ImportedFromTypeLibAttribute 类

定义

指示在程序集内定义的类型原来在类型库中定义。Indicates that the types defined within an assembly were originally defined in a type library.

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

示例

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

class ClassA
{
private:
   static bool IsCOMAssembly( Assembly^ a )
   {
      array<Object^>^AsmAttributes = a->GetCustomAttributes( ImportedFromTypeLibAttribute::typeid, true );
      if ( AsmAttributes->Length > 0 )
      {
         ImportedFromTypeLibAttribute^ imptlb = dynamic_cast<ImportedFromTypeLibAttribute^>(AsmAttributes[ 0 ]);
         String^ strImportedFrom = imptlb->Value;
         
         // Print out the name of the DLL from which the assembly is imported.
         Console::WriteLine( "Assembly {0} is imported from {1}", a->FullName, strImportedFrom );
         return true;
      }

      // This is not a COM assembly.
      Console::WriteLine( "Assembly {0} is not imported from COM", a->FullName );
      return false;
   }
};
using System;
using System.Reflection;
using System.Runtime.InteropServices;

namespace A
{
    class ClassA
    {
        public static bool IsCOMAssembly( Assembly a )
        {
            object[] AsmAttributes = a.GetCustomAttributes( typeof( ImportedFromTypeLibAttribute ), true );
            if( AsmAttributes.Length > 0 )
            {
                ImportedFromTypeLibAttribute imptlb = ( ImportedFromTypeLibAttribute )AsmAttributes[0];
                string strImportedFrom  = imptlb.Value;
                    
                // Print out the name of the DLL from which the assembly is imported.
                Console.WriteLine( "Assembly " + a.FullName + " is imported from " + strImportedFrom );
            
                return true;
            }  
            // This is not a COM assembly.
            Console.WriteLine( "Assembly " + a.FullName + " is not imported from COM" );
            return false;
        }
    }
}
Imports System.Reflection
Imports System.Runtime.InteropServices

Module A
    Public Function IsCOMAssembly(ByVal a As System.Reflection.Assembly) As Boolean

        Dim AsmAttributes As Object() = a.GetCustomAttributes(GetType(ImportedFromTypeLibAttribute), True)
        If AsmAttributes.Length = 1 Then
            Dim imptlb As ImportedFromTypeLibAttribute = AsmAttributes(0)
            Dim strImportedFrom As String = imptlb.Value

            ' Print out the name of the DLL from which the assembly is imported.
            Console.WriteLine("Assembly " + a.FullName + " is imported from " + strImportedFrom)

            Return True
        End If

        ' This is not a COM assembly.
        Console.WriteLine("Assembly " + a.FullName + " is not imported from COM")

        Return False
    End Function
End Module

注解

可以将此特性应用于程序集,尽管tlbimp.exe (类型库导入程序)通常会在类型库中应用此特性。You can apply this attribute to assemblies, although the Tlbimp.exe (Type Library Importer) typically applies it for you when it a type library.

特性的主要用途是捕获类型信息的原始源。The primary use of the attribute is to capture the original source of the type information. 例如,可以导入 .tlb 作为互操作程序集(称为 .dll),并使程序集 b. 引用 .dll。For example, you can import A.tlb as an interop assembly called A.dll and have assembly B.dll reference A.dll. 将 b. 导出到 "b." 时,此属性会导致指向 .dll 的引用中的引用改为指向 .tlb。When you export B.dll to B.tlb, this attribute causes the references in B.tlb that point to A.dll to point instead to A.tlb. 这不应与 ComImportAttribute混淆,后者指定单个类型在 COM 中实现。This should not be confused with the ComImportAttribute, which specifies that an individual type is implemented in COM.

构造函数

ImportedFromTypeLibAttribute(String)

用原始类型库文件的名称初始化 ImportedFromTypeLibAttribute 类的新实例。Initializes a new instance of the ImportedFromTypeLibAttribute class with the name of the original type library file.

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

获取原始类型库文件的名称。Gets the name of the original type library file.

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)

显式接口实现

_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