linq to object的常用方法收藏

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主要的操作方法

 

Operator Type	Operator	Description
Aggregation	Aggregate	The Aggregate operator applies a function over a sequence.
	Average	The Average operator computes the average of a sequence of numeric values.
	Count	The Count operator counts the number of elements in a sequence with a return type of int.
	LongCount	The LongCount operator counts the number of elements in a sequence with a return type of Long.
	Max	The Max operator finds the maximum of a sequence of numeric values.
	Min	The Min operator finds the minimum of a sequence of numeric values.
	Sum	The Sum operator computes the sum of a sequence of numeric values.
Concatenation	Concat	The Concat operator concatenates two sequences.
Conversion	Cast	The Cast operator casts the elements of a sequence to a given type.
	OfType	The OfType operator filters the elements of a sequence based on a type.
	ToArray	The ToArray operator creates an array from a sequence.
	ToDictionary	The ToDictionary operator creates a Dictionary from a sequence.
	ToList	The ToList operator creates a List from a sequence.
	ToLookup	The ToLookup operator creates a Lookup from a sequence.
	ToSequence	The ToSequence operator returns its argument typed as IEnumerable.
Element	DefaultIfEmpty	The DefaultIfEmpty operator supplies a default element for an empty sequence.
	ElementAt	The ElementAt operator returns the element at a given index in a sequence.
	ElementAtOrDefault	The ElementAtOrDefault operator returns the element at a given index in a sequence, or a default value if the index is out of range.
	First	The First operator returns the first element of a sequence.
	FirstOrDefault	The FirstOrDefault operator returns the first element of a sequence, or a default value if no element is found.
	Last	The Last operator returns the last element of a sequence.
	LastOrDefault	The LastOrDefault operator returns the last element of a sequence, or a default value if no element is found.
	Single	The Single operator returns the single element of a sequence.
	SingleOrDefault	The SingleOrDefault operator returns the single element of a sequence, or a default value if no element is found.
Equality	SequenceEqual	The SequenceEqual operator checks whether two sequences are equal.
Generation	Empty	The Empty operator returns an empty sequence of a given type.
	Range	The Range operator generates a sequence of integral numbers.
	Repeat	The Repeat operator generates a sequence by repeating a value a given number of times.
Grouping	GroupBy	The GroupBy operator groups the elements of a sequence.
Joining	GroupJoin	The GroupJoin operator performs a grouped join of two sequences based on matching keys extracted from the elements.
	Join	The Join operator performs an inner join of two sequences based on matching keys extracted from the elements.
Ordering	OrderBy	The OrderBy operator orders a sequence according to one or more keys in ascending order.
	ThenBy	The ThenBy operator orders an ordered sequence according to one or more keys in ascending order.
	OrderByDescending	The OrderBy operator orders a sequence according to one or more keys in descending order.
	ThenByDescending	The ThenBy operator orders an ordered sequence according to one or more keys in descending order.
	Reverse	The Reverse operator reverses the elements of a sequence.
Partitioning	Skip	The Skip operator skips a given number of elements from a sequence and then yields the remainder of the sequence.
	SkipWhile	The SkipWhile operator skips elements from a sequence while a test is true and then yields the remainder of the sequence.
	Take	The Take operator yields a given number of elements from a sequence and then skips the remainder of the sequence.
	TakeWhile	The TakeWhile operator yields elements from a sequence while a test is true and then skips the remainder of the sequence.
Quantifiers	All	The All operator checks whether all elements of a sequence satisfy a condition.
	Any	The Any operator checks whether any element of a sequence satisfies a condition.
	Contains	The Contains operator checks whether a sequence contains a given element.
Restriction	Where	The Where operator filters a sequence based on a predicate.
Projection	Select	The Select operator performs a projection over a sequence.
	SelectMany	The SelectMany operator performs a one to many element projection over a sequence.
Set	Distinct	The Distinct operator eliminates duplicate elements from a sequence.
	Except	The Except operator produces the set difference between two sequences.
	Intersect	The Intersect operator produces the set intersection of two sequences.
	Union	The Union operator produces the set union of two sequences.