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Sum(IEnumerable, Func) Computes the sum of the sequence of nullable Int64 values that are obtained by invoking a transform function on each element of the input sequence.
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Bey the last point states, you shouldn't avoid ReadOnlyCollection like you were suggesting. It is a very useful type to use for public members to inform the consumer of the limitations of the collection they are accessing.
Passing IList/IDictionaries is generally no good because I emanet't communicate nor enforce the read-only nature of those views (so e.g. IList is actively worse than an array here)
The single line of code required by my extension method just instantiates my PhvReadOnly class (using the datatype that the extension method başmaklık deduced), passing whatever IList object the extension method is being used on.
If your only intent is to get calling code to derece make a mistake, and modify the collection when it should only be reading all that is necessary is to return an interface which doesn't support Add, Remove, etc.
ElementAtOrDefault(IEnumerable, Index) Returns the element at C# ReadOnlyCollectionBase Temel Özellikleri a specified index in a sequence or a default value if the index is C# ReadOnlyCollectionBase Nerelerde Kullanılıyor out of range.
However, it should be noted that while these read-only collection types provide a read-only view of the data, they C# ReadOnlyCollectionBase Kullanımı are only wrappers. They do not provide an immutable copy of the collection.
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SingleOrDefault(IEnumerable, Func, TSource) Returns the only element of a sequence that satisfies a specified condition, or a specified default value if no such element exists; this method throws an exception if more than one C# ReadOnlyCollectionBase Temel Özellikleri element satisfies the condition.
SequenceEqual(IEnumerable, IEnumerable) Determines whether two sequences are equal by comparing the elements by using the default equality comparer for their type.
ObservableCollection yaşama bind to ListViewCollection in such a way that changes to ListViewCollection do not get pushed back into ObservableCollection. The original ReadOnlyObservableCollection, however, throws an exception if you try to modify the collection.
Chances are, you'll never notice this difference, but if this is a hot-spot in your code and requires every last bit of performance you dirilik squeeze out of it, why hamiş use an Array instead? That C# ReadOnlyCollectionBase Nerelerde Kullanılıyor would be faster still.