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

Determines whether any element of a sequence satisfies a condition.

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

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

Type Parameters


The type of the elements of source.


Type: System.Linq.IQueryable<TSource>
A sequence whose elements to test for a condition.
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.


source or predicate is null.

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.

         class Pet
            public string Name { get; set; }
            public int Age { get; set; }
            public bool Vaccinated { get; set; }

         public static void AnyEx3()
            // Create an array of Pet objects.
            Pet[] pets =
                    { new Pet { Name="Barley", Age=8, Vaccinated=true },
                      new Pet { Name="Boots", Age=4, Vaccinated=false },
                      new Pet { Name="Whiskers", Age=1, Vaccinated=false } };

            // Determine whether any pets over age 1 are also unvaccinated.
            bool unvaccinated =
                pets.AsQueryable().Any(p => p.Age > 1 && p.Vaccinated == false);

            outputBlock.Text += String.Format(
                "There {0} unvaccinated animals over age one.",
                unvaccinated ? "are" : "are not any") + "\n";

         // This code produces the following output:
         //  There are unvaccinated animals over age one. 


Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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