C sharp array vs arraylist
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Since the main premise of your question is thus defeated, I'm assuming this answers your question. I am certain the memory usage also differs non-trivially. From the question I linked: List/foreach: 3054ms (589725196)Īrrays are twice as fast in certain important cases. Your question has actually already been answered before.Īnd seems also just as efficient in memory and performance as an array. (again, this is something that could be implemented for List as well, but this feature does not exist in c#) You need an array if you want to efficiently copy parts of the collection Array.Copy(array1, index1, array2, index2, length) // can't get any faster than thisĭouble arraySerialized = new double Īrray.Copy(array2d, 0, arraySerialized, 0, arraySerialized.Length) (note that it would be possible to implement a constructor for List that does the same, it's just that c# does not offer this feature) since List uses an array as backing storage,įor (int i =0 i<1000 i++) myList.Add(0) // slow and inelegant List myList = new List(1000) // internally contains 1000 '0' values, double myArray = new double // contains 1000 '0' values You need an array if you quickly and efficiently want to initialize your fixed-size collection with the default value.
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That can be useful for lock-free threadsafe code. Interlocked.Increment(ref myList) // does not work, you can't pass a property by reference Interlocked.Increment(ref myArray) // works More seriously, you need an array if you want to pass an element by reference. (note that there may be some cases where an array of mutable struct is desireable, but usually this differing behavior of mutable structs within arrays versus other collections is a source of errors that should be avoided) MyList.X = 1 // does not work, the List will return a *copy* of the struct MyArray.X = 1 // works, this modifies the original struct struct EvilMutableStruct // don't do thisĮvilMutableStruct myArray = new EvilMutableStruct
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You need arrays to manage your collection of mutable structs, of course, and what would we do without those.
C sharp array vs arraylist code#
NET to Mono and even between different versions of the framework.Īnd it is sometimes easier to port a piece of code that uses an array instead of a framework dependent type. Now while implementing specific algorithms, you can't always rely on someone else's implementation of a type that is general purpose. If I won't add or remove any items from that data collection, I want to make sure that the type reflects that.Īnother thing is let's say you are implementing a new data structure and you've read some papers about it. The most important reason I use an array instead of a List is to imply that the data is fixed length. Array is also available everywhere and known by developers using different languages and platforms.
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I don't use something that I won't use the features of.įirst of all an array is a primitive construct so an array is faster and more efficient than a List for sure, so your argument is not true. The same reason I don't drive a truck when going to work.