Queryable.Any(TSource) Method (IQueryable(TSource), Expression(Func(TSource, Boolean)))

Determines whether any element of a sequence satisfies a condition.

Namespace:  System.Linq
Assemblies:   System.Linq.Queryable (in System.Linq.Queryable.dll)
  System.Core (in System.Core.dll)

static member Any : 
        source:IQueryable<'TSource> * 
        predicate:Expression<Func<'TSource, bool>> -> bool

Type Parameters

TSource

The type of the elements of source.

Parameters

source
Type: System.Linq.IQueryable(TSource)

A sequence whose elements to test for a condition.

predicate
Type: System.Linq.Expressions.Expression(Func(TSource, Boolean))

A function to test each element for a condition.

Return Value

Type: System.Boolean
true if any elements in the source sequence pass the test in the specified predicate; otherwise, false.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IQueryable(TSource). When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

ExceptionCondition
ArgumentNullException

source or predicate is a null reference (Nothing in Visual Basic).

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 Any(TSource)(IQueryable(TSource), Expression(Func(TSource, Boolean))) method generates a MethodCallExpression that represents calling Any(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 Any(TSource)(IQueryable(TSource), Expression(Func(TSource, Boolean))) depends on the implementation of the type of the source parameter. The expected behavior is that it determines if any of the elements of source satisfy the condition specified by predicate.

The following code example demonstrates how to use Any(TSource)(IQueryable(TSource), Expression(Func(TSource, Boolean))) to determine whether any element in a sequence satisfies a condition.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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