Without access to an IEnumerator object it would not be possible to traverse the elements of a collection in a foreach loop.
An IEnumerator object is used as the basis of traversal in a foreach loop. We have discussed the non-generic versions of both interfaces in Section 31.6. Operations in the interface IEnumerator:.Operations in the interface IEnumerable:Īs the name indicates, GetEnumerator returns an enumerator, which offers the following interface:.The type parameter T is the type of the elements in the collection. The interface IEnumerable announces one parameterless Step through all elements of a collection. HashSet is, however, much more efficient than Set.Īt the most general level of Figure 45.1 traversability is emphasized. NET Framework contains a class, HashSet, that supports the mathematical set concept.Īs such, it is similar to the class Set, which we used as example for introduction of A more detailed discussion of the Array class is carried out in Section 47.1. Notice, however, that Array 's implementation of IList is carried out by special means,Īnd that it does not show up in the usual C# documentation. The class System.Array (see Section 28.2 ) which conceptually is the superclass of all native array types in C#,Īlso implements the generic interfaces IList. In Figure 45.1 are interfaces and the grey boxes are classes.įigure 45.1 The class and interface inheritance tree related to ListsĪll interfaces and classes seen in Figure 45.1, apart from Stack and Queue, will be discussed in the forthcoming sections of the current chapter. We start by showing a type hierarchy of list-related types. Overview of Generic Collections in C#Ĭontents Up Previous Next Slide Annotated slide Aggregated slides Subject index Program index Exercise index In this chapter we will study different list interfaces and classes.Ĥ5.1 Overview of Generic Collections in C#Ĥ5.11 Sample use of the Find operations in ListĤ5.8 Specialization of Collections - a realistic exampleĤ5.17 Time complexity overview: Collection classesĤ5.18 Using Collections through InterfacesĤ5.1.
#What are icollections pdf
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