# Enumerable.Any 方法

## 多載

 Any(IEnumerable) 判斷序列是否包含任何項目。 Any(IEnumerable, Func) 判斷序列的任何項目是否符合條件。

## Any<TSource>(IEnumerable<TSource>)

``````public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
static bool Any(System::Collections::Generic::IEnumerable<TSource> ^ source);``````
``public static bool Any<TSource> (this System.Collections.Generic.IEnumerable<TSource> source);``
``static member Any : seq<'Source> -> bool``
``````<Extension()>
Public Function Any(Of TSource) (source As IEnumerable(Of TSource)) As Boolean``````

#### 類型參數

TSource

`source` 項目的類型。

#### 參數

source
IEnumerable<TSource>

Boolean

#### 例外狀況

`source``null`

### 範例

``````List<int> numbers = new List<int> { 1, 2 };
bool hasElements = numbers.Any();

Console.WriteLine("The list {0} empty.",
hasElements ? "is not" : "is");

// This code produces the following output:
//
// The list is not empty.
``````
``````' Create a list of Integers.
Dim numbers As New List(Of Integer)(New Integer() {1, 2})

' Determine if the list contains any items.
Dim hasElements As Boolean = numbers.Any()

' Display the output.
Dim text As String = IIf(hasElements, "not ", "")
Console.WriteLine(\$"The list is {text}empty.")

' This code produces the following output:
'
' The list is not empty.
``````

``````class Pet
{
public string Name { get; set; }
public int Age { get; set; }
}
class Person
{
public string LastName { get; set; }
public Pet[] Pets { get; set; }
}

public static void AnyEx2()
{
List<Person> people = new List<Person>
{ new Person { LastName = "Haas",
Pets = new Pet[] { new Pet { Name="Barley", Age=10 },
new Pet { Name="Boots", Age=14 },
new Pet { Name="Whiskers", Age=6 }}},
new Person { LastName = "Fakhouri",
Pets = new Pet[] { new Pet { Name = "Snowball", Age = 1}}},
new Person { LastName = "Antebi",
Pets = new Pet[] { }},
new Person { LastName = "Philips",
Pets = new Pet[] { new Pet { Name = "Sweetie", Age = 2},
new Pet { Name = "Rover", Age = 13}} }
};

// Determine which people have a non-empty Pet array.
IEnumerable<string> names = from person in people
where person.Pets.Any()
select person.LastName;

foreach (string name in names)
{
Console.WriteLine(name);
}

/* This code produces the following output:

Haas
Fakhouri
Philips
*/
}
``````
``````Structure Pet
Public Name As String
Public Age As Integer
End Structure

Structure Person
Public LastName As String
Public Pets() As Pet
End Structure

Sub AnyEx2()
Dim people As New List(Of Person)(New Person() _
{New Person With {.LastName = "Haas",
.Pets = New Pet() {New Pet With {.Name = "Barley", .Age = 10},
New Pet With {.Name = "Boots", .Age = 14},
New Pet With {.Name = "Whiskers", .Age = 6}}},
New Person With {.LastName = "Fakhouri",
.Pets = New Pet() {New Pet With {.Name = "Snowball", .Age = 1}}},
New Person With {.LastName = "Antebi",
.Pets = New Pet() {}},
New Person With {.LastName = "Philips",
.Pets = New Pet() {New Pet With {.Name = "Sweetie", .Age = 2},
New Pet With {.Name = "Rover", .Age = 13}}}})

' Determine which people have a non-empty Pet array.
Dim names = From person In people
Where person.Pets.Any()
Select person.LastName

For Each name As String In names
Console.WriteLine(name)
Next

' This code produces the following output:
'
' Haas
' Fakhouri
' Philips

End Sub
``````

## Any<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

``````public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
static bool Any(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, bool> ^ predicate);``````
``public static bool Any<TSource> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,bool> predicate);``
``static member Any : seq<'Source> * Func<'Source, bool> -> bool``
``````<Extension()>
Public Function Any(Of TSource) (source As IEnumerable(Of TSource), predicate As Func(Of TSource, Boolean)) As Boolean``````

#### 類型參數

TSource

`source` 項目的類型。

#### 參數

source
IEnumerable<TSource>

predicate
Func<TSource,Boolean>

Boolean

#### 例外狀況

`source``predicate``null`

### 範例

``````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 Pets.
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.Any(p => p.Age > 1 && p.Vaccinated == false);

Console.WriteLine(
"There {0} unvaccinated animals over age one.",
unvaccinated ? "are" : "are not any");
}

// This code produces the following output:
//
//  There are unvaccinated animals over age one.
``````
``````Structure Pet
Public Name As String
Public Age As Integer
Public Vaccinated As Boolean
End Structure

Shared Sub AnyEx3()
' Create a list of Pets
Dim pets As New List(Of Pet)(New Pet() _
{New Pet With {.Name = "Barley", .Age = 8, .Vaccinated = True},
New Pet With {.Name = "Boots", .Age = 4, .Vaccinated = False},
New Pet With {.Name = "Whiskers", .Age = 1, .Vaccinated = False}})

' Determine whether any pets over age 1 are also unvaccinated.
Dim unvaccinated As Boolean =
pets.Any(Function(pet) pet.Age > 1 And pet.Vaccinated = False)

' Display the output.
Dim text As String = IIf(unvaccinated, "are", "are not")
Console.WriteLine(\$"There {text} unvaccinated animals over age 1.")
End Sub

' This code produces the following output:
'
' There are unvaccinated animals over age 1.
``````