Class IEnumerableTEx

Class containing some extension methods for System.Collections.Generic.IEnumerable<T>.

Inheritance

System.Object

IEnumerableTEx

Inherited Members

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace:Extend

Assembly:Extend.dll

Syntax

public static class IEnumerableTEx

Methods

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AnyAndNotNull<T>(IEnumerable<T>)

Checks if the given IEnumerable is not null and contains some items.

Declaration

public static bool AnyAndNotNull<T>(this IEnumerable<T> enumerable)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable to act on.

Returns

Type	Description
System.Boolean	Returns true if the IEnumerable is not null or empty, otherwise false.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Examples

 
List<String> strings = null;
Console.WriteLine( strings.AnyAndNotNull() ); // False
strings = new List<String>();
Console.WriteLine( strings.AnyAndNotNull() ); // False
strings.AddRange( "1", "2", "3" );
Console.WriteLine( strings.AnyAndNotNull() ); // True

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AnyAndNotNull<T>(IEnumerable<T>, Func<T, Boolean>)

Checks if the given IEnumerable is not null and contains some items which mates the given predicate.

Declaration

public static bool AnyAndNotNull<T>(this IEnumerable<T> enumerable, Func<T, bool> predicate)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable to act on.
System.Func<T, TResult><T, System.Boolean>	predicate	The predicate.

Returns

Type	Description
System.Boolean	Returns true if the IEnumerable is not null or empty, otherwise false.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The predicate can not be null.

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Append<T>(IEnumerable<T>, T)

Appends the given item to the given sequence.

Declaration

public static IEnumerable<T> Append<T>(this IEnumerable<T> source, T item)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	source	The sequence to append an item to.
T	item	The item to append.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>	The source sequence followed by the appended item.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	source can not be null.

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ContainsAll<T>(IEnumerable<T>, T[])

s Checks if the IEnumerable contains all given values.

Declaration

public static bool ContainsAll<T>(this IEnumerable<T> enumerable, params T[] values)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable to act on.
T[]	values	The values to search for.

Returns

Type	Description
System.Boolean	Returns true if the IEnumerable contains all given values, otherwise false.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.
System.ArgumentNullException	The values can not be null.

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ContainsAll<T>(IEnumerable<T>, IEnumerable<T>)

s Checks if the IEnumerable contains all values of the given IEnumerable.

Declaration

public static bool ContainsAll<T>(this IEnumerable<T> enumerable, IEnumerable<T> values)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable to act on.
System.Collections.Generic.IEnumerable<T><T>	values	The IEnumerable containing the values to search for.

Returns

Type	Description
System.Boolean	Returns true if the IEnumerable contains all given values, otherwise false.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.
System.ArgumentNullException	The values can not be null.

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ContainsAny<T>(IEnumerable<T>, T[])

Checks if the IEnumerable contains any of the given values.

Declaration

public static bool ContainsAny<T>(this IEnumerable<T> enumerable, params T[] values)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable to act on.
T[]	values	The values to search for.

Returns

Type	Description
System.Boolean	Returns true if the IEnumerable contains any of the given values, otherwise false.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.
System.ArgumentNullException	The values can not be null.

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ContainsAny<T>(IEnumerable<T>, IEnumerable<T>)

Checks if the IEnumerable contains any of the values of the given IEnumerable.

Declaration

public static bool ContainsAny<T>(this IEnumerable<T> enumerable, IEnumerable<T> values)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable to act on.
System.Collections.Generic.IEnumerable<T><T>	values	The IEnumerable containing the values to search for.

Returns

Type	Description
System.Boolean	Returns true if the IEnumerable contains any of the values of the given IEnumerable, otherwise false.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.
System.ArgumentNullException	The values can not be null.

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

Returns all unique items, based on the given predicate.

Declaration

public static IEnumerable<T> Distinct<T, TKey>(this IEnumerable<T> enumerable, Func<T, TKey> predicate)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable.
System.Func<T, TResult><T, TKey>	predicate	The Predicate.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.
TKey	The input type of the predicate.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.
System.ArgumentNullException	The predicate can not be null.

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EnsureNotNull<T>(IEnumerable<T>)

Ensures that the given System.Collections.Generic.IEnumerable<T> is not null.

Declaration

public static IEnumerable<T> EnsureNotNull<T>(this IEnumerable<T> enumerable)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>	Returns the given IEnumerable if it's not null, otherwise an empty array of type T.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

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Except<TSource, TKey>(IEnumerable<TSource>, IEnumerable<TSource>, Func<TSource, TKey>, IEqualityComparer<TKey>)

Produces the set difference of two sequences by using the specified

System.Collections.Generic.IEqualityComparer<T> to compare values.

Declaration

public static IEnumerable<TSource> Except<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TSource> second, Func<TSource, TKey> keySelector, IEqualityComparer<TKey> comparer = null)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><TSource>	first	An System.Collections.Generic.IEnumerable<T> whose elements that are not also in second will be returned.
System.Collections.Generic.IEnumerable<T><TSource>	second	An System.Collections.Generic.IEnumerable<T> whose elements that also occur in the first sequence will cause those elements to be removed from the returned sequence.
System.Func<T, TResult><TSource, TKey>	keySelector	A function used to select the key of the items to compare.
System.Collections.Generic.IEqualityComparer<T><TKey>	comparer	An optional System.Collections.Generic.IEqualityComparer<T> to compare the keys of the items.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><TSource>	A sequence that contains the set difference of the elements of two sequences.

Type Parameters

Name	Description
TSource	The type of the items to compare.
TKey	The type of the item keys.

Exceptions

Type	Condition
System.ArgumentNullException	first can not be null.
System.ArgumentNullException	second can not be null.
System.ArgumentNullException	keySelector can not be null.

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ForEach<T>(IEnumerable<T>, Action<T, Int32>)

Performs the specified action on each object in the given enumerable.

Declaration

public static IEnumerable<T> ForEach<T>(this IEnumerable<T> enumerable, Action<T, int> action)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The enumerable containing all the items.
System.Action<T1, T2><T, System.Int32>	action	The action to perform on each item of the given enumerable. The action takes a item of the given enumerable and it's index as parameter.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>

Type Parameters

Name	Description
T	The type of the items in the given enumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The source collection can not be null.
System.ArgumentNullException	The action can not be null.

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ForEach<T>(IEnumerable<T>, Action<T>)

Performs the specified action on each object in the given enumerable.

Declaration

public static IEnumerable<T> ForEach<T>(this IEnumerable<T> enumerable, Action<T> action)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The enumerable containing all the items.
System.Action<T><T>	action	The action to perform on each item of the given enumerable.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>

Type Parameters

Name	Description
T	The type of the items in the given enumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The source collection can not be null.
System.ArgumentNullException	The action can not be null.

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ForEachReverse<T>(IEnumerable<T>, Action<T>)

Executes the given action for each item in the IEnumerable in a reversed order.

Declaration

public static IEnumerable<T> ForEachReverse<T>(this IEnumerable<T> enumerable, Action<T> action)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable to act on.
System.Action<T><T>	action	The action to execute for each item in the IEnumerable.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>

Type Parameters

Name	Description
T

Remarks

It's save to remove items from the IEnumerable within the loop.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.
System.ArgumentNullException	The action can not be null.

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GetEqualItemsFromStart<T>(IEnumerable<T>, IEnumerable<T>, IEqualityComparer<T>)

Returns the equal items of two IEnumerables, according to the specified comparer. Beginning at the start of the IEnumerables, ending when first different item is found.

Declaration

public static IEnumerable<T> GetEqualItemsFromStart<T>(this IEnumerable<T> left, IEnumerable<T> right, IEqualityComparer<T> comparer = null)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	left	The first IEnumerable.
System.Collections.Generic.IEnumerable<T><T>	right	The second IEnumerable.
System.Collections.Generic.IEqualityComparer<T><T>	comparer	The comparer used to test items for equality.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>	A sequence consisting of the first elements of left that match the first elements of right. The resulting sequence ends when the two input sequence start to differ.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

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GetRandomItem<T>(IEnumerable<T>)

Gets a random item form the given IEnumerable.

Declaration

public static T GetRandomItem<T>(this IEnumerable<T> enumerable)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable.

Returns

Type	Description
T	Returns an random item of the given IEnumerable.

Type Parameters

Name	Description
T	The type of the items in the enumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.

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Intersect<TSource, TKey>(IEnumerable<TSource>, IEnumerable<TSource>, Func<TSource, TKey>, IEqualityComparer<TKey>)

Produces the set intersection of two sequences.

Declaration

public static IEnumerable<TSource> Intersect<TSource, TKey>(this IEnumerable<TSource> first, IEnumerable<TSource> second, Func<TSource, TKey> keySelector, IEqualityComparer<TKey> comparer = null)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><TSource>	first	An System.Collections.Generic.IEnumerable<T> whose distinct elements that also appear in second will be returned.
System.Collections.Generic.IEnumerable<T><TSource>	second	An System.Collections.Generic.IEnumerable<T> whose distinct elements that also appear in the first sequence will be returned.
System.Func<T, TResult><TSource, TKey>	keySelector	A function used to select the key of the items to compare.
System.Collections.Generic.IEqualityComparer<T><TKey>	comparer	An optional System.Collections.Generic.IEqualityComparer<T> to compare the keys of the items.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><TSource>	Returns a sequence that contains the elements that form the set intersection of two sequences.

Type Parameters

Name	Description
TSource	The type of the items to compare.
TKey	The type of the item keys.

Exceptions

Type	Condition
System.ArgumentNullException	first can not be null.
System.ArgumentNullException	second can not be null.
System.ArgumentNullException	keySelector can not be null.

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IsNullOrEmpty<T>(IEnumerable<T>)

Checks if the enumerable is empty or null.

Declaration

public static bool IsNullOrEmpty<T>(this IEnumerable<T> enumerable)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The enumerable to check.

Returns

Type	Description
System.Boolean	Returns true if the enumerable is empty or null, otherwise false.

Type Parameters

Name	Description
T	The type of the items in the enumerable.

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Many<T>(IEnumerable<T>)

Gets whether the IEnumerable contains more than one item.

Declaration

public static bool Many<T>(this IEnumerable<T> enumerable)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable.

Returns

Type	Description
System.Boolean	Returns true if the IEnumerable contains more than one item, otherwise false.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.

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Many<T>(IEnumerable<T>, Func<T, Boolean>)

Gets whether the IEnumerable contains more than one item matching the given predicate.

Declaration

public static bool Many<T>(this IEnumerable<T> enumerable, Func<T, bool> predicate)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable.
System.Func<T, TResult><T, System.Boolean>	predicate	The predicate.

Returns

Type	Description
System.Boolean	Returns true if the IEnumerable contains more than one item matching the given predicate, otherwise false.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.
System.ArgumentNullException	The predicate can not be null.

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MinimumOf<T>(IEnumerable<T>, Int32)

Gets whether the IEnumerable contains at least the specified number of items.

Declaration

public static bool MinimumOf<T>(this IEnumerable<T> enumerable, int count)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable.
System.Int32	count	The minimum number of items.

Returns

Type	Description
System.Boolean	Returns true if the IEnumerable contains at least the specified number of items, otherwise false.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.

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MinimumOf<T>(IEnumerable<T>, Int32, Func<T, Boolean>)

Gets whether the IEnumerable contains at least the specified number of items matching the specified predicate.

Declaration

public static bool MinimumOf<T>(this IEnumerable<T> enumerable, int count, Func<T, bool> predicate)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable.
System.Int32	count	The minimum number of items.
System.Func<T, TResult><T, System.Boolean>	predicate	The predicate.

Returns

Type	Description
System.Boolean	Returns true if the IEnumerable contains at least the specified number of items matching the specified predicate, otherwise false.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.
System.ArgumentNullException	The predicate can not be null.

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NotAny<T>(IEnumerable<T>)

Determines whether the given IEnumerable contains no items, or not.

Declaration

public static bool NotAny<T>(this IEnumerable<T> enumerable)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable to check.

Returns

Type	Description
System.Boolean	Returns true if the IEnumerable doesn't contain any items, otherwise false.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.

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NotAny<T>(IEnumerable<T>, Func<T, Boolean>)

Determines whether the given IEnumerable contains no items matching the given predicate, or not.

Declaration

public static bool NotAny<T>(this IEnumerable<T> enumerable, Func<T, bool> predicate)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable to check.
System.Func<T, TResult><T, System.Boolean>	predicate	The predicate.

Returns

Type	Description
System.Boolean	Returns true if the IEnumerable doesn't contain any items, otherwise false.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.
System.ArgumentNullException	The predicate can not be null.

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Partition<T>(IEnumerable<T>, Int32)

Partitions the given sequence into blocks with the specified size.

Declaration

public static IEnumerable<IEnumerable<T>> Partition<T>(this IEnumerable<T> source, int size)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	source	The sequence to partition.
System.Int32	size	The number of items per block.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><System.Collections.Generic.IEnumerable<T><T>>	Returns the created blocks.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	source can not be null.
System.ArgumentOutOfRangeException	size is smaller than 1.

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Prepend<T>(IEnumerable<T>, T)

Prepends the given item to the given sequence.

Declaration

public static IEnumerable<T> Prepend<T>(this IEnumerable<T> source, T item)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	source	The sequence to prepend an item to.
T	item	The item to prepend.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>	The source sequence preceded by the prepended item.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	source can not be null.

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Randomize<T>(IEnumerable<T>)

Orders the items in the IEnumerable randomly.

Declaration

public static IEnumerable<T> Randomize<T>(this IEnumerable<T> enumerable)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>

Type Parameters

Name	Description
T	The type of the items in the enumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.

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SpecificationForItems<T>(IEnumerable<T>, Func<T, Boolean>, String)

Creates a specification with the given condition and message.

Declaration

public static ISpecification<T> SpecificationForItems<T>(this IEnumerable<T> enumerable, Func<T, bool> expression, string message = null)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The enumerable to create the expression on.
System.Func<T, TResult><T, System.Boolean>	expression	An expression determining whether an object matches the specification or not.
System.String	message	An error messaged, returned when an object doesn't match the specification.

Returns

Type	Description
ISpecification<T><T>	Returns a specification with the given condition and message.

Type Parameters

Name	Description
T	The target type of the expression.

Exceptions

Type	Condition
System.ArgumentNullException	expression can not be null.

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StringJoin<T>(IEnumerable<T>, Func<T, String>, String)

Concatenates all the elements of a IEnumerable, using the specified separator between each element.

Declaration

public static string StringJoin<T>(this IEnumerable<T> enumerable, Func<T, string> selector, string separator = "")

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	An IEnumerable that contains the elements to concatenate.
System.Func<T, TResult><T, System.String>	selector	A transform function to apply to each element.
System.String	separator	The string to use as a separator. The separator is included in the returned string only if the given IEnumerable has more than one item.

Returns

Type	Description
System.String	A string that consists of the elements in the IEnumerable delimited by the separator string. If the given IEnumerable is empty, the method returns String.Empty.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.

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StringJoin<T>(IEnumerable<T>, String)

Concatenates all the elements of a IEnumerable, using the specified separator between each element.

Declaration

public static string StringJoin<T>(this IEnumerable<T> enumerable, string separator = "")

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	An IEnumerable that contains the elements to concatenate.
System.String	separator	The string to use as a separator. The separator is included in the returned string only if the given IEnumerable has more than one item.

Returns

Type	Description
System.String	A string that consists of the elements in the IEnumerable delimited by the separator string. If the given IEnumerable is empty, the method returns String.Empty.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.

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TakeUntil<T>(IEnumerable<T>, Func<T, Boolean>)

Takes items from the given IEnumerable until the first item matches the specified predicate.

Declaration

public static IEnumerable<T> TakeUntil<T>(this IEnumerable<T> enumerable, Func<T, bool> predicate)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable.
System.Func<T, TResult><T, System.Boolean>	predicate	The predicate.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>	Returns the items from the start of the IEnumerable until the first item matching the predicate.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.
System.ArgumentNullException	The predicate can not be null.

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ToDictionary<TKey, TValue>(IEnumerable<IGrouping<TKey, TValue>>)

Converts the IEnumerable containing the groupings into a Dictionary of those groupings.

Declaration

public static Dictionary<TKey, List<TValue>> ToDictionary<TKey, TValue>(this IEnumerable<IGrouping<TKey, TValue>> groupings)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><<TKey, TValue>>	groupings	The enumeration of groupings from a GroupBy() clause.

Returns

Type	Description
System.Collections.Generic.Dictionary<TKey, TValue><TKey, System.Collections.Generic.List<T><TValue>>	Returns a dictionary of groupings such that the key of the dictionary is TKey type and the value is List of TValue type.

Type Parameters

Name	Description
TKey	The type of the key.
TValue	The type of the items.

Exceptions

Type	Condition
System.ArgumentNullException	The groupings can not be null.

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ToObservableCollection<T>(IEnumerable<T>)

Converts the given IEnumerable to a ObservableCollection.

Declaration

public static ObservableCollection<T> ToObservableCollection<T>(this IEnumerable<T> enumerable)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The IEnumerable.

Returns

Type	Description
System.Collections.ObjectModel.ObservableCollection<T><T>	The given IEnumerable as ObservableCollection.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The enumerable can not be null.

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Where<T>(IEnumerable<T>, ISpecification<T>)

Returns all items of the given enumerable which satisfy the given specification.

Declaration

public static IEnumerable<T> Where<T>(this IEnumerable<T> enumerable, ISpecification<T> specification)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The enumerable.
ISpecification<T><T>	specification	The specification.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>	Returns the items which satisfy the given specification.

Type Parameters

Name	Description
T	The type of the item in the enumerable.

Exceptions

Type	Condition
System.ArgumentNullException	enumerable can not be null.
System.ArgumentNullException	specification can not be null.

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WhereIf<T>(IEnumerable<T>, Boolean, Func<T, Boolean>)

Performs a where predicate on the IEnumerable, if the given condition is true, otherwise returns all items of the IEnumerable.

Declaration

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

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	source	The IEnumerable containing the items.
System.Boolean	condition	The condition determining whether the where predicate gets applied or not.
System.Func<T, TResult><T, System.Boolean>	predicate	The where predicate.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>	Returns the result of the predicate if the condition is true, otherwise the source IEnumerable.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The source can not be null.
System.ArgumentNullException	The predicate can not be null.

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WhereIf<T>(IEnumerable<T>, Boolean, Func<T, Int32, Boolean>)

Performs a where predicate on the IEnumerable, if the given condition is true, otherwise returns all items of the IEnumerable.

Declaration

public static IEnumerable<T> WhereIf<T>(this IEnumerable<T> source, bool condition, Func<T, int, bool> predicate)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	source	The IEnumerable containing the items.
System.Boolean	condition	The condition determining whether the where predicate gets applied or not.
System.Func<T1, T2, TResult><T, System.Int32, System.Boolean>	predicate	The where predicate.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>	Returns the result of the predicate if the condition is true, otherwise the source IEnumerable.

Type Parameters

Name	Description
T	The type of the items in the IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	The source can not be null.
System.ArgumentNullException	The predicate can not be null.

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WhereNot<T>(IEnumerable<T>, ISpecification<T>)

Returns all items of the given enumerable which doesn't satisfy the given specification.

Declaration

public static IEnumerable<T> WhereNot<T>(this IEnumerable<T> enumerable, ISpecification<T> specification)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	enumerable	The enumerable.
ISpecification<T><T>	specification	The specification.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>	Returns the items which doesn't satisfy the given specification.

Type Parameters

Name	Description
T	The type of the item in the enumerable.

Exceptions

Type	Condition
System.ArgumentNullException	enumerable can not be null.
System.ArgumentNullException	specification can not be null.

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WithIndex<T>(IEnumerable<T>)

Associates an index to each element of the source IEnumerable.

Declaration

public static IEnumerable<IIndexedItem<T>> WithIndex<T>(this IEnumerable<T> source)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><T>	source	The source IEnumerable.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><IIndexedItem<T><T>>	A sequence of elements paired with their index in the sequence.

Type Parameters

Name	Description
T	The type of the items in the given IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	source can not be null.

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WithoutIndex<T>(IEnumerable<IIndexedItem<T>>)

Removes the indexes from a IEnumerable of indexed elements, returning only the elements themselves.

Declaration

public static IEnumerable<T> WithoutIndex<T>(this IEnumerable<IIndexedItem<T>> source)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<T><IIndexedItem<T><T>>	source	The IEnumerable to remove the indexes from.

Returns

Type	Description
System.Collections.Generic.IEnumerable<T><T>	A IEnumerable of elements without their associated indexes.

Type Parameters

Name	Description
T	The type of the items in the given IEnumerable.

Exceptions

Type	Condition
System.ArgumentNullException	source can not be null.