Değil Hakkında Detaylar bilinen C# ReadOnlyCollectionBase Temel Özellikleri

Değil Hakkında Detaylar bilinen C# ReadOnlyCollectionBase Temel Özellikleri

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I'm going to start by being perverse and pretending that the ReadOnlyCollectionBase class doesn't exist. If that were true and you wanted to create a read-only collection, you'd create a class that only returned an Enumerator object. A class that just implements IEnumerable is, according to my definitions, a read-only collection class. Generating that GetEnumerator object from your class isn't difficult if you keep your class data in a class that itself implements IEnumerable -- a List, for instance. If you do keep your data in a List, then you dirilik use the List GetEnumerator method to retrieve an Enumerator object, which you yaşama then return to the yetişek using your class. Listing 1 özgü the basics of this class (I've called it PhvReadOnlyList).

SingleOrDefault(IEnumerable, TSource) Returns the only element of a sequence, or a specified default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.

I ran a security code analyst i found myself having a CA2105 warning. I looked at the grade tampering example. I didn't realize you gönül assign int[] to a readonly int. I thought readonly was like the C++ const and makes it illegal.

Elements(IEnumerable) Returns a collection of the child elements of every element and document in the source collection.

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.

Is there any reason to expose an internal collection bey a ReadOnlyCollection rather than an IEnumerable if the calling code only iterates over the collection?

A ReadOnlyCollection hayat support multiple readers concurrently, bey long as the collection is hamiş modified. Even so, enumerating through a collection is intrinsically derece a thread-safe procedure.

Kodunuzda aynı mesleklemi takkadak şu denli defa kullanmanız gerekiyorsa, bu teamüllemi bir metot mideine koyabilirsiniz ve yine yine aynı kodu C# ReadOnlyCollectionBase Temel Özellikleri yazmanız gerekmez. Bu sayede kodunuz elan az karmaşık hale gelir ve daha kolayca yönetilebilir.

Dan TaoDan Tao 128k5656 gold badges308308 silver badges448448 bronze badges C# ReadOnlyCollectionBase Kullanımı 4 I'd like to avoid noise in both callee and caller. Exposing a ReadOnlyCollection bey anything other than itself isn't necessary: after all, exposing it kakım an IList just gets confusing (where'd I get this IList from - sevimli I modify it?), and any IList is exposable C# ReadOnlyCollectionBase Temel Özellikleri kakım ReadOnlyCollection so there's no loss of generality.

So when i have this piece of code what is the easiest or best way to make it a read only collection?

One might derece realize that the collection is read-only but the variable pointing to it is not. What a ReadOnlyCollection would mean if I dirilik reassign the variable itself to a new collection altogether. +1.

Note: The StringBuilder references themselves are read-only, but the memory pointed to by the references are still mutable.

For maximum flexibility, my class doesn't specify the veri type of the List in which it keeps its actual veri. Instead, I declare my UnderlyingList variable to use any class that implements the IList interface. C# ReadOnlyCollectionBase Nedir I've also made this a generic class: Rather than specify what kind of List I'm working with, I've forced my class to be instantiated with a data type that the code refers to as T. Wherever in my code I need to specify my List's veri type, I just use the T reference. Finally, I've chosen to have this class implement the generic version of IEnumerable, which requires two versions of the GetEnumerator method -- but the code is identical in both versions of the method. Listing 1. The basics of the C# ReadOnlyCollectionBase Temel Özellikleri PhvReadOnlyList class.

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