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The Methods De ned by IDictionary<TKey, TValue>
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25:
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Collections, Enumerators, and Iterators
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IEnumerable<T> declares the GetEnumerator( ) method as shown here: IEnumerator<T> GetEnumerator( ) It returns an enumerator of type T for the collection Thus, it returns a type-safe enumerator IEnumerator<T> has the same two methods as does the non-generic IEnumerator: MoveNext( ) and Reset( ) It also declares a generic version of the Current property, as shown here: T Current { get; } It returns a T reference to the next object Thus, the generic version of Current is type-safe There is one other difference between IEnumerator and IEnumerator<T>: IEnumerator<T> inherits the IDisposable interface, but IEnumerator does not IDisposable defines the Dispose( ) method, which is used to free unmanaged resources
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PART II
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NOTE IEnumerable<T> also implements the non-generic IEnumerable interface Thus, it
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supports the non-generic version of GetEnumerator( ) IEnumerator<T> also implements the non-generic IEnumerator interface, thus supporting the non-generic versions of Current
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IComparer<T>
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The IComparer<T> interface is the generic version of IComparer described earlier The main difference between the two is that IComparer<T> is type-safe, declaring the generic version of Compare( ) shown here: int Compare(T x, T y) This method compares x with y and returns greater than zero if x is greater than y, zero if the two objects are the same, and less than zero if x is less that y
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IEqualityComparer<T>
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The IEqualityComparer<T> interface is the equivalent of its non-generic relative IEqualityComparer It defines these two methods: bool Equals(T x, T y) int GetHashCode(T obj) Equals( ) must return true if x and y are equal GetHashCode( ) must return the hash code for obj If two objects compare as equal, then their hash codes must also be the same
The ISet<T> Interface
The ISet<T> interface was added by version 40 of the NET Framework It defines the behavior of a generic collection that implements a set of unique elements It inherits IEnumerable, IEnumerable<T>, and ICollection<T> ISet<T> defines the set of methods shown in Table 25-13 Notice that the parameters to these methods are specified as IEnumerable<T> This means you can pass something other than another ISet<T> as the second set Most often, however, both arguments will be instances of ISet<T>
Part II:
Exploring the C# Library
Method void ExceptWith(IEnumerable<T> other) void IntersectWith(IEnumerable<T> other) bool IsProperSubsetOf(IEnumerable<T> other) bool IsProperSupersetOf(IEnumerable<T> other) bool IsSubsetOf(IEnumerable<T> other) bool IsSupersetOf(IEnumerable<T> other) bool Overlaps(IEnumerable<T> other) bool SetEquals(IEnumerable<T> other)
Description Removes from the invoking set those elements contained in other After calling this method, the invoking set contains the intersection of its elements and the elements in other Returns true if the invoking set is a proper subset of other, and false otherwise Returns true if the invoking set is a proper superset of other, and false otherwise Returns true if the invoking set is a subset of other, and false otherwise Returns true if the invoking set is a superset of other, and false otherwise Returns true if the invoking set and other have at least one element in common, and false otherwise Returns true if the invoking set and other have all elements in common, and false otherwise The order of the elements doesn t matter, and duplicate elements in other are ignored After calling this method, the invoking set will contain the symmetric difference between its elements and those in other After calling this method, the invoking set will contain the union of its elements and those in other
void SymmetricExceptWith( IEnumerable<T> other) void UnionWith(IEnumerable<T> other)
TABLE 25-13
The Set Operations De ned by ISet<T>
The KeyValuePair<TKey, TValue> Structure
SystemCollectionsGeneric defines a structure called KeyValuePair<TKey, TValue>, which is used to store a key and its value It is used by the generic collection classes that store key/value pairs, such as Dictionary<TKey, TValue> This structure defines the following two properties: public TKey Key { get; }; public TValue Value { get; }; These properties hold the key or value associated with an entry You can construct a KeyValuePair<TKey, TValue> object by using the following constructor: public KeyValuePair(TKey key, TValue value) Here, key is the key and value is the value
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