c# qr codes The standard query operators in C#.NET

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appendix: The standard query operators
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The standard query operators
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Operator name Description Selects values, depending on their ability to be cast to a specified type. Selects values, depending on a predicate function.
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Operator name Description Selects values, depending on a selector function. Selects values, depending on a selector function, and combines resulting sequences into one sequence. SelectMany performs a one-to-many element projection over a sequence. It differs from Select in that the selector function is expected to return a sequence that is then expanded.
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Operator name Description Skips n elements from a sequence. Skips elements based on a predicate function until an element does not satisfy the condition. Takes n elements from a sequence. Takes elements based on a predicate function until an element does not satisfy the condition.
Skip SkipWhile Take TakeWhile
Join
Operator name Description Joins two sequences based on key selector functions and groups the resulting matches for each element. Joins two sequences based on key selector functions and extracts pairs of values.
GroupJoin Join
APPENDIX
The standard query operators
Concatenation
Operator name Description Concatenates two sequences to form one sequence.
Concat
Sorting
Operator name Description Sorts values in ascending order.
OrderBy
OrderByDescending Sorts values in descending order. ThenBy ThenByDescending Reverse
Performs a secondary sort in ascending order. Performs a secondary sort in descending order. Reverses the order of the elements in a sequence.
Grouping
Operator name Description Groups elements that share a common attribute. Each group is represented by an IGrouping<TKey, TElement> object. Inserts elements into a Lookup<TKey, TElement> (a one-to-many dictionary) based on a key selector function.
GroupBy ToLookup
Operator name Description Removes duplicate values from a collection. Returns the set difference, which means the elements of one sequence that do not appear in a second sequence. Returns the set intersection, which means elements that appear in each of two sequences. Returns the set union, which means unique elements that appear in either of two sequences.
Distinct Except Intersect Union
APPENDIX
The standard query operators
Conversion
Operator name Description Returns the input typed as IEnumerable<T>. Converts a (generic) IEnumerable to a (generic) IQueryable. Casts the elements of a sequence to a specified type. Selects values, depending on their ability to be cast to a specified type. Converts a collection to an array. This method forces query execution. Puts elements into a (one-to-one) Dictionary<TKey, TValue> based on a key selector function. Converts a collection to a List<T>. Inserts elements into a Lookup<TKey, TElement> (a one-to-many dictionary) based on a key selector function.
AsEnumerable AsQueryable Cast OfType ToArray ToDictionary ToList ToLookup
NOTE
By convention, the ToXXX operators cause the queries to execute. The AsXXX operators do not. This applies to the conversion operators, but should be respected for clarity for other operators as well, including custom ones.
Equality
Operator name Description Determines whether two sequences are equal by comparing elements in a pair-wise manner.
SequenceEqual
Element
Operator name Description Returns the element at a specified index in a sequence.
ElementAt
ElementAtOrDefault Returns the element at a specified index in a sequence or default(T) if
the index is out of range.
First FirstOrDefault
Returns the first element of a sequence, or the first element that satisfies a condition. Returns the first element of a sequence, or the first element that satisfies a condition. Returns default(T) if no such element exists.
APPENDIX
The standard query operators
Element (continued)
Operator name Description Returns the last element of a sequence, or the last element that satisfies a condition. Returns the last element of a sequence, or the last element that satisfies a condition. Returns default(T) if no such element exists. Returns the only element of a sequence, or the only element that satisfies a condition. Raises an InvalidOperationException if the sequence does not contain exactly one element. Returns the only element of a sequence, or the only element that satisfies a condition. Returns default(T) if no such element exists. Raises an InvalidOperationException if the sequence contains more than one element.
Last LastOrDefault Single
SingleOrDefault
Generation
Operator name Description Replaces an empty sequence with a default valued singleton sequence. Returns an empty sequence. Generates a sequence of integral numbers within a specified range. Generates a sequence that contains one repeated value.
DefaultIfEmpty Empty Range Repeat
Quantifiers
Operator name Description Determines whether all the elements in a sequence satisfy a condition. Determines whether any elements in a sequence satisfy a condition. Determines whether a sequence contains a specified element.
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