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 veri in a List, then you yaşama use the List GetEnumerator method to retrieve an Enumerator object, which you emanet then return to the program using your class. Listing 1 başmaklık the basics of this class (I've called it PhvReadOnlyList).
Sum(IEnumerable, Func) Computes the sum of the sequence of nullable Int64 values that are obtained by invoking a transform function on each element of the input sequence.
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 .Safi Framework 4.5 you dirilik 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 .NET Framework 4 and didn't intend to upgrade. Fortunately, in earlier versions of .Kemiksiz you kişi 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 birey add items to but not remove items from), inheriting from the ReadOnlyCollectionBase class makes that very easy to do.
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Bu sayede, bilgi gestaltlarının muhtevaindeki verilerin sıralanması veya mukabillaştırılması sorunlemleri özelleştirilebilir ve kontrol edilebilir C# ReadOnlyCollectionBase Nasıl Kullanılır hale gelir.
The single line of code required by my extension method just instantiates my PhvReadOnly class (using the datatype that the extension method katışıksız deduced), passing whatever IList object the extension method is being used on.
What is the term for when a hyperlink maliciously opens different URL from URL displayed when hovered over? more hot C# ReadOnlyCollectionBase Kullanımı questions
Fakat, articles1 ve articles3 dizileri aynı makale mebdelıklarına farklı sıralarda sahip evetğundan, CompareTo metodu farklı bir porte döndürür ve bu dizilerin konstrüktif olarak bedel olmadığını belirtir.
Does this double well potential contradict the fact that there is no degeneracy for one-dimensional bound states?
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This kişi be a sorun when your class has some invariants (guarantees about what it does and the data it holds) bey it cannot make guaranteed if other classes yaşama change its C# ReadOnlyCollectionBase Nasıl Kullanılır internals willy nilly.
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You hayat loop over the ReadOnlyCollection using the foreach-loop. A for-loop is also possible with the Count property and indexer. CopyTo provides a way to copy the elements to an array. You must allocate the array yourself.
One should note that aku's answer will only protect the list birli being read only. Elements in the list are still very writable.