Enumerable.Concat<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) Yöntem

Tanım

İki diziyi art arda ekler.Concatenates two sequences.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static System::Collections::Generic::IEnumerable<TSource> ^ Concat(System::Collections::Generic::IEnumerable<TSource> ^ first, System::Collections::Generic::IEnumerable<TSource> ^ second);
public static System.Collections.Generic.IEnumerable<TSource> Concat<TSource> (this System.Collections.Generic.IEnumerable<TSource> first, System.Collections.Generic.IEnumerable<TSource> second);
static member Concat : seq<'Source> * seq<'Source> -> seq<'Source>
<Extension()>
Public Function Concat(Of TSource) (first As IEnumerable(Of TSource), second As IEnumerable(Of TSource)) As IEnumerable(Of TSource)

Tür Parametreleri

TSource

Giriş sıralarının öğelerinin türü.The type of the elements of the input sequences.

Parametreler

first
IEnumerable<TSource>

Birleştirilecek ilk sıra.The first sequence to concatenate.

second
IEnumerable<TSource>

İlk diziye bitişme sırası.The sequence to concatenate to the first sequence.

Döndürülenler

IEnumerable<TSource>

IEnumerable<T>İki giriş dizisinin birleştirilmiş öğelerini içeren bir.An IEnumerable<T> that contains the concatenated elements of the two input sequences.

Özel durumlar

first ya second da null .first or second is null.

Örnekler

Aşağıdaki kod örneği, Concat<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) iki diziyi birleştirmek için nasıl kullanılacağını gösterir.The following code example demonstrates how to use Concat<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) to concatenate two sequences.

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

static Pet[] GetCats()
{
    Pet[] cats = { new Pet { Name="Barley", Age=8 },
                   new Pet { Name="Boots", Age=4 },
                   new Pet { Name="Whiskers", Age=1 } };
    return cats;
}

static Pet[] GetDogs()
{
    Pet[] dogs = { new Pet { Name="Bounder", Age=3 },
                   new Pet { Name="Snoopy", Age=14 },
                   new Pet { Name="Fido", Age=9 } };
    return dogs;
}

public static void ConcatEx1()
{
    Pet[] cats = GetCats();
    Pet[] dogs = GetDogs();

    IEnumerable<string> query =
        cats.Select(cat => cat.Name).Concat(dogs.Select(dog => dog.Name));

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

// This code produces the following output:
//
// Barley
// Boots
// Whiskers
// Bounder
// Snoopy
// Fido
Structure Pet
    Public Name As String
    Public Age As Integer
End Structure

' Returns an array of Pet objects.
Function GetCats() As Pet()
    Dim cats() As Pet = {New Pet With {.Name = "Barley", .Age = 8},
                 New Pet With {.Name = "Boots", .Age = 4},
                 New Pet With {.Name = "Whiskers", .Age = 1}}

    Return cats
End Function

' Returns an array of Pet objects.
Function GetDogs() As Pet()
    Dim dogs() As Pet = {New Pet With {.Name = "Bounder", .Age = 3},
                 New Pet With {.Name = "Snoopy", .Age = 14},
                 New Pet With {.Name = "Fido", .Age = 9}}
    Return dogs
End Function

Sub ConcatEx1()
    ' Create two arrays of Pet objects.
    Dim cats() As Pet = GetCats()
    Dim dogs() As Pet = GetDogs()

    ' Project the Name of each cat and concatenate
    ' the collection of cat name strings with a collection
    ' of dog name strings.
    Dim query As IEnumerable(Of String) =
cats _
.Select(Function(cat) cat.Name) _
.Concat(dogs.Select(Function(dog) dog.Name))

    Dim output As New System.Text.StringBuilder
    For Each name As String In query
        output.AppendLine(name)
    Next

    ' Display the output.
    Console.WriteLine(output.ToString())
End Sub

' This code produces the following output:
'
' Barley
' Boots
' Whiskers
' Bounder
' Snoopy
' Fido

İki diziyi bitişmenin alternatif bir yolu, bir koleksiyon (örneğin, dizi dizileri) oluşturmak ve ardından SelectMany yöntemi, kimlik Seçicisi işlevine geçirmek için kullanılır.An alternative way of concatenating two sequences is to construct a collection, for example an array, of sequences and then apply the SelectMany method, passing it the identity selector function. Aşağıdaki örnekte bu kullanımı gösterilmektedir SelectMany .The following example demonstrates this use of SelectMany.

Pet[] cats = GetCats();
Pet[] dogs = GetDogs();

IEnumerable<string> query =
    new[] { cats.Select(cat => cat.Name), dogs.Select(dog => dog.Name) }
    .SelectMany(name => name);

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

// This code produces the following output:
//
// Barley
// Boots
// Whiskers
// Bounder
// Snoopy
// Fido
    ' Create two arrays of Pet objects.
    Dim cats() As Pet = GetCats()
    Dim dogs() As Pet = GetDogs()

    ' Create an IEnumerable collection that contains two elements.
    ' Each element is an array of Pet objects.
    Dim animals() As IEnumerable(Of Pet) = {cats, dogs}

    Dim query As IEnumerable(Of String) =
(animals.SelectMany(Function(pets) _
                        pets.Select(Function(pet) pet.Name)))

    Dim output As New System.Text.StringBuilder
    For Each name As String In query
        output.AppendLine(name)
    Next

    ' Display the output.
    Console.WriteLine(output.ToString())

    ' This code produces the following output:
    '
    ' Barley
    ' Boots
    ' Whiskers
    ' Bounder
    ' Snoopy
    ' Fido

Açıklamalar

Bu yöntem ertelenmiş yürütme kullanılarak uygulanır.This method is implemented by using deferred execution. Anında dönüş değeri, eylemi gerçekleştirmek için gereken tüm bilgileri depolayan bir nesnedir.The immediate return value is an object that stores all the information that is required to perform the action. Bu yöntem tarafından temsil edilen sorgu, nesne GetEnumerator yöntemi doğrudan çağırarak ya da foreach Visual C# ' de veya Visual Basic kullanılarak numaralandırılana kadar yürütülmez For Each .The query represented by this method is not executed until the object is enumerated either by calling its GetEnumerator method directly or by using foreach in Visual C# or For Each in Visual Basic.

Yöntemi, Concat<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) Union Concat<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) giriş dizilerinde tüm özgün öğeleri döndürdüğünden yöntemi yönteminden farklıdır.The Concat<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) method differs from the Union method because the Concat<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) method returns all the original elements in the input sequences. UnionYöntemi yalnızca benzersiz öğeleri döndürür.The Union method returns only unique elements.

Şunlara uygulanır