ArrayList: ArrayList klası, değişici boyutlu ve nesnelerin bir koleksiyonunu saklamak için kullanılır ve IEnumerator ile elemanlarına erişim sağlanabilir.
Many of the LINQ methods, including Where, use deferred execution. In this case you dirilik think of the IEnumerable bey a query, rather than the actual result grup.
The second example returns an IEnumerable that contains all the information needed to run the query later on.
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İlgili adres makale hatm sürecinde farkında olmaksızın sakimlıkla yazılmış olsa icap.
IEnumerator is a class that enumerates collections. A class that implements IEnumerable returns an IEnumerator. A class that implements IEnumerator has custom enumeration logic.
So the difference between IQueryable and IEnumerable is about where the filter logic is executed. One executes on the client side and the other executes on the database.
For small result sets this is likely to be a single trip, for large ones you're sending a request for more rows from the results, but it doesn't re-run C# IStructuralComparable Temel Özellikleri the entire query.
Where the execution of a query is going to be performed "in process", typically all that's required is the code (as code) to execute each part of C# IStructuralComparable nedir the query.
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?
This dirilik be very useful in certain circumstances, for instance in a massive database table you don't want to copy the entire thing into memory before you start processing the rows.
Generally, don't worry about what's actually in the IEnumerables, bey it will be completely different from your actual code. Only worry about the actual output when you iterate over it C# IStructuralComparable Temel Özellikleri :)
IQueryable is a very powerful feature that enables a variety of interesting deferred execution scenarios (like paging and composition based queries).
When declaring a method’s parameter types, you should 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 an interface such birli IEnumerable rather than using a strong C# IStructuralComparable KullanımıC# IStructuralComparable nedir data type such bey List or even a stronger interface type such birli ICollection or IList: