使用 XamDataGrid DataItemUpdateTrigger 更新属性

Question

我在 XamDataGrid 中有一个可编辑的字段，当此字段中的文本发生更改时，我想更新绑定到该字段的属性。我发现这可以通过使用DataItemUpdateTrigger来实现，我如何让它更新属性？

另外，有没有办法在编辑字段时在数据上下文上调用方法？

<igDP:XamDataGrid DataSource="{Binding MapDesignNamesDetailViewModelCollection}" AutoFit="True" GroupByAreaLocation="None">
        <igDP:XamDataGrid.FieldLayoutSettings>
            <igDP:FieldLayoutSettings AutoGenerateFields="False"/>
        </igDP:XamDataGrid.FieldLayoutSettings>
        <igDP:XamDataGrid.FieldLayouts>
            <igDP:FieldLayout>
                <igDP:FieldLayout.Fields>
                    <igDP:Field Name="MapDesignName" Label="Map Design Name" AllowEdit="False"/>
                    <igDP:Field Name="MapDesignDisplayName" Label="Display Name">
                        <igDP:Field.Settings>
                            <igDP:FieldSettings DataItemUpdateTrigger="OnCellValueChange" />
                        </igDP:Field.Settings>
                    </igDP:Field>
                </igDP:FieldLayout.Fields>
            </igDP:FieldLayout>
        </igDP:XamDataGrid.FieldLayouts>
    </igDP:XamDataGrid>

问题似乎是二传手没有被击中，这是我模型的代码：

public class MapDesign : BindableBase
{
    public MapDesign(string mapDesignName, string mapDesignDisplayName)
    {
        MapDesignName = mapDesignName;
        MapDesignDisplayName = mapDesignDisplayName;
    }
    private string _mapDesignName;
    public string MapDesignName
    {
        get { return _mapDesignName; }
        set
        {
            SetProperty(ref _mapDesignName, value);
        }
    }
    private string _mapDesignDisplayName;
    public string MapDesignDisplayName
    {
        get { return _mapDesignDisplayName; }
        set
        {
            SetProperty(ref _mapDesignDisplayName, value);
        }
    }
}

Answer 1

当数据收集项实现 INotifyPropertyChanged 接口时，绑定到字段的属性将自动更新，如下例所示。但是，如果需要在用户修改单元格值时获取事件，则可以使用 CellChanged 事件处理程序。希望有帮助。

XAML：

<igDP:XamDataGrid DataSource="{Binding NamesCollection}"  AutoFit="True" GroupByAreaLocation="None" CellChanged="XamDataGrid1_CellChanged">
  <igDP:XamDataGrid.FieldLayoutSettings>
       <igDP:FieldLayoutSettings AutoGenerateFields="False"/>
  </igDP:XamDataGrid.FieldLayoutSettings>
        <igDP:XamDataGrid.FieldLayouts>
             <igDP:FieldLayout>
                  <igDP:FieldLayout.Fields>
                       <igDP:Field Name="FirstName" Label="First Name" AllowEdit="False"/>
                       <igDP:Field Name="LastName" Label="Last Name">
                           <igDP:Field.Settings>
                                <igDP:FieldSettings DataItemUpdateTrigger="OnCellValueChange" />
                           </igDP:Field.Settings>
                        </igDP:Field>
                  </igDP:FieldLayout.Fields>
            </igDP:FieldLayout>
      </igDP:XamDataGrid.FieldLayouts>
</igDP:XamDataGrid>

代码隐藏：

using System.Windows;
namespace XamDataGridUpdateTrigger
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            NamesCollection.Add(new NamesItem("Sport", "Chief"));
            InitializeComponent();
        }
        public NamesModel NamesCollection
        {
            get { return (NamesModel)GetValue(NamesProperty); }
            set { SetValue(NamesProperty, value); }
        }
        // Using a DependencyProperty as the backing store for Names.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty NamesProperty =
            DependencyProperty.Register("NamesCollection", typeof(NamesModel), typeof(MainWindow), new PropertyMetadata(new NamesModel()));
        private void XamDataGrid1_CellChanged(object sender, Infragistics.Windows.DataPresenter.Events.CellChangedEventArgs e)
        {
            System.Diagnostics.Debug.WriteLine($"{e.Cell}");
        }
    }
}

数据模型：

using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.ComponentModel;
namespace XamDataGridUpdateTrigger
{
    public class NamesModel : NamesDataCollection
    {
        public NamesModel()
        {            
        }
    }
    public class NamesDataCollection : ObservableCollection<NamesItem>
    {
        protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
        {
            base.OnCollectionChanged(e);
        }       
    }
    public class NamesItem : INotifyPropertyChanged
    {
        public NamesItem()
        {            
        }
        public NamesItem(string fname, string lname) 
        {
            FirstName = fname;
            LastName = lname;          
        }
        private string _firstName;
        public string FirstName
        {
            get { return _firstName; }
            set { if (_firstName != value) { _firstName = value; OnPropertyChanged("FirstName"); } }
        }
        private string _lastName;
        public string LastName
        {
            get { return _lastName; }
            set { if (_lastName != value) { _lastName = value; OnPropertyChanged("LastName"); } }
        }
        public event PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            this.PropertyChanged?.Invoke(sender, e);
        }
        protected void OnPropertyChanged(PropertyChangedEventArgs e)
        {
            OnPropertyChanged(this, e);
        }
        protected virtual void OnPropertyChanged(string propertyName)
        {
            OnPropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}