Enumerable.ToArray<TSource>(IEnumerable<TSource>) メソッド

  • リファレンス

定義

名前空間:
System.Linq
アセンブリ:
System.Linq.dll
アセンブリ:
System.Core.dll
アセンブリ:
netstandard.dll
ソース:
ToCollection.cs
ソース:
ToCollection.cs
ソース:
ToCollection.cs

IEnumerable<T> から配列を作成します。

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

型パラメーター

TSource

source の要素の型。

パラメーター

source
IEnumerable<TSource>

配列の作成元の IEnumerable<T>。

戻り値

TSource[]

入力シーケンスの要素を含む配列。

例外

ArgumentNullException

source が nullです。

例

次のコード例では、 を使用 ToArray してクエリの即時評価を強制し、結果の配列を返す方法を示します。

class Package
{
    public string Company { get; set; }
    public double Weight { get; set; }
}

public static void ToArrayEx1()
{
    List<Package> packages =
        new List<Package>
            { new Package { Company = "Coho Vineyard", Weight = 25.2 },
              new Package { Company = "Lucerne Publishing", Weight = 18.7 },
              new Package { Company = "Wingtip Toys", Weight = 6.0 },
              new Package { Company = "Adventure Works", Weight = 33.8 } };

    string[] companies = packages.Select(pkg => pkg.Company).ToArray();

    foreach (string company in companies)
    {
        Console.WriteLine(company);
    }
}

/*
 This code produces the following output:

 Coho Vineyard
 Lucerne Publishing
 Wingtip Toys
 Adventure Works
*/

Structure Package
    Public Company As String
    Public Weight As Double
End Structure

Sub ToArrayEx1()
    ' Create a list of Package values.
    Dim packages As New List(Of Package)(New Package() _
     {New Package With {.Company = "Coho Vineyard", .Weight = 25.2},
      New Package With {.Company = "Lucerne Publishing", .Weight = 18.7},
      New Package With {.Company = "Wingtip Toys", .Weight = 6.0},
      New Package With {.Company = "Adventure Works", .Weight = 33.8}})

    ' Project the Company values from each item in the list
    ' and put them into an array.
    Dim companies() As String =
    packages _
    .Select(Function(pkg) pkg.Company) _
    .ToArray()

    ' Display the results.
    Dim output As New System.Text.StringBuilder
    For Each company As String In companies
        output.AppendLine(company)
    Next
    Console.WriteLine(output.ToString())
End Sub

' This code produces the following output:
'
' Coho Vineyard
' Lucerne Publishing
' Wingtip Toys
' Adventure Works

注釈

メソッドは ToArray<TSource>(IEnumerable<TSource>) 、クエリの即時評価を強制し、クエリ結果を含む配列を返します。 クエリ結果のキャッシュされたコピーを取得するために、このメソッドをクエリに追加できます。

ToList は同様の動作をしますが、配列の代わりに を返します List<T> 。

適用対象