Binding Source={StaticResource componentViewSource}}" RowDetailsVisibilityMode="VisibleWhenSelected">
        <DataGrid.Columns>
            <DataGridTextColumn x:Name="componentTypeColumn" Binding="{Binding ComponentType}" Header="Component Type" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="descriptionColumn1" Binding="{Binding Description}" Header="Description" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="catalogNumberColumn1" Binding="{Binding CatalogNumber}" Header="Catalog Number" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="commentColumn1" Binding="{Binding Comment}" Header="Comment" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="digiKeyColumn" Binding="{Binding DigiKey}" Header="Digi Key" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="farnellColumn" Binding="{Binding Farnell}" Header="Farnell" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="inStockColumn" Binding="{Binding InStock}" Header="In Stock" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="minimumStockColumn" Binding="{Binding MinimumStock}" Header="Minimum Stock" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="manufacturerColumn" Binding="{Binding Manufacturer}" Header="Manufacturer" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="manufacturerPNColumn" Binding="{Binding ManufacturerPN}" Header="Manufacturer PN" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="mouserColumn" Binding="{Binding Mouser}" Header="Mouser" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="packageColumn" Binding="{Binding Package}" Header="Package" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="priceColumn" Binding="{Binding Price}" Header="Price" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="subTotalColumn" Binding="{Binding SubTotal}" Header="Sub Total" IsReadOnly="True" Width="SizeToHeader"/>
            <DataGridTextColumn x:Name="valueColumn" Binding="{Binding Value}" Header="Value" Width="*"/>
        </DataGrid.Columns>
    </DataGrid>
</TabItem>

C＃：

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    // That's a private field.
    componentViewSource = (CollectionViewSource)FindResource("componentViewSource");

    // That's the database context.
    db = new PotatoContext();
    db.Components.Load();
    componentViewSource.Source = db.Components.Local;
}
private void Manufacture_Product_Click(object sender, RoutedEventArgs e)
{
    var product = productDataGrid.SelectedItem as Product;
    if(product == null)
        return;
    ManufactureProduct d = new ManufactureProduct(product, db);
    d.Owner = this;
    d.ShowDialog();
    if (d.DialogResult ?? false)
    {
        foreach (var comp in product.Components)
        {
            comp.Component.InStock -= comp.Quantity * d.NumberOfUnits;
        }
        db.SaveChanges();
        var fileName = string.Format("{0}{1}{2}{3}.txt", ReportGenerator.ProductReportsFolder,
            System.IO.Path.DirectorySeparatorChar, product.Name, DateTime.Now.ToString("d.MMM.yyyy HH.mm"));
        using(var file = File.Create(fileName)) 
        {
            ReportGenerator.GenerateProductionReport(file, product, d.NumberOfUnits);
        }
    }

}

在第二个事件处理程序内部的foreach循环中，我更改了一个组件的属性（它已经是PotatoContext的一部分），然后我保存了上下文。

当我查看数据网格时，旧值仍然保留，我需要在某个单元格上进入编辑模式以更新该特定单元格，或者单击列标题以更新所有单元格。

这让我感到困扰，因为一个不知情的用户可能不知道这样做。如何从代码中刷新组件？（我试过Grid.Items.Refresh（）;）

更新WPF网格

0 个答案: