Element Operations (Visual Basic)

Element operations return a single, specific element from a sequence.

The standard query operator methods that perform element operations are listed in the following section.

Methods

Method Name	Description	Visual Basic Query Expression Syntax	More Information
ElementAt	Returns the element at a specified index in a collection.	Not applicable.	Enumerable.ElementAt Queryable.ElementAt
ElementAtOrDefault	Returns the element at a specified index in a collection or a default value if the index is out of range.	Not applicable.	Enumerable.ElementAtOrDefault Queryable.ElementAtOrDefault
First	Returns the first element of a collection, or the first element that satisfies a condition.	Not applicable.	Enumerable.First Queryable.First
FirstOrDefault	Returns the first element of a collection, or the first element that satisfies a condition. Returns a default value if no such element exists.	Not applicable.	Enumerable.FirstOrDefault Queryable.FirstOrDefault Queryable.FirstOrDefault<TSource>(IQueryable<TSource>)
Last	Returns the last element of a collection, or the last element that satisfies a condition.	Not applicable.	Enumerable.Last Queryable.Last
LastOrDefault	Returns the last element of a collection, or the last element that satisfies a condition. Returns a default value if no such element exists.	Not applicable.	Enumerable.LastOrDefault Queryable.LastOrDefault
Single	Returns the only element of a collection, or the only element that satisfies a condition.	Not applicable.	Enumerable.Single Queryable.Single
SingleOrDefault	Returns the only element of a collection, or the only element that satisfies a condition. Returns a default value if no such element exists or the collection does not contain exactly one element.	Not applicable.	Enumerable.SingleOrDefault Queryable.SingleOrDefault

See also

• System.Linq
• Standard Query Operators Overview (Visual Basic)
• How to: Query for the Largest File or Files in a Directory Tree (LINQ) (Visual Basic)