实现DataGrid的SelectedItems的绑定

DMS.WPF/Helper/SelectedItemsBehavior.cs

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+using System.Collections;
+using System.Windows;
+using System.Windows.Controls;
+using Microsoft.Xaml.Behaviors;
+
+namespace DMS.WPF.Helper
+{
+    public class SelectedItemsBehavior : Behavior<DataGrid>
+    {
+        public static readonly DependencyProperty SelectedItemsProperty =
+            DependencyProperty.Register(nameof(SelectedItems), typeof(IList), typeof(SelectedItemsBehavior),
+                new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
+
+        public IList SelectedItems
+        {
+            get => (IList)GetValue(SelectedItemsProperty);
+            set => SetValue(SelectedItemsProperty, value);
+        }
+
+        protected override void OnAttached()
+        {
+            base.OnAttached();
+            AssociatedObject.SelectionChanged += OnSelectionChanged;
+        }
+
+        protected override void OnDetaching()
+        {
+            base.OnDetaching();
+            if (AssociatedObject != null)
+            {
+                AssociatedObject.SelectionChanged -= OnSelectionChanged;
+            }
+        }
+
+        private void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            if (sender is DataGrid dataGrid)
+            {
+                SelectedItems = dataGrid.SelectedItems;
+            }
+        }
+    }
+}