Type.FilterAttribute 字段

定义

表示用在特性上的成员筛选器。 此字段为只读。

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 

字段值

MemberFilter

示例

下面的示例获取 FilterAttribute 委托,将其作为参数传递给 FindMembers 方法,并显示指定的成员及其属性。

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

注解

此字段包含对方法使用的委托的引用 FindMembers 。 此委托封装的方法采用两个参数:第一个是 MemberInfo 对象,第二个参数是 Object 。 方法确定 MemberInfo 对象是否与指定的条件匹配 ObjectObject可以为类、或上的任何一个字段分配值 FieldAttributes MethodAttributes MethodImplAttributes

例如,可以为 Object 指定字段的值, FieldAttributes 例如 Public。 在这种情况下,当 FilterAttribute 调用委托时,仅当 true 对象表示的方法 MemberInfo 使用元数据中的公共字段特性修饰时,它才会返回。

适用于

另请参阅