Type.IsLayoutSequential プロパティ


現在の型のフィールドが、定義済みまたはメタデータに対して出力された順序で、連続して配置されているかどうかを示す値を取得します。Gets a value indicating whether the fields of the current type are laid out sequentially, in the order that they were defined or emitted to the metadata.

 property bool IsLayoutSequential { bool get(); };
public bool IsLayoutSequential { get; }
member this.IsLayoutSequential : bool
Public ReadOnly Property IsLayoutSequential As Boolean


現在の型の true プロパティに Attributes が含まれる場合は SequentialLayout。それ以外の場合は falsetrue if the Attributes property of the current type includes SequentialLayout; otherwise, false.


次の例では、クラスのLayoutKind.Sequential列挙値StructLayoutAttributeIsLayoutSequential設定されているクラスのインスタンスを作成し、プロパティを確認して、結果を表示します。The following example creates an instance of a class for which the LayoutKind.Sequential enumeration value in the StructLayoutAttribute class has been set, checks for the IsLayoutSequential property, and displays the result.

#using <System.dll>

using namespace System;
using namespace System::Reflection;
using namespace System::ComponentModel;
using namespace System::Runtime::InteropServices;
ref class MyTypeSequential1{};

ref class MyTypeSequential2{};

int main()
      // Create an instance of myTypeSeq1.
      MyTypeSequential1^ myObj1 = gcnew MyTypeSequential1;
      // Check for and display the SequentialLayout attribute.
      Console::WriteLine( "\nThe object myObj1 has IsLayoutSequential: {0}.", myObj1->GetType()->IsLayoutSequential );
      // Create an instance of 'myTypeSeq2' class.
      MyTypeSequential2^ myObj2 = gcnew MyTypeSequential2;
      // Check for and display the SequentialLayout attribute.
      Console::WriteLine( "\nThe object myObj2 has IsLayoutSequential: {0}.", myObj2->GetType()->IsLayoutSequential );
   catch ( Exception^ e ) 
      Console::WriteLine( "\nAn exception occurred: {0}", e->Message );


using System;
using System.Reflection;
using System.ComponentModel;
using System.Runtime.InteropServices;
class MyTypeSequential1
class MyTypeSequential2
    public static void Main(string []args)
            // Create an instance of myTypeSeq1.
            MyTypeSequential1 myObj1 = new MyTypeSequential1();
            Type myTypeObj1 = myObj1.GetType();
            // Check for and display the SequentialLayout attribute.
            Console.WriteLine("\nThe object myObj1 has IsLayoutSequential: {0}.", myObj1.GetType().IsLayoutSequential);
            // Create an instance of 'myTypeSeq2' class.
            MyTypeSequential2 myObj2 = new MyTypeSequential2();
            Type myTypeObj2 = myObj2.GetType();
            // Check for and display the SequentialLayout attribute.
            Console.WriteLine("\nThe object myObj2 has IsLayoutSequential: {0}.", myObj2.GetType().IsLayoutSequential);
        catch(Exception e)
            Console.WriteLine("\nAn exception occurred: {0}", e.Message);
Imports System.Reflection
Imports System.ComponentModel
Imports System.Runtime.InteropServices

Class MyTypeSequential1
End Class
<StructLayoutAttribute(LayoutKind.Sequential)> Class MyTypeSequential2
    Public Shared Sub Main()
            ' Create an instance of MyTypeSequential1.
            Dim myObj1 As New MyTypeSequential1()
            Dim myTypeObj1 As Type = myObj1.GetType()
            ' Check for and display the SequentialLayout attribute.
            Console.WriteLine(ControlChars.Cr + "The object myObj1 has IsLayoutSequential: {0}.", myObj1.GetType().IsLayoutSequential.ToString())
            ' Create an instance of MyTypeSequential2.
            Dim myObj2 As New MyTypeSequential2()
            Dim myTypeObj2 As Type = myObj2.GetType()
            ' Check for and display the SequentialLayout attribute.
            Console.WriteLine(ControlChars.Cr + "The object myObj2 has IsLayoutSequential: {0}.", myObj2.GetType().IsLayoutSequential.ToString())
        Catch e As Exception
            Console.WriteLine(ControlChars.Cr + "An exception occurred: {0}", e.Message.ToString())
        End Try
    End Sub
End Class


このプロパティは便宜上提供されています。This property is provided as a convenience. または、 TypeAttributes.LayoutMask列挙値を使用して型レイアウト属性を選択し、が設定さTypeAttributes.SequentialLayoutれているかどうかをテストします。Alternatively, you can use the TypeAttributes.LayoutMask enumeration value to select the type layout attributes, and then test whether TypeAttributes.SequentialLayout is set. TypeAttributes.AutoLayoutTypeAttributes.ExplicitLayoutおよびTypeAttributes.SequentialLayoutの各列挙値は、型のフィールドをメモリにレイアウトする方法を示します。The TypeAttributes.AutoLayout, TypeAttributes.ExplicitLayout, and TypeAttributes.SequentialLayout enumeration values indicate the way the fields of the type are laid out in memory.

動的な型の場合は、 TypeAttributes.SequentialLayout型をいつ作成するかを指定できます。For dynamic types, you can specify TypeAttributes.SequentialLayout when you create the type. コードで、 LayoutKind.Sequential列挙値StructLayoutAttributeを含む属性を型に適用して、レイアウトがシーケンシャルであることを指定します。In code, apply the StructLayoutAttribute attribute with the LayoutKind.Sequential enumeration value to the type, to specify that layout is sequential.


GetCustomAttributesメソッドを使用して、 StructLayoutAttributeが型に適用されているかどうかを判断することはできません。You cannot use the GetCustomAttributes method to determine whether the StructLayoutAttribute has been applied to a type.

詳細については、共通言語基盤 (CLI) の仕様の9.1.2 のセクション「Partition II:メタデータの定義とセマンティクス "。For more information, see section 9.1.2 of the specification for the Common Language Infrastructure (CLI) documentation, "Partition II: Metadata Definition and Semantics". ドキュメントはオンラインで入手できます。MSDN の「ECMA C# and Common Language Infrastructure Standards」 (ECMA の C# および共通言語基盤の標準規格) と、ECMA のインターナショナル Web サイトにある「Standard ECMA-335 - Common Language Infrastructure (CLI)」を参照してください。The documentation is available online; see ECMA C# and Common Language Infrastructure Standards on MSDN and Standard ECMA-335 - Common Language Infrastructure (CLI) on the Ecma International Web site.

現在Typeのが構築ジェネリック型を表している場合、このプロパティは、型が構築された元のジェネリック型定義に適用されます。If the current Type represents a constructed generic type, this property applies to the generic type definition from which the type was constructed. たとえば、現在TypeのがMyGenericType(Of Integer) (Visual Basic MyGenericType<int> ) を表している場合、このプロパティの値はにMyGenericType<T>よって決定されます。For example, if the current Type represents MyGenericType<int> (MyGenericType(Of Integer) in Visual Basic), the value of this property is determined by MyGenericType<T>.

現在Typeのがジェネリック型またはジェネリックメソッドの定義の型パラメーターを表している場合、このプロパティfalseは常にを返します。If the current Type represents a type parameter in the definition of a generic type or generic method, this property always returns false.