Last(TSource) Method (IQueryable(TSource), Expression(Func(TSource, Boolean)))

Queryable.Last<TSource> Method (IQueryable<TSource>, Expression<Func<TSource, Boolean>>)


Returns the last element of a sequence that satisfies a specified condition.

Namespace:   System.Linq
Assembly:  System.Core (in System.Core.dll)

public static TSource Last<TSource>(
	this IQueryable<TSource> source,
	Expression<Func<TSource, bool>> predicate


Type: System.Linq.IQueryable<TSource>

An IQueryable<T> to return an element from.

Type: System.Linq.Expressions.Expression<Func<TSource, Boolean>>

A function to test each element for a condition.

Return Value

Type: TSource

The last element in source that passes the test specified by predicate.

Type Parameters


The type of the elements of source.

Exception Condition

source or predicate is null.


No element satisfies the condition in predicate.


The source sequence is empty.

This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T, TResult> types. For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

The Last<TSource>(IQueryable<TSource>, Expression<Func<TSource, Boolean>>) method generates a MethodCallExpression that represents calling Last<TSource>(IQueryable<TSource>, Expression<Func<TSource, Boolean>>) itself as a constructed generic method. It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

The query behavior that occurs as a result of executing an expression tree that represents calling Last<TSource>(IQueryable<TSource>, Expression<Func<TSource, Boolean>>) depends on the implementation of the type of the source parameter. The expected behavior is that it returns the last element in source that satisfies the condition specified by predicate.

The following code example demonstrates how to use Last<TSource>(IQueryable<TSource>, Expression<Func<TSource, Boolean>>) to return the last element of an array that satisfies a condition.

int[] numbers = { 9, 34, 65, 92, 87, 435, 3, 54, 
                    83, 23, 87, 67, 12, 19 };

// Get the last number in the array that is greater than 80.
int last = numbers.AsQueryable().Last(num => num > 80);


    This code produces the following output:


Universal Windows Platform
Available since 4.5
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.1
Windows Phone
Available since 8.1
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