IObservableList items as IReadOnlyList

src/DynamicData.Tests/API/ApiApprovalTests.DynamicDataTests.DotNet8_0.verified.txt

@@ -890,7 +890,7 @@ namespace DynamicData
     {
         int Count { get; }
         System.IObservable<int> CountChanged { get; }
-        System.Collections.Generic.IEnumerable<T> Items { get; }
+        System.Collections.Generic.IReadOnlyList<T> Items { get; }
         System.IObservable<DynamicData.IChangeSet<T>> Connect(System.Func<T, bool>? predicate = null);
         System.IObservable<DynamicData.IChangeSet<T>> Preview(System.Func<T, bool>? predicate = null);
     }
@@ -2642,7 +2642,7 @@ namespace DynamicData
         public SourceList(System.IObservable<DynamicData.IChangeSet<T>>? source = null) { }
         public int Count { get; }
         public System.IObservable<int> CountChanged { get; }
-        public System.Collections.Generic.IEnumerable<T> Items { get; }
+        public System.Collections.Generic.IReadOnlyList<T> Items { get; }
         public System.IObservable<DynamicData.IChangeSet<T>> Connect(System.Func<T, bool>? predicate = null) { }
         public void Dispose() { }
         public void Edit(System.Action<DynamicData.IExtendedList<T>> updateAction) { }

src/DynamicData.Tests/Binding/AvaloniaDictionaryFixture.cs

@@ -35,7 +35,7 @@ public void Add()
 
         _results.Messages.Count.Should().Be(1);
         _results.Data.Count.Should().Be(1);
-        _results.Data.Items.First().Should().Be(person);
+        _results.Data.Items[0].Should().Be(person);
     }
 
     [Fact]
@@ -48,7 +48,7 @@ public void Replace()
         _collection["Someone"] = person2;
 
         _results.Data.Count.Should().Be(1);
-        _results.Data.Items.First().Should().Be(person2);
+        _results.Data.Items[0].Should().Be(person2);
     }
 
 

src/DynamicData.Tests/Binding/BindingListToChangeSetFixture.cs

@@ -29,7 +29,7 @@ public void Add()
 
         _results.Messages.Count.Should().Be(1);
         _results.Data.Count.Should().Be(1);
-        _results.Data.Items.First().Should().Be(1);
+        _results.Data.Items[0].Should().Be(1);
     }
 
     public void Dispose() => _results.Dispose();

src/DynamicData.Tests/Binding/IObservableListBindCacheFixture.cs

@@ -37,7 +37,7 @@ public void AddToSourceAddsToDestination()
         _source.AddOrUpdate(person);
 
         _list.Count.Should().Be(1, "Should be 1 item in the collection");
-        _list.Items.First().Should().Be(person, "Should be same person");
+        _list.Items[0].Should().Be(person, "Should be same person");
     }
 
     [Fact]
@@ -97,6 +97,6 @@ public void UpdateToSourceUpdatesTheDestination()
         _source.AddOrUpdate(personUpdated);
 
         _list.Count.Should().Be(1, "Should be 1 item in the collection");
-        _list.Items.First().Should().Be(personUpdated, "Should be updated person");
+        _list.Items[0].Should().Be(personUpdated, "Should be updated person");
     }
 }

src/DynamicData.Tests/Binding/IObservableListBindCacheSortedFixture.cs

@@ -45,7 +45,7 @@ public void AddToSourceAddsToDestination()
         _source.AddOrUpdate(person);
 
         _list.Count.Should().Be(1, "Should be 1 item in the collection");
-        _list.Items.First().Should().Be(person, "Should be same person");
+        _list.Items[0].Should().Be(person, "Should be same person");
     }
 
     [Fact]

src/DynamicData.Tests/Binding/IObservableListBindListFixture.cs

@@ -141,7 +141,7 @@ public void AddToSourceAddsToDestination()
         _source.Add(person);
 
         _list.Count.Should().Be(1, "Should be 1 item in the collection");
-        _list.Items.First().Should().Be(person, "Should be same person");
+        _list.Items[0].Should().Be(person, "Should be same person");
     }
 
     [Fact]
@@ -191,6 +191,6 @@ public void UpdateToSourceUpdatesTheDestination()
         _source.Replace(person, personUpdated);
 
         _list.Count.Should().Be(1, "Should be 1 item in the collection");
-        _list.Items.First().Should().Be(personUpdated, "Should be updated person");
+        _list.Items[0].Should().Be(personUpdated, "Should be updated person");
     }
 }

src/DynamicData.Tests/Binding/ObservableCollectionExtendedToChangeSetFixture.cs

@@ -32,7 +32,7 @@ public void Add()
 
         _results.Messages.Count.Should().Be(1);
         _results.Data.Count.Should().Be(1);
-        _results.Data.Items.First().Should().Be(1);
+        _results.Data.Items[0].Should().Be(1);
     }
 
     public void Dispose() => _results.Dispose();

src/DynamicData.Tests/Binding/ObservableCollectionToChangeSetFixture.cs

@@ -30,7 +30,7 @@ public void Add()
 
         _results.Messages.Count.Should().Be(1);
         _results.Data.Count.Should().Be(1);
-        _results.Data.Items.First().Should().Be(1);
+        _results.Data.Items[0].Should().Be(1);
     }
 
     public void Dispose() => _results.Dispose();

src/DynamicData.Tests/Binding/ReadOnlyObservableCollectionToChangeSetFixture.cs

@@ -33,7 +33,7 @@ public void Add()
 
         _results.Messages.Count.Should().Be(1);
         _results.Data.Count.Should().Be(1);
-        _results.Data.Items.First().Should().Be(1);
+        _results.Data.Items[0].Should().Be(1);
     }
 
     public void Dispose() => _results.Dispose();

src/DynamicData.Tests/Cache/MergeManyChangeSetsListFixture.cs

@@ -270,7 +270,7 @@ public void ResultContainsChildrenAddedWithInsert()
     {
         // Arrange
         var randomOwner = _randomizer.ListItem(_animalOwners.Items.ToList());
-        var insertIndex = _randomizer.Number(randomOwner.Animals.Items.Count());
+        var insertIndex = _randomizer.Number(randomOwner.Animals.Items.Count);
         var insertThis = _animalFaker.Generate();
         var initialCount = _animalOwners.Items.Sum(owner => owner.Animals.Count);
 

src/DynamicData.Tests/Cache/TransformManyAsyncFixture.cs

@@ -273,7 +273,7 @@ private static Func<AnimalOwner, Guid, Task<IObservableCache<Animal, int>>> Sele
         CreateSelector(static owner => owner.ObservableCache, delayFactory);
 
     private static Func<AnimalOwner, Guid, Task<IEnumerable<Animal>>> SelectEnumerable(Func<Task>? delayFactory = null) =>
-        CreateSelector(static owner => owner.Animals.Items, delayFactory);
+        CreateSelector(static owner => owner.Animals.Items.AsEnumerable(), delayFactory);
 
     private static Func<AnimalOwner, Guid, Task<T>> CreateSelector<T>(Func<AnimalOwner, T> selector, Func<Task>? delayFactory = null) =>
         (delayFactory != null)

src/DynamicData.Tests/EnumerableIListFixture.cs

@@ -19,7 +19,7 @@ public void EnumerableIListTests()
             rng.NextBytes(data);
 
             var inputData = new byte[39];
-            var lastItem = data[data.Length - 1];
+            var lastItem = data[^1];
             var firstItem = data[0];
             Array.Copy(data, 1, inputData, 0, 38);
             var listOfRandomFloats = new List<byte>(inputData);

src/DynamicData.Tests/List/AutoRefreshFixture.cs

@@ -176,9 +176,9 @@ void CheckContent()
         //change the value and move to a grouping which does not yet exist
         items[1].Age = -1;
         results.Data.Count.Should().Be(11);
-        results.Data.Items.Last().GroupKey.Should().Be(-1);
-        results.Data.Items.Last().List.Count.Should().Be(1);
-        results.Data.Items.First().List.Count.Should().Be(9);
+        results.Data.Items[^1].GroupKey.Should().Be(-1);
+        results.Data.Items[^1].List.Count.Should().Be(1);
+        results.Data.Items[0].List.Count.Should().Be(9);
         CheckContent();
 
         //put the value back where it was and check the group was removed
@@ -230,9 +230,9 @@ void CheckContent()
         //change the value and move to a grouping which does not yet exist
         items[1].Age = -1;
         results.Data.Count.Should().Be(11);
-        results.Data.Items.Last().Key.Should().Be(-1);
-        results.Data.Items.Last().Count.Should().Be(1);
-        results.Data.Items.First().Count.Should().Be(9);
+        results.Data.Items[^1].Key.Should().Be(-1);
+        results.Data.Items[^1].Count.Should().Be(1);
+        results.Data.Items[0].Count.Should().Be(9);
         CheckContent();
 
         //put the value back where it was and check the group was removed
@@ -354,7 +354,7 @@ public void RefreshTransformAsList()
         var obj = new Example { Value = 0 };
         list.Add(obj);
         obj.Value = 1;
-        valueList.Items.First().Should().Be(1);
+        valueList.Items[0].Should().Be(1);
     }
 
     private class Example : AbstractNotifyPropertyChanged

src/DynamicData.Tests/List/DisposeManyFixture.cs

@@ -96,7 +96,7 @@ public void ItemsAreDisposedAfterRemovalOrReplacement()
         _itemsSource.AddRange(items[7..10]);
         _changeSetsSource.OnNext(new ChangeSet<DisposableObject>() // Refresh
         {
-            new(ListChangeReason.Refresh, current: _itemsSource.Items.First(), index: 0)
+            new(ListChangeReason.Refresh, current: _itemsSource.Items[0], index: 0)
         });
 
         _results.Exception.Should().BeNull();

src/DynamicData.Tests/List/DistinctValuesFixture.cs

@@ -58,7 +58,7 @@ public void DuplicatedResultsResultInNoAdditionalMessage()
 
         _results.Messages.Count.Should().Be(1, "Should be 1 update message");
         _results.Data.Count.Should().Be(1, "Should be 1 items in the cache");
-        _results.Data.Items.First().Should().Be(20, "Should 20");
+        _results.Data.Items[0].Should().Be(20, "Should 20");
     }
 
     [Fact]
@@ -68,7 +68,7 @@ public void FiresAddWhenaNewItemIsAdded()
 
         _results.Messages.Count.Should().Be(1, "Should be 1 updates");
         _results.Data.Count.Should().Be(1, "Should be 1 item in the cache");
-        _results.Data.Items.First().Should().Be(20, "Should 20");
+        _results.Data.Items[0].Should().Be(20, "Should 20");
     }
 
     [Fact]
@@ -86,7 +86,7 @@ public void FiresBatchResultOnce()
         _results.Data.Count.Should().Be(3, "Should be 3 items in the cache");
 
         _results.Data.Items.Should().BeEquivalentTo(new[] { 20, 21, 22 });
-        _results.Data.Items.First().Should().Be(20, "Should 20");
+        _results.Data.Items[0].Should().Be(20, "Should 20");
     }
 
     [Fact]

src/DynamicData.Tests/List/DynamicOrFixture.cs

@@ -26,7 +26,7 @@ public void RefreshPassesThrough()
         results.Data.Count.Should().Be(2);
         results.Messages.Count.Should().Be(3);
         results.Messages[2].Refreshes.Should().Be(1);
-        results.Messages[2].First().Item.Current.Should().Be(source1.Items.First());
+        results.Messages[2].First().Item.Current.Should().Be(source1.Items[0]);
     }
 }
 
@@ -126,7 +126,7 @@ public void IncludedWhenItemIsInOneSource()
         _source1.Add(1);
 
         _results.Data.Count.Should().Be(1);
-        _results.Data.Items.First().Should().Be(1);
+        _results.Data.Items[0].Should().Be(1);
     }
 
     [Fact]
@@ -137,7 +137,7 @@ public void IncludedWhenItemIsInTwoSources()
         _source1.Add(1);
         _source2.Add(1);
         _results.Data.Count.Should().Be(1);
-        _results.Data.Items.First().Should().Be(1);
+        _results.Data.Items[0].Should().Be(1);
     }
 
     [Fact]

src/DynamicData.Tests/List/DynamicXOrFixture.cs

@@ -94,7 +94,7 @@ public void IncludedWhenItemIsInOneSource()
         _source1.Add(1);
 
         _results.Data.Count.Should().Be(1);
-        _results.Data.Items.First().Should().Be(1);
+        _results.Data.Items[0].Should().Be(1);
     }
 
     [Fact]

src/DynamicData.Tests/List/FilterControllerFixtureWithClearAndReplace.cs

@@ -35,7 +35,7 @@ public void AddMatched()
 
         _results.Messages.Count.Should().Be(1, "Should be 1 updates");
         _results.Data.Count.Should().Be(1, "Should be 1 item in the cache");
-        _results.Data.Items.First().Should().Be(person, "Should be same person");
+        _results.Data.Items[0].Should().Be(person, "Should be same person");
     }
 
     [Fact]
@@ -64,7 +64,7 @@ public void AddNotMatchedAndUpdateMatched()
 
         _results.Messages.Count.Should().Be(1, "Should be 1 updates");
         _results.Messages[0].First().Range.First().Should().Be(matched, "Should be same person");
-        _results.Data.Items.First().Should().Be(matched, "Should be same person");
+        _results.Data.Items[0].Should().Be(matched, "Should be same person");
     }
 
     [Fact]

src/DynamicData.Tests/List/FilterControllerFixtureWithDiffSet.cs

@@ -35,7 +35,7 @@ public void AddMatched()
 
         _results.Messages.Count.Should().Be(1, "Should be 1 updates");
         _results.Data.Count.Should().Be(1, "Should be 1 item in the cache");
-        _results.Data.Items.First().Should().Be(person, "Should be same person");
+        _results.Data.Items[0].Should().Be(person, "Should be same person");
     }
 
     [Fact]
@@ -64,7 +64,7 @@ public void AddNotMatchedAndUpdateMatched()
 
         _results.Messages.Count.Should().Be(1, "Should be 1 updates");
         _results.Messages[0].First().Range.First().Should().Be(matched, "Should be same person");
-        _results.Data.Items.First().Should().Be(matched, "Should be same person");
+        _results.Data.Items[0].Should().Be(matched, "Should be same person");
     }
 
     [Fact]

src/DynamicData.Tests/List/FilterFixture.cs

@@ -29,7 +29,7 @@ public void AddMatched()
 
         _results.Messages.Count.Should().Be(1, "Should be 1 updates");
         _results.Data.Count.Should().Be(1, "Should be 1 item in the cache");
-        _results.Data.Items.First().Should().Be(person, "Should be same person");
+        _results.Data.Items[0].Should().Be(person, "Should be same person");
     }
 
     [Fact]
@@ -58,7 +58,7 @@ public void AddNotMatchedAndUpdateMatched()
 
         _results.Messages.Count.Should().Be(1, "Should be 1 updates");
         _results.Messages[0].First().Range.First().Should().Be(matched, "Should be same person");
-        _results.Data.Items.First().Should().Be(matched, "Should be same person");
+        _results.Data.Items[0].Should().Be(matched, "Should be same person");
     }
 
     [Fact]

src/DynamicData.Tests/List/FilterWithObservable.cs

@@ -37,7 +37,7 @@ public void AddMatched()
 
         _results.Messages.Count.Should().Be(1, "Should be 1 updates");
         _results.Data.Count.Should().Be(1, "Should be 1 item in the cache");
-        _results.Data.Items.First().Should().Be(person, "Should be same person");
+        _results.Data.Items[0].Should().Be(person, "Should be same person");
     }
 
     [Fact]
@@ -66,7 +66,7 @@ public void AddNotMatchedAndUpdateMatched()
 
         _results.Messages.Count.Should().Be(1, "Should be 1 updates");
         _results.Messages[0].First().Range.First().Should().Be(matched, "Should be same person");
-        _results.Data.Items.First().Should().Be(matched, "Should be same person");
+        _results.Data.Items[0].Should().Be(matched, "Should be same person");
     }
 
     [Fact]

src/DynamicData.Tests/List/GroupImmutableFixture.cs

@@ -104,7 +104,7 @@ public void FiresOnlyOnceForABatchOfUniqueValues()
 
         _results.Messages.Count.Should().Be(1);
         _results.Messages.First().Adds.Should().Be(1);
-        _results.Data.Items.First().Count.Should().Be(4);
+        _results.Data.Items[0].Count.Should().Be(4);
     }
 
     [Fact]
@@ -162,7 +162,7 @@ public void UpdateAnItemWillChangedThegroup()
         _results.Messages.First().Adds.Should().Be(1);
         _results.Messages.Skip(1).First().Adds.Should().Be(1);
         _results.Messages.Skip(1).First().Removes.Should().Be(1);
-        var group = _results.Data.Items.First();
+        var group = _results.Data.Items[0];
         group.Count.Should().Be(1);
 
         group.Key.Should().Be(21);
@@ -178,7 +178,7 @@ public void UpdatesArePermissible()
         _results.Messages.First().Adds.Should().Be(1);
         _results.Messages.Skip(1).First().Replaced.Should().Be(1);
 
-        var group = _results.Data.Items.First();
+        var group = _results.Data.Items[0];
         group.Count.Should().Be(2);
     }
 }

src/DynamicData.Tests/List/GroupOnFixture.cs

@@ -30,7 +30,7 @@ public void Add()
         _results.Messages.Count.Should().Be(1, "Should be 1 updates");
         _results.Data.Count.Should().Be(1, "Should be 1 item in the cache");
 
-        var firstGroup = _results.Data.Items.First().List.Items.ToArray();
+        var firstGroup = _results.Data.Items[0].List.Items.ToArray();
         firstGroup[0].Should().Be(person, "Should be same person");
     }
 
@@ -71,7 +71,7 @@ public void UpdateWillChangeTheGroup()
         _results.Messages.Count.Should().Be(2, "Should be 2 updates");
         _results.Data.Count.Should().Be(1, "Should be 1 item in the cache");
 
-        var firstGroup = _results.Data.Items.First().List.Items.ToArray();
+        var firstGroup = _results.Data.Items[0].List.Items.ToArray();
         firstGroup[0].Should().Be(amended, "Should be same person");
     }
 }

src/DynamicData.Tests/List/GroupOnPropertyFixture.cs

@@ -29,7 +29,7 @@ public void CanGroupOnAdds()
 
         _results.Data.Count.Should().Be(1);
 
-        var firstGroup = _results.Data.Items.First();
+        var firstGroup = _results.Data.Items[0];
 
         firstGroup.Count.Should().Be(1);
         firstGroup.Key.Should().Be(10);
@@ -93,7 +93,7 @@ public void Regroup()
         person.Age = 20;
 
         _results.Data.Count.Should().Be(1);
-        var firstGroup = _results.Data.Items.First();
+        var firstGroup = _results.Data.Items[0];
 
         firstGroup.Count.Should().Be(1);
         firstGroup.Key.Should().Be(20);