Linq to Objects

Query operators:

where operator

Projection operator: Select, SelectMany

Sort operators:

Orderbydescending,thenby,thenbydescending must first use the order before using ThenBy,

Reverse operator: Reverses the results of the query

Grouping operator: GroupBy

Join operator: Join,groupjoin

Set Operator:

DISTINCT: Removing duplicates

Union: Enumerates the first and second series sequentially, with the same non-repeating enumeration in the second sequence as in the first sequence

Intersect: produces only the elements in two sequences, taking the intersection

Except: Occurs in all elements in the first sequence that do not appear in the second sequence, and excludes all elements contained in the second sequence in the first sequence

Aggregation operators:

Sum: Sum

Min: Minimum value

Max: Max value

Average: Average

Aggregate: Cumulative

Build operator:

Range:

Repeat:

Quantifier operators:

Any: exists, existence returns true otherwise returns false

All: If all items meet the filter criteria, all elements conform to return true otherwise return false

Contains: Whether it contains

Partitioning operators:

Take: Returns the value of the specified sequence length by querying the top n items

TakeWhile:

Skip:

SkipWhile:

Element operator:

First:

FirstOrDefault:

Last:

LastOrDefault:

Single: Select a specific and unique item from the meta sequence

Singleordefault:

ElementAt: Extracting specific items from a sequence

Elementatordefault:

Defaultorempty: Returns a default element for an empty sequence, a left-hand inoculation, which can be assigned a default value in place of a possible null value

Other operators:

Contact: Appends a sequence to another sequence, in series

SequenceEqual: Compares each item in the first sequence to an item in the second sequence, if the number of two series items, the content, the position are the same, is considered equal

Conversion operators:

AsEnumerable: Returning the source sequence to an object of type ienumerable<tsource>

Tolist/toarray:

ToDictionary: The first argument of the operator is the keyselector predicate and is used as the key. ToDictionary (C=>c.name, C=>new{c.name, c.city});

ToLookup:

Oftype/cast: Filter/convert source sequence and generate TResult type

　　

Linq to Objects