Type.FilterAttribute Поле

Определение

Предоставляет фильтр членов, используемый для атрибутов.Represents the member filter used on attributes. Это поле доступно только для чтения.This field is read-only.

public: static initonly System::Reflection::MemberFilter ^ FilterAttribute;
public static readonly System.Reflection.MemberFilter FilterAttribute;
 staticval mutable FilterAttribute : System.Reflection.MemberFilter
Public Shared ReadOnly FilterAttribute As MemberFilter 

Значение поля

Примеры

В следующем примере возвращается делегат FilterAttribute, передается в качестве параметра методу FindMembers и отображаются указанные элементы и их атрибуты.The following example gets the FilterAttribute delegate, passes it as a parameter to the FindMembers method, and displays the specified members and their attributes.

using namespace System;
using namespace System::Collections;
using namespace System::Reflection;
using namespace System::Security;
int main()
{
   try
   {
      MemberFilter^ myFilter = Type::FilterAttribute;
      Type^ myType = System::String::typeid;
      array<MemberInfo^>^myMemberInfoArray = myType->FindMembers( static_cast<MemberTypes>(MemberTypes::Constructor | MemberTypes::Method), static_cast<BindingFlags>(BindingFlags::Public | BindingFlags::Static | BindingFlags::Instance), myFilter, MethodAttributes::SpecialName );
      IEnumerator^ myEnum = myMemberInfoArray->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         MemberInfo^ myMemberinfo = safe_cast<MemberInfo^>(myEnum->Current);
         Console::Write( "\n {0}", myMemberinfo->Name );
         Console::Write( " is a {0}", myMemberinfo->MemberType );
      }
   }
   catch ( ArgumentNullException^ e ) 
   {
      Console::Write( "ArgumentNullException : {0}", e->Message );
   }
   catch ( SecurityException^ e ) 
   {
      Console::Write( "SecurityException : {0}", e->Message );
   }
   catch ( Exception^ e ) 
   {
      Console::Write( "Exception : {0}", e->Message );
   }

}
using System;
using System.Reflection;
using System.Security;

public class MyFilterAttributeSample
{
    public static void Main()
    {
        try
        {
            MemberFilter myFilter = Type.FilterAttribute;
            Type myType = typeof(System.String);
            MemberInfo[] myMemberInfoArray = myType.FindMembers(MemberTypes.Constructor
                |MemberTypes.Method, BindingFlags.Public | BindingFlags.Static |
                BindingFlags.Instance, myFilter, MethodAttributes.SpecialName);
            foreach (MemberInfo myMemberinfo in myMemberInfoArray) 
            { 
                Console.Write ("\n" + myMemberinfo.Name);
                Console.Write (" is a " + myMemberinfo.MemberType.ToString()); 
            }
        }
        catch(ArgumentNullException e)
        {
            Console.Write("ArgumentNullException : " + e.Message); 
        }   
        catch(SecurityException e)
        {
            Console.Write("SecurityException : " + e.Message); 
        }   
        catch(Exception e)
        {
            Console.Write("Exception :" + e.Message); 
        } 
    }	
}
Imports System.Reflection
Imports System.Security

Public Class MyFilterAttributeSample

    Public Shared Sub Main()
        Try
            Dim myFilter As MemberFilter = Type.FilterAttribute
            Dim myType As Type = GetType(System.String)
            Dim myMemberInfoArray As MemberInfo() = myType.FindMembers(MemberTypes.Constructor Or MemberTypes.Method, BindingFlags.Public Or BindingFlags.Static Or BindingFlags.Instance, myFilter, MethodAttributes.SpecialName)
            Dim myMemberinfo As MemberInfo
            For Each myMemberinfo In myMemberInfoArray
                Console.Write(ControlChars.newline + myMemberinfo.Name)
                Console.Write(" is a " + myMemberinfo.MemberType.ToString())
            Next myMemberinfo

        Catch e As ArgumentNullException
            Console.Write("ArgumentNullException : " + e.Message.ToString())
        Catch e As SecurityException
            Console.Write("SecurityException : " + e.Message.ToString())
        Catch e As Exception
            Console.Write("Exception :" + e.Message.ToString())
        End Try
    End Sub
End Class

Комментарии

Это поле содержит ссылку на делегат, используемый методом FindMembers.This field holds a reference to the delegate used by the FindMembers method. Метод, инкапсулированный этим делегатом, принимает два параметра: Первый — это объект MemberInfo, а второй — Object.The method encapsulated by this delegate takes two parameters: the first is a MemberInfo object and the second is an Object. Метод определяет, соответствует ли объект MemberInfo критериям, заданным Object.The method determines whether the MemberInfo object matches the criteria specified by the Object. Object может быть назначено значение любого из полей в классах FieldAttributes, MethodAttributesили MethodImplAttributes.The Object may be assigned the value of any one of the fields on the classes FieldAttributes, MethodAttributes, or MethodImplAttributes.

Например, Object можно присвоить значение поля из FieldAttributes например public.For example, the Object can be assigned the value of a field from FieldAttributes such as Public. В этом случае, когда вызывается делегат FilterAttribute, он возвращает true только в том случае, если метод, представленный объектом MemberInfo, снабжен открытым атрибутом Field в метаданных.In that case, when the FilterAttribute delegate is invoked, it will return true only if the method represented by the MemberInfo object is decorated with the public field attribute in metadata.

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