Type.FindMembers(MemberTypes, BindingFlags, MemberFilter, Object) Método

public:
 virtual cli::array <System::Reflection::MemberInfo ^> ^ FindMembers(System::Reflection::MemberTypes memberType, System::Reflection::BindingFlags bindingAttr, System::Reflection::MemberFilter ^ filter, System::Object ^ filterCriteria);

[System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembers(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.NonPublicConstructors | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.NonPublicEvents | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.NonPublicFields | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.NonPublicMethods | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.NonPublicNestedTypes | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.NonPublicProperties | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicConstructors | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicEvents | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicFields | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicMethods | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicNestedTypes | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicProperties)]
public virtual System.Reflection.MemberInfo[] FindMembers(System.Reflection.MemberTypes memberType, System.Reflection.BindingFlags bindingAttr, System.Reflection.MemberFilter? filter, object? filterCriteria);

[System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembers(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.All)]
public virtual System.Reflection.MemberInfo[] FindMembers(System.Reflection.MemberTypes memberType, System.Reflection.BindingFlags bindingAttr, System.Reflection.MemberFilter? filter, object? filterCriteria);

public virtual System.Reflection.MemberInfo[] FindMembers(System.Reflection.MemberTypes memberType, System.Reflection.BindingFlags bindingAttr, System.Reflection.MemberFilter filter, object filterCriteria);

public virtual System.Reflection.MemberInfo[] FindMembers(System.Reflection.MemberTypes memberType, System.Reflection.BindingFlags bindingAttr, System.Reflection.MemberFilter? filter, object? filterCriteria);

[<System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembers(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.NonPublicConstructors | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.NonPublicEvents | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.NonPublicFields | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.NonPublicMethods | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.NonPublicNestedTypes | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.NonPublicProperties | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicConstructors | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicEvents | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicFields | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicMethods | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicNestedTypes | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicProperties)>]
abstract member FindMembers : System.Reflection.MemberTypes * System.Reflection.BindingFlags * System.Reflection.MemberFilter * obj -> System.Reflection.MemberInfo[]
override this.FindMembers : System.Reflection.MemberTypes * System.Reflection.BindingFlags * System.Reflection.MemberFilter * obj -> System.Reflection.MemberInfo[]

[<System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembers(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.All)>]
abstract member FindMembers : System.Reflection.MemberTypes * System.Reflection.BindingFlags * System.Reflection.MemberFilter * obj -> System.Reflection.MemberInfo[]
override this.FindMembers : System.Reflection.MemberTypes * System.Reflection.BindingFlags * System.Reflection.MemberFilter * obj -> System.Reflection.MemberInfo[]

abstract member FindMembers : System.Reflection.MemberTypes * System.Reflection.BindingFlags * System.Reflection.MemberFilter * obj -> System.Reflection.MemberInfo[]
override this.FindMembers : System.Reflection.MemberTypes * System.Reflection.BindingFlags * System.Reflection.MemberFilter * obj -> System.Reflection.MemberInfo[]

Public Overridable Function FindMembers (memberType As MemberTypes, bindingAttr As BindingFlags, filter As MemberFilter, filterCriteria As Object) As MemberInfo()

Parâmetros

Devoluções

Um array filtrado de MemberInfo objetos do tipo de membro especificado.

-ou-

Um array vazio se a corrente Type não tiver membros do tipo memberType que correspondam aos critérios do filtro.

Implementações

Atributos

DynamicallyAccessedMembersAttribute

Exceções

Exemplos

O exemplo seguinte encontra todos os membros de uma classe que correspondem aos critérios de pesquisa especificados e depois mostra os membros correspondidos.

using System;
using System.Reflection;

class MyFindMembersClass
{
    public static void Main()
    {
        Object objTest = new Object();
        Type objType = objTest.GetType ();
        MemberInfo[] arrayMemberInfo;
        try
        {
            //Find all static or public methods in the Object class that match the specified name.
            arrayMemberInfo = objType.FindMembers(MemberTypes.Method,
                BindingFlags.Public | BindingFlags.Static| BindingFlags.Instance,
                new MemberFilter(DelegateToSearchCriteria),
                "ReferenceEquals");

            for(int index=0;index < arrayMemberInfo.Length ;index++)
                Console.WriteLine ("Result of FindMembers -\t"+ arrayMemberInfo[index].ToString() +"\n");
        }
        catch (Exception e)
        {
            Console.WriteLine ("Exception : " + e.ToString() );
        }
    }
    public static bool DelegateToSearchCriteria(MemberInfo objMemberInfo, Object objSearch)
    {
        // Compare the name of the member function with the filter criteria.
        if(objMemberInfo.Name.ToString() == objSearch.ToString())
            return true;
        else
            return false;
    }
}
/* The example produces the following output:

Result of FindMembers - Boolean ReferenceEquals(System.Object, System.Object)
*/

open System.Reflection

let delegateToSearchCriteria (objMemberInfo: MemberInfo) (objSearch: obj) =
    // Compare the name of the member function with the filter criteria.
    string objMemberInfo.Name = string objSearch

let objTest = obj ()
let objType = objTest.GetType ()
try
    //Find all static or public methods in the Object class that match the specified name.
    let arrayMemberInfo = 
        objType.FindMembers(MemberTypes.Method, BindingFlags.Public ||| BindingFlags.Static ||| BindingFlags.Instance, MemberFilter delegateToSearchCriteria, "ReferenceEquals")

    for info in arrayMemberInfo do
        printfn $"Result of FindMembers -\t{info}\n"
with e ->
    printfn $"Exception : {e}"

(* The example produces the following output:

Result of FindMembers - Boolean ReferenceEquals(System.Object, System.Object)
*)

Imports System.Reflection

Class MyFindMembersClass

    Public Shared Sub Main()
        Dim objTest As New Object()
        Dim objType As Type = objTest.GetType()
        Dim arrayMemberInfo() As MemberInfo
        Try
            'Find all static or public methods in the Object 
            'class that match the specified name.
            arrayMemberInfo = objType.FindMembers(MemberTypes.Method, _
                              BindingFlags.Public Or BindingFlags.Static _
                              Or BindingFlags.Instance, _
                              New MemberFilter(AddressOf DelegateToSearchCriteria), _
                              "ReferenceEquals")

            Dim index As Integer
            For index = 0 To arrayMemberInfo.Length - 1
                Console.WriteLine("Result of FindMembers -" + ControlChars.Tab + _
                               arrayMemberInfo(index).ToString() + ControlChars.Cr)
            Next index
        Catch e As Exception
            Console.WriteLine("Exception : " + e.ToString())
        End Try
    End Sub

    Public Shared Function DelegateToSearchCriteria _
                            (ByVal objMemberInfo As MemberInfo, _
                             ByVal objSearch As Object) As Boolean
        ' Compare the name of the member function with the filter criteria.
        If objMemberInfo.Name.ToString() = objSearch.ToString() Then
            Return True
        Else
            Return False
        End If
    End Function 'DelegateToSearchCriteria 
End Class
' The example produces the following output:
'
' Result of FindMembers - Boolean ReferenceEquals(System.Object, System.Object)

Observações

Este método pode ser anulado por uma classe derivada.

Os membros incluem propriedades, métodos, campos, eventos, e assim por diante.

Para que o FindMembers método recupere com sucesso informação dos membros, o argumento bindingAttr deve incluir pelo menos um de BindingFlags.Instance e BindingFlags.Static, juntamente com pelo menos um de BindingFlags.NonPublic e BindingFlags.Public.

As seguintes BindingFlags bandeiras de filtro podem ser usadas para definir quais os membros a incluir na pesquisa:

• Especifique BindingFlags.Instance incluir membros da instância na pesquisa.

• Especifique BindingFlags.Static incluir membros estáticos na pesquisa.

• Especifique BindingFlags.Public incluir membros públicos na pesquisa.

• Especifique BindingFlags.NonPublic incluir membros não públicos (ou seja, privados, internos e protegidos) na busca.

Os seguintes BindingFlags sinalizadores modificadores podem ser usados para alterar o funcionamento da pesquisa:

• BindingFlags.DeclaredOnly para procurar apenas os membros declarados no Type, não os membros que foram simplesmente herdados.

Consulte System.Reflection.BindingFlags para obter mais informações.

Para obter o inicializador de classes (construtor estático) usando este método, deve especificar BindingFlags.Static | BindingFlags.NonPublic (BindingFlags.StaticOrBindingFlags.NonPublic em Visual Basic). Também pode obter o inicializador de classes usando a TypeInitializer propriedade.

Se a corrente Type representa um parâmetro de tipo genérico ou método genérico, FindMembers processa quaisquer membros declarados pela restrição de classe e pelas restrições de interface do parâmetro de tipo.

O filter argumento pode ser um delegado personalizado do tipo MemberFilter, ou pode ser um dos seguintes delegados predefinidos:

• Type.FilterAttribute, que usa umaFieldAttributes, MethodAttributes, ou MethodImplAttributes bitmask como filterCriteria valor.

• Type.FilterName, que realiza uma comparação sensível a maiúsculas minúsculas de cada nome de membro com a cadeia passada para filterCriteria.

• Type.FilterNameIgnoreCase, que realiza uma comparação insensível a maiúsculas e minúsculas de cada nome de membro com a cadeia passada para filterCriteria.

Ver também

• MemberInfo
• BindingFlags
• DefaultBinder
• GetMember(String)
• GetMembers()
• GetDefaultMembers()