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Enumerable.Count<TSource> Method (IEnumerable<TSource>, Func<TSource, Boolean>)

Returns a number that represents how many elements in the specified sequence satisfy a condition.

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

public static int Count<TSource>(
	this IEnumerable<TSource> source,
	Func<TSource, bool> predicate
)

Type Parameters

TSource

The type of the elements of source.

Parameters

source
Type: System.Collections.Generic.IEnumerable<TSource>

A sequence that contains elements to be tested and counted.

predicate
Type: System.Func<TSource, Boolean>

A function to test each element for a condition.

Return Value

Type: System.Int32
A number that represents how many elements in the sequence satisfy the condition in the predicate function.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<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 null.

OverflowException

The number of elements in source is larger than MaxValue.

If the type of source implements ICollection<T>, that implementation is used to obtain the count of elements. Otherwise, this method determines the count.

You should use the LongCount method when you expect and want to allow the result to be greater than MaxValue.

In Visual Basic query expression syntax, an Aggregate Into Count() clause translates to an invocation of Count.

The following code example demonstrates how to use Count<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>) to count the elements in an array that satisfy a condition.

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

            public static void CountEx2()
            {
                Pet[] pets = { new Pet { Name="Barley", Vaccinated=true },
                               new Pet { Name="Boots", Vaccinated=false },
                               new Pet { Name="Whiskers", Vaccinated=false } };

                try
                {
                    int numberUnvaccinated = pets.Count(p => p.Vaccinated == false);
                    Console.WriteLine("There are {0} unvaccinated animals.", numberUnvaccinated);
                }
                catch (OverflowException)
                {
                    Console.WriteLine("The count is too large to store as an Int32.");
                    Console.WriteLine("Try using the LongCount() method instead.");
                }
            }

            // This code produces the following output: 
            // 
            // There are 2 unvaccinated animals.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0

.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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