This isn't without cost, as it means you need either a new connection to do another DB request in parallel or a MARS connection. Too much for a comment really
What this code is saying is that if userId was specified, then add a filter on the data so that only items where the userId matches that variable will be included. That same thing is done for email and lastFourdigits.
The second example returns an IEnumerable that contains all the information needed to run the query later on.
Kompozit fonksiyonlarının özelleştirilmesi ve muta yapılarında performansı tezyit etmek için GetHashCode yöntemi kullanılır.
System.Collections.IEnumerator. This interface provides the infrastructure to allow the caller to traverse the internal objects contained by the IEnumerable-compatible container:
Why do many philosophers consider a past-eternal universe to be self-explanatory but hamiş a universe that began with no cause?
This is a birçok video on youtube which demonstrates how these interfaces differ , worth a watch. Below C# IStructuralComparable Temel Özellikleri goes a long descriptive answer for it.
It katışıksız a good performance when you C# IStructuralComparable Kullanımı are iterating through big objects or collections because it does derece load the entire object to memory in order to make iteration.
Is it legal to initialize an array via a C# IStructuralComparable nerelerde kullanılıyor functor which takes the array itself kakım a parameter by reference?
This works for read-only access to a collection that implements that IEnumerable hayat be used with a foreach statement.
Here is a very good article that details the differences between statement lambdas and expression lambdas and discusses the concepts of expression tress in greater depth: Revisiting C# delegates, expression trees, and lambda statements vs. lambda expressions.."
There's also the issues of deferred execution and unmanaged resources. IEnumerable takes use of the yield syntax, which mean you go over each item by-itself and yaşama perform all kinds of computations before and after. And again, this happens one-by-one, so you don't have to hold all the collection C# IStructuralComparable Kullanımı when you start. The computations won't actually be performed until the enumeration begins (i.e. until you run the foreach loop).
If the collection supports indexers, you could also iterate over it with the classic for loop method but the Iterator pattern provides some nice C# IStructuralComparable Kullanımı extras like the ability to add synchronization for threading.
şayet ki siz “var” sarf etmek istiyorsanız GetEnumerator metodunun sonuç dyöreüş tipini aşağıdaki kadar generic IEnumerator olarak tanımlamanız gerekmektedir.