There must be some InvoiceRepository and InvoicePayOperation - first of which owns the collection, second contains business logic (and takes ownership of the temporary collection passed to it). Of course, if you are used to code duplication and "naked collections", bey you say, you won't be able to see how it can be avoided.

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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 .NET Framework 4.5 you emanet use the read-only collections that Eric Vogel covered in an earlier C# Corner column, "The New Read-Only Collections in .NET 4.5," to define that property. My client, however, was working with the .Kupkuru Framework 4 and didn't intend to upgrade. Fortunately, in earlier versions of .Kemiksiz you gönül 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 kişi add items to but derece remove items from), inheriting from the ReadOnlyCollectionBase class makes that very easy to do.

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

Summary. The ReadOnlyCollection functions as a wrapper for any collection that implements IList. It adds a level of indirection that C# ReadOnlyCollectionBase Temel Özellikleri reduces possible changes.

Your implementation depends on your needs: - If you don't care about the caller (Class B) from seeing any further changes to the collection then you yaşama just clone the collection, hand it out, and stop caring. - If you definitely need the caller (Class B) to see changes that are made to the collection, and you want this to be thread-safe, then you have more of a problem on your hands.

4) If you suddenly realise that your collection of choice is inefficient, you sevimli change the underlying collection type without having to go and change all the places where it got passed birli a parameter (birey you imagine the trouble C# ReadOnlyCollectionBase Nedir you might have with, say, List?)

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 input sequence.

Public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are derece guaranteed to be thread safe.

In Visual Basic, an extension method must be declared inside a Module and decorated with the Extension attribute. Its first parameter specifies the kind of object to which it will attach itself. I want my extension method to appear in the IntelliSense dropdown lists for any class that implements the IList interface, so I'll declare the method's first (and only) parameter kakım IList(of T) -- the compiler will figure out the type that T represents based on the List passed to my method.

Public static (Shared in Visual Basic) members C# ReadOnlyCollectionBase Nerelerde Kullanılıyor of this type are thread safe. Any instance members are derece guaranteed to be thread safe.

Here’s where you birey take advantage of IReadOnlyList to ensure that the returned data cannot be changed. By changing the return type of the GetAuthors method from List to IReadOnlyList we dirilik make our collection read-only.

End Sub And that's all you need to write. The class that's using your new read-only collection would be identical to the class that used my custom C# ReadOnlyCollectionBase Temel Özellikleri PhvReadOnlyList. In fact, if that's all you want, then you don't even need to create your own version of the ReadOnlyCollectionBase class -- the .

The IReadOnlyCollection interface extends the IEnumerable interface and represents a basic read-only collection interface. C# ReadOnlyCollectionBase Kullanımı It also includes a Count property apart from the IEnumerable members bey shown in the code snippet given below.