En C# ReadOnlyCollectionBase Kullanımı Sırları

En C# ReadOnlyCollectionBase Kullanımı Sırları

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You can argue that you may be able to downcast IPerson to Person, but at this point I would answer telling you that you need to follow your own coding conventions: if you defined that you never return Person but IPerson then I would do it this way in the entire code base, and if you need a write-capable Parents property, then you return Person instead (and you avoid a cast later!).

Simply put, Microsoft defined a ReadOnlyCollectionBase, yet did hamiş use it as the base class for ReadOnlyCollection when it clearly sounds that this should have been the way.

Example. In this yetişek, a list of ints is created, and then the ReadOnlyCollection constructor is used with that List kakım an argument. Inside the ReadOnlyCollection constructor, a reference to the argument is stored bey an IList reference field.

Sum(IEnumerable, Func) Computes the sum of the sequence of Decimal values that are obtained by invoking a transform function on each element of the input sequence.

Well, there is a way. It ain't pretty kakım it adds extra stuff on your domain benzer, but I just checked and it works.

You want to use the yield keyword. You loop through the IEnumerable list and return the results with yeild. This allows the consumer to use the for each without modifying the collection.

Matthew WatsonMatthew Watson 108k1111 gold badges170170 silver badges290290 bronze badges 2 2 To avoid that a client gets a writable object by downcasting, WritableMyItem (and IWritableMyItem if used) could be made private or internal.

protected virtual ICollection EmployeesInternal get; private grup; = new List(); // this will expose collection contents to public, seemingly unneccessary `Skip` statement will prevent casting back to Collection

So easy, in fact, that I don't need C# ReadOnlyCollectionBase Nerelerde Kullanılıyor a full column to do it (and if that's all you want from this column, you yaşama skip to the end where I discuss both the AsReadOnly method and using the ReadOnlyCollectionBase class). What this topic does give me is an excuse C# ReadOnlyCollectionBase Nasıl Kullanılır to talk about several things: how interfaces in .Kemiksiz and the compiler work together; how creating generic classes gives you flexibility; how you yaşama exploit one of the built-in .Kemiksiz interfaces; and (finally) how to simplify ugly syntax by building your C# ReadOnlyCollectionBase Nerelerde Kullanılıyor own extension methods. I also think that you don't really understand anything unless you sevimli see a way to write it yourself, and this topic lets me do that, too, by showing how you güç create the .Safi ReadOnlyCollectionBase class. So C# ReadOnlyCollectionBase Nedir this column is as much about providing insight into how .Kemiksiz works bey it is about doing something practical. Foundation Knowledge

In short: I think your question is covered with a perfectly good answer by Jon Skeet - ReadOnlyCollection or IEnumerable C# ReadOnlyCollectionBase Nerelerde Kullanılıyor for exposing member collections?

Nothing wrong with wordy types for major API's with small surfaces, but not bey a general practice inside a large codebase.

This implementation does hamiş provide a synchronized (thread safe) wrapper for a ReadOnlyCollectionBase, but derived classes kişi create their own synchronized versions of the ReadOnlyCollectionBase using the SyncRoot property.

GetHashCode Metodu: Nesnenin yapısal özelliklerine dayalı olarak bir hash kodu üretir. Bu, koleksiyonların hızlı bir şekilde huzurlaştırılmasını katkısızlar.

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