ILookup<TKey,TElement> Interface

Defines an indexer, size property, and Boolean search method for data structures that map keys to IEnumerable<T> sequences of values.

Namespace: Spring.Collections
IInvokable
  Spring.Collections.IEnumerable
    Spring.Collections.IEnumerable<T>
      Spring.Collections.ILookup<TKey,TElement>
        Spring.Collections.Extensions.TLookup<TKey,TElement>
type
 ILookup<TKey, TElement> = interface(IEnumerable<IGrouping<TKey, TElement>>)
 ['{B2380533-F2B1-465B-84B2-97FA79A6EE09}']
 end;

Type Parameters

TKey
The type of the keys in the ILookup<TKey, TElement>.
TElement
The type of the elements in the IEnumerable<T> sequences that make up the values in the ILookup<TKey, TElement>.

The ILookup<TKey,TElement> type exposes the following members.

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 NameDescription
Comparer

Gets the assigned comparer. If not comparer was assigned it returns the default comparer. (Inherited from IEnumerable<T>.)

Count

Returns the number of elements in a sequence. (Inherited from IEnumerable.)

ElementType

Returns the type of the elements in the sequence. (Inherited from IEnumerable.)

IsEmpty

Determines whether the sequence contains no elements. (Inherited from IEnumerable.)

Item[TKey]

Gets the IEnumerable<T> sequence of values indexed by a specified key.

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Show:
 NameDescription
Aggregate(TFunc)

Applies an accumulator function over a sequence. (Inherited from IEnumerable<T>.)

All(TPredicate<T>)

Determines whether all elements of a sequence satisfy a condition. (Inherited from IEnumerable<T>.)

Any

Overloaded. Determines whether a sequence contains any elements. (Inherited from IEnumerable<T>.)

Any(TPredicate<T>)

Overloaded. Determines whether any element of a sequence satisfies a condition. (Inherited from IEnumerable<T>.)

AsObject

Returns the reference to this instance. (Inherited from IEnumerable.)

Concat(IEnumerable<T>)

Overloaded. Concatenates two sequences. (Inherited from IEnumerable<T>.)

Contains(T,IEqualityComparer)

Overloaded. Determines whether a sequence contains a specified element by using a specified IEqualityComparer<T>. (Inherited from IEnumerable<T>.)

Contains(T,TEqualityComparison)

Overloaded. Represents method Contains(T,TEqualityComparison). (Inherited from IEnumerable<T>.)

Contains(TKey)

Determines whether a specified key exists in the ILookup<TKey, TElement>.

ElementAt(Integer)

Returns the element at a specified index in a sequence. (Inherited from IEnumerable<T>.)

ElementAtOrDefault(Integer)

Overloaded. Returns the element at a specified index in a sequence or a default value if the index is out of range. (Inherited from IEnumerable<T>.)

ElementAtOrDefault(Integer,T)

Overloaded. Returns the element at a specified index in a sequence or the specified default value if the index is out of range. (Inherited from IEnumerable<T>.)

EqualsTo(IEnumerable<T>)

Overloaded. Determines whether two sequences are equal by comparing the elements by using the default equality comparer for their type. (Inherited from IEnumerable<T>.)

EqualsTo(IEnumerable<T>,IEqualityComparer)

Overloaded. Determines whether two sequences are equal by comparing their elements by using a specified IEqualityComparer<T>. (Inherited from IEnumerable<T>.)

EqualsTo(T[])

Overloaded. Determines whether two sequences are equal by comparing the elements by using the default equality comparer for their type. (Inherited from IEnumerable<T>.)

First

Overloaded. Returns the first element of a sequence. (Inherited from IEnumerable<T>.)

First(TPredicate<T>)

Overloaded. Returns the first element in a sequence that satisfies a specified condition. (Inherited from IEnumerable<T>.)

FirstOrDefault

Overloaded. Returns the first element of a sequence, or a default value if the sequence contains no elements. (Inherited from IEnumerable<T>.)

FirstOrDefault(T)

Overloaded. Returns the first element of a sequence, or the specified default value if the sequence contains no elements. (Inherited from IEnumerable<T>.)

FirstOrDefault(TPredicate<T>)

Overloaded. Returns the first element of the sequence that satisfies a condition or a default value if no such element is found. (Inherited from IEnumerable<T>.)

FirstOrDefault(TPredicate<T>,T)

Overloaded. Returns the first element of the sequence that satisfies a condition or the specified default value if no such element is found. (Inherited from IEnumerable<T>.)

ForEach(TAction<T>)

Performs the specified action on each element of a sequence. (Inherited from IEnumerable<T>.)

GetComparer

Returns the specified comparer for this instance. (Inherited from IEnumerable<T>.)

GetCount

Represents method GetCount. (Inherited from IEnumerable.)

GetElementType

Represents method GetElementType. (Inherited from IEnumerable.)

GetEnumerator

Returns an enumerator that iterates through the collection. (Inherited from IEnumerable<T>.)

GetIsEmpty

Represents method GetIsEmpty. (Inherited from IEnumerable.)

GetItem(TKey)

Represents method GetItem(TKey).

Last

Overloaded. Returns the last element of a sequence. (Inherited from IEnumerable<T>.)

Last(TPredicate<T>)

Overloaded. Returns the last element of a sequence that satisfies a specified condition. (Inherited from IEnumerable<T>.)

LastOrDefault

Overloaded. Returns the last element of a sequence, or a default value if the sequence contains no elements. (Inherited from IEnumerable<T>.)

LastOrDefault(T)

Overloaded. Returns the last element of a sequence, or the specified default value if the sequence contains no elements. (Inherited from IEnumerable<T>.)

LastOrDefault(TPredicate<T>)

Overloaded. Returns the last element of a sequence that satisfies a condition or a default value if no such element is found. (Inherited from IEnumerable<T>.)

LastOrDefault(TPredicate<T>,T)

Overloaded. Returns the last element of a sequence that satisfies a condition or the specified default value if no such element is found. (Inherited from IEnumerable<T>.)

Max

Overloaded. Returns the maximum value in a sequence. (Inherited from IEnumerable<T>.)

Max(IComparer)

Overloaded. Returns the maximum value in a sequence by using the specified IComparer<T> . (Inherited from IEnumerable<T>.)

Max(TComparison)

Overloaded. Represents method Max(TComparison). (Inherited from IEnumerable<T>.)

Max(TFunc)

Overloaded. Represents method Max(TFunc). (Inherited from IEnumerable<T>.)

Min

Overloaded. Returns the minimum value in a sequence. (Inherited from IEnumerable<T>.)

Min(IComparer)

Overloaded. Returns the minimum value in a sequence by using the specified IComparer<T> . (Inherited from IEnumerable<T>.)

Min(TComparison)

Overloaded. Represents method Min(TComparison). (Inherited from IEnumerable<T>.)

Min(TFunc)

Overloaded. Represents method Min(TFunc). (Inherited from IEnumerable<T>.)

Ordered

Overloaded. Sorts the elements of a sequence in ascending order using the default comparer for their type. (Inherited from IEnumerable<T>.)

Ordered(IComparer)

Overloaded. Sorts the elements of a sequence in ascending order using the specified IComparer<T>. (Inherited from IEnumerable<T>.)

Ordered(TComparison)

Overloaded. Represents method Ordered(TComparison). (Inherited from IEnumerable<T>.)

Reversed

Inverts the order of the elements in a sequence. (Inherited from IEnumerable<T>.)

Shuffled

Returns the sequence in a shuffled order. (Inherited from IEnumerable<T>.)

Single

Overloaded. Returns the only element of a sequence, and throws an exception if there is not exactly one element in the sequence. (Inherited from IEnumerable<T>.)

Single(TPredicate<T>)

Overloaded. Returns the only element of a sequence, and throws an exception if there is not exactly one element in the sequence. (Inherited from IEnumerable<T>.)

SingleOrDefault

Overloaded. Returns the only element of a sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence. (Inherited from IEnumerable<T>.)

SingleOrDefault(T)

Overloaded. Returns the only element of a sequence, or the specified default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence. (Inherited from IEnumerable<T>.)

SingleOrDefault(TPredicate<T>)

Overloaded. Returns the only element of a sequence that satisfies a specified condition or a default value if no such element exists; this method throws an exception if more than one element satisfies the condition. (Inherited from IEnumerable<T>.)

SingleOrDefault(TPredicate<T>,T)

Overloaded. Returns the only element of a sequence that satisfies a specified condition or the specified default value if no such element exists; this method throws an exception if more than one element satisfies the condition. (Inherited from IEnumerable<T>.)

Skip(Integer)

Bypasses a specified number of elements in a sequence and then returns the remaining elements. (Inherited from IEnumerable<T>.)

SkipWhile(TFunc)

Overloaded. Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements. The element's index is used in the logic of the predicate function. (Inherited from IEnumerable<T>.)

SkipWhile(TPredicate<T>)

Overloaded. Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements. (Inherited from IEnumerable<T>.)

Sum

Overloaded. Computes the sum of the sequence. (Inherited from IEnumerable<T>.)

Take(Integer)

Returns a specified number of contiguous elements from the start of a sequence. (Inherited from IEnumerable<T>.)

TakeWhile(TFunc)

Overloaded. Returns elements from a sequence as long as a specified condition is true. The element's index is used in the logic of the predicate function. (Inherited from IEnumerable<T>.)

TakeWhile(TPredicate<T>)

Overloaded. Returns elements from a sequence as long as a specified condition is true. (Inherited from IEnumerable<T>.)

ToArray

Creates a new array which is filled with the elements in the collection. (Inherited from IEnumerable<T>.)

TryGetFirst(T)

Overloaded. Try getting the first element in a sequence. (Inherited from IEnumerable<T>.)

TryGetFirst(T,TPredicate<T>)

Overloaded. Try getting the first element in a sequence that satisfies a specified condition. (Inherited from IEnumerable<T>.)

TryGetLast(T)

Overloaded. Try getting the last element in a sequence. (Inherited from IEnumerable<T>.)

TryGetLast(T,TPredicate<T>)

Overloaded. Try getting the last element in a sequence that satisfies a specified condition. (Inherited from IEnumerable<T>.)

TryGetSingle(T)

Overloaded. Try getting the only element in a sequence. (Inherited from IEnumerable<T>.)

TryGetSingle(T,TPredicate<T>)

Overloaded. Try getting the only element in a sequence that satisfies a specified condition. (Inherited from IEnumerable<T>.)

Where(TPredicate<T>)

Overloaded. Filters a sequence of values based on a predicate. (Inherited from IEnumerable<T>.)

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