Type.FilterAttribute Pole

Definice

Představuje filtr členů použitý u atributů.Represents the member filter used on attributes. Toto pole je jen ke čtení.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 

Hodnota pole

MemberFilter

Příklady

Následující příklad získá FilterAttribute delegáta, předá ho jako parametr FindMembers metodě a zobrazí zadané členy a jejich atributy.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

Poznámky

Toto pole obsahuje odkaz na delegáta použitý FindMembers metodou.This field holds a reference to the delegate used by the FindMembers method. Metoda zapouzdřená tímto delegátem přijímá dva parametry: první je MemberInfo objekt a druhý je Object .The method encapsulated by this delegate takes two parameters: the first is a MemberInfo object and the second is an Object. Metoda určuje, zda MemberInfo objekt odpovídá kritériím určeným parametrem Object .The method determines whether the MemberInfo object matches the criteria specified by the Object. ObjectMůže být přiřazena hodnota některého z polí třídy FieldAttributes , MethodAttributes nebo MethodImplAttributes .The Object may be assigned the value of any one of the fields on the classes FieldAttributes, MethodAttributes, or MethodImplAttributes.

Například Object může být přiřazena hodnota pole z, FieldAttributes například Public.For example, the Object can be assigned the value of a field from FieldAttributes such as Public. V takovém případě bude při FilterAttribute vyvolání delegáta vrácena true pouze v případě, že metoda reprezentovaná MemberInfo objektem je upravena atributem veřejného pole v metadatech.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.

Platí pro

Viz také