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src/AppCommon/FileTime.App.Core/Extensions/ObservableExtensions.cs

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+using System.Reactive.Linq;
+
+namespace FileTime.App.Core.Extensions
+{
+    public static class ObservableExtensions
+    {
+        public static IObservable<T> WhereNotNull<T>(this IObservable<T?> source) => source.Where(c => c != null)!;
+    }
+}