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如何从WPF中的DataGrid控件中删除行?

[英]How to delete a row from DataGrid control in WPF?

I know that I should use PreviewKeyDown event in order to delete a row in DataGrid so I have this code in the UI: 我知道我应该使用PreviewKeyDown事件来删除DataGrid中的一行,所以我在UI中有以下代码:

<DataGrid Name="dgPlaces"
            AutoGenerateColumns="True"
            ItemsSource="{Binding Places}"
            PreviewKeyDown="dgPlaces_PreviewKeyDown"
    />

Then I have this code in the code-behind: 然后,我在后面的代码中有此代码:

private void dgPlaces_PreviewKeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Delete)
    {
        if (dgPlaces.SelectedItems.Count > 0)
        {
            foreach (var row in dgPlaces.SelectedItems)
            {
                //here should be delete logic for each row
            }
        }
    }
}

I have this code in the ViewModel: 我在ViewModel中有以下代码:

public class ViewModel //: INotifyPropertyChanged
{
    public ViewModel()
    {

    }

    private ObservableCollection<Place> places = new ObservableCollection<Place>()
    {
        new Place { Id = 1, City = "New York", Country = "US" },
        new Place { Id = 2, City = "Chicago", Country = "US" },
        new Place { Id = 3, City = "Miami", Country = "US" }
    };

    public ObservableCollection<Place> Places
    {
        get
        {
            return places;
        }
        set
        {
            places = value;
            RaisePropertyChanged("Places");
        }
    }
}

And in the Model class I have Id, City and Country properties: 在Model类中,我具有Id,City和Country属性:

public class Place
{
    public int Id { get; set; }
    public string City { get; set; }
    public string Country { get; set; }
}

My question is related to the loop inside the code-behind file: how to extact Id from the row there so the application can know what row should be deleted? 我的问题与代码隐藏文件内部的循环有关:如何从那里的行中扩展ID,以便应用程序知道应该删除哪一行?

foreach (var row in dgPlaces.SelectedItems)
{
    //here should be delete logic for each row
}

Why I can't just put . 为什么我不能放。 after row and than get Id from IntelliSense? 后排,而不是从IntelliSense获得ID? I don't get it. 我不明白

DataGrid.SelectedItems property is non-generic, it is IList only, row has object type, unless exact type is specified like this: DataGrid.SelectedItems属性是非泛型的,仅是IListrow具有object类型,除非这样指定确切类型:

foreach (Place row in dgPlaces.SelectedItems)
{

}

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