Skip to main content
.NET Framework Class Library
Type..::.FilterAttribute Field

Represents the member filter used on attributes. This field is read-only.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
Public Shared ReadOnly FilterAttribute As MemberFilter
public static readonly MemberFilter FilterAttribute
public:
static initonly MemberFilter^ FilterAttribute
static val FilterAttribute: MemberFilter
Remarks

This field holds a reference to the delegate used by the FindMembers method. The method encapsulated by this delegate takes two parameters: the first is a MemberInfo object and the second is an Object. The method determines whether the MemberInfo object matches the criteria specified by the Object. The Object may be assigned the value of any one of the fields on the classes FieldAttributes, MethodAttributes, or MethodImplAttributes.

For example, the Object can be assigned the value of a field from FieldAttributes such as Public. 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.

Examples

The following example gets the FilterAttribute delegate, passes it as a parameter to the FindMembers method, and displays the specified members and their attributes.


Imports System
Imports System.Reflection
Imports System.Security
Imports Microsoft.VisualBasic

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 'Main
End Class 'MyFilterAttributeSample


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); 
        } 
    }	
}


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 );
   }

}

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Microsoft is conducting an online survey to understand your opinion of the MSDN Web site. If you choose to participate, the online survey will be presented to you when you leave the MSDN Web site.

Would you like to participate?