Fixed DatePicker's DateSelected event not firing on Windows - NET 10 Preview 6

src/Controls/tests/DeviceTests/Elements/DatePicker/DatePickerTests.cs

@@ -1,10 +1,10 @@
-using Microsoft.Maui.Controls;
+using System;
+using System.Threading.Tasks;
+using Microsoft.Maui.Controls;
 using Microsoft.Maui.Handlers;
 using Microsoft.Maui.Hosting;
-using System;
-using System.Threading.Tasks;
-using Xunit;
 using Microsoft.Maui.Platform;
+using Xunit;
 
 namespace Microsoft.Maui.DeviceTests;
 
@@ -98,4 +98,58 @@ string GetDisplayedText(DatePickerHandler handler)
 
 		return string.Empty;
 	}
+
+	[Fact(DisplayName = "DateSelected Event Fires When Platform View Date Changes")]
+	public async Task DateSelectedEventFiresWhenPlatformViewDateChanges()
+	{
+		SetupBuilder();
+
+		var originalDate = new DateTime(2023, 5, 15);
+		var newDate = new DateTime(2023, 8, 20);
+
+		var datePicker = new DatePicker
+		{
+			Date = originalDate
+		};
+
+		bool eventFired = false;
+
+		datePicker.DateSelected += (sender, e) =>
+		{
+			eventFired = true;
+		};
+
+		await CreateHandlerAndAddToWindow<DatePickerHandler>(datePicker, async (handler) =>
+		{
+			await InvokeOnMainThreadAsync(() =>
+			{
+#if ANDROID
+				if (handler.DatePickerDialog != null)
+				{
+					var previousDate = handler.VirtualView.Date;
+					handler.VirtualView.Date = newDate;
+				}
+#elif IOS
+                if (handler.DatePickerDialog != null)
+                {
+                    handler.DatePickerDialog.SetDate(newDate.ToNSDate(), false);
+                    typeof(DatePickerHandler).GetMethod("SetVirtualViewDate",
+                        System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance)?
+                        .Invoke(handler, null);
+                }
+#elif WINDOWS
+                if (handler.PlatformView != null)
+                {
+                    handler.PlatformView.Date = newDate;
+                }
+#else
+				handler.VirtualView.Date = newDate;
+#endif
+			});
+
+			await Task.Delay(20);
+
+			Assert.True(eventFired, "DateSelected event should fire when platform view date changes");
+		});
+	}
 }

src/Core/src/Handlers/DatePicker/DatePickerHandler.Windows.cs

@@ -62,7 +62,7 @@ internal static partial void MapIsOpen(IDatePickerHandler handler, IDatePicker d
 		handler.PlatformView?.UpdateIsOpen(datePicker);
 	}
 
-	private void DateChanged(CalendarDatePicker sender, CalendarDatePickerDateChangedEventArgs args)
+	void DateChanged(CalendarDatePicker sender, CalendarDatePickerDateChangedEventArgs args)
 	{
 		if (VirtualView is null)
 		{
@@ -75,7 +75,7 @@ private void DateChanged(CalendarDatePicker sender, CalendarDatePickerDateChange
 			return;
 		}
 
-		if (VirtualView.Date is null)
+		if (VirtualView.Date != args.NewDate.Value.DateTime)
 		{
 			VirtualView.Date = args.NewDate.Value.DateTime;
 		}