InterfaceTypeAttribute 类

定义

指示向 COM 公开时,托管接口是双重的、仅支持调度的、还是仅支持 IUnknown 的。Indicates whether a managed interface is dual, dispatch-only, or IUnknown -only when exposed to COM.

public ref class InterfaceTypeAttribute sealed : Attribute
[System.AttributeUsage(System.AttributeTargets.Interface, Inherited=false)]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class InterfaceTypeAttribute : Attribute
type InterfaceTypeAttribute = class
    inherit Attribute
Public NotInheritable Class InterfaceTypeAttribute
Inherits Attribute
继承
InterfaceTypeAttribute
属性

示例

下面的示例演示如何InterfaceTypeAttribute控制如何向 COM 公开接口。The following example shows how InterfaceTypeAttribute controls how the interface is exposed to COM.

using namespace System::Runtime::InteropServices;

//Interface is exposed to COM as dual.
interface class IMyInterface1{};

//Insert code here.
//Interface is exposed to COM as IDispatch.

[InterfaceTypeAttribute(ComInterfaceType::InterfaceIsIDispatch)]
interface class IMyInterface2{};
//Insert code here.
using System.Runtime.InteropServices;

//Interface is exposed to COM as dual.
interface IMyInterface1 
{
    //Insert code here.
}

//Interface is exposed to COM as IDispatch.
[InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIDispatch)]
interface IMyInterface2 
{
    //Insert code here.
}
Imports System.Runtime.InteropServices

'Interface is exposed to COM as dual.
Interface IMyInterface1
     'Insert code here.
End Interface

'Interface is exposed to COM as IDispatch.
<InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIDispatch)> _
Interface IMyInterface2
    'Insert code here.
End Interface

注解

可以将此特性应用于接口。You can apply this attribute to interfaces.

默认情况下, tlbexp.exe (类型库导出程序)将托管接口作为双重接口公开给 COM, 使你可以灵活地进行后期绑定或早期绑定的性能。By default, the Tlbexp.exe (Type Library Exporter) exposes a managed interface to COM as a dual interface, giving you the flexibility of late binding or the performance of early binding. ComInterfaceType枚举使你可以重写默认行为, 并仅指定后期绑定或仅指定早期绑定。The ComInterfaceType enumeration enables you to override the default behavior and specify late binding only or early binding only. 例如, 你可以将应用InterfaceType (ComInterfaceType.InterfaceIsIDispatch)于接口以生成元数据, 以将调用方限制为仅限后期绑定。For example, you can apply InterfaceType (ComInterfaceType.InterfaceIsIDispatch) to an interface to produce metadata to restrict callers to late binding only. 尽管从IDispatch接口派生的接口通常是双重的InterfaceIsIDispatch , 但枚举成员只允许对接口方法进行后期绑定调用。Although interfaces that derive from the IDispatch interface are often dual, the InterfaceIsIDispatch enumeration member allows only late-bound calls to the interface methods. 此属性对接口的托管视图不起作用。This attribute has no effect on the managed view of the interface. 有关如何向 COM 公开接口的其他信息, 请参阅导出类型转换For additional information on how interfaces are exposed to COM, see Exported Type Conversion.

Tlbimp.exe (类型库导入程序)还将此特性应用于导入的 nondual 接口;它应用适当的枚举成员, 以指示接口仅用于调度或IUnknown仅调度。The Tlbimp.exe (Type Library Importer) also applies this attribute to imported, nondual interfaces; it applies the appropriate enumeration member to indicate that the interface is dispatch-only or IUnknown -only.

构造函数

InterfaceTypeAttribute(ComInterfaceType)

使用指定的 ComInterfaceType 枚举成员初始化 InterfaceTypeAttribute 类的新实例。Initializes a new instance of the InterfaceTypeAttribute class with the specified ComInterfaceType enumeration member.

InterfaceTypeAttribute(Int16)

使用指定的 ComInterfaceType 枚举成员初始化 InterfaceTypeAttribute 类的新实例。Initializes a new instance of the InterfaceTypeAttribute class with the specified ComInterfaceType enumeration member.

属性

TypeId

在派生类中实现时,获取此 Attribute 的唯一标识符。When implemented in a derived class, gets a unique identifier for this Attribute.

(继承自 Attribute)
Value

获取 ComInterfaceType 值,该值描述应如何向 COM 公开接口。Gets the ComInterfaceType value that describes how the interface should be exposed to COM.

方法

Equals(Object)

返回一个值,该值指示此实例是否与指定的对象相等。Returns a value that indicates whether this instance is equal to a specified object.

(继承自 Attribute)
GetHashCode()

返回此实例的哈希代码。Returns the hash code for this instance.

(继承自 Attribute)
GetType()

获取当前实例的 TypeGets the Type of the current instance.

(继承自 Object)
IsDefaultAttribute()

在派生类中重写时,指示此实例的值是否是派生类的默认值。When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.

(继承自 Attribute)
Match(Object)

当在派生类中重写时,返回一个指示此实例是否等于指定对象的值。When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.

(继承自 Attribute)
MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(继承自 Object)
ToString()

返回一个表示当前对象的 string。Returns a string that represents the current object.

(继承自 Object)

显式界面实现

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

将一组名称映射为对应的一组调度标识符。Maps a set of names to a corresponding set of dispatch identifiers.

(继承自 Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

检索对象的类型信息,然后可以使用该信息获取接口的类型信息。Retrieves the type information for an object, which can be used to get the type information for an interface.

(继承自 Attribute)
_Attribute.GetTypeInfoCount(UInt32)

检索对象提供的类型信息接口的数量(0 或 1)。Retrieves the number of type information interfaces that an object provides (either 0 or 1).

(继承自 Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

提供对某一对象公开的属性和方法的访问。Provides access to properties and methods exposed by an object.

(继承自 Attribute)

适用于

另请参阅