Module.ResolveMethod Método

  • Referência

Definição

Namespace:
System.Reflection
Assembly:
System.Runtime.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll

Retorna o método identificado por um token de metadados.

Sobrecargas

ResolveMethod(Int32, Type[], Type[])

Retorna o método ou o construtor identificado pelo token de metadados especificado, no contexto definido pelos parâmetros de tipo genérico especificados.
ResolveMethod(Int32)

Retorna o método ou o construtor identificado pelo token de metadados especificado.

ResolveMethod(Int32, Type[], Type[])

Origem:
Module.cs
Origem:
Module.cs
Origem:
Module.cs

Retorna o método ou o construtor identificado pelo token de metadados especificado, no contexto definido pelos parâmetros de tipo genérico especificados.

public:
 virtual System::Reflection::MethodBase ^ ResolveMethod(int metadataToken, cli::array <Type ^> ^ genericTypeArguments, cli::array <Type ^> ^ genericMethodArguments);
public:
 System::Reflection::MethodBase ^ ResolveMethod(int metadataToken, cli::array <Type ^> ^ genericTypeArguments, cli::array <Type ^> ^ genericMethodArguments);
public virtual System.Reflection.MethodBase? ResolveMethod (int metadataToken, Type[]? genericTypeArguments, Type[]? genericMethodArguments);
public virtual System.Reflection.MethodBase ResolveMethod (int metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments);
public System.Reflection.MethodBase ResolveMethod (int metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments);
abstract member ResolveMethod : int * Type[] * Type[] -> System.Reflection.MethodBase
override this.ResolveMethod : int * Type[] * Type[] -> System.Reflection.MethodBase
member this.ResolveMethod : int * Type[] * Type[] -> System.Reflection.MethodBase
Public Overridable Function ResolveMethod (metadataToken As Integer, genericTypeArguments As Type(), genericMethodArguments As Type()) As MethodBase
Public Function ResolveMethod (metadataToken As Integer, genericTypeArguments As Type(), genericMethodArguments As Type()) As MethodBase

Parâmetros

metadataToken
Int32

Um token de metadados que identifica um método ou um construtor no módulo.

genericTypeArguments
Type[]

Uma matriz de objetos Type que representam os argumentos de tipo genérico do tipo em que o token está no escopo ou null se esse tipo não for genérico.

genericMethodArguments
Type[]

Uma matriz de objetos Type que representam os argumentos de tipo genérico do método em que o token está no escopo ou null se esse método não for genérico.

Retornos

MethodBase

Um objeto MethodBase que representa o método que é identificado pelo token de metadados especificado.

Exceções

ArgumentException

metadataToken não é um token de um método ou construtor no escopo do módulo atual.

- ou -

metadataToken é um MethodSpec cuja assinatura contém o tipo de elemento var (um parâmetro de tipo de um tipo genérico) ou mvar (um parâmetro de tipo de um método genérico) e os argumentos de tipo genérico necessários não foram fornecidos para genericTypeArguments ou genericMethodArguments, ou para ambos.

ArgumentOutOfRangeException

metadataToken não é um token válido no escopo do módulo atual.

Exemplos

O exemplo a seguir mostra como usar as duas sobrecargas do ResolveMethod método para resolve tokens de metadados de sites de chamada em contextos genéricos e não genéricos.

O exemplo de código define dois tipos genéricos, G1<Tg1> e G2<Tg2>, cada um deles tem um método genérico. G1<Tg1> também tem um método não genérico que usa o parâmetro Tg1 de tipo para seu parâmetro. O método GM2<Tgm2> genérico no tipo G2<Tg2> contém várias chamadas de método:

  • Caso 1: o método GM1<Tgm1> genérico é chamado, usando os parâmetros de tipo de G2<Tg2> e GM2<Tgm2> como os argumentos de tipo. Em outras palavras, os tipos de parâmetro do método chamado dependerão dos tipos usados para construir um tipo genérico fechado a partir da definição de tipo para G2<Tg2>.

  • Caso 2: o método M1 não genérico é chamado. O parâmetro desse método usa o parâmetro de tipo do tipo definidor, G1<Tg1>, que é substituído nesse caso pelo parâmetro de tipo do tipo delimitador, G2<Tg2>.

  • Caso 3: o método GM1<Tgm1> genérico é chamado, especificando Int32 e Object para os argumentos de tipo do tipo genérico e do método genérico, respectivamente. Essa chamada de método não depende dos parâmetros de tipo do tipo ou método delimitante.

  • Caso 4: o método M1 não genérico da Example classe é chamado. Essa chamada de método não depende dos parâmetros de tipo do tipo ou método delimitante.

Além disso, o exemplo define a classe não genérica Example . Essa classe tem um método M que faz uma chamada para um método genérico.

  • Caso 5: o método GM1<Tgm1> genérico é chamado, especificando Int32 e Object para os argumentos de tipo do tipo genérico e do método genérico, respectivamente. O contexto para esse método não tem nenhum tipo genérico ou método genérico.

Para cada caso, o exemplo primeiro constrói um MethodInfo que representa o método chamado e, em seguida, resolve o token usando a sobrecarga do ResolveMethod(Int32, Type[], Type[]) método, usando os Type.GetGenericArguments métodos e MethodInfo.GetGenericArguments para obter os valores dos genericTypeArguments parâmetros e genericMethodArguments . Essa técnica funciona em todos os casos, pois os métodos retornam Type.EmptyTypes para contextos não genéricos. O exemplo compara o resolvido MethodInfo com o construído MethodInfo.

Em seguida, o exemplo tenta usar a sobrecarga do ResolveMethod(Int32) método para resolve o token. Isso funciona nos casos 3, 4 e 5, porque as chamadas de método não dependem do contexto genérico. Nos casos 1 e 2, uma exceção é gerada porque não há informações suficientes para resolve o token.

Os valores do token de metadados são codificados como uma enumeração. Se você alterar esse exemplo de código, os valores de token provavelmente serão alterados. Para determinar os novos valores de token, compile o código e use Ildasm.exe com a opção /TOKENS para examinar o assembly. Os tokens podem ser encontrados nos pontos de chamada. Insira os novos valores na enumeração e recompile o exemplo.

using System;
using System.Reflection;

namespace ResolveMethodExample
{
    // Metadata tokens for the MethodRefs that are to be resolved.
    // If you change this program, some or all of these metadata tokens might
    // change. The new token values can be discovered by compiling the example
    // and examining the assembly with Ildasm.exe, using the /TOKENS option.
    // Recompile the program after correcting the token values.
    enum Tokens
    {
        Case1 = 0x2b000001,
        Case2 = 0x0A000006,
        Case3 = 0x2b000002,
        Case4 = 0x06000006,
        Case5 = 0x2b000002
    }

    class G1<Tg1>
    {
        public void GM1<Tgm1> (Tg1 param1, Tgm1 param2) {}
        public void M1(Tg1 param) {}
    }

    class G2<Tg2>
    {
        public void GM2<Tgm2> (Tg2 param1, Tgm2 param2)
        {
            // Case 1: A generic method call that depends on its generic
            // context, because it uses the type parameters of the enclosing
            // generic type G2 and the enclosing generic method GM2. The token
            // for the MethodSpec is Tokens.Case1.
            G1<Tg2> g = new G1<Tg2>();
            g.GM1<Tgm2>(param1, param2);

            // Case 2: A non-generic method call that depends on its generic
            // context, because it uses the type parameter of the enclosing
            // generic type G2. The token for the MemberRef is Tokens.Case2.
            g.M1(param1);

            // Case 3: A generic method call that does not depend on its generic
            // context, because it does not use type parameters of the enclosing
            // generic type or method. The token for the MethodSpec is Tokens.Case3.
            G1<int> gi = new G1<int>();
            gi.GM1<object>(42, new Object());

            // Case 4: A non-generic method call that does not depend on its
            // generic context, because it does not use the type parameters of the
            // enclosing generic type or method. The token for the MethodDef is
            // Tokens.Case4.
            Example e = new Example();
            e.M();
        }
    }

    class Example
    {
        public void M()
        {
            G1<int> g = new G1<int>();
            // Case 5: A generic method call that does not have any generic
            // context. The token for the MethodSpec is Tokens.Case5.
            g.GM1<object>(42, new Object());
        }

        static void Main ()
        {
            Module mod = typeof(Example).Assembly.ManifestModule;
            MethodInfo miResolved2 = null;

            // Case 1: A generic method call that is dependent on its generic context.
            //
            // Create and display a MethodInfo representing the MethodSpec of the
            // generic method g.GM1<Tgm2>() that is called in G2<Tg2>.GM2<Tgm2>().
            Type t = typeof(G1<>).MakeGenericType(typeof(G2<>).GetGenericArguments());
            MethodInfo mi = typeof(G2<>).GetMethod("GM2");
            MethodInfo miTest = t.GetMethod("GM1").MakeGenericMethod(mi.GetGenericArguments());
            Console.WriteLine("\nCase 1:\n{0}", miTest);

            // Resolve the MethodSpec token for method G1<Tg2>.GM1<Tgm2>(), which
            // is called in method G2<Tg2>.GM2<Tgm2>(). The GetGenericArguments method
            // must be used to obtain the context for resolving the method.
            MethodInfo miResolved = (MethodInfo) mod.ResolveMethod(
                (int)Tokens.Case1,
                typeof(G2<>).GetGenericArguments(),
                typeof(G2<>).GetMethod("GM2").GetGenericArguments());
            Console.WriteLine(miResolved);
            Console.WriteLine("Is the resolved method the same? {0}", miResolved == miTest);

            // The overload that doesn't specify generic context throws an exception
            // because there is insufficient context to resolve the token.
            try
            {
                miResolved2 = (MethodInfo) mod.ResolveMethod((int)Tokens.Case1);
            }
            catch (Exception ex)
            {
                Console.WriteLine("{0}: {1}", ex.GetType(), ex.Message);
            }

            // Case 2: A non-generic method call that is dependent on its generic context.
            //
            // Create and display a MethodInfo representing the MemberRef of the
            // non-generic method g.M1() that is called in G2<Tg2>.GM2<Tgm2>().
            t = typeof(G1<>).MakeGenericType(typeof(G2<>).GetGenericArguments());
            miTest = t.GetMethod("M1");
            Console.WriteLine("\nCase 2:\n{0}", miTest);

            // Resolve the MemberRef token for method G1<Tg2>.M1(), which is
            // called in method G2<Tg2>.GM2<Tgm2>(). The GetGenericArguments method
            // must be used to obtain the context for resolving the method, because
            // the method parameter comes from the generic type G1, and the type
            // argument, Tg2, comes from the generic type that encloses the call.
            // There is no enclosing generic method, so the value Type.EmptyTypes
            // could be passed for the genericMethodArguments parameter.
            miResolved = (MethodInfo) mod.ResolveMethod(
                (int)Tokens.Case2,
                typeof(G2<>).GetGenericArguments(),
                typeof(G2<>).GetMethod("GM2").GetGenericArguments());
            Console.WriteLine(miResolved);
            Console.WriteLine("Is the resolved method the same? {0}", miResolved == miTest);

            // The overload that doesn't specify generic context throws an exception
            // because there is insufficient context to resolve the token.
            try
            {
                miResolved2 = (MethodInfo) mod.ResolveMethod((int)Tokens.Case2);
            }
            catch (Exception ex)
            {
                Console.WriteLine("{0}: {1}", ex.GetType(), ex.Message);
            }

            // Case 3: A generic method call that is independent of its generic context.
            //
            // Create and display a MethodInfo representing the MethodSpec of the
            // generic method gi.GM1<object>() that is called in G2<Tg2>.GM2<Tgm2>().
            mi = typeof(G1<int>).GetMethod("GM1");
            miTest = mi.MakeGenericMethod(new Type[] { typeof(object) });
            Console.WriteLine("\nCase 3:\n{0}", miTest);

            // Resolve the token for method G1<int>.GM1<object>(), which is called
            // in G2<Tg2>.GM2<Tgm2>(). The GetGenericArguments method is used to
            // obtain the context for resolving the method, but the method call in
            // this case does not use type parameters of the enclosing type or
            // method, so Type.EmptyTypes could be used for both arguments.
            miResolved = (MethodInfo) mod.ResolveMethod(
                (int)Tokens.Case3,
                typeof(G2<>).GetGenericArguments(),
                typeof(G2<>).GetMethod("GM2").GetGenericArguments());
            Console.WriteLine(miResolved);
            Console.WriteLine("Is the resolved method the same? {0}", miResolved == miTest);

            // The method call in this case does not depend on the enclosing generic
            // context, so the token can also be resolved by the simpler overload.
            miResolved2 = (MethodInfo) mod.ResolveMethod((int)Tokens.Case3);

            // Case 4: A non-generic method call that is independent of its generic context.
            //
            // Create and display a MethodInfo representing the MethodDef of the
            // method e.M() that is called in G2<Tg2>.GM2<Tgm2>().
            miTest = typeof(Example).GetMethod("M");
            Console.WriteLine("\nCase 4:\n{0}", miTest);

            // Resolve the token for method Example.M(), which is called in
            // G2<Tg2>.GM2<Tgm2>(). The GetGenericArguments method is used to
            // obtain the context for resolving the method, but the non-generic
            // method call does not use type parameters of the enclosing type or
            // method, so Type.EmptyTypes could be used for both arguments.
            miResolved = (MethodInfo) mod.ResolveMethod(
                (int)Tokens.Case4,
                typeof(G2<>).GetGenericArguments(),
                typeof(G2<>).GetMethod("GM2").GetGenericArguments());
            Console.WriteLine(miResolved);
            Console.WriteLine("Is the resolved method the same? {0}", miResolved == miTest);

            // The method call in this case does not depend on any enclosing generic
            // context, so the token can also be resolved by the simpler overload.
            miResolved2 = (MethodInfo) mod.ResolveMethod((int)Tokens.Case4);

            // Case 5: Generic method call in a non-generic context.
            //
            // Create and display a MethodInfo representing the MethodRef of the
            // closed generic method g.GM1<object>() that is called in Example.M().
            mi = typeof(G1<int>).GetMethod("GM1");
            miTest = mi.MakeGenericMethod(new Type[] { typeof(object) });
            Console.WriteLine("\nCase 5:\n{0}", miTest);

            // Resolve the token for method G1<int>.GM1<object>(), which is called
            // in method Example.M(). The GetGenericArguments method is used to
            // obtain the context for resolving the method, but the enclosing type
            // and method are not generic, so Type.EmptyTypes could be used for
            // both arguments.
            miResolved = (MethodInfo) mod.ResolveMethod(
                (int)Tokens.Case5,
                typeof(Example).GetGenericArguments(),
                typeof(Example).GetMethod("M").GetGenericArguments());
            Console.WriteLine(miResolved);
            Console.WriteLine("Is the resolved method the same? {0}", miResolved == miTest);

            // The method call in this case does not depend on any enclosing generic
            // context, so the token can also be resolved by the simpler overload.
            miResolved2 = (MethodInfo) mod.ResolveMethod((int)Tokens.Case5);
        }
    }
}
/* This example produces the following output:

Case 1:
Void GM1[Tgm2](Tg2, Tgm2)
Void GM1[Tgm2](Tg2, Tgm2)
Is the resolved method the same? True
System.ArgumentException: A BadImageFormatException has been thrown while parsing the signature. This is likely due to lack of a generic context. Ensure genericTypeArguments and genericMethodArguments are provided and contain enough context.

Case 2:
Void M1(Tg2)
Void M1(Tg2)
Is the resolved method the same? True
System.ArgumentException: A BadImageFormatException has been thrown while parsing the signature. This is likely due to lack of a generic context. Ensure genericTypeArguments and genericMethodArguments are provided and contain enough context.

Case 3:
Void GM1[Object](Int32, System.Object)
Void GM1[Object](Int32, System.Object)
Is the resolved method the same? True

Case 4:
Void M()
Void M()
Is the resolved method the same? True

Case 5:
Void GM1[Object](Int32, System.Object)
Void GM1[Object](Int32, System.Object)
Is the resolved method the same? True
 */

Imports System.Reflection

Namespace ResolveMethodExample

    ' Metadata tokens for the MethodRefs that are to be resolved.
    ' If you change this program, some or all of these metadata tokens might
    ' change. The new token values can be discovered by compiling the example
    ' and examining the assembly with Ildasm.exe, using the /TOKENS option. 
    ' Recompile the program after correcting the token values. 
    Enum Tokens
        Case1 = &H2B000003
        Case2 = &HA00001F
        Case3 = &H2B000004
        Case4 = &H6000017
        Case5 = &H2B000004
    End Enum 


    Class G1(Of Tg1)

        Public Sub GM1(Of Tgm1) (ByVal param1 As Tg1, ByVal param2 As Tgm1)
        End Sub

        Public Sub M1(ByVal param As Tg1)
        End Sub
    End Class

    Class G2(Of Tg2)
    
        Public Sub GM2(Of Tgm2) (ByVal param1 As Tg2, ByVal param2 As Tgm2)
        
            ' Case 1: A generic method call that depends on its generic 
            ' context, because it uses the type parameters of the enclosing
            ' generic type G2 and the enclosing generic method GM2. The token 
            ' for the MethodSpec is Tokens.Case1.
            Dim g As New G1(Of Tg2)()
            g.GM1(Of Tgm2)(param1, param2)

            ' Case 2: A non-generic method call that depends on its generic 
            ' context, because it uses the type parameter of the enclosing
            ' generic type G2. The token for the MemberRef is Tokens.Case2.
            g.M1(param1)

            ' Case 3: A generic method call that does not depend on its generic 
            ' context, because it does not use type parameters of the enclosing
            ' generic type or method. The token for the MethodSpec is Tokens.Case3.
            Dim gi As New G1(Of Integer)()
            gi.GM1(Of Object)(42, New Object())

            ' Case 4: A non-generic method call that does not depend on its 
            ' generic context, because it does not use the type parameters of the
            ' enclosing generic type or method. The token for the MethodDef is 
            ' Tokens.Case4.
            Dim e As New Example()
            e.M()
        End Sub 
    End Class

    Class Example
        Public Sub M() 
            Dim g As New G1(Of Integer)()
            ' Case 5: A generic method call that does not have any generic 
            ' context. The token for the MethodSpec is Tokens.Case5.
            g.GM1(Of Object)(42, New Object())
        End Sub 
    
        Shared Sub Main() 
            Dim m As [Module] = GetType(Example).Assembly.ManifestModule
            Dim miResolved2 As MethodInfo = Nothing
        
            ' Case 1: A generic method call that is dependent on its generic context.
            '
            ' Create and display a MethodInfo representing the MethodSpec of the 
            ' generic method g.GM1(Of Tgm2)() that is called in G2(Of Tg2).GM2(Of Tgm2)().
            Dim t As Type = GetType(G1(Of )).MakeGenericType(GetType(G2(Of )).GetGenericArguments())
            Dim mi As MethodInfo = GetType(G2(Of )).GetMethod("GM2")
            Dim miTest As MethodInfo = t.GetMethod("GM1").MakeGenericMethod(mi.GetGenericArguments())
            Console.WriteLine(vbCrLf & "Case 1:" & vbCrLf & miTest.ToString())
        
            ' Resolve the MethodSpec token for method G1(Of Tg2).GM1(Of Tgm2)(), which 
            ' is called in method G2(Of Tg2).GM2(Of Tgm2)(). The GetGenericArguments 
            ' method must be used to obtain the context for resolving the method.
            Dim miResolved As MethodInfo = CType(m.ResolveMethod( _
                    CInt(Tokens.Case1), _
                    GetType(G2(Of )).GetGenericArguments(), _
                    GetType(G2(Of )).GetMethod("GM2").GetGenericArguments()), _
                MethodInfo)
            Console.WriteLine(miResolved)
            Console.WriteLine("Is the resolved method the same? {0}", miResolved Is miTest)
        
            ' The overload that doesn't specify generic context throws an exception
            ' because there is insufficient context to resolve the token.
            Try
                miResolved2 = CType(m.ResolveMethod(CInt(Tokens.Case1)), MethodInfo)
            Catch ex As Exception
                Console.WriteLine("{0}: {1}", ex.GetType(), ex.Message)
            End Try
        
        
            ' Case 2: A non-generic method call that is dependent on its generic context.
            '
            ' Create and display a MethodInfo representing the MemberRef of the 
            ' non-generic method g.M1() that is called in G2(Of Tg2).GM2(Of Tgm2)().
            t = GetType(G1(Of )).MakeGenericType(GetType(G2(Of )).GetGenericArguments())
            miTest = t.GetMethod("M1")
            Console.WriteLine(vbCrLf & "Case 2:" & vbCrLf & miTest.ToString())
        
            ' Resolve the MemberRef token for method G1(Of Tg2).M1(), which is
            ' called in method G2(Of Tg2).GM2(Of Tgm2)(). The GetGenericArguments 
            ' method must be used to obtain the context for resolving the method, 
            ' because the method parameter comes from the generic type G1, and the 
            ' because argument, Tg2, comes from the generic type that encloses the 
            ' call. There is no enclosing generic method, so Type.EmptyTypes could
            ' be passed for the genericMethodArguments parameter.
            miResolved = CType(m.ResolveMethod( _
                    CInt(Tokens.Case2), _
                    GetType(G2(Of )).GetGenericArguments(), _
                    GetType(G2(Of )).GetMethod("GM2").GetGenericArguments()), _
                MethodInfo)
            Console.WriteLine(miResolved)
            Console.WriteLine("Is the resolved method the same? {0}", miResolved Is miTest)
        
            ' The overload that doesn't specify generic context throws an exception
            ' because there is insufficient context to resolve the token.
            Try
                miResolved2 = CType(m.ResolveMethod(CInt(Tokens.Case2)), MethodInfo)
            Catch ex As Exception
                Console.WriteLine("{0}: {1}", ex.GetType(), ex.Message)
            End Try
        
        
            ' Case 3: A generic method call that is independent of its generic context.
            '
            ' Create and display a MethodInfo representing the MethodSpec of the 
            ' generic method gi.GM1(Of Object)() that is called in G2(Of Tg2).GM2(Of Tgm2)().
            mi = GetType(G1(Of Integer)).GetMethod("GM1")
            miTest = mi.MakeGenericMethod(New Type() {GetType(Object)})
            Console.WriteLine(vbCrLf & "Case 3:" & vbCrLf & miTest.ToString())
        
            ' Resolve the token for method G1(Of Integer).GM1(Of Object)(), which is 
            ' calledin G2(Of Tg2).GM2(Of Tgm2)(). The GetGenericArguments method is  
            ' used to obtain the context for resolving the method, but the method call
            ' in this case does not use type parameters of the enclosing type or
            ' method, so Type.EmptyTypes could be used for both arguments.
            miResolved = CType(m.ResolveMethod( _
                    CInt(Tokens.Case3), _
                    GetType(G2(Of )).GetGenericArguments(), _
                    GetType(G2(Of )).GetMethod("GM2").GetGenericArguments()), _
                MethodInfo)
            Console.WriteLine(miResolved)
            Console.WriteLine("Is the resolved method the same? {0}", miResolved Is miTest)
        
            ' The method call in this case does not depend on the enclosing generic
            ' context, so the token can also be resolved by the simpler overload.
            miResolved2 = CType(m.ResolveMethod(CInt(Tokens.Case3)), MethodInfo)
        
        
            ' Case 4: A non-generic method call that is independent of its generic context.
            '
            ' Create and display a MethodInfo representing the MethodDef of the 
            ' method e.M() that is called in G2(Of Tg2).GM2(Of Tgm2)().
            miTest = GetType(Example).GetMethod("M")
            Console.WriteLine(vbCrLf & "Case 4:" & vbCrLf & miTest.ToString())
        
            ' Resolve the token for method Example.M(), which is called in
            ' G2(Of Tg2).GM2(Of Tgm2)(). The GetGenericArguments method is used to 
            ' obtain the context for resolving the method, but the non-generic 
            ' method call does not use type parameters of the enclosing type or
            ' method, so Type.EmptyTypes could be used for both arguments.
            miResolved = CType(m.ResolveMethod( _
                    CInt(Tokens.Case4), _
                    GetType(G2(Of )).GetGenericArguments(), _
                    GetType(G2(Of )).GetMethod("GM2").GetGenericArguments()), _
                MethodInfo)
            Console.WriteLine(miResolved)
            Console.WriteLine("Is the resolved method the same? {0}", miResolved Is miTest)
        
            ' The method call in this case does not depend on any enclosing generic
            ' context, so the token can also be resolved by the simpler overload.
            miResolved2 = CType(m.ResolveMethod(CInt(Tokens.Case4)), MethodInfo)
        
        
            ' Case 5: Generic method call in a non-generic context.
            '
            ' Create and display a MethodInfo representing the MethodRef of the 
            ' closed generic method g.GM1(Of Object)() that is called in Example.M().
            mi = GetType(G1(Of Integer)).GetMethod("GM1")
            miTest = mi.MakeGenericMethod(New Type() {GetType(Object)})
            Console.WriteLine(vbCrLf & "Case 5:" & vbCrLf & miTest.ToString())
        
            ' Resolve the token for method G1(Of Integer).GM1(Of Object)(), which is 
            ' called in method Example.M(). The GetGenericArguments method is used to 
            ' obtain the context for resolving the method, but the enclosing type
            ' and method are not generic, so Type.EmptyTypes could be used for
            ' both arguments.
            miResolved = CType(m.ResolveMethod( _
                    CInt(Tokens.Case5), _
                    GetType(Example).GetGenericArguments(), _
                    GetType(Example).GetMethod("M").GetGenericArguments()), _
                MethodInfo)
            Console.WriteLine(miResolved)
            Console.WriteLine("Is the resolved method the same? {0}", miResolved Is miTest)
        
            ' The method call in this case does not depend on any enclosing generic
            ' context, so the token can also be resolved by the simpler overload.
            miResolved2 = CType(m.ResolveMethod(CInt(Tokens.Case5)), MethodInfo)
    
        End Sub 
    End Class 
End Namespace

' This example produces the following output:
'
'Case 1:
'Void GM1[Tgm2](Tg2, Tgm2)
'Void GM1[Tgm2](Tg2, Tgm2)
'Is the resolved method the same? True
'System.ArgumentException: A BadImageFormatException has been thrown while parsing the signature. This is likely due to lack of a generic context. Ensure genericTypeArguments and genericMethodArguments are provided and contain enough context.
'
'Case 2:
'Void M1(Tg2)
'Void M1(Tg2)
'Is the resolved method the same? True
'System.ArgumentException: A BadImageFormatException has been thrown while parsing the signature. This is likely due to lack of a generic context. Ensure genericTypeArguments and genericMethodArguments are provided and contain enough context.
'
'Case 3:
'Void GM1[Object](Int32, System.Object)
'Void GM1[Object](Int32, System.Object)
'Is the resolved method the same? True
'
'Case 4:
'Void M()
'Void M()
'Is the resolved method the same? True
'
'Case 5:
'Void GM1[Object](Int32, System.Object)
'Void GM1[Object](Int32, System.Object)
'Is the resolved method the same? True
'

Comentários

Use o Type.GetGenericArguments método no tipo em que metadataToken está no escopo para obter uma matriz de argumentos de tipo genérico para genericTypeArguments. Use o MethodInfo.GetGenericArguments método no método em que metadataToken está no escopo para obter uma matriz de argumentos de tipo genérico para genericMethodArguments. É sempre seguro fornecer esses argumentos, mesmo quando eles não são necessários.

Observação

Informações sobre tokens de metadados podem ser encontradas na documentação da CLI (Common Language Infrastructure), especialmente "Partição II: Definição de Metadados e Semântica". Para obter mais informações, consulte CLI (Common Language Infrastructure) do ECMA 335.

Aplica-se a

ResolveMethod(Int32)

Origem:
Module.cs
Origem:
Module.cs
Origem:
Module.cs

Retorna o método ou o construtor identificado pelo token de metadados especificado.

public:
 System::Reflection::MethodBase ^ ResolveMethod(int metadataToken);
public System.Reflection.MethodBase? ResolveMethod (int metadataToken);
public System.Reflection.MethodBase ResolveMethod (int metadataToken);
member this.ResolveMethod : int -> System.Reflection.MethodBase
Public Function ResolveMethod (metadataToken As Integer) As MethodBase

Parâmetros

metadataToken
Int32

Um token de metadados que identifica um método ou um construtor no módulo.

Retornos

MethodBase

Um objeto MethodBase que representa o método ou construtor identificado pelo token de metadados especificado.

Exceções

ArgumentException

metadataToken não é um token de um método ou construtor no escopo do módulo atual.

- ou -

metadataToken é um MethodSpec cuja assinatura contém o tipo de elemento var (um parâmetro de tipo de um tipo genérico) ou mvar (um parâmetro de tipo de um método genérico).

ArgumentOutOfRangeException

metadataToken não é um token válido no escopo do módulo atual.

Exemplos

O exemplo a seguir mostra como usar as duas sobrecargas do ResolveMethod método para resolve tokens de metadados de sites de chamada em contextos genéricos e não genéricos.

O exemplo de código define dois tipos genéricos, G1<Tg1> e G2<Tg2> (G1(Of Tg1) e G2(Of Tg2) no Visual Basic), cada um deles tem um método genérico. G1<Tg1> também tem um método não genérico que usa o parâmetro Tg1 de tipo para seu parâmetro. O método GM2<Tgm2> genérico no tipo G2<Tg2> contém várias chamadas de método:

  • Caso 1: o método GM1<Tgm1> genérico é chamado, usando os parâmetros de tipo de G2<Tg2> e GM2<Tgm2> como os argumentos de tipo. Em outras palavras, os tipos de parâmetro do método chamado dependerão dos tipos usados para construir um tipo genérico fechado a partir da definição de tipo para G2<Tg2>.

  • Caso 2: o método M1 não genérico é chamado. O parâmetro desse método usa o parâmetro de tipo do tipo definidor, G1<Tg1>, que é substituído nesse caso pelo parâmetro de tipo do tipo delimitador, G2<Tg2>.

  • Caso 3: o método GM1<Tgm1> genérico é chamado, especificando Int32 e Object para os argumentos de tipo do tipo genérico e do método genérico, respectivamente. Essa chamada de método não depende dos parâmetros de tipo do tipo ou método delimitante.

  • Caso 4: o método M1 não genérico da Example classe é chamado. Essa chamada de método não depende dos parâmetros de tipo do tipo ou método delimitante.

Além disso, o exemplo define a classe não genérica Example . Essa classe tem um método M que faz uma chamada para um método genérico:

  • Caso 5: o método GM1 genérico é chamado, especificando Int32 e Object para os argumentos de tipo do tipo genérico e do método genérico, respectivamente. O contexto para esse método não tem nenhum tipo genérico ou método genérico.

Para cada caso, o exemplo primeiro constrói um MethodInfo que representa o método chamado e, em seguida, resolve o token usando a sobrecarga do ResolveMethod(Int32, Type[], Type[]) método, usando os Type.GetGenericArguments métodos e MethodInfo.GetGenericArguments para obter os valores dos genericTypeArguments parâmetros e genericMethodArguments . Essa técnica funciona em todos os casos, pois os métodos retornam Type.EmptyTypes para contextos não genéricos. O exemplo compara o resolvido MethodInfo com o construído MethodInfo.

Em seguida, o exemplo tenta usar a sobrecarga do ResolveMethod(Int32) método para resolve o token. Isso funciona nos casos 3, 4 e 5, porque as chamadas de método não dependem do contexto genérico. Nos casos 1 e 2, uma exceção é gerada porque não há informações suficientes para resolve o token.

Os valores do token de metadados são codificados como uma enumeração. Se você alterar esse exemplo de código, os valores de token provavelmente serão alterados. Para determinar os novos valores de token, compile o código e use Ildasm.exe com a opção /TOKENS para examinar o assembly. Os tokens podem ser encontrados nos pontos de chamada. Insira os novos valores na enumeração e recompile o exemplo.

using System;
using System.Reflection;

namespace ResolveMethodExample
{
    // Metadata tokens for the MethodRefs that are to be resolved.
    // If you change this program, some or all of these metadata tokens might
    // change. The new token values can be discovered by compiling the example
    // and examining the assembly with Ildasm.exe, using the /TOKENS option.
    // Recompile the program after correcting the token values.
    enum Tokens
    {
        Case1 = 0x2b000001,
        Case2 = 0x0A000006,
        Case3 = 0x2b000002,
        Case4 = 0x06000006,
        Case5 = 0x2b000002
    }

    class G1<Tg1>
    {
        public void GM1<Tgm1> (Tg1 param1, Tgm1 param2) {}
        public void M1(Tg1 param) {}
    }

    class G2<Tg2>
    {
        public void GM2<Tgm2> (Tg2 param1, Tgm2 param2)
        {
            // Case 1: A generic method call that depends on its generic
            // context, because it uses the type parameters of the enclosing
            // generic type G2 and the enclosing generic method GM2. The token
            // for the MethodSpec is Tokens.Case1.
            G1<Tg2> g = new G1<Tg2>();
            g.GM1<Tgm2>(param1, param2);

            // Case 2: A non-generic method call that depends on its generic
            // context, because it uses the type parameter of the enclosing
            // generic type G2. The token for the MemberRef is Tokens.Case2.
            g.M1(param1);

            // Case 3: A generic method call that does not depend on its generic
            // context, because it does not use type parameters of the enclosing
            // generic type or method. The token for the MethodSpec is Tokens.Case3.
            G1<int> gi = new G1<int>();
            gi.GM1<object>(42, new Object());

            // Case 4: A non-generic method call that does not depend on its
            // generic context, because it does not use the type parameters of the
            // enclosing generic type or method. The token for the MethodDef is
            // Tokens.Case4.
            Example e = new Example();
            e.M();
        }
    }

    class Example
    {
        public void M()
        {
            G1<int> g = new G1<int>();
            // Case 5: A generic method call that does not have any generic
            // context. The token for the MethodSpec is Tokens.Case5.
            g.GM1<object>(42, new Object());
        }

        static void Main ()
        {
            Module mod = typeof(Example).Assembly.ManifestModule;
            MethodInfo miResolved2 = null;

            // Case 1: A generic method call that is dependent on its generic context.
            //
            // Create and display a MethodInfo representing the MethodSpec of the
            // generic method g.GM1<Tgm2>() that is called in G2<Tg2>.GM2<Tgm2>().
            Type t = typeof(G1<>).MakeGenericType(typeof(G2<>).GetGenericArguments());
            MethodInfo mi = typeof(G2<>).GetMethod("GM2");
            MethodInfo miTest = t.GetMethod("GM1").MakeGenericMethod(mi.GetGenericArguments());
            Console.WriteLine("\nCase 1:\n{0}", miTest);

            // Resolve the MethodSpec token for method G1<Tg2>.GM1<Tgm2>(), which
            // is called in method G2<Tg2>.GM2<Tgm2>(). The GetGenericArguments method
            // must be used to obtain the context for resolving the method.
            MethodInfo miResolved = (MethodInfo) mod.ResolveMethod(
                (int)Tokens.Case1,
                typeof(G2<>).GetGenericArguments(),
                typeof(G2<>).GetMethod("GM2").GetGenericArguments());
            Console.WriteLine(miResolved);
            Console.WriteLine("Is the resolved method the same? {0}", miResolved == miTest);

            // The overload that doesn't specify generic context throws an exception
            // because there is insufficient context to resolve the token.
            try
            {
                miResolved2 = (MethodInfo) mod.ResolveMethod((int)Tokens.Case1);
            }
            catch (Exception ex)
            {
                Console.WriteLine("{0}: {1}", ex.GetType(), ex.Message);
            }

            // Case 2: A non-generic method call that is dependent on its generic context.
            //
            // Create and display a MethodInfo representing the MemberRef of the
            // non-generic method g.M1() that is called in G2<Tg2>.GM2<Tgm2>().
            t = typeof(G1<>).MakeGenericType(typeof(G2<>).GetGenericArguments());
            miTest = t.GetMethod("M1");
            Console.WriteLine("\nCase 2:\n{0}", miTest);

            // Resolve the MemberRef token for method G1<Tg2>.M1(), which is
            // called in method G2<Tg2>.GM2<Tgm2>(). The GetGenericArguments method
            // must be used to obtain the context for resolving the method, because
            // the method parameter comes from the generic type G1, and the type
            // argument, Tg2, comes from the generic type that encloses the call.
            // There is no enclosing generic method, so the value Type.EmptyTypes
            // could be passed for the genericMethodArguments parameter.
            miResolved = (MethodInfo) mod.ResolveMethod(
                (int)Tokens.Case2,
                typeof(G2<>).GetGenericArguments(),
                typeof(G2<>).GetMethod("GM2").GetGenericArguments());
            Console.WriteLine(miResolved);
            Console.WriteLine("Is the resolved method the same? {0}", miResolved == miTest);

            // The overload that doesn't specify generic context throws an exception
            // because there is insufficient context to resolve the token.
            try
            {
                miResolved2 = (MethodInfo) mod.ResolveMethod((int)Tokens.Case2);
            }
            catch (Exception ex)
            {
                Console.WriteLine("{0}: {1}", ex.GetType(), ex.Message);
            }

            // Case 3: A generic method call that is independent of its generic context.
            //
            // Create and display a MethodInfo representing the MethodSpec of the
            // generic method gi.GM1<object>() that is called in G2<Tg2>.GM2<Tgm2>().
            mi = typeof(G1<int>).GetMethod("GM1");
            miTest = mi.MakeGenericMethod(new Type[] { typeof(object) });
            Console.WriteLine("\nCase 3:\n{0}", miTest);

            // Resolve the token for method G1<int>.GM1<object>(), which is called
            // in G2<Tg2>.GM2<Tgm2>(). The GetGenericArguments method is used to
            // obtain the context for resolving the method, but the method call in
            // this case does not use type parameters of the enclosing type or
            // method, so Type.EmptyTypes could be used for both arguments.
            miResolved = (MethodInfo) mod.ResolveMethod(
                (int)Tokens.Case3,
                typeof(G2<>).GetGenericArguments(),
                typeof(G2<>).GetMethod("GM2").GetGenericArguments());
            Console.WriteLine(miResolved);
            Console.WriteLine("Is the resolved method the same? {0}", miResolved == miTest);

            // The method call in this case does not depend on the enclosing generic
            // context, so the token can also be resolved by the simpler overload.
            miResolved2 = (MethodInfo) mod.ResolveMethod((int)Tokens.Case3);

            // Case 4: A non-generic method call that is independent of its generic context.
            //
            // Create and display a MethodInfo representing the MethodDef of the
            // method e.M() that is called in G2<Tg2>.GM2<Tgm2>().
            miTest = typeof(Example).GetMethod("M");
            Console.WriteLine("\nCase 4:\n{0}", miTest);

            // Resolve the token for method Example.M(), which is called in
            // G2<Tg2>.GM2<Tgm2>(). The GetGenericArguments method is used to
            // obtain the context for resolving the method, but the non-generic
            // method call does not use type parameters of the enclosing type or
            // method, so Type.EmptyTypes could be used for both arguments.
            miResolved = (MethodInfo) mod.ResolveMethod(
                (int)Tokens.Case4,
                typeof(G2<>).GetGenericArguments(),
                typeof(G2<>).GetMethod("GM2").GetGenericArguments());
            Console.WriteLine(miResolved);
            Console.WriteLine("Is the resolved method the same? {0}", miResolved == miTest);

            // The method call in this case does not depend on any enclosing generic
            // context, so the token can also be resolved by the simpler overload.
            miResolved2 = (MethodInfo) mod.ResolveMethod((int)Tokens.Case4);

            // Case 5: Generic method call in a non-generic context.
            //
            // Create and display a MethodInfo representing the MethodRef of the
            // closed generic method g.GM1<object>() that is called in Example.M().
            mi = typeof(G1<int>).GetMethod("GM1");
            miTest = mi.MakeGenericMethod(new Type[] { typeof(object) });
            Console.WriteLine("\nCase 5:\n{0}", miTest);

            // Resolve the token for method G1<int>.GM1<object>(), which is called
            // in method Example.M(). The GetGenericArguments method is used to
            // obtain the context for resolving the method, but the enclosing type
            // and method are not generic, so Type.EmptyTypes could be used for
            // both arguments.
            miResolved = (MethodInfo) mod.ResolveMethod(
                (int)Tokens.Case5,
                typeof(Example).GetGenericArguments(),
                typeof(Example).GetMethod("M").GetGenericArguments());
            Console.WriteLine(miResolved);
            Console.WriteLine("Is the resolved method the same? {0}", miResolved == miTest);

            // The method call in this case does not depend on any enclosing generic
            // context, so the token can also be resolved by the simpler overload.
            miResolved2 = (MethodInfo) mod.ResolveMethod((int)Tokens.Case5);
        }
    }
}
/* This example produces the following output:

Case 1:
Void GM1[Tgm2](Tg2, Tgm2)
Void GM1[Tgm2](Tg2, Tgm2)
Is the resolved method the same? True
System.ArgumentException: A BadImageFormatException has been thrown while parsing the signature. This is likely due to lack of a generic context. Ensure genericTypeArguments and genericMethodArguments are provided and contain enough context.

Case 2:
Void M1(Tg2)
Void M1(Tg2)
Is the resolved method the same? True
System.ArgumentException: A BadImageFormatException has been thrown while parsing the signature. This is likely due to lack of a generic context. Ensure genericTypeArguments and genericMethodArguments are provided and contain enough context.

Case 3:
Void GM1[Object](Int32, System.Object)
Void GM1[Object](Int32, System.Object)
Is the resolved method the same? True

Case 4:
Void M()
Void M()
Is the resolved method the same? True

Case 5:
Void GM1[Object](Int32, System.Object)
Void GM1[Object](Int32, System.Object)
Is the resolved method the same? True
 */

Imports System.Reflection

Namespace ResolveMethodExample

    ' Metadata tokens for the MethodRefs that are to be resolved.
    ' If you change this program, some or all of these metadata tokens might
    ' change. The new token values can be discovered by compiling the example
    ' and examining the assembly with Ildasm.exe, using the /TOKENS option. 
    ' Recompile the program after correcting the token values. 
    Enum Tokens
        Case1 = &H2B000003
        Case2 = &HA00001F
        Case3 = &H2B000004
        Case4 = &H6000017
        Case5 = &H2B000004
    End Enum 


    Class G1(Of Tg1)

        Public Sub GM1(Of Tgm1) (ByVal param1 As Tg1, ByVal param2 As Tgm1)
        End Sub

        Public Sub M1(ByVal param As Tg1)
        End Sub
    End Class

    Class G2(Of Tg2)
    
        Public Sub GM2(Of Tgm2) (ByVal param1 As Tg2, ByVal param2 As Tgm2)
        
            ' Case 1: A generic method call that depends on its generic 
            ' context, because it uses the type parameters of the enclosing
            ' generic type G2 and the enclosing generic method GM2. The token 
            ' for the MethodSpec is Tokens.Case1.
            Dim g As New G1(Of Tg2)()
            g.GM1(Of Tgm2)(param1, param2)

            ' Case 2: A non-generic method call that depends on its generic 
            ' context, because it uses the type parameter of the enclosing
            ' generic type G2. The token for the MemberRef is Tokens.Case2.
            g.M1(param1)

            ' Case 3: A generic method call that does not depend on its generic 
            ' context, because it does not use type parameters of the enclosing
            ' generic type or method. The token for the MethodSpec is Tokens.Case3.
            Dim gi As New G1(Of Integer)()
            gi.GM1(Of Object)(42, New Object())

            ' Case 4: A non-generic method call that does not depend on its 
            ' generic context, because it does not use the type parameters of the
            ' enclosing generic type or method. The token for the MethodDef is 
            ' Tokens.Case4.
            Dim e As New Example()
            e.M()
        End Sub 
    End Class

    Class Example
        Public Sub M() 
            Dim g As New G1(Of Integer)()
            ' Case 5: A generic method call that does not have any generic 
            ' context. The token for the MethodSpec is Tokens.Case5.
            g.GM1(Of Object)(42, New Object())
        End Sub 
    
        Shared Sub Main() 
            Dim m As [Module] = GetType(Example).Assembly.ManifestModule
            Dim miResolved2 As MethodInfo = Nothing
        
            ' Case 1: A generic method call that is dependent on its generic context.
            '
            ' Create and display a MethodInfo representing the MethodSpec of the 
            ' generic method g.GM1(Of Tgm2)() that is called in G2(Of Tg2).GM2(Of Tgm2)().
            Dim t As Type = GetType(G1(Of )).MakeGenericType(GetType(G2(Of )).GetGenericArguments())
            Dim mi As MethodInfo = GetType(G2(Of )).GetMethod("GM2")
            Dim miTest As MethodInfo = t.GetMethod("GM1").MakeGenericMethod(mi.GetGenericArguments())
            Console.WriteLine(vbCrLf & "Case 1:" & vbCrLf & miTest.ToString())
        
            ' Resolve the MethodSpec token for method G1(Of Tg2).GM1(Of Tgm2)(), which 
            ' is called in method G2(Of Tg2).GM2(Of Tgm2)(). The GetGenericArguments 
            ' method must be used to obtain the context for resolving the method.
            Dim miResolved As MethodInfo = CType(m.ResolveMethod( _
                    CInt(Tokens.Case1), _
                    GetType(G2(Of )).GetGenericArguments(), _
                    GetType(G2(Of )).GetMethod("GM2").GetGenericArguments()), _
                MethodInfo)
            Console.WriteLine(miResolved)
            Console.WriteLine("Is the resolved method the same? {0}", miResolved Is miTest)
        
            ' The overload that doesn't specify generic context throws an exception
            ' because there is insufficient context to resolve the token.
            Try
                miResolved2 = CType(m.ResolveMethod(CInt(Tokens.Case1)), MethodInfo)
            Catch ex As Exception
                Console.WriteLine("{0}: {1}", ex.GetType(), ex.Message)
            End Try
        
        
            ' Case 2: A non-generic method call that is dependent on its generic context.
            '
            ' Create and display a MethodInfo representing the MemberRef of the 
            ' non-generic method g.M1() that is called in G2(Of Tg2).GM2(Of Tgm2)().
            t = GetType(G1(Of )).MakeGenericType(GetType(G2(Of )).GetGenericArguments())
            miTest = t.GetMethod("M1")
            Console.WriteLine(vbCrLf & "Case 2:" & vbCrLf & miTest.ToString())
        
            ' Resolve the MemberRef token for method G1(Of Tg2).M1(), which is
            ' called in method G2(Of Tg2).GM2(Of Tgm2)(). The GetGenericArguments 
            ' method must be used to obtain the context for resolving the method, 
            ' because the method parameter comes from the generic type G1, and the 
            ' because argument, Tg2, comes from the generic type that encloses the 
            ' call. There is no enclosing generic method, so Type.EmptyTypes could
            ' be passed for the genericMethodArguments parameter.
            miResolved = CType(m.ResolveMethod( _
                    CInt(Tokens.Case2), _
                    GetType(G2(Of )).GetGenericArguments(), _
                    GetType(G2(Of )).GetMethod("GM2").GetGenericArguments()), _
                MethodInfo)
            Console.WriteLine(miResolved)
            Console.WriteLine("Is the resolved method the same? {0}", miResolved Is miTest)
        
            ' The overload that doesn't specify generic context throws an exception
            ' because there is insufficient context to resolve the token.
            Try
                miResolved2 = CType(m.ResolveMethod(CInt(Tokens.Case2)), MethodInfo)
            Catch ex As Exception
                Console.WriteLine("{0}: {1}", ex.GetType(), ex.Message)
            End Try
        
        
            ' Case 3: A generic method call that is independent of its generic context.
            '
            ' Create and display a MethodInfo representing the MethodSpec of the 
            ' generic method gi.GM1(Of Object)() that is called in G2(Of Tg2).GM2(Of Tgm2)().
            mi = GetType(G1(Of Integer)).GetMethod("GM1")
            miTest = mi.MakeGenericMethod(New Type() {GetType(Object)})
            Console.WriteLine(vbCrLf & "Case 3:" & vbCrLf & miTest.ToString())
        
            ' Resolve the token for method G1(Of Integer).GM1(Of Object)(), which is 
            ' calledin G2(Of Tg2).GM2(Of Tgm2)(). The GetGenericArguments method is  
            ' used to obtain the context for resolving the method, but the method call
            ' in this case does not use type parameters of the enclosing type or
            ' method, so Type.EmptyTypes could be used for both arguments.
            miResolved = CType(m.ResolveMethod( _
                    CInt(Tokens.Case3), _
                    GetType(G2(Of )).GetGenericArguments(), _
                    GetType(G2(Of )).GetMethod("GM2").GetGenericArguments()), _
                MethodInfo)
            Console.WriteLine(miResolved)
            Console.WriteLine("Is the resolved method the same? {0}", miResolved Is miTest)
        
            ' The method call in this case does not depend on the enclosing generic
            ' context, so the token can also be resolved by the simpler overload.
            miResolved2 = CType(m.ResolveMethod(CInt(Tokens.Case3)), MethodInfo)
        
        
            ' Case 4: A non-generic method call that is independent of its generic context.
            '
            ' Create and display a MethodInfo representing the MethodDef of the 
            ' method e.M() that is called in G2(Of Tg2).GM2(Of Tgm2)().
            miTest = GetType(Example).GetMethod("M")
            Console.WriteLine(vbCrLf & "Case 4:" & vbCrLf & miTest.ToString())
        
            ' Resolve the token for method Example.M(), which is called in
            ' G2(Of Tg2).GM2(Of Tgm2)(). The GetGenericArguments method is used to 
            ' obtain the context for resolving the method, but the non-generic 
            ' method call does not use type parameters of the enclosing type or
            ' method, so Type.EmptyTypes could be used for both arguments.
            miResolved = CType(m.ResolveMethod( _
                    CInt(Tokens.Case4), _
                    GetType(G2(Of )).GetGenericArguments(), _
                    GetType(G2(Of )).GetMethod("GM2").GetGenericArguments()), _
                MethodInfo)
            Console.WriteLine(miResolved)
            Console.WriteLine("Is the resolved method the same? {0}", miResolved Is miTest)
        
            ' The method call in this case does not depend on any enclosing generic
            ' context, so the token can also be resolved by the simpler overload.
            miResolved2 = CType(m.ResolveMethod(CInt(Tokens.Case4)), MethodInfo)
        
        
            ' Case 5: Generic method call in a non-generic context.
            '
            ' Create and display a MethodInfo representing the MethodRef of the 
            ' closed generic method g.GM1(Of Object)() that is called in Example.M().
            mi = GetType(G1(Of Integer)).GetMethod("GM1")
            miTest = mi.MakeGenericMethod(New Type() {GetType(Object)})
            Console.WriteLine(vbCrLf & "Case 5:" & vbCrLf & miTest.ToString())
        
            ' Resolve the token for method G1(Of Integer).GM1(Of Object)(), which is 
            ' called in method Example.M(). The GetGenericArguments method is used to 
            ' obtain the context for resolving the method, but the enclosing type
            ' and method are not generic, so Type.EmptyTypes could be used for
            ' both arguments.
            miResolved = CType(m.ResolveMethod( _
                    CInt(Tokens.Case5), _
                    GetType(Example).GetGenericArguments(), _
                    GetType(Example).GetMethod("M").GetGenericArguments()), _
                MethodInfo)
            Console.WriteLine(miResolved)
            Console.WriteLine("Is the resolved method the same? {0}", miResolved Is miTest)
        
            ' The method call in this case does not depend on any enclosing generic
            ' context, so the token can also be resolved by the simpler overload.
            miResolved2 = CType(m.ResolveMethod(CInt(Tokens.Case5)), MethodInfo)
    
        End Sub 
    End Class 
End Namespace

' This example produces the following output:
'
'Case 1:
'Void GM1[Tgm2](Tg2, Tgm2)
'Void GM1[Tgm2](Tg2, Tgm2)
'Is the resolved method the same? True
'System.ArgumentException: A BadImageFormatException has been thrown while parsing the signature. This is likely due to lack of a generic context. Ensure genericTypeArguments and genericMethodArguments are provided and contain enough context.
'
'Case 2:
'Void M1(Tg2)
'Void M1(Tg2)
'Is the resolved method the same? True
'System.ArgumentException: A BadImageFormatException has been thrown while parsing the signature. This is likely due to lack of a generic context. Ensure genericTypeArguments and genericMethodArguments are provided and contain enough context.
'
'Case 3:
'Void GM1[Object](Int32, System.Object)
'Void GM1[Object](Int32, System.Object)
'Is the resolved method the same? True
'
'Case 4:
'Void M()
'Void M()
'Is the resolved method the same? True
'
'Case 5:
'Void GM1[Object](Int32, System.Object)
'Void GM1[Object](Int32, System.Object)
'Is the resolved method the same? True
'

Comentários

Para resolve um token de metadados para um MethodSpec cuja assinatura contém o tipo ELEMENT_TYPE_VAR de elemento ou ELEMENT_TYPE_MVAR, use a sobrecarga do ResolveMethod(Int32, Type[], Type[]) método, que permite fornecer o contexto necessário. Ou seja, quando você está resolvendo um token de metadados para um método que depende dos parâmetros de tipo genérico do tipo genérico e/ou do método genérico no qual o token está inserido, você deve usar a sobrecarga que permite fornecer esses parâmetros de tipo.

Observação

Informações sobre tokens de metadados podem ser encontradas na documentação da CLI (Common Language Infrastructure), especialmente "Partição II: Definição de Metadados e Semântica". Para obter mais informações, consulte CLI (Common Language Infrastructure) do ECMA 335.

Aplica-se a