Type.IsLayoutSequential 属性
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
获取指示当前类型的字段是否按顺序（定义顺序或发送到元数据的顺序）放置的值。
public:
property bool IsLayoutSequential { bool get(); };public bool IsLayoutSequential { get; }member this.IsLayoutSequential : boolPublic ReadOnly Property IsLayoutSequential As Boolean属性值
如果当前类型的 true 属性包括 Attributes，则为 SequentialLayout；否则为 false。
实现
示例
以下示例创建类的实例，该类中已设置 类中的枚举值，检查 属性并显示 LayoutKind.Sequential StructLayoutAttribute IsLayoutSequential 结果。
#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
注解
为方便起见，提供了此属性。 或者，可以使用 TypeAttributes.LayoutMask 枚举值选择类型布局属性，然后测试是否 TypeAttributes.SequentialLayout 设置了 。 、 TypeAttributes.AutoLayout TypeAttributes.ExplicitLayout 和 TypeAttributes.SequentialLayout 枚举值指示类型字段在内存中的布局方式。
对于动态类型，可以在 TypeAttributes.SequentialLayout 创建类型时指定 。 在代码中，将具有 枚举值的属性应用于 类型， StructLayoutAttribute LayoutKind.Sequential 以指定布局是按顺序的。
备注
不能使用 方法 GetCustomAttributes 来确定 是否已 StructLayoutAttribute 应用于类型。
有关详细信息，请参阅公共语言基础结构 (CLI) 文档规范的第 9.1.2 节："分区 II：元数据定义和语义"。 可联机获取该文档；请参阅 MSDN 上的 ECMA C# 和公共语言基础结构标准和 Ecma International 网站上的标准 ECMA-335 - 公共语言基础结构 (CLI)。
如果当前 表示构造的泛型类型，则此属性将应用于构造该类型的 Type 泛型类型定义。 例如，如果当前 表示 (Type MyGenericType<int> MyGenericType(Of Integer) 中Visual Basic) ，则此属性的值由 确定 MyGenericType<T> 。
如果当前 Type 表示泛型类型或泛型方法的定义中的类型参数，则此属性始终返回 false 。