WPF DataGrid 列：如何管理值更改事件
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WPF DataGrid columns: how to manage event of value changing
提问by FrancescoDS
In my WPF C# project, I have a Datagrid as follows:
在我的 WPF C# 项目中，我有一个 Datagrid，如下所示：
<DataGrid x:Name="FixedPositionDataGrid" HorizontalAlignment="Left" Margin="33,229,0,0" VerticalAlignment="Top" Width="172" Height="128" AutoGenerateColumns="False" FontSize="10" CanUserAddRows="False">
<DataGrid.Columns>
<DataGridTextColumn Header="indice" Binding="{Binding index}" IsReadOnly="True"/>
<DataGridTextColumn Header="%" Binding="{Binding percentage}" />
<DataGridComboBoxColumn x:Name="DataGridComboBoxColumnAlignment" Header="Allineamento barre" SelectedValueBinding="{Binding alignment}"/>
</DataGrid.Columns>
</DataGrid>
I need to have an event that manages the value changing in second and third columns (that is "%" and "Allineamento barre"). No need about the value inserted, I just need to raise an event when one of values are changed. How can I perform it? I need the way to define the event method in which I can define some operations to do. I've read this how to raise an event when a value in a cell of a wpf datagrid changes using MVVM?but I don't have an observable collection linked to datagrid.
我需要一个事件来管理第二列和第三列中的值变化（即“%”和“Allineamento barre”）。不需要插入的值，我只需要在更改其中一个值时引发一个事件。我该如何执行？我需要定义事件方法的方法，我可以在其中定义一些操作。我读过这篇如何在 wpf 数据网格的单元格中的值使用 MVVM 更改时引发事件？但我没有链接到数据网格的可观察集合。
EDIT: The Datagrid ItemSource is linked with the following objects:
编辑：Datagrid ItemSource 与以下对象链接：
public class FixedPosition
{
[XmlAttribute]
public int index { get; set; }
public int percentage { get; set; }
public HorizontalAlignment alignment { get; set; }
}
How can I modify it to obtain the result expected?
如何修改它以获得预期的结果？
Thanks
谢谢
回答by Sheridan
You seemto be looking at this problem from a WinForms perspective. In WPF, we generally prefer to manipulate data objects rather than UI objects. You said that don't have an ObservableCollection<T>for your items, but I would recommend that you use one.
您似乎是从 WinForms 的角度来看这个问题的。在 WPF 中，我们通常更喜欢操作数据对象而不是 UI 对象。你说ObservableCollection<T>你的物品没有一个，但我建议你使用一个。
If you don't have a data type class for your data, then I'd advise you to create one.
You should then implement the INotifyPropertyChangedinterface in it.
如果您的数据没有数据类型类，那么我建议您创建一个。然后，您应该INotifyPropertyChanged在其中实现接口。
After doing this and setting your collection property as the ItemsSourceof your DataGrid, then all you need to do is to attach an INotifyPropertyChangedhandler to your selected data type:
执行此操作并将您的集合属性设置为 的ItemsSource之后DataGrid，您需要做的就是将INotifyPropertyChanged处理程序附加到您选择的数据类型：
In the view model:
在视图模型中：
public ObservableCollection<YourDataType> Items
{
get { return items; }
set { items = value; NotifyPropertyChanged("Items"); }
}
public YourDataType SelectedItem
{
get { return selectedItem; }
set { selectedItem = value; NotifyPropertyChanged("SelectedItem"); }
}
In the view model constructor:
在视图模型构造函数中：
SelectedItem.PropertyChanged += SelectedItem_PropertyChanged;
In the view model:
在视图模型中：
private void SelectedItem_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
// this will be called when any property value of the SelectedItem object changes
if (e.PropertyName == "YourPropertyName") DoSomethingHere();
else if (e.PropertyName == "OtherPropertyName") DoSomethingElse();
}
In the UI:
在用户界面中：
<DataGrid ItemsSource="{Binding Items}" SelectedItem="{Binding SelectedItem}" ... />
