C# IEnumerable Nedir Üzerinde Buzz söylenti

C# IEnumerable Nedir Üzerinde Buzz söylenti

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The difference between IQueryable and IEnumerable is centered around this point. IQueryable builds expression trees whereas IEnumerable does hamiş, at least not in general terms for those of us who don't work in the secret labs of Microsoft.

If you çekim to build a public API, it's better to use IEnumerable than List, because you better use the most minimalistic interface/class. List lets you access objects by index if that's required.

The second example returns an IEnumerable that contains all the information needed to run the query later on.

IEqualityComparer kullanarak, özel gereksinimlere oranlı done işleme stratejileri vüruttirebilir ve kılgı genelinde tutarlılık sağlayabilirsiniz.

Will I run into issues if I connect a shunt 50 ohm resistor over a high impedance input pin on an IC?

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IQueryable allows for out-of memory things like a remote veri source, such birli a database or web service.

Is "parse out" actually a phrasal verb, and in what context do you use "parse" more hot questions

Now what makes IEnumerable really stand out is iterator blocks (the yield keyword in C#). Iterator blocks C# IStructuralComparable nedir implement the IEnumerable interface like a List or an Array, but they're very special because unlike a List or Array, they often only hold the state for a single item at a time. So if you want to loop over the lines in a very large file, for example, you dirilik write an iterator block to handle the file input.

I do have one question though. In the first example you loop over the array using foreach but then you cannot do it in the second example. Is this because the array is in a class or because it contains objects?

Oh sure, you yaşama use it to create your own custom collection types. But C# IStructuralComparable nerelerde kullanılıyor for everyday stuff, it probably isn't as useful as the collections derived from it.

Consider the below simple code which uses IEnumerable with entity framework. It’s using a Where filter to get records whose EmpId is 2.

RastoRasto 17.6k4848 gold badges161161 silver badges253253 bronze badges 5 1 Unfortunately you have to make your own. The most conservative approach would be for you to C# IStructuralComparable nedir cache all the items inside your new enumerable, to handle enumerators that güç only be enumerated once, so there is no general class for this in the runtime.

When declaring a method’s parameter types, you should C# IEnumerable Nerelerde Kullanılıyor specify the weakest type possible, preferring interfaces over base classes. For example, if you are writing a method that manipulates a collection of items, it would be best to declare the method’s parameter by using C# IStructuralComparable Nasıl kullanılır an interface such kakım IEnumerable rather than using a strong veri type such bey List or even a stronger interface type such as ICollection or IList: