Type.IsAutoLayout 属性

定义

获取指示当前类型的字段是否由公共语言运行时自动放置的值。Gets a value indicating whether the fields of the current type are laid out automatically by the common language runtime.

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

属性值

如果当前类型的 true 属性包括 Attributes,则为 AutoLayout;否则为 falsetrue if the Attributes property of the current type includes AutoLayout; otherwise, false.

实现

示例

下面的示例创建类型的实例并显示 IsAutoLayout 属性。The following example creates an instance of the type and displays the IsAutoLayout property.

#using <System.dll>

using namespace System;
using namespace System::Reflection;
using namespace System::ComponentModel;
using namespace System::Runtime::InteropServices;

// The MyDemoAttribute class is selected as AutoLayout.

[StructLayoutAttribute(LayoutKind::Auto)]
public ref class MyDemoAttribute{};

void MyAutoLayoutMethod( String^ typeName )
{
   try
   {
      
      // Create an instance of the Type class using the GetType method.
      Type^ myType = Type::GetType( typeName );
      
      // Get and display the IsAutoLayout property of the
      // MyDemoAttribute instance.
      Console::WriteLine( "\nThe AutoLayout property for the MyDemoAttribute is {0}.", myType->IsAutoLayout );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "\nAn exception occurred: {0}.", e->Message );
   }

}

int main()
{
   MyAutoLayoutMethod( "MyDemoAttribute" );
}

using System;
using System.Runtime.InteropServices;

// The Demo class is attributed as AutoLayout.
[StructLayoutAttribute(LayoutKind.Auto)]
public class Demo
{
}

public class Example
{
    public static void Main()
    {
        // Create an instance of the Type class using the GetType method.
        Type  myType=typeof(Demo);
        // Get and display the IsAutoLayout property of the 
        // Demoinstance.
        Console.WriteLine("\nThe AutoLayout property for the Demo class is {0}.",
            myType.IsAutoLayout); 
    }
}
Imports System.Runtime.InteropServices

' The Demo class is has the AutoLayout attribute.
<StructLayoutAttribute(LayoutKind.Auto)> _
Public Class Demo
End Class 

Public Class Example
    Public Shared Sub Main()
        ' Get the Type object for the Demo class.
        Dim myType As Type = GetType(Demo)
        ' Get and display the IsAutoLayout property of the 
        ' Demo class.
        Console.WriteLine("The AutoLayout property for the Demo class is '{0}'.", _
            myType.IsAutoLayout.ToString())
    End Sub 
End Class 

注解

提供此属性是为了方便。This property is provided as a convenience. 或者,您可以使用 TypeAttributes.LayoutMask 的枚举值选择类型布局特性,然后测试是否设置了 TypeAttributes.AutoLayoutAlternatively, you can use the TypeAttributes.LayoutMask enumeration value to select the type layout attributes, and then test whether TypeAttributes.AutoLayout is set. TypeAttributes.AutoLayoutTypeAttributes.ExplicitLayoutTypeAttributes.SequentialLayout 枚举值指示类型的字段在内存中的布局方式。The TypeAttributes.AutoLayout,TypeAttributes.ExplicitLayout, and TypeAttributes.SequentialLayout enumeration values indicate the way the fields of the type are laid out in memory.

对于动态类型,可以在创建类型时指定 TypeAttributes.AutoLayoutFor dynamic types, you can specify TypeAttributes.AutoLayout when you create the type. 在代码中,将具有 LayoutKind.Auto 枚举值的 StructLayoutAttribute 特性应用到类型,以使运行时确定对类进行布局的适当方式。In code, apply the StructLayoutAttribute attribute with the LayoutKind.Auto enumeration value to the type, to let the runtime determine the appropriate way to lay out the class.

备注

不能使用 GetCustomAttributes 方法来确定 StructLayoutAttribute 是否已应用于类型。You cannot use the GetCustomAttributes method to determine whether the StructLayoutAttribute has been applied to a type.

如果当前 Type 表示构造泛型类型,则此属性应用于构造该类型的泛型类型定义。If the current Type represents a constructed generic type, this property applies to the generic type definition from which the type was constructed. 例如,如果当前 Type 表示 MyGenericType<int>MyGenericType(Of Integer) Visual Basic),则此属性的值由 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>.

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 falseIf the current Type represents a type parameter in the definition of a generic type or generic method, this property always returns false.

适用于

另请参阅