如何从WPF中的DataGrid控件中删除一行?

时间:2016-07-03 16:25:23

标签: c# wpf xaml mvvm datagrid

我知道我应该使用PreviewKeyDown事件来删除DataGrid中的一行,所以我在UI中有这个代码:

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

然后我在代码隐藏中使用了这段代码:

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
            }
        }
    }
}

我在ViewModel中有这段代码:

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");
        }
    }
}

在Model类中,我有Id,City和Country属性:

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

我的问题与代码隐藏文件中的循环有关:如何从那里的行中取代Id,以便应用程序可以知道应该删除哪一行?

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

为什么我不能放。在行之后,而不是从IntelliSense获取Id?我不明白。

1 个答案:

答案 0 :(得分:1)

DataGrid.SelectedItems属性是非通用的,仅IListrow具有object类型,除非指定了确切的类型:

foreach (Place row in dgPlaces.SelectedItems)
{

}