All C# extension methods for type ienumerable-t

• WhereIf

  When building a LINQ query, you may need to involve optional filtering criteria. Avoids if statements when building predicates & lambdas for a query. Useful when you don't know at compile time whether a filter should apply. Borrowed from Andrew Robinson. http://bit.ly/1V36G9

  C# System.Collections.Generic.IEnumerable<T> Phil Campbell Popular 41660 Views

• OrderBy(string sortExpression)

  Orders a list based on a sortexpression. Useful in object databinding scenarios where the objectdatasource generates a dynamic sortexpression (example: "Name desc") that specifies the property of the object sort on.

  C# System.Collections.Generic.IEnumerable<T> C.F.Meijers Popular 28642 Views

• ForEach

  Shortcut for foreach and create new list

  C# System.Collections.Generic.IEnumerable<T> Pedram Jabbari Popular 23987 Views

• Pivot

  Groups the elements of a sequence according to a specified firstKey selector function and rotates the unique values from the secondKey selector function into multiple values in the output, and performs aggregations.

  C# System.Collections.Generic.IEnumerable<T> Fons Sonnemans Popular 23013 Views

• ToDataTable

  Converts an IEnumerable to DataTable (supports nullable types) adapted from http://www.c-sharpcorner.com/UploadFile/VIMAL.LAKHERA/LINQResultsetToDatatable06242008042629AM/LINQResultsetToDatatable.aspx

  C# System.Collections.Generic.IEnumerable<T> Ewerton Luis de Mattos Popular 19420 Views

• ToObservableCollection<T>()

  Convert a IEnumerable<T> to a ObservableCollection<T> and can be used in XAML (Silverlight and WPF) projects

  C# System.Collections.Generic.IEnumerable<T> Fons Sonnemans Popular 16558 Views

• IsNotNullOrEmpty

  It returns false if given collection is null or empty otherwise it returns true.

  C# System.Collections.Generic.IEnumerable<T> Omkar Panhalkar Popular 14159 Views

• Randomize

  OrderBy() is nice when you want a consistent & predictable ordering. This method is NOT THAT! Randomize() - Use this extension method when you want a different or random order every time! Useful when ordering a list of things for display to give each a fair chance of landing at the top or bottom on each hit. {customers, support techs, or even use as a randomizer for your lottery ;) }

  C# System.Collections.Generic.IEnumerable<T> Phil Campbell Popular 13335 Views

• ForEach

  Shortcut for foreach

  C# System.Collections.Generic.IEnumerable<T> Jeroen de Zeeuw, Rob van Lanen Popular 13111 Views

• IndexOf<T>()

  Returns the index of the first occurrence in a sequence by using the default equality comparer or a specified one.

  C# System.Collections.Generic.IEnumerable<T> Fons Sonnemans Popular 13000 Views

• ToCSV

  An extension method that produce a comman separated values of string out of an IEnumerable<T>. This would be useful if you want to automatically generate a CSV out of integer, string, or any other primative data type collection or array. I provided 2 overloads of this method. One of them accepts a separator and the other uses comma "," as default separator. Also I am using another shortcut extension method for foreach loop.

  C# System.Collections.Generic.IEnumerable<T> Muhammad Mosa Popular 12684 Views

• ToCollection<T>()

  Convert a IEnumerable<T> to a Collection<T>

  C# System.Collections.Generic.IEnumerable<T> Dawid van Zyl Popular 12562 Views

• Shuffle

  Shuffles an IEnumerable list

  C# System.Collections.Generic.IEnumerable<T> Wes Caldwell Popular 12262 Views

• OrderBy

  OrderBy is nice, except if you want to sort by multiple properties or want an easy way to distinguish between ascending and descending.

  C# System.Collections.Generic.IEnumerable<T> Adam Weigert Popular 12235 Views

• Slice<T>(int start, int end)

  Returns the range of elements between the specified start and end indexes. Negative numbers count from the end, rather than the start, of the sequence. Values of 'end' larger than the actual sequence are truncated and do not cause index-out-of-bounds exceptions. Functionally very similar to Python's list[x:y] slices.

  C# System.Collections.Generic.IEnumerable<T> Joe Smith Popular 11913 Views

• Transpose

  transposes the rows and columns of its argument

  C# System.Collections.Generic.IEnumerable<T> Edmondo Pentangelo Popular 11843 Views

• Distinct

  Provides a Distinct method that takes a key selector lambda as parameter. The .net framework only provides a Distinct method that takes an instance of an implementation of IEqualityComparer<T> where the standard parameterless Distinct that uses the default equality comparer doesn't suffice.

  C# System.Collections.Generic.IEnumerable<T> Martin Rosén-Lidholm Popular 11698 Views

• ToHashSet<T>

  Takes any IEnumerable<T> and converts it to a HashSet<T>

  C# System.IEnumerable<T> FloppyMan Popular 11426 Views

• Each<T>

  iterates through an IEnumerable<T> and applies an Action

  C# System.Collections.Generic.IEnumerable<T> Jon Erickson Popular 10453 Views

• ToString

  Concatenates a specified separator String between each element of a specified enumeration, yielding a single concatenated string.

  C# System.Collections.Generic.IEnumerable<T> Fons Sonnemans Popular 10083 Views

• Cache()

  Caches the results of an IEnumerable.

  C# System.Collections.Generic.IEnumerable<T> YellPika Popular 9828 Views

• Split

  somtimes one needs to split a larger collection into multiple smaller ones, this one does so use deferred execution

  C# System.Collections.Generic.IEnumerable<T> Eckhard Schwabe Popular 9466 Views

• TakeUntil

  The opposite of TakeWhile, inverts the expression and passes to TakeWhile so that instead of taking while an expression is true, you take until an expression is true.

  C# System.Collections.Generic.IEnumerable<T> James Michael Hare (BlackRabbitCoder) Popular 9299 Views

• FirstOrNull

  Returns the null when there's null first element in the sequence instead of throwing an exception

  C# System.Collections.Generic.IEnumerable<T> Jason Briggs Popular 9236 Views

• SelectRandom

  This method selects a random element from an Enumerable with only one pass (O(N) complexity). It contains optimizations for argumens that implement ICollection<T> by using the Count property and the ElementAt LINQ method. The ElementAt LINQ method itself contains optimizations for IList<T>

  C# System.Collections.Generic.IEnumerable<T> Stilgar Popular 8899 Views

• Filter

  Allows you to filter an IEnumerable<T>

  C# System.Collections.Generic.IEnumerable<T> Jeff Reddy Popular 8502 Views

• Combinations

  Returns all combinations of a chosen amount of selected elements in the sequence.

  C# System.IEnumerable<T> Steven Jeuris Popular 8450 Views

• Aggregate

  Since System.Linq.Enumerable.Aggregate throws a System.InvalidOperationException in case the given list is empty you can't use this function in a complex linq expression. This aggregate version simply returns a defaultvalue if the list is empty

  C# System.Collections.Generic.IEnumerable<T> RW Popular 8108 Views

• IsNullOrEmpty

  Determines whether a collection is null or has no elements without having to enumerate the entire collection to get a count.

  C# System.Collection.Generic.IEnumerable<T> Kelly Adams 7998 Views

• Async

  Starts execution of IQueryable on a ThreadPool thread and returns immediately with a "end" method to call once the result is needed.

  C# System.Collections.Generic.IEnumerable<T> ulrikb.worldpress.com 7594 Views

• Slice of IEnumerable

  Returns count elements, beginning from the specified

  C# System.Collections.Generic.IEnumerable<T> Sergei Bogachev 7005 Views

• Reverse

  Reverses the order of the list that you wish to enumerate.

  C# System.IEnumerable<T> Jonathan Crossland 6865 Views

• ToCsv

  Returns a string that represent a csv representation of the referenced T in the IEnumerable<T>. You can also generate a columns header (the first row) with the name of the serialized properties. You can specify the name of the properties to include in the csv file. If you don't specify anything it will includes all the public properties.

  C# System.Collection.Generic.IEnumerable<T> Lorenzo Melato 6603 Views

• Concat

  Adds an element to an IEnumerable (System.Linq.Concat only adds multiple elements)

  C# System.Collections.IEnumerable<T> B.W. Kemps 6397 Views

• ToHtmlTable

  Converts an IEnumberable<T> to an HTML DataTable.

  C# System.Collections.Generic.IEnumerable<T> Alex Friedman 6316 Views

• Zip

  Merges three sequences by using the specified predicate function.

  C# System.IEnumerable<T> Steven Jeuris 6256 Views

• FirstIndex() and LastIndex()

  Finds the index of the first of last occurence which matches the predicate.

  C# System.Collections.Generic.IEnumerable<T> Fons Sonnemans 6099 Views

• GetPermutations

  GetPermutations

  C# System.Collection.Generic.IEnumerable<T> Fons Sonnemans 6061 Views

• None(), OneOf(), Many(), XOf()

  Count-based extensions which make checking the length of something more readable. * Updated on 2010-01-16 following suggestion from @Sane regarding the use of Count() in None(). Switched to Any(). Thanks!

  C# System.Collections.Generic.IEnumerable<T> Dan Atkinson 5945 Views

• IsNullOrEmpty

  Check whether a collection is null or doesn't contain any elements.

  C# System.Collection.Generic.IEnumerable<T> Dimaz Pramudya 5800 Views

• IndexOf

  Gets the index of the give value in a collection. Is overloaded to take a start parameter as well.

  C# System.Collections.Generic.IEnumerable<T> Daniel Gidman 5710 Views

• IsSingle

  Determines whether the collection has exactly one element

  C# System.Collections.Generic.IEnumerable<T> Brian Dukes 5684 Views

• WriteToConsole

  Write all elements in the Enumeration to the Console

  C# System.Collections.Generic.IEnumerable<T> Fons Sonnemans 5551 Views

• Convert

  Converts from one type to another.

  C# System.Collections.Generic.IEnumerable<T> Adam Weigert 5483 Views

• Sort algorithms

  This is a set of extesion methods that sort a given list more about that on codeplex

  C# System.Collection.Generic.IEnumerable<T> Tunisian 5421 Views

• IsNullOrEmpty

  Checks if the collection is null or empty

  C# System.Collections.Generic.IEnumerable<T> Linquize 5392 Views

• CountOf

  Returns whether the sequence contains a certain amount of elements, without having to traverse the entire collection.

  C# System.IEnumerable<T> Steven Jeuris 5381 Views

• ForEach

  Foreach inline for the IEnumerable<T>.

  C# System.Collections.Generic.IEnumerable<T> Leandro Boffi 5342 Views

• DefaultIfEmpty

  The provided DefaultIfEmpty will only accept an instance of T as the default value. Sometimes you need the default to be an IEnumerable<T>.

  C# System.Collections.Generic.IEnumerable<T> ThatChuckGuy 5336 Views

• join

  --

  C# System.Collections.Generic.IEnumerable<T> Thomas Kowalski 5284 Views

• CloneExplicit<T>

  Creates an explicit copy of the given enumerable where the only values copied are the ones you designate.

  C# System.Collections.Generic.IEnumerable<T> Daniel Gidman 5249 Views

• FindMin() and FindMax()

  Selects the object in a list with the minimum or maximum value on a particular property

  C# System.Collections.Generic.IEnumerable<T> Fons Sonnemans 5240 Views

• SplitUp()

  This SplitUp() extension method takes a sequence and splits it up into subsequences that each have a maximum length. See http://peshir.blogspot.nl/2011/02/example-of-c-lazy-functional.html for more information.

  C# System.Collections.Generic.IEnumerable<T> peSHIr 5134 Views

• bool IsSorted (Comparison<T> comparison)

  returns true if a sequence is sorted

  C# System.Collections.Generic.IEnumerable<T> Piers Haken 5025 Views

• IndicesOf

  Finds all the indexes of the give value or values in an enumerable list

  C# System.Collections.Generic.IEnumerable<T> Daniel Gidman 5022 Views

• ToObservableCollection<T>()

  Convert a IEnumerable<T> to a ObservableCollection<T> and can be used in XAML (WPF, Silverlight, Windows Phone & Windows Store) projects

  C# System.Collections.Generic.IEnumerable<T> Farhan Ghumra 5019 Views

• ConcatTo

  Adds a single element at the beginning of an enumerator

  C# System.Collections.IEnumerable<T> B.W. Kemps 5015 Views

• SkipLast

  take all but the last item from an IEnumerable<T>

  C# System.Collections.Generic.IEnumerable<T> Clinton Sheppard 5005 Views

• Product

  Computes a product of all elements in the sequence.

  C# System.Collections.Generic.IEnumerable<T> Edmondo Pentangelo 5000 Views

• CacheGeneratedResults

  Caches the results of generator methods so that expensive enumerations are not repeated if they are enumerated multiple times. Yet it caches the results lazily, allowing for memory efficiency where possible.

  C# System.Collections.Generic.IEnumerable<T> Andrew Arnott 4997 Views

• ToObservableCollection

  Copies elements from IEnumerable<T> into ObservableCollection<T>. Handy for converting LINQ results into a list appropriate for WPF databinding.

  C# System.Collections.Generic.IEnumerable<T> Matt Nicholson 4951 Views

• Convert

  Converts all elements in an enumerable list from the its to a destination type by calling a provided conversion function

  C# System.Collections.Generic.IEnumerable<T> Ricardo Peres 4942 Views

• RandomElements

  Returns a number of random elements from a collection

  C# System.Collections.Generic.IEnumerable<T> Timmy Kokke 4933 Views

• WrapEachWithTag

  Creates a string that is each the elements' ToString() values wrapped in the 'tag' that is passed as a param. Good for converting an IEnum<T> into a block of HTML/XML.

  C# System.Collections.Generic.IEnumerable<T> Graham Peel 4820 Views

• Cycle

  Repeats a sequence forever.

  C# System.Collections.Generic.IEnumerable<T> Daniel Pratt 4803 Views

• ThrowIfAny

  Throws a given exception is any value in a set passes a given predicate

  C# System.Collection.Generic.IEnumerable<T> Adam 4796 Views

• In

  Filters a list based on a comma-separated list of allowed values. This is a lot more concise than using a number of 'or' clauses

  C# System.Collections.Generic.IEnumerable<T> Chris Meijers 4747 Views

• Each

  Iterates over all the elements in a collection and performs the given action, usually given as a lambda.

  C# System.IEnumerable<T> Ricardo Amores Hernández 4627 Views

• Randomize

  Randomizes am IEnumerable<T>

  C# System.Collections.Generic.IEnumerable<T> Joe 4600 Views

• In

  Determines whether a variable of type T is contained in the supplied list of arguments of type T, allowing for more concise code.

  C# System.Collections.Generic.IEnumerable<T> Winston Smith 4520 Views

• WhereNotNull

  I’m a big fan of the Nullable Reference Types feature added in C# 8.0. It lets the compiler catch a bunch of potential runtime errors, and I guarantee if you turn it on you’ll get a bunch of warnings. As of .NET 5.0, the entire BCL is now covered with nullable annotations, and a lot of the extended ecosystem supports them too. But there are situations where the compiler is unable to work out that you’ve done a null check, meaning you either have to use the “null-forgiving operator” (where you append a bang to the identifier, like item!.Name), disable the null checking, or just ignore the warning. The WhereNotNull extension method filters out nulls and changes the expression type accordingly. source: https://rendle.dev/posts/where-not-null/

  csharp ienumerable-t Mark Rendle 4513 Views

• ToList(capacity)

  LINQ ToList() extension method with an extra capacity argument. This can boost the speed of creating the list.

  csharp ienumerable-t Fons Sonnemans 4437 Views

• WherePrevious

  Compare Through a predicate every element of a list with the previous one

  C# System.Collections.Generic.IEnumerable<T> Emanuele Rossi 4433 Views

• AsNullSafeEnumerable

  You don't need check whether the collection is null.

  C# System.Collections.Generic.IEnumerable<T> Rrr 4402 Views

• Cached

  Cache result of IEnumerable iteration. Similar to other implemetations with two advantages: 1 - Not flawed (Dispose of IEnumerator done by compiler) 2- Simplier

  C# IEnumerable<T> beppemarazzi 4401 Views

• Follow

  Follows sequence with new element

  C# IEnumerable<T> Nikoloz Pachuashvili 3905 Views

• Penultimate

  Gets the penultimate item of a collection

  csharp ienumerable-t Lu.Ca 3745 Views

• FillSpan

  Fill any Span using an IEnumerable. Returns the number of items which are placed in the Span.

  csharp ienumerable-t Fons Sonnemans 3574 Views

• FastSum

  Sum decimals

  csharp IEnumerable<T> unknow 3277 Views

• TryGetNonEnumeratedCount

  Attempts to determine the number of elements in a sequence without forcing an enumeration. For those who are not yet using .NET 6

  csharp System.Collections.Generic.IEnumerable<T> Bartosz Adamczewski 2945 Views

• AnyAndAll

  Determines whether a sequence contains any elements and whether all elements of a sequence satisfy a condition. The normal 'All' method returns true when the sequence is empty.

  csharp System.Collections.Generic.IEnumerable<T> Fons Sonnemans 2489 Views

• EnumerateWithIndex<T>()

  Enumerate an IEnumerable<T> source and getting the Index and the Item returned in a ValueTuple.

  csharp System.Collections.Generic.IEnumerable<T> Fons Sonnemans 2343 Views

• SkipFrom

  Bypasses a specified number of elements in a sequence from a given start position

  csharp ienumerable-t Fons Sonnemans 671 Views