This isn't without cost, birli it means you need either a new connection to do another DB request in parallel or a Merih connection. Too much for a comment really
I noticed that if I use IEnumerable, when I debug and inspect "yığın", which in that case is the IEnumerable, it has some interesting members: "inner", "outer", "innerKeySelector" and "outerKeySelector", these last 2 appear to be delegates.
The second method allows only List objects to be passed in; it will not accept an array or a String object. Obviously, the first method is better because it is much more flexible and sevimli be used in a much wider range of scenarios.
The following code example demonstrates the best practice for iterating a custom collection by implementing the IEnumerable and IEnumerator interfaces. In this example, members of these interfaces are not explicitly called, but they are implemented to support the use of foreach (For Each in Visual Basic) to iterate through the collection.
I have writen about custom IEnumerator. Whats the simplest way to make IEnumerable from it ? Mefkûre solution (one line of code) would be if there was some class for that purpose. Or C# IEnumerable Kullanımı do I have to create my own ?
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// but this throws an exception, because the pointer or link to the // database namely the DbContext called MyEntities no longer exists.
For small result C# IEnumerable Nedir sets this is likely to be a single trip, for large ones you're sending a request for more rows from the results, but C# IEnumerable Temel Özellikleri it doesn't re-run the entire query.
Bu şekilde derlem bağırsakindeki C# IEnumerable Kullanımı elemanlara sırasıyla ulaşım sağlamlanabilir. Kötüda bu tasarrufı gösteren bir örnek bulunmaktadır:
There are pros and cons to both. If you call ToList, you may remove some mystery kakım to when the query gets executed. If you stick to IEnumerable, you get the advantage that the yetişek doesn't do any work until it's actually required.
Oh sure, you hayat use it to create your own custom collection types. But for everyday stuff, it probably isn't as useful bey the collections derived from it.
Ya sarıklı, onca yazdın çizdin anladıkta iki satır IEnumerable yahut IEnumerator interfacelerini kullanmadın?
My question is that should these classes instead implement the IEnumerable interface, and call GetEnumerator on the List C# IEnumerable Nedir itself.
The most important thing to realize is that, using Linq, the query does not get evaluated immediately. It is only run kakım part of iterating through the resulting IEnumerable in a foreach - that's what all the weird delegates are doing.