Type.FilterAttribute Campo

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 

Valore del campo

MemberFilter

Esempio

Nell'esempio seguente viene ottenuto il FilterAttribute delegato, passato come parametro al FindMembers metodo e vengono visualizzati i membri specificati e i relativi attributi.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

Commenti

Questo campo include un riferimento al delegato utilizzato dal FindMembers metodo.This field holds a reference to the delegate used by the FindMembers method. Il metodo incapsulato da questo delegato accetta due parametri: il primo è un MemberInfo oggetto e il secondo è Object .The method encapsulated by this delegate takes two parameters: the first is a MemberInfo object and the second is an Object. Il metodo determina se l' MemberInfo oggetto corrisponde ai criteri specificati da Object .The method determines whether the MemberInfo object matches the criteria specified by the Object. ObjectA può essere assegnato il valore di uno dei campi delle classi FieldAttributes , MethodAttributes o MethodImplAttributes .The Object may be assigned the value of any one of the fields on the classes FieldAttributes, MethodAttributes, or MethodImplAttributes.

È ad esempio Object possibile assegnare il valore di un campo, ad esempio FieldAttributes public.For example, the Object can be assigned the value of a field from FieldAttributes such as Public. In tal caso, quando il FilterAttribute delegato viene richiamato, viene restituito true solo se il metodo rappresentato dall' MemberInfo oggetto è decorato con l'attributo di campo public nei metadati.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.

Si applica a

Vedi anche

• FindMembers(MemberTypes, BindingFlags, MemberFilter, Object)
• MemberFilter