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

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()

Parametrar

Returer

En filtrerad matris med MemberInfo objekt av den angivna medlemstypen.

-eller-

En tom matris om den aktuella Type inte har medlemmar av typen memberType som matchar filtervillkoren.

Implementeringar

Attribut

DynamicallyAccessedMembersAttribute

Undantag

Exempel

I följande exempel hittar du alla medlemmar i en klass som matchar de angivna sökvillkoren och visar sedan de matchade medlemmarna.

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)

Kommentarer

Den här metoden kan åsidosättas av en härledd klass.

Medlemmar inkluderar egenskaper, metoder, fält, händelser och så vidare.

FindMembers För att metoden ska kunna hämta medlemsinformation bindingAttr måste argumentet innehålla minst en av BindingFlags.Instance och BindingFlags.Static, tillsammans med minst en av BindingFlags.NonPublic och BindingFlags.Public.

Följande BindingFlags filterflaggor kan användas för att definiera vilka medlemmar som ska inkluderas i sökningen:

• Ange BindingFlags.Instance att instansmedlemmar ska inkluderas i sökningen.

• Ange BindingFlags.Static att statiska medlemmar ska inkluderas i sökningen.

• Ange BindingFlags.Public att offentliga medlemmar ska inkluderas i sökningen.

• Ange BindingFlags.NonPublic att icke-offentliga medlemmar (dvs. privata, interna och skyddade medlemmar) ska inkluderas i sökningen.

Följande BindingFlags modifierarflaggor kan användas för att ändra hur sökningen fungerar:

• BindingFlags.DeclaredOnly om du bara vill söka efter de medlemmar som deklarerats på Type, inte medlemmar som helt enkelt ärvts.

Mer information finns i System.Reflection.BindingFlags.

Om du vill hämta klassinitieraren (statisk konstruktor) med den här metoden måste du ange BindingFlags.Static | BindingFlags.NonPublic (BindingFlags.StaticOrBindingFlags.NonPublic i Visual Basic). Du kan också hämta klassinitieraren med hjälp av TypeInitializer egenskapen .

Om den aktuella Type representerar en typparameter av en allmän typ eller allmän metod, FindMembers bearbetar alla medlemmar som deklareras av klassbegränsningen och gränssnittsbegränsningarna för typparametern.

Argumentet filter kan vara ett anpassat ombud av typen MemberFilter, eller så kan det vara någon av följande fördefinierade ombud:

• Type.FilterAttribute, som använder enFieldAttributes, MethodAttributeseller MethodImplAttributes bitmask som filterCriteria värde.

• Type.FilterName, som utför en skiftlägeskänslig jämförelse av varje medlemsnamn med strängen som skickas till filterCriteria.

• Type.FilterNameIgnoreCase, som utför en skiftlägeskänslig jämförelse av varje medlemsnamn med strängen som skickas till filterCriteria.

Se även

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