Type.IsLayoutSequential Vlastnost

Definice

Získá hodnotu, která označuje, zda jsou pole aktuálního typu rozložena sekvenčně, v pořadí, v jakém byly definovány nebo generovány do metadat.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.

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

Hodnota vlastnosti

Boolean

true Pokud Attributes vlastnost aktuálního typu zahrnuje SequentialLayout ; v opačném případě false .true if the Attributes property of the current type includes SequentialLayout; otherwise, false.

Implementuje

Příklady

Následující příklad vytvoří instanci třídy, pro kterou LayoutKind.Sequential byla nastavena hodnota výčtu ve StructLayoutAttribute třídě, kontroluje IsLayoutSequential vlastnost a zobrazí výsledek.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{};


[StructLayoutAttribute(LayoutKind::Sequential)]
ref class MyTypeSequential2{};

int main()
{
   try
   {
      
      // 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
{
}
[StructLayoutAttribute(LayoutKind.Sequential)]
class MyTypeSequential2
{
    public static void Main(string []args)
    {
        try
        {
            // 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()
        Try
            ' 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

Poznámky

Tato vlastnost je poskytována jako pohodlí.This property is provided as a convenience. Alternativně můžete použít TypeAttributes.LayoutMask hodnotu výčtu k výběru atributů rozložení typu a pak otestovat, zda TypeAttributes.SequentialLayout je nastavena.Alternatively, you can use the TypeAttributes.LayoutMask enumeration value to select the type layout attributes, and then test whether TypeAttributes.SequentialLayout is set. TypeAttributes.AutoLayout TypeAttributes.ExplicitLayout Hodnoty výčtu, a TypeAttributes.SequentialLayout označují způsob, jakým jsou pole typu rozložena v paměti.The TypeAttributes.AutoLayout, TypeAttributes.ExplicitLayout, and TypeAttributes.SequentialLayout enumeration values indicate the way the fields of the type are laid out in memory.

Pro dynamické typy lze zadat TypeAttributes.SequentialLayout při vytváření typu.For dynamic types, you can specify TypeAttributes.SequentialLayout when you create the type. V kódu použijte StructLayoutAttribute atribut s LayoutKind.Sequential hodnotou výčtu na typ, chcete-li určit, že rozložení je sekvenční.In code, apply the StructLayoutAttribute attribute with the LayoutKind.Sequential enumeration value to the type, to specify that layout is sequential.

Poznámka

Metodu nelze použít GetCustomAttributes k určení, zda byla StructLayoutAttribute použita pro typ.You cannot use the GetCustomAttributes method to determine whether the StructLayoutAttribute has been applied to a type.

Další informace najdete v části 9.1.2 specifikace pro dokumentaci k Common Language Infrastructure (CLI), "partition II: definice metadat a sémantiku".For more information, see section 9.1.2 of the specification for the Common Language Infrastructure (CLI) documentation, "Partition II: Metadata Definition and Semantics". Dokumentace je k dispozici online; Viz článek ECMA C# a Common Language Infrastructure standardů na webu MSDN a standardní ECMA-335-Common Language Infrastructure (CLI) na webu ECMA International.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.

Pokud aktuální Type představuje Konstruovaný obecný typ, tato vlastnost se vztahuje na definici obecného typu, ze které byl typ vytvořen.If the current Type represents a constructed generic type, this property applies to the generic type definition from which the type was constructed. Například pokud aktuální Type představuje MyGenericType<int> ( MyGenericType(Of Integer) v Visual Basic), hodnota této vlastnosti je určena hodnotou MyGenericType<T> .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>.

Pokud aktuální Type představuje parametr typu v definici obecného typu nebo obecné metody, tato vlastnost vždy vrátí false .If the current Type represents a type parameter in the definition of a generic type or generic method, this property always returns false.

Platí pro

Viz také