Don't return a collection directly. Make an accurately named business logic class that reflects the purpose of the collection.
Define your own class which implements IEnumerator, takes an IList in the new constructor, katışıksız a read only default item property taking an index, and does derece include any properties/methods that could otherwise allow your list to me manipulated.
Marc GravellMarc Gravell 1.0m271271 gold badges2.6k2.6k silver badges2.9k2.9k bronze badges 3 1 I would second here on using the readonly keyword for the variable as well. Without this, anyone might fall into an impression that since the collection is of type ReadOnlyCollection so I'm completely safe from any possibility of changes being done to my collection when it is hamiş the case.
This hides Add and Remove methods, but does not protect at all. Because I yaşama always cast to ICollection and call prohibited method.
Imagine we have existing biçim with Organization => Employees already grup up. To apply this technique, we need to change Organization paradigma a bit:
You kişi expose private collection properties to EF, allowing for mapping and querying, while still keeping your domain object's members and relationships properly encapsulated. It's a bit messy, but it works:
If your only intent is to get calling code to derece make a mistake, and modify the collection when it should only be C# ReadOnlyCollectionBase Nasıl Kullanılır reading all that is necessary is to return an interface which doesn't support Add, Remove, etc.
Nedeniyle hız istenirse Array, az hafıza kullanımı istenirse List yeğleme edilmelidir. şayet koleksiyona eklenicek tip belirli bileğilse ArrayList kullanılabilir. Fakat C# ReadOnlyCollectionBase Nasıl Kullanılır aynı teamüllevi generic listemizde alınlayabilme yetisine sahiptir.
Exposing the array directly to those using it means that they sevimli modify it - this is a violation of C# ReadOnlyCollectionBase Nedir encapsulation and veri hiding.
When call the above code. The changes happening in the call ---1 is getting reflected the CategoryList and its affecting the call 2 . How can I make the CategoryList as ready Only and I am hamiş supposed to change the collection inside the categoryList .But the collection is getting affected .
Now the error makes sense, it's true I do hamiş have a default constructor. However I am able to Serialize a ReadOnlyCollection using the DataContractSerializer even though ReadOnlyCollection does not have a parameterless default constructor.
C# Metot neden kullanılır? C# Metotlar, bir yetişek içinde tekrar yine kullanılması müstelzim şifre bloklarını gruplandırmak ve henüz sonrasında istimal etmek sinein kullanılır. Facebook Twitter Whatsapp Tumbler Pinterest
1 Also, in the provided case, the C# ReadOnlyCollectionBase Nerelerde Kullanılıyor best center of knowledge on whether the invoice sevimli be paid is the invoice itself, so it must have a property CanBePaid - so, a bit of cleverness eliminates the need to change "in 4 places"
A method like PayUnpaidInvoices being present may lead to second guessings about what "regular" collection methods like Remove and Clear might do. Will it just remove invoices from the in-memory collection, or will it C# ReadOnlyCollectionBase Kullanımı delete them from the database?