Merge pull request #84 from danheron/fix/check-end-date

Check that end date of calendar item is valid

Heron.MudCalendar.UnitTests.Viewer/TestComponents/Calendar/CalendarInvalidEndDateTest.razor

@@ -0,0 +1,16 @@
+<MudCalendar Items="_events" Height="500"/>
+
+@code {
+    public static string __description__ = "Calendar Invalid End Date Tests";
+
+    private List<CalendarItem> _events = new()
+    {
+        new CalendarItem
+        {
+            Start = DateTime.Today.AddHours(10),
+            End = DateTime.Today.AddHours(10),
+            Text = "Event 1"
+        }
+    };
+
+}

Heron.MudCalendar/Base/DayWeekViewBase.razor.cs

@@ -233,6 +233,12 @@ private static IEnumerable<ItemPosition> CalcPositions(IEnumerable<CalendarItem>
         var overlaps = new List<ItemPosition>();
         foreach (var item in items)
         {
+            // Check that the end date is valid
+            if (item.End.HasValue && item.End <= item.Start)
+            {
+                throw new ApplicationException("End date of calendar item must be after start date");
+            }
+
             overlaps.RemoveAll(o => (o.Item.End ?? o.Item.Start.AddHours(1)) <= item.Start);
 
             // Create new position object