En C# ReadOnlyCollectionBase Kullanımı Sırları

En C# ReadOnlyCollectionBase Kullanımı Sırları

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Best practice to create typed collections/lists with internal or private Add, Remove functionality? 2

IEnumerable saf been used to represent a read-only collection of data since the earliest versions of .Safi. The read-only collection interfaces available in .Safi Core and .Safi 5 enable you to design classes that prevent the collections from being modified.

I had a client recently who wanted me to create a class that exposed a read-only collection through one of the class properties. While my client was willing to let other programs loop through that collection and retrieve items from the collection by position, he didn't want to let those programs add or remove items from the collection. In the Microsoft .Kemiksiz Framework 4.5 you hayat use the read-only collections that Eric Vogel covered in an earlier C# Corner column, "The New Read-Only Collections in .Kemiksiz 4.5," to define that property. My client, however, was working with the .Kupkuru Framework 4 and didn't intend to upgrade. Fortunately, in earlier versions of .Kemiksiz you sevimli also create a read-only class from an existing List just by calling your List's AsReadOnly method. However, if you need something special (a List that users güç add items to but hamiş remove items from), inheriting from the ReadOnlyCollectionBase class makes that very easy to do.

Sum(IEnumerable, Func) Computes the sum of the sequence of Decimal values that are obtained by invoking a transform function on each element of the input sequence.

Ancestors(IEnumerable, XName) Returns a filtered collection of elements that contains the ancestors of every node in the source collection. Only elements that have a matching XName are included in the collection.

Note The StringBuilder references themselves are read-only, but the memory pointed to by C# ReadOnlyCollectionBase Temel Özellikleri the references are still mutable.

Thous leads that your consumer classes are just awaiting interfaces instead of concrete classes and so you sevimli change the concrete implementation at a later stage without breaking your public contract (due to performance reasons use an List instead of a LinkedList or vice versa).

In my example I exposed it all, but you don't C# ReadOnlyCollectionBase Temel Özellikleri have to do this. You emanet make it read-only if you want, or validate additions to the list, prior to adding them.

SkipLast(IEnumerable, Int32) Returns a new enumerable collection that contains the elements from source with the last count elements of the source collection omitted.

Elements(IEnumerable, XName) Returns a filtered collection of the child elements of every element and document in the source collection. Only elements that have a matching C# ReadOnlyCollectionBase Nerelerde Kullanılıyor XName are included in the collection.

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Inheriting from a non-generic base class would be ineffecient. If the type was C# ReadOnlyCollectionBase Temel Özellikleri using a non-generic base, all it would be would be a thin layer above the base collection, where the generic features would simply derive from casting from the underlying object instances of the base collection.

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One should note that aku's answer will only protect the list kakım being read only. Elements in the list are still very writable.