Class LINQExtensions

Provides static extension methods for performing common LINQ operations on IEnumerable<T> and IQueryable<T> collections.

Inheritance

object

LINQExtensions

Namespace: CapyKit.Extensions

Assembly: CapyKit.dll

Syntax

public static class LINQExtensions

Methods

Distinct<T, U>(IEnumerable<T>, Func<T, U>)

Enumerates distinct items in this collection as defined by the key property.

Declaration

public static IEnumerable<T> Distinct<T, U>(this IEnumerable<T> items, Func<T, U> property)

Parameters

Type	Name	Description
IEnumerable<T>	items	The items to act on.
Func<T, U>	property	The property.

Returns

Type	Description
IEnumerable<T>	An enumerator that allows foreach to be used to process distinct items in this collection.

Type Parameters

Name	Description
T	Generic type parameter of the parent object.
U	Generic type parameter property value.

Filter<T>(IEnumerable<T>, Func<T, bool>)

Filters out items matching a predicate from the collection.

Declaration

public static IEnumerable<T> Filter<T>(this IEnumerable<T> source, Func<T, bool> predicate)

Parameters

Type	Name	Description
IEnumerable<T>	source	The source to act on.
Func<T, bool>	predicate	The predicate.

Returns

Type	Description
IEnumerable<T>	An enumerator that allows foreach to be used to process remove in this collection.

Type Parameters

Name	Description
T	Generic type parameter.

Filter<T>(IQueryable<T>, Expression<Func<T, bool>>)

Filters out items matching a predicate from the collection.

Declaration

public static IQueryable<T> Filter<T>(this IQueryable<T> source, Expression<Func<T, bool>> predicate)

Parameters

Type	Name	Description
IQueryable<T>	source	The source to act on.
Expression<Func<T, bool>>	predicate	The predicate.

Returns

Type	Description
IQueryable<T>	An enumerator that allows foreach to be used to process remove in this collection.

Type Parameters

Name	Description
T	Generic type parameter.

LeftOuterJoin<T, U, TKey, R>(IEnumerable<T>, IEnumerable<U>, Func<T, TKey>, Func<U, TKey>, Func<T, IEnumerable<U>, R>, Func<T, U>)

An IEnumable<T> extension method that left outer join.

Declaration

public static IEnumerable<R> LeftOuterJoin<T, U, TKey, R>(this IEnumerable<T> source, IEnumerable<U> inner, Func<T, TKey> outerSelector, Func<U, TKey> innerSelector, Func<T, IEnumerable<U>, R> resultSelector, Func<T, U> defaultGenerator = null)

Parameters

Type	Name	Description
IEnumerable<T>	source	The source to act on.
IEnumerable<U>	inner	The inner.
Func<T, TKey>	outerSelector	The outer selector.
Func<U, TKey>	innerSelector	The inner selector.
Func<T, IEnumerable<U>, R>	resultSelector	The result selector.
Func<T, U>	defaultGenerator	(Optional) The default generator.

Returns

Type	Description
IEnumerable<R>	An enumerator that allows foreach to be used to process left outter join in this collection.

Type Parameters

Name	Description
T	Generic type parameter.
U	Generic type parameter.
TKey	Type of the key.
R	Type of the r.

LeftOuterJoin<T, U, TKey, R>(IQueryable<T>, IQueryable<U>, Expression<Func<T, TKey>>, Expression<Func<U, TKey>>, Func<T, IEnumerable<U>, R>, Func<T, U>)

An IQueryable<T> extension method that left outer join.

Declaration

public static IQueryable<R> LeftOuterJoin<T, U, TKey, R>(this IQueryable<T> source, IQueryable<U> inner, Expression<Func<T, TKey>> outerSelector, Expression<Func<U, TKey>> innerSelector, Func<T, IEnumerable<U>, R> resultSelector, Func<T, U> defaultGenerator = null)

Parameters

Type	Name	Description
IQueryable<T>	source	The source to act on.
IQueryable<U>	inner	The inner.
Expression<Func<T, TKey>>	outerSelector	The outer selector.
Expression<Func<U, TKey>>	innerSelector	The inner selector.
Func<T, IEnumerable<U>, R>	resultSelector	The result selector.
Func<T, U>	defaultGenerator	(Optional) The default generator.

Returns

Type	Description
IQueryable<R>	An IQueryable<R>

Type Parameters

Name	Description
T	Generic type parameter.
U	Generic type parameter.
TKey	Type of the key.
R	Type of the r.

PageCount<T>(IEnumerable<T>, int)

The number of pages of pageSize size in the given collection.

Declaration

public static int PageCount<T>(this IEnumerable<T> source, int pageSize)

Parameters

Type	Name	Description
IEnumerable<T>	source	The source to act on.
int	pageSize	Size of the page.

Returns

Type	Description
int	An int.

Type Parameters

Name	Description
T	Generic type parameter.

Exceptions

Type	Condition
ArgumentOutOfRangeException	Thrown when pageSize is less than 1.

PageCount<T>(IQueryable<T>, int)

The number of pages of pageSize size in the given collection.

Declaration

public static int PageCount<T>(this IQueryable<T> source, int pageSize)

Parameters

Type	Name	Description
IQueryable<T>	source	The source to act on.
int	pageSize	Size of the page.

Returns

Type	Description
int	An int.

Type Parameters

Name	Description
T	Generic type parameter.

Exceptions

Type	Condition
ArgumentOutOfRangeException	Thrown when pageSize is less than 1.

Page<T>(IEnumerable<T>, int, int)

Get a page of items from a collection, skipping pageNumber pages of pageSize items per page.

Declaration

public static IEnumerable<T> Page<T>(this IEnumerable<T> source, int pageNumber, int pageSize)

Parameters

Type	Name	Description
IEnumerable<T>	source	The source to act on.
int	pageNumber	The page number to retrieve.
int	pageSize	Number of items per page.

Returns

Type	Description
IEnumerable<T>	An enumerator that allows foreach to be used to process page in this collection.

Type Parameters

Name	Description
T	Generic type parameter.

Remarks

This method uses natural numbering starting at page 1.

Exceptions

Type	Condition
ArgumentOutOfRangeException	Thrown when pageNumber is less than 1 or if pageSize is less than 1.

Page<T>(IQueryable<T>, int, int)

Get a page of items from a collection, skipping pageNumber pages of pageSize items per page.

Declaration

public static IQueryable<T> Page<T>(this IQueryable<T> source, int pageNumber, int pageSize)

Parameters

Type	Name	Description
IQueryable<T>	source	The source to act on.
int	pageNumber	The page number to retrieve.
int	pageSize	.

Returns

Type	Description
IQueryable<T>	An enumerator that allows foreach to be used to process page in this collection.

Type Parameters

Name	Description
T	Generic type parameter.

Remarks

This method uses natural numbering starting at page 1.

Exceptions

Type	Condition
ArgumentOutOfRangeException	Thrown when pageNumber is less than 1 or if pageSize is less than 1.