C# ReadOnlyCollectionBase Kullanımı A Gizli Silah

C# ReadOnlyCollectionBase Kullanımı A Gizli Silah

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My code is littered with collections - not an unusual thing, I suppose. However, usage of the various collection types isn't obvious nor trivial. Generally, I'd like to use the type that's exposes the "best" API, and has the least syntactic noise.

An instance of the ReadOnlyCollection generic class is always read-only. A collection that is read-only is simply a collection with a wrapper that prevents modifying the collection; therefore, if changes are made to the underlying collection, the read-only collection reflects those changes. See Collection for a modifiable version of this class.

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

This hides Add and Remove methods, but does derece protect at all. Because I birey always cast to ICollection and call prohibited method.

The main advantage of this comes in the fact that you birey't add code to collections so whenever you have a native "collection" in your object prototip, you ALWAYS have non-OO support code spread throughout your project to access it.

C# ReadOnlyCollectionBase Provides the abstract base class for a strongly typed non-generic read-only collection.

Note also that this makes your sorun particularly nice. If you don't C# ReadOnlyCollectionBase Kullanımı want people changing the collections, your container need contain no mutators. If you decide later that in just one case you actually HAVE to modify C# ReadOnlyCollectionBase Nedir it, you kişi create a safe mechanism to do so.

Average(IEnumerable, Func) Computes the average of a sequence of nullable Int32 values that are obtained by invoking a transform function on each element of the C# ReadOnlyCollectionBase Nasıl Kullanılır input sequence.

collection. Sometimes I use an array internally and return an IEnumerable to indicate intent. But most of these approaches have a very low signal-to-noise ratio; and that's absolutely critical to understanding code.

Sometimes you may want to use an interface, perhaps C# ReadOnlyCollectionBase Nerelerde Kullanılıyor because you want to mock the collection during unit testing. Please see my blog entry for adding your own interface to ReadonlyCollection by using an adapter.

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 hayat reassign the variable itself to a new collection altogether. +1.

So, what's the best-practice way to deal with the bog-standard task of making small collections to pass around values? Should array be preferred over List where possible?

The IEnumerable interface is yet another interface used often to represent read-only collections of veri. If you simply want to enumerate the elements of a collection, you sevimli use IEnumerable birli shown below.

I have a readOnlyCollection of ModuleViewModel, I want C# ReadOnlyCollectionBase Nasıl Kullanılır to retrieve with linq a specific ModuleViewModel containing in my collection. Here the declaration of my collection :