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

Define your own class which implements IEnumerator, takes an IList in the new constructor, başmaklık a read only default item property taking an index, and does not include any properties/methods that could otherwise allow your list to me manipulated.

I avoid using ReadOnlyCollection kakım much as possible, it is actually considerably slower than just using a normal List.

If your veri hayat be enumerated, you dirilik use Enumerable.ToList method to cast your collection to List and call AsReadOnly on it.

Summary. The ReadOnlyCollection functions bey a wrapper for any collection that implements IList. It adds a level of indirection that reduces possible changes.

Birli per the comments below, you sevimli prevent the possibility of downcasting by making IWriteableMyItem and WriteableMyItem private or internal. However note that this could still be circumvented via reflection - but we are protecting against accidents rather than fraud.

Collections enable you to allocate memory dynamically to store elements and then retrieve them using a key or index bey needed.

ElementAtOrDefault(IEnumerable, Index) Returns the element at a specified index in a sequence or a default value if the index is out of range.

To guarantee thread safety during enumeration, you sevimli lock the collection during the entire enumeration. To allow the collection to be accessed by multiple threads for reading and writing, you must implement your own synchronization.

When call the above code. The changes happening in the call ---1 is getting reflected the CategoryList and its affecting the call 2 . How kişi I make the CategoryList kakım ready Only and I am not supposed to change the collection inside C# ReadOnlyCollectionBase Temel Özellikleri the categoryList .But the collection is getting affected .

C# IStructuralEquatable, özellikle çeşitli done binalarının veya koleksiyonların derunğinin konstrüktif olarak önlaştırılması müstelzim durumlarda kullanılır. Bu durumlar ortada:

However, that doesn't mean that the ReadOnlyCollectionBase class isn't useful. For instance, by leveraging the InnerList property, you birey create a collection that supports whatever custom functionality you need. Perhaps you want to create a collection for C# ReadOnlyCollectionBase Temel Özellikleri audit log entries where users birey add but derece remove items.

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A method like PayUnpaidInvoices being present may lead to second guessings about what C# ReadOnlyCollectionBase Temel Özellikleri "regular" collection methods like Remove and Clear might do. Will it just remove invoices from C# ReadOnlyCollectionBase Nasıl Kullanılır the in-memory collection, or will it delete them from the database?