[英]DataGridComboboxColumn Binding with ObservableCollection
[英]ObservableCollection with INotifyPropertyChanged into DatagridComboboxColumn Binding
我的小项目现在看起来很不一样。 现在,我有了ObservableCollection PackagesList
,其中包含要与整个DataGrid(通过绑定路径)和ObservableCollection DestinationItememsSource
绑定的数据,我在其中存储DataGridComboboxColumn的案例(作为ItemsSourceBinding)。 DatagridComboboxColumn中的SelectedItem属性是PackageInfo
一个值(它是DestinationNames
c之一)。 在DatagridTextBoxColumns上绑定是可以的。
XAML:
<Window x:Class="test01.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="300" Width="400" Loaded="Window_Loaded">
<Grid>
<Border x:Name="mainBorder" Margin="20">
<DataGrid x:Name="mainDataGrid" x:Uid="mainDataGrid" AutoGenerateColumns="False"
AlternationCount="2" SelectionMode="Single" HorizontalAlignment="Stretch">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Path=id}"
Header="ID" Width="Auto" IsReadOnly="True"/>
<DataGridTextColumn Binding="{Binding Path=name}"
Header="Name" Width="Auto" IsReadOnly="True"/>
<DataGridTextColumn Binding="{Binding Path=quantity}"
Header="Quantity" Width="Auto" IsReadOnly="True"/>
<DataGridTextColumn Binding="{Binding Path=price}"
Header="Price" Width="Auto" IsReadOnly="True"/>
<DataGridComboBoxColumn ItemsSource="{Binding DestinationItemsSource}"
SelectedItemBinding="{Binding Path=destination, UpdateSourceTrigger=PropertyChanged}"
Header="Destination" Width="Auto"/>
</DataGrid.Columns>
</DataGrid>
</Border>
</Grid>
</Window>
C#:
public class PackageInfo
{
public int id { get; set; }
public string name { get; set; }
public int quantity { get; set; }
public double price { get; set; }
public string destination { get; set; }
}
public class DestinationNames : INotifyPropertyChanged
{
public string name { get; set; }
public event PropertyChangedEventHandler PropertyChanged;
public DestinationNames(string value)
{
this.name = value;
}
public string DestinationName
{
get { return name; }
set
{
name = value;
OnPropertyChanged("DestinationName");
}
}
protected void OnPropertyChanged(string name)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
}
public partial class MainWindow : Window
{
public ObservableCollection<DestinationNames> DestinationItememsSource { get; set; }
public ObservableCollection<PackageInfo> PackagesList { get; set; }
public MainWindow()
{
InitializeComponent();
}
public void Window_Loaded(object sender, RoutedEventArgs e)
{
LoadPackages();
}
public void LoadPackages()
{
DestinationItememsSource = new ObservableCollection<DestinationNames>();
DestinationItememsSource.Add(new DestinationNames("London"));
DestinationItememsSource.Add(new DestinationNames("Plymouth"));
DestinationItememsSource.Add(new DestinationNames("Birmingham"));
DestinationItememsSource.Add(new DestinationNames("Cambridge"));
PackagesList = new ObservableCollection<PackageInfo>();
PackagesList.Add(new PackageInfo { id = 1, name = "Potato", quantity = 3, price = 2.2, destination = "London" });
PackagesList.Add(new PackageInfo { id = 2, name = "Tomato", quantity = 5, price = 3.8, destination = "Plymouth" });
PackagesList.Add(new PackageInfo { id = 3, name = "Carrot", quantity = 1, price = 5.1, destination = "London" });
PackagesList.Add(new PackageInfo { id = 4, name = "Pea", quantity = 6, price = 1.8, destination = "Plymouth" });
PackagesList.Add(new PackageInfo { id = 5, name = "Bean", quantity = 2, price = 1.5, destination = "Birmingham" });
mainDataGrid.ItemsSource = PackagesList;
}
}
如何正确绑定此DatagridComboboxColumn? 我应该使用INotifyCollectionChanged吗? 如果我想将datagrid中的所有数据自动与ObservableCollection同步,该怎么办? 请帮助一些例子。
您对DestinationItememsSource的绑定无效,因为它不是PackageInfo
对象的一部分。 您也无法通过FindAncestor或ElementName绑定绑定到Windows DataContext,因为不会将DataGrid列添加到可视树。
我能想到的一种解决方案是使用CollectionViewSource :
<Window.Resources>
<CollectionViewSource Source="{Binding RelativeSource={RelativeSource Self}, Path=DestinationItememsSource}" x:Key="destinations">
<!--here you can also add Group and SortDescriptions-->
</CollectionViewSource>
</Window.Resources>
<DataGridComboBoxColumn ItemsSource="{Binding Source={StaticResource ResourceKey=destinations}}".../>
我无法测试atm,因为我仍在下载VS 2012。^^
另一个方法是简单地将Package of Destinations添加到您的PackageInfo对象(但这会导致很多冗余)。
让PackageInfo实现INotifyPropertyChanged。
一个ObservableCollection自动实现INotifyCollectionChanged。
您将需要添加List或ObservableCollection Destinations作为PackageInfo的属性。
没有类DestinationNames
只是一个类DestinationName
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