Attribute.GetCustomAttribute Attribute.GetCustomAttribute Attribute.GetCustomAttribute Attribute.GetCustomAttribute Method

定義

アセンブリ、モジュール、型のメンバー、またはメソッド パラメーターに適用された指定した型のカスタム属性を取得します。Retrieves a custom attribute of a specified type applied to an assembly, module, type member, or method parameter.

オーバーロード

GetCustomAttribute(ParameterInfo, Type, Boolean) GetCustomAttribute(ParameterInfo, Type, Boolean) GetCustomAttribute(ParameterInfo, Type, Boolean) GetCustomAttribute(ParameterInfo, Type, Boolean)

メソッド パラメーターに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to a method parameter. 各パラメーターは、対象のメソッド パラメーター、検索対象のカスタム属性の型、およびそのメソッド パラメーターの先祖を検索するかどうかを指定します。Parameters specify the method parameter, the type of the custom attribute to search for, and whether to search ancestors of the method parameter.

GetCustomAttribute(MemberInfo, Type, Boolean) GetCustomAttribute(MemberInfo, Type, Boolean) GetCustomAttribute(MemberInfo, Type, Boolean) GetCustomAttribute(MemberInfo, Type, Boolean)

型のメンバーに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to a member of a type. 各パラメーターは、対象のメンバー、検索対象のカスタム属性の型、およびそのメンバーの先祖を検索するかどうかを指定します。Parameters specify the member, the type of the custom attribute to search for, and whether to search ancestors of the member.

GetCustomAttribute(Assembly, Type, Boolean) GetCustomAttribute(Assembly, Type, Boolean) GetCustomAttribute(Assembly, Type, Boolean) GetCustomAttribute(Assembly, Type, Boolean)

アセンブリに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to an assembly. 各パラメーターは、対象のアセンブリ、検索対象のカスタム属性の型、および無視する検索オプションを指定します。Parameters specify the assembly, the type of the custom attribute to search for, and an ignored search option.

GetCustomAttribute(Module, Type, Boolean) GetCustomAttribute(Module, Type, Boolean) GetCustomAttribute(Module, Type, Boolean) GetCustomAttribute(Module, Type, Boolean)

モジュールに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to a module. 各パラメーターは、対象のモジュール、検索対象のカスタム属性の型、および無視する検索オプションを指定します。Parameters specify the module, the type of the custom attribute to search for, and an ignored search option.

GetCustomAttribute(Module, Type) GetCustomAttribute(Module, Type) GetCustomAttribute(Module, Type) GetCustomAttribute(Module, Type)

モジュールに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to a module. 各パラメーターは、対象のモジュールと検索対象のカスタム属性の型を指定します。Parameters specify the module, and the type of the custom attribute to search for.

GetCustomAttribute(MemberInfo, Type) GetCustomAttribute(MemberInfo, Type) GetCustomAttribute(MemberInfo, Type) GetCustomAttribute(MemberInfo, Type)

型のメンバーに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to a member of a type. 各パラメーターは、対象のメンバーと検索対象のカスタム属性の型を指定します。Parameters specify the member, and the type of the custom attribute to search for.

GetCustomAttribute(Assembly, Type) GetCustomAttribute(Assembly, Type) GetCustomAttribute(Assembly, Type) GetCustomAttribute(Assembly, Type)

指定したアセンブリに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to a specified assembly. 各パラメーターは、対象のアセンブリと検索対象のカスタム属性の型を指定します。Parameters specify the assembly and the type of the custom attribute to search for.

GetCustomAttribute(ParameterInfo, Type) GetCustomAttribute(ParameterInfo, Type) GetCustomAttribute(ParameterInfo, Type) GetCustomAttribute(ParameterInfo, Type)

メソッド パラメーターに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to a method parameter. 各パラメーターは、対象のメソッド パラメーターと検索対象のカスタム属性の型を指定します。Parameters specify the method parameter, and the type of the custom attribute to search for.

GetCustomAttribute(ParameterInfo, Type, Boolean) GetCustomAttribute(ParameterInfo, Type, Boolean) GetCustomAttribute(ParameterInfo, Type, Boolean) GetCustomAttribute(ParameterInfo, Type, Boolean)

メソッド パラメーターに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to a method parameter. 各パラメーターは、対象のメソッド パラメーター、検索対象のカスタム属性の型、およびそのメソッド パラメーターの先祖を検索するかどうかを指定します。Parameters specify the method parameter, the type of the custom attribute to search for, and whether to search ancestors of the method parameter.

public:
 static Attribute ^ GetCustomAttribute(System::Reflection::ParameterInfo ^ element, Type ^ attributeType, bool inherit);
public static Attribute GetCustomAttribute (System.Reflection.ParameterInfo element, Type attributeType, bool inherit);
static member GetCustomAttribute : System.Reflection.ParameterInfo * Type * bool -> Attribute
Public Shared Function GetCustomAttribute (element As ParameterInfo, attributeType As Type, inherit As Boolean) As Attribute

パラメーター

element
ParameterInfo ParameterInfo ParameterInfo ParameterInfo

クラスのメンバーのパラメーターを記述する ParameterInfo クラスから派生したオブジェクト。An object derived from the ParameterInfo class that describes a parameter of a member of a class.

attributeType
Type Type Type Type

検索対象とするカスタム属性の型または基本型。The type, or a base type, of the custom attribute to search for.

inherit
Boolean Boolean Boolean Boolean

true の場合は、element の先祖のカスタム属性も検索することを示します。If true, specifies to also search the ancestors of element for custom attributes.

戻り値

attributeType に適用される element 型の単一のカスタム属性への参照。該当する属性がない場合は nullA reference to the single custom attribute of type attributeType that is applied to element, or null if there is no such attribute.

例外

element または attributeTypenull です。element or attributeType is null.

attributeTypeAttribute から派生していません。attributeType is not derived from Attribute.

要求された属性が複数見つかりました。More than one of the requested attributes was found.

カスタム属性の型を読み込むことはできません。A custom attribute type cannot be loaded.

次のコード例は、カスタム パラメーターを定義します。Attributeクラスと派生クラスと派生クラスの基本のメソッドにカスタム属性を適用します。The following code example defines a custom parameter Attribute class and applies the custom attribute to a method in a derived class and the base of the derived class. 使用例を示します、GetCustomAttribute属性を返します。The example shows the use of the GetCustomAttribute method to return the attributes.

// Example for the Attribute::GetCustomAttribute( ParameterInfo*, Type*, bool ) 
// method.
using namespace System;
using namespace System::Collections;
using namespace System::Reflection;

namespace NDP_UE_CPP
{
   // Define a custom parameter attribute that takes a single message argument.

   [AttributeUsage(AttributeTargets::Parameter)]
   public ref class ArgumentUsageAttribute: public Attribute
   {
   protected:

      // usageMsg is storage for the attribute message.
      String^ usageMsg;

   public:

      // This is the attribute constructor.
      ArgumentUsageAttribute( String^ UsageMsg )
      {
         this->usageMsg = UsageMsg;
      }

      property String^ Message 
      {
         // This is the Message property for the attribute.
         String^ get()
         {
            return usageMsg;
         }

         void set( String^ value )
         {
            this->usageMsg = value;
         }
      }
   };

   public ref class BaseClass
   {
   public:

      // Assign an ArgumentUsage attribute to the strArray parameter.
      // Assign a ParamArray attribute to strList.
      virtual void TestMethod( [ArgumentUsage("Must pass an array here.")]array<String^>^strArray,
                               ...array<String^>^strList ){}
   };

   public ref class DerivedClass: public BaseClass
   {
   public:

      // Assign an ArgumentUsage attributes to the strList parameter.
      virtual void TestMethod( array<String^>^strArray, [ArgumentUsage(
      "Can pass a parameter list or array here.")]array<String^>^strList ) override {}

   };

   void DisplayParameterAttributes( MethodInfo^ mInfo, array<ParameterInfo^>^pInfoArray, bool includeInherited )
   {
      Console::WriteLine( "\nParameter attribute information for method \"{0}"
      "\"\nincludes inheritance from base class: {1}.", mInfo->Name, includeInherited ? (String^)"Yes" : "No" );
      
      // This implements foreach( ParameterInfo* paramInfo in pInfoArray ).
      IEnumerator^ myEnum = pInfoArray->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         ParameterInfo^ paramInfo = safe_cast<ParameterInfo^>(myEnum->Current);

         // See if the ParamArray attribute is defined.
         bool isDef = Attribute::IsDefined( paramInfo, ParamArrayAttribute::typeid );
         if ( isDef )
                  Console::WriteLine( "\n    The ParamArray attribute is defined "
         "for \n    parameter {0} of method {1}.", paramInfo->Name, mInfo->Name );

         // See if ParamUsageAttribute is defined.  
         // If so, display a message.
         ArgumentUsageAttribute^ usageAttr = static_cast<ArgumentUsageAttribute^>(Attribute::GetCustomAttribute( paramInfo, ArgumentUsageAttribute::typeid, includeInherited ));
         if ( usageAttr != nullptr )
         {
            Console::WriteLine( "\n    The ArgumentUsage attribute is defined "
            "for \n    parameter {0} of method {1}.", paramInfo->Name, mInfo->Name );
            Console::WriteLine( "\n        The usage "
            "message for {0} is:\n        \"{1}\".", paramInfo->Name, usageAttr->Message );
         }
      }
   }

}

int main()
{
   Console::WriteLine( "This example of Attribute::GetCustomAttribute( ParameterInfo*, "
   "Type*, bool )\ngenerates the following output." );

   // Get the class type, and then get the MethodInfo object 
   // for TestMethod to access its metadata.
   Type^ clsType = NDP_UE_CPP::DerivedClass::typeid;
   MethodInfo^ mInfo = clsType->GetMethod(  "TestMethod" );

   // Iterate through the ParameterInfo array for the method parameters.
   array<ParameterInfo^>^pInfoArray = mInfo->GetParameters();
   if ( pInfoArray != nullptr )
   {
      NDP_UE_CPP::DisplayParameterAttributes( mInfo, pInfoArray, false );
      NDP_UE_CPP::DisplayParameterAttributes( mInfo, pInfoArray, true );
   }
   else
      Console::WriteLine( "The parameters information could "
   "not be retrieved for method {0}.", mInfo->Name );
}

/*
This example of Attribute::GetCustomAttribute( ParameterInfo*, Type*, bool )
generates the following output.

Parameter attribute information for method "TestMethod"
includes inheritance from base class: No.

    The ParamArray attribute is defined for
    parameter strList of method TestMethod.

    The ArgumentUsage attribute is defined for
    parameter strList of method TestMethod.

        The usage message for strList is:
        "Can pass a parameter list or array here.".

Parameter attribute information for method "TestMethod"
includes inheritance from base class: Yes.

    The ArgumentUsage attribute is defined for
    parameter strArray of method TestMethod.

        The usage message for strArray is:
        "Must pass an array here.".

    The ParamArray attribute is defined for
    parameter strList of method TestMethod.

    The ArgumentUsage attribute is defined for
    parameter strList of method TestMethod.

        The usage message for strList is:
        "Can pass a parameter list or array here.".
*/
// Example for the Attribute.GetCustomAttribute( ParameterInfo, Type, Boolean ) 
// method.
using System;
using System.Reflection;

namespace NDP_UE_CS 
{
    // Define a custom parameter attribute that takes a single message argument.
    [AttributeUsage( AttributeTargets.Parameter )]
    public class ArgumentUsageAttribute : Attribute
    {
        // This is the attribute constructor.
        public ArgumentUsageAttribute( string UsageMsg )
        {
            this.usageMsg = UsageMsg;
        }

        // usageMsg is storage for the attribute message.
        protected string usageMsg;

        // This is the Message property for the attribute.
        public string Message
        {
            get { return usageMsg; }
            set { usageMsg = value; }
        }
    }

    public class BaseClass 
    {
        // Assign an ArgumentUsage attribute to the strArray parameter.
        // Assign a ParamArray attribute to strList using the params keyword.
        public virtual void TestMethod(
            [ArgumentUsage("Must pass an array here.")]
            String[] strArray,
            params String[] strList)
        { }
    }

    public class DerivedClass : BaseClass
    {
        // Assign an ArgumentUsage attribute to the strList parameter.
        // Assign a ParamArray attribute to strList using the params keyword.
        public override void TestMethod(
            String[] strArray,
            [ArgumentUsage("Can pass a parameter list or array here.")]
            params String[] strList)
        { }
    }

    class CustomParamDemo 
    {
        static void Main( ) 
        {
            Console.WriteLine( 
                "This example of Attribute.GetCustomAttribute( Parameter" +
                "Info, Type, Boolean )\ngenerates the following output." );

            // Get the class type, and then get the MethodInfo object 
            // for TestMethod to access its metadata.
            Type clsType = typeof(DerivedClass);
            MethodInfo mInfo = clsType.GetMethod("TestMethod");

            // Iterate through the ParameterInfo array for the method parameters.
            ParameterInfo[] pInfoArray = mInfo.GetParameters();
            if (pInfoArray != null) 
            {
                DisplayParameterAttributes( mInfo, pInfoArray, false );
                DisplayParameterAttributes( mInfo, pInfoArray, true );
            }
            else
                Console.WriteLine("The parameters information could " +
                    "not be retrieved for method {0}.", mInfo.Name);
        }

        static void DisplayParameterAttributes( MethodInfo mInfo,
            ParameterInfo[] pInfoArray, bool includeInherited )
        {
            Console.WriteLine( 
                "\nParameter attribute information for method \"" +
                "{0}\"\nincludes inheritance from base class: {1}.", 
                mInfo.Name, includeInherited ? "Yes" : "No" );

            // Display the attribute information for the parameters.
            foreach( ParameterInfo paramInfo in pInfoArray )
            {
                // See if the ParamArray attribute is defined.
                bool isDef = Attribute.IsDefined( paramInfo, 
                    typeof(ParamArrayAttribute));

                if( isDef )
                    Console.WriteLine(
                        "\n    The ParamArray attribute is defined " +
                        "for \n    parameter {0} of method {1}.",
                        paramInfo.Name, mInfo.Name);

                // See if ParamUsageAttribute is defined.  
                // If so, display a message.
                ArgumentUsageAttribute usageAttr = (ArgumentUsageAttribute)
                    Attribute.GetCustomAttribute( paramInfo, 
                        typeof(ArgumentUsageAttribute),
                        includeInherited );

                if( usageAttr != null )
                {
                    Console.WriteLine( 
                        "\n    The ArgumentUsage attribute is def" +
                        "ined for \n    parameter {0} of method {1}.",
                        paramInfo.Name, mInfo.Name );

                    Console.WriteLine( "\n        The usage " +
                        "message for {0} is:\n        \"{1}\".",
                        paramInfo.Name, usageAttr.Message);
                }
            }
        }
    }
}

/*
This example of Attribute.GetCustomAttribute( ParameterInfo, Type, Boolean )
generates the following output.

Parameter attribute information for method "TestMethod"
includes inheritance from base class: No.

    The ParamArray attribute is defined for
    parameter strList of method TestMethod.

    The ArgumentUsage attribute is defined for
    parameter strList of method TestMethod.

        The usage message for strList is:
        "Can pass a parameter list or array here.".

Parameter attribute information for method "TestMethod"
includes inheritance from base class: Yes.

    The ArgumentUsage attribute is defined for
    parameter strArray of method TestMethod.

        The usage message for strArray is:
        "Must pass an array here.".

    The ParamArray attribute is defined for
    parameter strList of method TestMethod.

    The ArgumentUsage attribute is defined for
    parameter strList of method TestMethod.

        The usage message for strList is:
        "Can pass a parameter list or array here.".
*/
' Example for the Attribute.GetCustomAttribute( ParameterInfo, Type, Boolean ) 
' method.
Imports System
Imports System.Reflection
Imports Microsoft.VisualBasic

Namespace NDP_UE_VB

    ' Define a custom parameter attribute that takes a single message argument.
    <AttributeUsage(AttributeTargets.Parameter)>  _
    Public Class ArgumentUsageAttribute
        Inherits Attribute
           
        ' This is the attribute constructor.
        Public Sub New(UsageMsg As String)
            Me.usageMsg = UsageMsg
        End Sub ' New

        ' usageMsg is storage for the attribute message.
        Protected usageMsg As String
           
        ' This is the Message property for the attribute.
        Public Property Message() As String
            Get
                Return usageMsg
            End Get
            Set
                usageMsg = value
            End Set
        End Property
    End Class ' ArgumentUsageAttribute 

    Public Class BaseClass
       
        ' Assign an ArgumentUsage attribute to the strArray parameter.
        ' Assign a ParamArray attribute to the strList parameter.
        Public Overridable Sub TestMethod( _
            <ArgumentUsage("Must pass an array here.")> _
            strArray() As String, _
            ParamArray strList() As String)
        End Sub ' TestMethod
    End Class ' BaseClass

    Public Class DerivedClass
        Inherits BaseClass
           
        ' Assign an ArgumentUsage attribute to the strList parameter.
        ' Assign a ParamArray attribute to the strList parameter.
        Public Overrides Sub TestMethod( _
            strArray() As String, _
            <ArgumentUsage("Can pass a parameter list or array here.")> _
            ParamArray strList() As String)
        End Sub ' TestMethod
    End Class ' DerivedClass

    Class DemoClass
           
        Shared Sub DisplayParameterAttributes(mInfo As MethodInfo, _
            pInfoArray() As ParameterInfo, includeInherited As Boolean)

            Console.WriteLine( vbCrLf & _
                "Parameter attribute information for method ""{0}""" & _
                vbCrLf & "includes inheritance from the base class: {1}.", _
                mInfo.Name, IIf(includeInherited, "Yes", "No"))
              
            ' Display attribute information for the parameters.
            Dim paramInfo As ParameterInfo
            For Each paramInfo In  pInfoArray

                ' See if the ParamArray attribute is defined.
                Dim isDef As Boolean = _
                    Attribute.IsDefined(paramInfo, GetType(ParamArrayAttribute))

                If isDef Then
                    Console.WriteLine( vbCrLf & "    The " & _
                        "ParamArray attribute is defined for " & _
                        vbCrLf & "    parameter {0} of method {1}.", _
                        paramInfo.Name, mInfo.Name)
                End If
                 
                ' See if ParamUsageAttribute is defined.  
                ' If so, display a message.
                Dim usageAttr As ArgumentUsageAttribute = _
                    Attribute.GetCustomAttribute(paramInfo, _
                        GetType(ArgumentUsageAttribute), _
                        includeInherited)

                If Not (usageAttr Is Nothing) Then
                    Console.WriteLine( vbCrLf & "    The " & _
                        "ArgumentUsage attribute is defined for " & _
                        vbCrLf & "    parameter {0} of method {1}.", _
                        paramInfo.Name, mInfo.Name)
                    Console.WriteLine( vbCrLf & _
                        "        The usage message for {0} is: " & _
                        vbCrLf & "        ""{1}"".", _
                        paramInfo.Name, usageAttr.Message)
                End If
            Next paramInfo
        End Sub ' DisplayParameterAttributes
       
        Public Shared Sub Main()
            Console.WriteLine( _
                "This example of Attribute.GetCustomAttribute" & _
                "( ParameterInfo, Type, Boolean )" & vbCrLf & _
                "generates the following output." )
              
            ' Get the class type, and then get the MethodInfo object 
            ' for TestMethod to access its metadata.
            Dim clsType As Type = GetType(DerivedClass)
            Dim mInfo As MethodInfo = clsType.GetMethod("TestMethod")
              
            ' Iterate through the ParameterInfo array for the method parameters.
            Dim pInfoArray As ParameterInfo() = mInfo.GetParameters()
            If Not (pInfoArray Is Nothing) Then

                DisplayParameterAttributes(mInfo, pInfoArray, False)
                DisplayParameterAttributes(mInfo, pInfoArray, True)
            Else
                Console.WriteLine( _
                    "The parameters information could " & _
                    "not be retrieved for method {0}.", mInfo.Name)
            End If
        End Sub ' Main

    End Class ' DemoClass
End Namespace ' NDP_UE_VB

' This example of Attribute.GetCustomAttribute( ParameterInfo, Type, Boolean )
' generates the following output.
' 
' Parameter attribute information for method "TestMethod"
' includes inheritance from the base class: No.
' 
'     The ParamArray attribute is defined for
'     parameter strList of method TestMethod.
' 
'     The ArgumentUsage attribute is defined for
'     parameter strList of method TestMethod.
' 
'         The usage message for strList is:
'         "Can pass a parameter list or array here.".
' 
' Parameter attribute information for method "TestMethod"
' includes inheritance from the base class: Yes.
' 
'     The ArgumentUsage attribute is defined for
'     parameter strArray of method TestMethod.
' 
'         The usage message for strArray is:
'         "Must pass an array here.".
' 
'     The ParamArray attribute is defined for
'     parameter strList of method TestMethod.
' 
'     The ArgumentUsage attribute is defined for
'     parameter strList of method TestMethod.
' 
'         The usage message for strList is:
'         "Can pass a parameter list or array here.".

注釈

場合element派生型のメソッド内のパラメーターを表す、戻り値には、同じパラメーターでオーバーライドされる基本メソッドに適用される継承可能なカスタム属性が含まれています。If element represents a parameter in a method of a derived type, the return value includes the inheritable custom attributes applied to the same parameter in the overridden base methods.

GetCustomAttribute(MemberInfo, Type, Boolean) GetCustomAttribute(MemberInfo, Type, Boolean) GetCustomAttribute(MemberInfo, Type, Boolean) GetCustomAttribute(MemberInfo, Type, Boolean)

型のメンバーに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to a member of a type. 各パラメーターは、対象のメンバー、検索対象のカスタム属性の型、およびそのメンバーの先祖を検索するかどうかを指定します。Parameters specify the member, the type of the custom attribute to search for, and whether to search ancestors of the member.

public:
 static Attribute ^ GetCustomAttribute(System::Reflection::MemberInfo ^ element, Type ^ attributeType, bool inherit);
public static Attribute GetCustomAttribute (System.Reflection.MemberInfo element, Type attributeType, bool inherit);
static member GetCustomAttribute : System.Reflection.MemberInfo * Type * bool -> Attribute
Public Shared Function GetCustomAttribute (element As MemberInfo, attributeType As Type, inherit As Boolean) As Attribute

パラメーター

element
MemberInfo MemberInfo MemberInfo MemberInfo

クラスのコンストラクター メンバー、イベント メンバー、フィールド メンバー、メソッド メンバー、またはプロパティ メンバーを記述する MemberInfo クラスから派生したオブジェクト。An object derived from the MemberInfo class that describes a constructor, event, field, method, or property member of a class.

attributeType
Type Type Type Type

検索対象とするカスタム属性の型または基本型。The type, or a base type, of the custom attribute to search for.

inherit
Boolean Boolean Boolean Boolean

true の場合は、element の先祖のカスタム属性も検索することを示します。If true, specifies to also search the ancestors of element for custom attributes.

戻り値

attributeType に適用される element 型の単一のカスタム属性への参照。該当する属性がない場合は nullA reference to the single custom attribute of type attributeType that is applied to element, or null if there is no such attribute.

例外

element または attributeTypenull です。element or attributeType is null.

attributeTypeAttribute から派生していません。attributeType is not derived from Attribute.

elementがコンストラクター、メソッド、プロパティ、イベント、型、またはフィールドではありません。element is not a constructor, method, property, event, type, or field.

要求された属性が複数見つかりました。More than one of the requested attributes was found.

カスタム属性の型を読み込むことはできません。A custom attribute type cannot be loaded.

次のコード例の使用を示しています、GetCustomAttributeメソッドをMemberInfoをパラメーターとして。The following code example illustrates the use of the GetCustomAttribute method taking a MemberInfo as a parameter.

using namespace System;
using namespace System::Reflection;

namespace IsDef4CS
{
   public ref class TestClass
   {
   public:

      // Assign the Obsolete attribute to a method.

      [Obsolete("This method is obsolete. Use Method2 instead.")]
      void Method1(){}

      void Method2(){}

   };

   ref class DemoClass
   {
   public:
      static void Main()
      {
         
         // Get the class type to access its metadata.
         Type^ clsType = TestClass::typeid;
         
         // Get the MethodInfo object for Method1.
         MethodInfo^ mInfo = clsType->GetMethod( "Method1" );
         
         // See if the Obsolete attribute is defined for this method.
         bool isDef = Attribute::IsDefined( mInfo, ObsoleteAttribute::typeid );
         
         // Display the result.
         Console::WriteLine( "The Obsolete Attribute {0} defined for {1} of class {2}.", isDef ? (String^)"is" : "is not", mInfo->Name, clsType->Name );
         
         // If it's defined, display the attribute's message.
         if ( isDef )
         {
            ObsoleteAttribute^ obsAttr = dynamic_cast<ObsoleteAttribute^>(Attribute::GetCustomAttribute( mInfo, ObsoleteAttribute::typeid ));
            if ( obsAttr != nullptr )
                        Console::WriteLine( "The message is: \"{0}\".", obsAttr->Message );
            else
                        Console::WriteLine( "The message could not be retrieved." );
         }
      }

   };

}


/*
 * Output:
 * The Obsolete Attribute is defined for Method1 of class TestClass.
 * The message is: "This method is obsolete. Use Method2 instead.".
 */
using System;
using System.Reflection;

namespace IsDef4CS 
{
    public class TestClass 
    {
        // Assign the Obsolete attribute to a method.
        [Obsolete("This method is obsolete. Use Method2 instead.")]
        public void Method1()
        {}
        public void Method2()
        {}
    }

    public class DemoClass 
    {
        static void Main(string[] args) 
        {
            // Get the class type to access its metadata.
            Type clsType = typeof(TestClass);
            // Get the MethodInfo object for Method1.
            MethodInfo mInfo = clsType.GetMethod("Method1");
            // See if the Obsolete attribute is defined for this method.
            bool isDef = Attribute.IsDefined(mInfo, typeof(ObsoleteAttribute));
            // Display the result.
            Console.WriteLine("The Obsolete Attribute {0} defined for {1} of class {2}.",
                isDef ? "is" : "is not", mInfo.Name, clsType.Name);
            // If it's defined, display the attribute's message.
            if (isDef) 
            {
                ObsoleteAttribute obsAttr = 
                                 (ObsoleteAttribute)Attribute.GetCustomAttribute( 
                                                    mInfo, typeof(ObsoleteAttribute));
                if (obsAttr != null)
                    Console.WriteLine("The message is: \"{0}\".",
                        obsAttr.Message);
                else
                    Console.WriteLine("The message could not be retrieved.");
            }
        }
    }
}

/*
 * Output:
 * The Obsolete Attribute is defined for Method1 of class TestClass.
 * The message is: "This method is obsolete. Use Method2 instead.".
 */
Imports System
Imports System.Reflection

Module DemoModule

    Public Class TestClass
        ' Assign the Obsolete attribute to a method.
        <Obsolete("This method is obsolete. Use Method2() instead.")> _
        Public Sub Method1()
        End Sub

        Public Sub Method2()
        End Sub
    End Class

    Sub Main()
        ' Get the class type to access its metadata.
        Dim clsType As Type = GetType(TestClass)
        ' Get the MethodInfo object for Method1.
        Dim mInfo As MethodInfo = clsType.GetMethod("Method1")
        ' See if the Obsolete attribute is defined for this method.
        Dim isDef As Boolean = Attribute.IsDefined(mInfo, _
            GetType(ObsoleteAttribute))
        Dim strDef As String
        If isDef = True Then
            strDef = "is"
        Else
            strDef = "is not"
        End If
        ' Display the results.
        Console.WriteLine("The Obsolete attribute {0} defined for " & _
            "method {1} of class {2}.", strDef, mInfo.Name, clsType.Name)
        ' If it's defined, display the attribute's message.
        If isDef = True Then
            Dim attr As Attribute = Attribute.GetCustomAttribute(mInfo, _
                GetType(ObsoleteAttribute))
            If Not attr Is Nothing And TypeOf attr Is ObsoleteAttribute Then
                Dim obsAttr As ObsoleteAttribute = _
                    CType(attr, ObsoleteAttribute)
                Console.WriteLine("The message is: ""{0}""", obsAttr.Message)
            Else
                Console.WriteLine("The message could not be retrieved.")
            End If
        End If
    End Sub
End Module

' Output:
' The Obsolete attribute is defined for method Method1 of class TestClass.
' The message is: "This method is obsolete. Use Method2() instead."

注釈

注意

以降、.NET Framework version 2.0 では、このメソッドを返しますセキュリティ属性を型、メソッド、およびコンス トラクターの属性が、新しいメタデータ形式で格納されている場合。Starting with the .NET Framework version 2.0, this method returns security attributes on types, methods, and constructors if the attributes are stored in the new metadata format. バージョン 2.0 以降でコンパイルされたアセンブリでは、新しい形式を使用します。Assemblies compiled with version 2.0 or later use the new format. 動的アセンブリと .NET Framework の以前のバージョンでコンパイルされたアセンブリは、以前の XML 形式を使用します。Dynamic assemblies and assemblies compiled with earlier versions of the .NET Framework use the old XML format. 参照してください宣言セキュリティ属性を出力します。See Emitting Declarative Security Attributes.

GetCustomAttribute(Assembly, Type, Boolean) GetCustomAttribute(Assembly, Type, Boolean) GetCustomAttribute(Assembly, Type, Boolean) GetCustomAttribute(Assembly, Type, Boolean)

アセンブリに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to an assembly. 各パラメーターは、対象のアセンブリ、検索対象のカスタム属性の型、および無視する検索オプションを指定します。Parameters specify the assembly, the type of the custom attribute to search for, and an ignored search option.

public:
 static Attribute ^ GetCustomAttribute(System::Reflection::Assembly ^ element, Type ^ attributeType, bool inherit);
public static Attribute GetCustomAttribute (System.Reflection.Assembly element, Type attributeType, bool inherit);
static member GetCustomAttribute : System.Reflection.Assembly * Type * bool -> Attribute
Public Shared Function GetCustomAttribute (element As Assembly, attributeType As Type, inherit As Boolean) As Attribute

パラメーター

element
Assembly Assembly Assembly Assembly

モジュールの再利用可能なコレクションを記述する Assembly クラスから派生したオブジェクト。An object derived from the Assembly class that describes a reusable collection of modules.

attributeType
Type Type Type Type

検索対象とするカスタム属性の型または基本型。The type, or a base type, of the custom attribute to search for.

inherit
Boolean Boolean Boolean Boolean

このパラメーターは無視され、このメソッドの動作には影響しません。This parameter is ignored, and does not affect the operation of this method.

戻り値

attributeType に適用される element 型の単一のカスタム属性への参照。該当する属性がない場合は nullA reference to the single custom attribute of type attributeType that is applied to element, or null if there is no such attribute.

例外

element または attributeTypenull です。element or attributeType is null.

attributeTypeAttribute から派生していません。attributeType is not derived from Attribute.

要求された属性が複数見つかりました。More than one of the requested attributes was found.

次のコード例の使用を示しています、GetCustomAttributeメソッドをAssemblyをパラメーターとして。The following code example illustrates the use of the GetCustomAttribute method taking an Assembly as a parameter.

using namespace System;
using namespace System::Reflection;

// Add an AssemblyDescription attribute
[assembly:AssemblyDescription("A sample description")];
namespace IsDef1CS
{
   ref class DemoClass
   {
   public:
      static void Main()
      {
         
         // Get the class type to access its metadata.
         Type^ clsType = DemoClass::typeid;
         
         // Get the assembly object.
         Assembly^ assy = clsType->Assembly;
         
         // Store the assembly's name.
         String^ assyName = assy->GetName()->Name;
         
         //Type assyType = assy.GetType();
         // See if the Assembly Description is defined.
         bool isdef = Attribute::IsDefined( assy, AssemblyDescriptionAttribute::typeid );
         if ( isdef )
         {
            
            // Affirm that the attribute is defined.
            Console::WriteLine( "The AssemblyDescription attribute "
            "is defined for assembly {0}.", assyName );
            
            // Get the description attribute itself.
            AssemblyDescriptionAttribute^ adAttr = dynamic_cast<AssemblyDescriptionAttribute^>(Attribute::GetCustomAttribute( assy, AssemblyDescriptionAttribute::typeid ));
            
            // Display the description.
            if ( adAttr != nullptr )
                        Console::WriteLine( "The description is \"{0}\".", adAttr->Description );
            else
                        Console::WriteLine( "The description could not "
            "be retrieved." );
         }
         else
                  Console::WriteLine( "The AssemblyDescription attribute is not "
         "defined for assembly {0}.", assyName );
      }

   };

}


/*
 * Output:
 * The AssemblyDescription attributeis defined for assembly IsDef1CS.
 * The description is "A sample description".
 */
using System;
using System.Reflection;

// Add an AssemblyDescription attribute
[assembly: AssemblyDescription("A sample description")]
namespace IsDef1CS
{
    public class DemoClass
    {
        static void Main(string[] args)
        {
            // Get the class type to access its metadata.
            Type clsType = typeof(DemoClass);
            // Get the assembly object.
            Assembly assy = clsType.Assembly;
            // Store the assembly's name.
            String assyName = assy.GetName().Name;
            // See if the Assembly Description is defined.
            bool isdef = Attribute.IsDefined(assy, 
                typeof(AssemblyDescriptionAttribute));
            if (isdef)
            {
                // Affirm that the attribute is defined.
                Console.WriteLine("The AssemblyDescription attribute " +
                    "is defined for assembly {0}.", assyName);
                // Get the description attribute itself.
                AssemblyDescriptionAttribute adAttr = 
                    (AssemblyDescriptionAttribute)Attribute.GetCustomAttribute(
                    assy, typeof(AssemblyDescriptionAttribute));
                // Display the description.
                if (adAttr != null)
                    Console.WriteLine("The description is \"{0}\".", 
                        adAttr.Description);
                else
                    Console.WriteLine("The description could not " +
                        "be retrieved.");            
            }
            else
                Console.WriteLine("The AssemblyDescription attribute is not " +
                    "defined for assembly {0}.", assyName);
        }
    }
}

/*
 * Output:
 * The AssemblyDescription attribute is defined for assembly IsDef1CS.
 * The description is "A sample description".
 */
Imports System
Imports System.Reflection
Imports Microsoft.VisualBasic

' Add an AssemblyDescription attribute.
<Assembly: AssemblyDescription("A sample description")> 

Module DemoModule
    Sub Main()
        ' Get the assembly for this module.
        Dim assy As System.Reflection.Assembly = GetType(DemoModule).Assembly
        ' Store the assembly name.
        Dim assyName As String = assy.GetName().Name
        ' See if the AssemblyDescription attribute is defined.
        If Attribute.IsDefined(assy, GetType(AssemblyDescriptionAttribute)) _
            Then
            ' Affirm that the attribute is defined. Assume the filename of
            ' this code example is "IsDef1VB".
            Console.WriteLine("The AssemblyDescription attribute is " & _
                "defined for assembly {0}.", assyName)
            ' Get the description attribute itself.
            Dim attr As Attribute = Attribute.GetCustomAttribute( _
                assy, GetType(AssemblyDescriptionAttribute))
            ' Display the description.
            If Not attr Is Nothing And _
                TypeOf attr Is AssemblyDescriptionAttribute Then
                Dim adAttr As AssemblyDescriptionAttribute = _
                    CType(attr, AssemblyDescriptionAttribute)
                Console.WriteLine("The description is " & _
                    Chr(34) & "{0}" & Chr(34) & ".", adAttr.Description)
            Else
                Console.WriteLine("The description could not be retrieved.")
            End If
        Else
            Console.WriteLine("The AssemblyDescription attribute is not " & _
                              "defined for assembly {0}.", assyName)
        End If
    End Sub
End Module

' Output:
' The AssemblyDescription attribute is defined for assembly IsDef1VB.
' The description is "A sample description".

注釈

注意

以降、.NET Framework version 2.0 としたこれらのこのメソッドは、セキュリティ属性に対して属性が、新しいメタデータ形式で格納されている場合を返します。Starting with the .NET Framework version 2.0, this method returns security attributes if the attributes are stored in the new metadata format. バージョン 2.0 以降でコンパイルされたアセンブリでは、新しい形式を使用します。Assemblies compiled with version 2.0 or later use the new format. 動的アセンブリと .NET Framework の以前のバージョンでコンパイルされたアセンブリは、以前の XML 形式を使用します。Dynamic assemblies and assemblies compiled with earlier versions of the .NET Framework use the old XML format. 参照してください宣言セキュリティ属性を出力します。See Emitting Declarative Security Attributes.

GetCustomAttribute(Module, Type, Boolean) GetCustomAttribute(Module, Type, Boolean) GetCustomAttribute(Module, Type, Boolean) GetCustomAttribute(Module, Type, Boolean)

モジュールに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to a module. 各パラメーターは、対象のモジュール、検索対象のカスタム属性の型、および無視する検索オプションを指定します。Parameters specify the module, the type of the custom attribute to search for, and an ignored search option.

public:
 static Attribute ^ GetCustomAttribute(System::Reflection::Module ^ element, Type ^ attributeType, bool inherit);
public static Attribute GetCustomAttribute (System.Reflection.Module element, Type attributeType, bool inherit);
static member GetCustomAttribute : System.Reflection.Module * Type * bool -> Attribute
Public Shared Function GetCustomAttribute (element As Module, attributeType As Type, inherit As Boolean) As Attribute

パラメーター

element
Module Module Module Module

移植可能な実行可能 (PE) ファイルを記述する Module クラスから派生したオブジェクト。An object derived from the Module class that describes a portable executable file.

attributeType
Type Type Type Type

検索対象とするカスタム属性の型または基本型。The type, or a base type, of the custom attribute to search for.

inherit
Boolean Boolean Boolean Boolean

このパラメーターは無視され、このメソッドの動作には影響しません。This parameter is ignored, and does not affect the operation of this method.

戻り値

attributeType に適用される element 型の単一のカスタム属性への参照。該当する属性がない場合は nullA reference to the single custom attribute of type attributeType that is applied to element, or null if there is no such attribute.

例外

element または attributeTypenull です。element or attributeType is null.

attributeTypeAttribute から派生していません。attributeType is not derived from Attribute.

要求された属性が複数見つかりました。More than one of the requested attributes was found.

次のコード例の使用を示しています、GetCustomAttributeメソッドをModuleをパラメーターとして。The following code example illustrates the use of the GetCustomAttribute method taking a Module as a parameter.

using namespace System;
using namespace System::Diagnostics;

// Add the Debuggable attribute to the module.
[module:Debuggable(true,false)];
namespace IsDef2CS
{
   ref class DemoClass
   {
   public:
      static void Main()
      {
         
         // Get the class type to access its metadata.
         Type^ clsType = DemoClass::typeid;
         
         // See if the Debuggable attribute is defined for this module.
         bool isDef = Attribute::IsDefined( clsType->Module, DebuggableAttribute::typeid );
         
         // Display the result.
         Console::WriteLine( "The Debuggable attribute {0} "
         "defined for Module {1}.", isDef ? (String^)"is" : "is not", clsType->Module->Name );
         
         // If the attribute is defined, display the JIT settings.
         if ( isDef )
         {
            
            // Retrieve the attribute itself.
            DebuggableAttribute^ dbgAttr = dynamic_cast<DebuggableAttribute^>(Attribute::GetCustomAttribute( clsType->Module, DebuggableAttribute::typeid ));
            if ( dbgAttr != nullptr )
            {
               Console::WriteLine( "JITTrackingEnabled is {0}.", dbgAttr->IsJITTrackingEnabled );
               Console::WriteLine( "JITOptimizerDisabled is {0}.", dbgAttr->IsJITOptimizerDisabled );
            }
            else
                        Console::WriteLine( "The Debuggable attribute "
            "could not be retrieved." );
         }
      }

   };

}


/*
 * Output:
 * The Debuggable attribute is defined for Module IsDef2CS.exe.
 * JITTrackingEnabled is True.
 * JITOptimizerDisabled is False.
 */
using System;
using System.Diagnostics;

// Add the Debuggable attribute to the module.
[module:Debuggable(true, false)]
namespace IsDef2CS
{
    public class DemoClass
    {
        static void Main(string[] args)
        {
            // Get the class type to access its metadata.
            Type clsType = typeof(DemoClass);
            // See if the Debuggable attribute is defined for this module.
            bool isDef = Attribute.IsDefined(clsType.Module, 
                typeof(DebuggableAttribute));
            // Display the result.
            Console.WriteLine("The Debuggable attribute {0} " +
                "defined for Module {1}.",
                isDef ? "is" : "is not",
                clsType.Module.Name);
            // If the attribute is defined, display the JIT settings.
            if (isDef)
            {
                // Retrieve the attribute itself.
                DebuggableAttribute dbgAttr = (DebuggableAttribute)
                    Attribute.GetCustomAttribute(clsType.Module, 
                    typeof(DebuggableAttribute));
                if (dbgAttr != null)
                {
                    Console.WriteLine("JITTrackingEnabled is {0}.",
                        dbgAttr.IsJITTrackingEnabled);
                    Console.WriteLine("JITOptimizerDisabled is {0}.",
                        dbgAttr.IsJITOptimizerDisabled);
                }
                else
                    Console.WriteLine("The Debuggable attribute " +
                        "could not be retrieved.");
            }
        }
    }
}

/*
 * Output:
 * The Debuggable attribute is defined for Module IsDef2CS.exe.
 * JITTrackingEnabled is True.
 * JITOptimizerDisabled is False.
 */
Imports System
Imports System.Reflection
Imports System.Diagnostics

' Add the Debuggable attribute to the module.
<Module: Debuggable(True, False)> 

Module DemoModule
    Sub Main()
        ' Get the module type information to access its metadata.
        Dim modType As Type = GetType(DemoModule)
        ' See if the Debuggable attribute is defined.
        Dim isDef As Boolean = Attribute.IsDefined(modType.Module, _
                               GetType(DebuggableAttribute))
        Dim strDef As String
        If isDef = True Then
            strDef = "is"
        Else
            strDef = "is not"
        End If
        ' Display the result
        Console.WriteLine("The debuggable attribute {0} defined for " & _
                          "module {1}.", strDef, modType.Name)
        ' If the attribute is defined, display the JIT settings.
        If isDef = True Then
            ' Retrieve the attribute itself.
            Dim attr As Attribute = _
                Attribute.GetCustomAttribute(modType.Module, _
                GetType(DebuggableAttribute))
            If Not attr Is Nothing And TypeOf attr Is DebuggableAttribute Then
                Dim dbgAttr As DebuggableAttribute = _
                    CType(attr, DebuggableAttribute)
                Console.WriteLine("JITTrackingEnabled is {0}.", _
                    dbgAttr.IsJITTrackingEnabled.ToString())
                Console.WriteLine("JITOptimizerDisabled is {0}.", _
                    dbgAttr.IsJITOptimizerDisabled.ToString())
            Else
                Console.WriteLine("The Debuggable attribute could " & _
                                  "not be retrieved.")
            End If
        End If
    End Sub
End Module

' Output:
' The debuggable attribute is defined for module DemoModule.
' JITTrackingEnabled is True.
' JITOptimizerDisabled is False.

GetCustomAttribute(Module, Type) GetCustomAttribute(Module, Type) GetCustomAttribute(Module, Type) GetCustomAttribute(Module, Type)

モジュールに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to a module. 各パラメーターは、対象のモジュールと検索対象のカスタム属性の型を指定します。Parameters specify the module, and the type of the custom attribute to search for.

public:
 static Attribute ^ GetCustomAttribute(System::Reflection::Module ^ element, Type ^ attributeType);
public static Attribute GetCustomAttribute (System.Reflection.Module element, Type attributeType);
static member GetCustomAttribute : System.Reflection.Module * Type -> Attribute
Public Shared Function GetCustomAttribute (element As Module, attributeType As Type) As Attribute

パラメーター

element
Module Module Module Module

移植可能な実行可能 (PE) ファイルを記述する Module クラスから派生したオブジェクト。An object derived from the Module class that describes a portable executable file.

attributeType
Type Type Type Type

検索対象とするカスタム属性の型または基本型。The type, or a base type, of the custom attribute to search for.

戻り値

attributeType に適用される element 型の単一のカスタム属性への参照。該当する属性がない場合は nullA reference to the single custom attribute of type attributeType that is applied to element, or null if there is no such attribute.

例外

element または attributeTypenull です。element or attributeType is null.

attributeTypeAttribute から派生していません。attributeType is not derived from Attribute.

要求された属性が複数見つかりました。More than one of the requested attributes was found.

次のコード例の使用を示しています、GetCustomAttributeメソッドをModuleをパラメーターとして。The following code example illustrates the use of the GetCustomAttribute method taking a Module as a parameter.

using namespace System;
using namespace System::Diagnostics;

// Add the Debuggable attribute to the module.
[module:Debuggable(true,false)];
namespace IsDef2CS
{
   ref class DemoClass
   {
   public:
      static void Main()
      {
         
         // Get the class type to access its metadata.
         Type^ clsType = DemoClass::typeid;
         
         // See if the Debuggable attribute is defined for this module.
         bool isDef = Attribute::IsDefined( clsType->Module, DebuggableAttribute::typeid );
         
         // Display the result.
         Console::WriteLine( "The Debuggable attribute {0} "
         "defined for Module {1}.", isDef ? (String^)"is" : "is not", clsType->Module->Name );
         
         // If the attribute is defined, display the JIT settings.
         if ( isDef )
         {
            
            // Retrieve the attribute itself.
            DebuggableAttribute^ dbgAttr = dynamic_cast<DebuggableAttribute^>(Attribute::GetCustomAttribute( clsType->Module, DebuggableAttribute::typeid ));
            if ( dbgAttr != nullptr )
            {
               Console::WriteLine( "JITTrackingEnabled is {0}.", dbgAttr->IsJITTrackingEnabled );
               Console::WriteLine( "JITOptimizerDisabled is {0}.", dbgAttr->IsJITOptimizerDisabled );
            }
            else
                        Console::WriteLine( "The Debuggable attribute "
            "could not be retrieved." );
         }
      }

   };

}


/*
 * Output:
 * The Debuggable attribute is defined for Module IsDef2CS.exe.
 * JITTrackingEnabled is True.
 * JITOptimizerDisabled is False.
 */
using System;
using System.Diagnostics;

// Add the Debuggable attribute to the module.
[module:Debuggable(true, false)]
namespace IsDef2CS
{
    public class DemoClass
    {
        static void Main(string[] args)
        {
            // Get the class type to access its metadata.
            Type clsType = typeof(DemoClass);
            // See if the Debuggable attribute is defined for this module.
            bool isDef = Attribute.IsDefined(clsType.Module, 
                typeof(DebuggableAttribute));
            // Display the result.
            Console.WriteLine("The Debuggable attribute {0} " +
                "defined for Module {1}.",
                isDef ? "is" : "is not",
                clsType.Module.Name);
            // If the attribute is defined, display the JIT settings.
            if (isDef)
            {
                // Retrieve the attribute itself.
                DebuggableAttribute dbgAttr = (DebuggableAttribute)
                    Attribute.GetCustomAttribute(clsType.Module, 
                    typeof(DebuggableAttribute));
                if (dbgAttr != null)
                {
                    Console.WriteLine("JITTrackingEnabled is {0}.",
                        dbgAttr.IsJITTrackingEnabled);
                    Console.WriteLine("JITOptimizerDisabled is {0}.",
                        dbgAttr.IsJITOptimizerDisabled);
                }
                else
                    Console.WriteLine("The Debuggable attribute " +
                        "could not be retrieved.");
            }
        }
    }
}

/*
 * Output:
 * The Debuggable attribute is defined for Module IsDef2CS.exe.
 * JITTrackingEnabled is True.
 * JITOptimizerDisabled is False.
 */
Imports System
Imports System.Reflection
Imports System.Diagnostics

' Add the Debuggable attribute to the module.
<Module: Debuggable(True, False)> 

Module DemoModule
    Sub Main()
        ' Get the module type information to access its metadata.
        Dim modType As Type = GetType(DemoModule)
        ' See if the Debuggable attribute is defined.
        Dim isDef As Boolean = Attribute.IsDefined(modType.Module, _
                               GetType(DebuggableAttribute))
        Dim strDef As String
        If isDef = True Then
            strDef = "is"
        Else
            strDef = "is not"
        End If
        ' Display the result
        Console.WriteLine("The debuggable attribute {0} defined for " & _
                          "module {1}.", strDef, modType.Name)
        ' If the attribute is defined, display the JIT settings.
        If isDef = True Then
            ' Retrieve the attribute itself.
            Dim attr As Attribute = _
                Attribute.GetCustomAttribute(modType.Module, _
                GetType(DebuggableAttribute))
            If Not attr Is Nothing And TypeOf attr Is DebuggableAttribute Then
                Dim dbgAttr As DebuggableAttribute = _
                    CType(attr, DebuggableAttribute)
                Console.WriteLine("JITTrackingEnabled is {0}.", _
                    dbgAttr.IsJITTrackingEnabled.ToString())
                Console.WriteLine("JITOptimizerDisabled is {0}.", _
                    dbgAttr.IsJITOptimizerDisabled.ToString())
            Else
                Console.WriteLine("The Debuggable attribute could " & _
                                  "not be retrieved.")
            End If
        End If
    End Sub
End Module

' Output:
' The debuggable attribute is defined for module DemoModule.
' JITTrackingEnabled is True.
' JITOptimizerDisabled is False.

GetCustomAttribute(MemberInfo, Type) GetCustomAttribute(MemberInfo, Type) GetCustomAttribute(MemberInfo, Type) GetCustomAttribute(MemberInfo, Type)

型のメンバーに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to a member of a type. 各パラメーターは、対象のメンバーと検索対象のカスタム属性の型を指定します。Parameters specify the member, and the type of the custom attribute to search for.

public:
 static Attribute ^ GetCustomAttribute(System::Reflection::MemberInfo ^ element, Type ^ attributeType);
public static Attribute GetCustomAttribute (System.Reflection.MemberInfo element, Type attributeType);
static member GetCustomAttribute : System.Reflection.MemberInfo * Type -> Attribute
Public Shared Function GetCustomAttribute (element As MemberInfo, attributeType As Type) As Attribute

パラメーター

element
MemberInfo MemberInfo MemberInfo MemberInfo

クラスのコンストラクター メンバー、イベント メンバー、フィールド メンバー、メソッド メンバー、またはプロパティ メンバーを記述する MemberInfo クラスから派生したオブジェクト。An object derived from the MemberInfo class that describes a constructor, event, field, method, or property member of a class.

attributeType
Type Type Type Type

検索対象とするカスタム属性の型または基本型。The type, or a base type, of the custom attribute to search for.

戻り値

attributeType に適用される element 型の単一のカスタム属性への参照。該当する属性がない場合は nullA reference to the single custom attribute of type attributeType that is applied to element, or null if there is no such attribute.

例外

element または attributeTypenull です。element or attributeType is null.

attributeTypeAttribute から派生していません。attributeType is not derived from Attribute.

elementがコンストラクター、メソッド、プロパティ、イベント、型、またはフィールドではありません。element is not a constructor, method, property, event, type, or field.

要求された属性が複数見つかりました。More than one of the requested attributes was found.

カスタム属性の型を読み込むことはできません。A custom attribute type cannot be loaded.

次のコード例の使用を示しています、GetCustomAttributeメソッドをMemberInfoをパラメーターとして。The following code example illustrates the use of the GetCustomAttribute method taking a MemberInfo as a parameter.

using namespace System;
using namespace System::Reflection;

namespace IsDef4CS
{
   public ref class TestClass
   {
   public:

      // Assign the Obsolete attribute to a method.

      [Obsolete("This method is obsolete. Use Method2 instead.")]
      void Method1(){}

      void Method2(){}

   };

   ref class DemoClass
   {
   public:
      static void Main()
      {
         
         // Get the class type to access its metadata.
         Type^ clsType = TestClass::typeid;
         
         // Get the MethodInfo object for Method1.
         MethodInfo^ mInfo = clsType->GetMethod( "Method1" );
         
         // See if the Obsolete attribute is defined for this method.
         bool isDef = Attribute::IsDefined( mInfo, ObsoleteAttribute::typeid );
         
         // Display the result.
         Console::WriteLine( "The Obsolete Attribute {0} defined for {1} of class {2}.", isDef ? (String^)"is" : "is not", mInfo->Name, clsType->Name );
         
         // If it's defined, display the attribute's message.
         if ( isDef )
         {
            ObsoleteAttribute^ obsAttr = dynamic_cast<ObsoleteAttribute^>(Attribute::GetCustomAttribute( mInfo, ObsoleteAttribute::typeid ));
            if ( obsAttr != nullptr )
                        Console::WriteLine( "The message is: \"{0}\".", obsAttr->Message );
            else
                        Console::WriteLine( "The message could not be retrieved." );
         }
      }

   };

}


/*
 * Output:
 * The Obsolete Attribute is defined for Method1 of class TestClass.
 * The message is: "This method is obsolete. Use Method2 instead.".
 */
using System;
using System.Reflection;

namespace IsDef4CS 
{
    public class TestClass 
    {
        // Assign the Obsolete attribute to a method.
        [Obsolete("This method is obsolete. Use Method2 instead.")]
        public void Method1()
        {}
        public void Method2()
        {}
    }

    public class DemoClass 
    {
        static void Main(string[] args) 
        {
            // Get the class type to access its metadata.
            Type clsType = typeof(TestClass);
            // Get the MethodInfo object for Method1.
            MethodInfo mInfo = clsType.GetMethod("Method1");
            // See if the Obsolete attribute is defined for this method.
            bool isDef = Attribute.IsDefined(mInfo, typeof(ObsoleteAttribute));
            // Display the result.
            Console.WriteLine("The Obsolete Attribute {0} defined for {1} of class {2}.",
                isDef ? "is" : "is not", mInfo.Name, clsType.Name);
            // If it's defined, display the attribute's message.
            if (isDef) 
            {
                ObsoleteAttribute obsAttr = 
                                 (ObsoleteAttribute)Attribute.GetCustomAttribute( 
                                                    mInfo, typeof(ObsoleteAttribute));
                if (obsAttr != null)
                    Console.WriteLine("The message is: \"{0}\".",
                        obsAttr.Message);
                else
                    Console.WriteLine("The message could not be retrieved.");
            }
        }
    }
}

/*
 * Output:
 * The Obsolete Attribute is defined for Method1 of class TestClass.
 * The message is: "This method is obsolete. Use Method2 instead.".
 */
Imports System
Imports System.Reflection

Module DemoModule

    Public Class TestClass
        ' Assign the Obsolete attribute to a method.
        <Obsolete("This method is obsolete. Use Method2() instead.")> _
        Public Sub Method1()
        End Sub

        Public Sub Method2()
        End Sub
    End Class

    Sub Main()
        ' Get the class type to access its metadata.
        Dim clsType As Type = GetType(TestClass)
        ' Get the MethodInfo object for Method1.
        Dim mInfo As MethodInfo = clsType.GetMethod("Method1")
        ' See if the Obsolete attribute is defined for this method.
        Dim isDef As Boolean = Attribute.IsDefined(mInfo, _
            GetType(ObsoleteAttribute))
        Dim strDef As String
        If isDef = True Then
            strDef = "is"
        Else
            strDef = "is not"
        End If
        ' Display the results.
        Console.WriteLine("The Obsolete attribute {0} defined for " & _
            "method {1} of class {2}.", strDef, mInfo.Name, clsType.Name)
        ' If it's defined, display the attribute's message.
        If isDef = True Then
            Dim attr As Attribute = Attribute.GetCustomAttribute(mInfo, _
                GetType(ObsoleteAttribute))
            If Not attr Is Nothing And TypeOf attr Is ObsoleteAttribute Then
                Dim obsAttr As ObsoleteAttribute = _
                    CType(attr, ObsoleteAttribute)
                Console.WriteLine("The message is: ""{0}""", obsAttr.Message)
            Else
                Console.WriteLine("The message could not be retrieved.")
            End If
        End If
    End Sub
End Module

' Output:
' The Obsolete attribute is defined for method Method1 of class TestClass.
' The message is: "This method is obsolete. Use Method2() instead."

注釈

戻り値のセクションで説明した同じ方法で、一致が決定Type.IsAssignableFromします。A match is determined in the same way described in the Return Value section of Type.IsAssignableFrom.

注意

以降、.NET Framework version 2.0 では、このメソッドを返しますセキュリティ属性を型、メソッド、およびコンス トラクターの属性が、新しいメタデータ形式で格納されている場合。Starting with the .NET Framework version 2.0, this method returns security attributes on types, methods, and constructors if the attributes are stored in the new metadata format. バージョン 2.0 以降でコンパイルされたアセンブリでは、新しい形式を使用します。Assemblies compiled with version 2.0 or later use the new format. 動的アセンブリと .NET Framework の以前のバージョンでコンパイルされたアセンブリは、以前の XML 形式を使用します。Dynamic assemblies and assemblies compiled with earlier versions of the .NET Framework use the old XML format. 参照してください宣言セキュリティ属性を出力します。See Emitting Declarative Security Attributes.

GetCustomAttribute(Assembly, Type) GetCustomAttribute(Assembly, Type) GetCustomAttribute(Assembly, Type) GetCustomAttribute(Assembly, Type)

指定したアセンブリに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to a specified assembly. 各パラメーターは、対象のアセンブリと検索対象のカスタム属性の型を指定します。Parameters specify the assembly and the type of the custom attribute to search for.

public:
 static Attribute ^ GetCustomAttribute(System::Reflection::Assembly ^ element, Type ^ attributeType);
public static Attribute GetCustomAttribute (System.Reflection.Assembly element, Type attributeType);
static member GetCustomAttribute : System.Reflection.Assembly * Type -> Attribute
Public Shared Function GetCustomAttribute (element As Assembly, attributeType As Type) As Attribute

パラメーター

element
Assembly Assembly Assembly Assembly

モジュールの再利用可能なコレクションを記述する Assembly クラスから派生したオブジェクト。An object derived from the Assembly class that describes a reusable collection of modules.

attributeType
Type Type Type Type

検索対象とするカスタム属性の型または基本型。The type, or a base type, of the custom attribute to search for.

戻り値

attributeType に適用される element 型の単一のカスタム属性への参照。該当する属性がない場合は nullA reference to the single custom attribute of type attributeType that is applied to element, or null if there is no such attribute.

例外

element または attributeTypenull です。element or attributeType is null.

attributeTypeAttribute から派生していません。attributeType is not derived from Attribute.

要求された属性が複数見つかりました。More than one of the requested attributes was found.

次のコード例の使用を示しています、GetCustomAttributeメソッドをAssemblyをパラメーターとして。The following code example illustrates the use of the GetCustomAttribute method taking an Assembly as a parameter.

using namespace System;
using namespace System::Reflection;

// Add an AssemblyDescription attribute
[assembly:AssemblyDescription("A sample description")];
namespace IsDef1CS
{
   ref class DemoClass
   {
   public:
      static void Main()
      {
         
         // Get the class type to access its metadata.
         Type^ clsType = DemoClass::typeid;
         
         // Get the assembly object.
         Assembly^ assy = clsType->Assembly;
         
         // Store the assembly's name.
         String^ assyName = assy->GetName()->Name;
         
         //Type assyType = assy.GetType();
         // See if the Assembly Description is defined.
         bool isdef = Attribute::IsDefined( assy, AssemblyDescriptionAttribute::typeid );
         if ( isdef )
         {
            
            // Affirm that the attribute is defined.
            Console::WriteLine( "The AssemblyDescription attribute "
            "is defined for assembly {0}.", assyName );
            
            // Get the description attribute itself.
            AssemblyDescriptionAttribute^ adAttr = dynamic_cast<AssemblyDescriptionAttribute^>(Attribute::GetCustomAttribute( assy, AssemblyDescriptionAttribute::typeid ));
            
            // Display the description.
            if ( adAttr != nullptr )
                        Console::WriteLine( "The description is \"{0}\".", adAttr->Description );
            else
                        Console::WriteLine( "The description could not "
            "be retrieved." );
         }
         else
                  Console::WriteLine( "The AssemblyDescription attribute is not "
         "defined for assembly {0}.", assyName );
      }

   };

}


/*
 * Output:
 * The AssemblyDescription attributeis defined for assembly IsDef1CS.
 * The description is "A sample description".
 */
using System;
using System.Reflection;

// Add an AssemblyDescription attribute
[assembly: AssemblyDescription("A sample description")]
namespace IsDef1CS
{
    public class DemoClass
    {
        static void Main(string[] args)
        {
            // Get the class type to access its metadata.
            Type clsType = typeof(DemoClass);
            // Get the assembly object.
            Assembly assy = clsType.Assembly;
            // Store the assembly's name.
            String assyName = assy.GetName().Name;
            // See if the Assembly Description is defined.
            bool isdef = Attribute.IsDefined(assy, 
                typeof(AssemblyDescriptionAttribute));
            if (isdef)
            {
                // Affirm that the attribute is defined.
                Console.WriteLine("The AssemblyDescription attribute " +
                    "is defined for assembly {0}.", assyName);
                // Get the description attribute itself.
                AssemblyDescriptionAttribute adAttr = 
                    (AssemblyDescriptionAttribute)Attribute.GetCustomAttribute(
                    assy, typeof(AssemblyDescriptionAttribute));
                // Display the description.
                if (adAttr != null)
                    Console.WriteLine("The description is \"{0}\".", 
                        adAttr.Description);
                else
                    Console.WriteLine("The description could not " +
                        "be retrieved.");            
            }
            else
                Console.WriteLine("The AssemblyDescription attribute is not " +
                    "defined for assembly {0}.", assyName);
        }
    }
}

/*
 * Output:
 * The AssemblyDescription attribute is defined for assembly IsDef1CS.
 * The description is "A sample description".
 */
Imports System
Imports System.Reflection
Imports Microsoft.VisualBasic

' Add an AssemblyDescription attribute.
<Assembly: AssemblyDescription("A sample description")> 

Module DemoModule
    Sub Main()
        ' Get the assembly for this module.
        Dim assy As System.Reflection.Assembly = GetType(DemoModule).Assembly
        ' Store the assembly name.
        Dim assyName As String = assy.GetName().Name
        ' See if the AssemblyDescription attribute is defined.
        If Attribute.IsDefined(assy, GetType(AssemblyDescriptionAttribute)) _
            Then
            ' Affirm that the attribute is defined. Assume the filename of
            ' this code example is "IsDef1VB".
            Console.WriteLine("The AssemblyDescription attribute is " & _
                "defined for assembly {0}.", assyName)
            ' Get the description attribute itself.
            Dim attr As Attribute = Attribute.GetCustomAttribute( _
                assy, GetType(AssemblyDescriptionAttribute))
            ' Display the description.
            If Not attr Is Nothing And _
                TypeOf attr Is AssemblyDescriptionAttribute Then
                Dim adAttr As AssemblyDescriptionAttribute = _
                    CType(attr, AssemblyDescriptionAttribute)
                Console.WriteLine("The description is " & _
                    Chr(34) & "{0}" & Chr(34) & ".", adAttr.Description)
            Else
                Console.WriteLine("The description could not be retrieved.")
            End If
        Else
            Console.WriteLine("The AssemblyDescription attribute is not " & _
                              "defined for assembly {0}.", assyName)
        End If
    End Sub
End Module

' Output:
' The AssemblyDescription attribute is defined for assembly IsDef1VB.
' The description is "A sample description".

注釈

使用して、GetCustomAttributesメソッドが返され、1 つ以上の値を期待する場合またはAmbiguousMatchExceptionがスローされます。Use the GetCustomAttributes method if you expect more than one value to be returned, or AmbiguousMatchException will be thrown.

注意

以降、.NET Framework version 2.0 としたこれらのこのメソッドは、セキュリティ属性に対して属性が、新しいメタデータ形式で格納されている場合を返します。Starting with the .NET Framework version 2.0, this method returns security attributes if the attributes are stored in the new metadata format. バージョン 2.0 以降でコンパイルされたアセンブリでは、新しい形式を使用します。Assemblies compiled with version 2.0 or later use the new format. 動的アセンブリと .NET Framework の以前のバージョンでコンパイルされたアセンブリは、以前の XML 形式を使用します。Dynamic assemblies and assemblies compiled with earlier versions of the .NET Framework use the old XML format. 参照してください宣言セキュリティ属性を出力します。See Emitting Declarative Security Attributes.

GetCustomAttribute(ParameterInfo, Type) GetCustomAttribute(ParameterInfo, Type) GetCustomAttribute(ParameterInfo, Type) GetCustomAttribute(ParameterInfo, Type)

メソッド パラメーターに適用されたカスタム属性を取得します。Retrieves a custom attribute applied to a method parameter. 各パラメーターは、対象のメソッド パラメーターと検索対象のカスタム属性の型を指定します。Parameters specify the method parameter, and the type of the custom attribute to search for.

public:
 static Attribute ^ GetCustomAttribute(System::Reflection::ParameterInfo ^ element, Type ^ attributeType);
public static Attribute GetCustomAttribute (System.Reflection.ParameterInfo element, Type attributeType);
static member GetCustomAttribute : System.Reflection.ParameterInfo * Type -> Attribute
Public Shared Function GetCustomAttribute (element As ParameterInfo, attributeType As Type) As Attribute

パラメーター

element
ParameterInfo ParameterInfo ParameterInfo ParameterInfo

クラスのメンバーのパラメーターを記述する ParameterInfo クラスから派生したオブジェクト。An object derived from the ParameterInfo class that describes a parameter of a member of a class.

attributeType
Type Type Type Type

検索対象とするカスタム属性の型または基本型。The type, or a base type, of the custom attribute to search for.

戻り値

attributeType に適用される element 型の単一のカスタム属性への参照。該当する属性がない場合は nullA reference to the single custom attribute of type attributeType that is applied to element, or null if there is no such attribute.

例外

element または attributeTypenull です。element or attributeType is null.

attributeTypeAttribute から派生していません。attributeType is not derived from Attribute.

要求された属性が複数見つかりました。More than one of the requested attributes was found.

カスタム属性の型を読み込むことはできません。A custom attribute type cannot be loaded.

次のコード例は、カスタム パラメーターを定義します。Attributeクラスと派生クラスと派生クラスの基本のメソッドにカスタム属性を適用します。The following code example defines a custom parameter Attribute class and applies the custom attribute to a method in a derived class and the base of the derived class. 使用例を示します、GetCustomAttribute属性を返します。The example shows the use of the GetCustomAttribute method to return the attributes.

// Example for the Attribute::GetCustomAttribute( ParameterInfo*, Type* ) 
// method.
using namespace System;
using namespace System::Collections;
using namespace System::Reflection;

namespace NDP_UE_CPP
{

   // Define a custom parameter attribute that takes a single message argument.

   [AttributeUsage(AttributeTargets::Parameter)]
   public ref class ArgumentUsageAttribute: public Attribute
   {
   protected:

      // usageMsg is storage for the attribute message.
      String^ usageMsg;

   public:

      // This is the attribute constructor.
      ArgumentUsageAttribute( String^ UsageMsg )
      {
         this->usageMsg = UsageMsg;
      }


      property String^ Message 
      {
         // This is the Message property for the attribute.
         String^ get()
         {
            return usageMsg;
         }

         void set( String^ value )
         {
            this->usageMsg = value;
         }
      }
   };

   public ref class BaseClass
   {
   public:

      // Assign an ArgumentUsage attribute to the strArray parameter.
      // Assign a ParamArray attribute to strList.
      virtual void TestMethod( [ArgumentUsage("Must pass an array here.")]array<String^>^strArray,
                               ...array<String^>^strList ){}
   };

   public ref class DerivedClass: public BaseClass
   {
   public:

      // Assign an ArgumentUsage attributes to the strList parameter.
      virtual void TestMethod( array<String^>^strArray, [ArgumentUsage(
      "Can pass a parameter list or array here.")]array<String^>^strList ) override {}
   };
}

int main()
{
   Console::WriteLine( "This example of Attribute::GetCustomAttribute( Param"
   "eterInfo*, Type* )\ngenerates the following output." );

   // Get the class type, and then get the MethodInfo object 
   // for TestMethod to access its metadata.
   Type^ clsType = NDP_UE_CPP::DerivedClass::typeid;
   MethodInfo^ mInfo = clsType->GetMethod( "TestMethod" );

   // Iterate through the ParameterInfo array for the method parameters.
   array<ParameterInfo^>^pInfoArray = mInfo->GetParameters();
   if ( pInfoArray != nullptr )
   {
      // This implements foreach( ParameterInfo* paramInfo in pInfoArray ).
      IEnumerator^ myEnum = pInfoArray->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         ParameterInfo^ paramInfo = safe_cast<ParameterInfo^>(myEnum->Current);

         // See if the ParamArray attribute is defined.
         bool isDef = Attribute::IsDefined( paramInfo, ParamArrayAttribute::typeid );
         if ( isDef )
                  Console::WriteLine( "\nThe ParamArray attribute is defined for \n"
         "parameter {0} of method {1}.", paramInfo->Name, mInfo->Name );

         // See if ParamUsageAttribute is defined.  
         // If so, display a message.
         NDP_UE_CPP::ArgumentUsageAttribute^ usageAttr = static_cast<NDP_UE_CPP::ArgumentUsageAttribute^>(Attribute::GetCustomAttribute( paramInfo, NDP_UE_CPP::ArgumentUsageAttribute::typeid ));
         if ( usageAttr != nullptr )
         {
            Console::WriteLine( "\nThe ArgumentUsage attribute is defined for \n"
            "parameter {0} of method {1}.", paramInfo->Name, mInfo->Name );
            Console::WriteLine( "\n    The usage "
            "message for {0} is:\n    \"{1}\".", paramInfo->Name, usageAttr->Message );
         }
      }
   }
   else
      Console::WriteLine( "The parameters information could "
   "not be retrieved for method {0}.", mInfo->Name );
}

/*
This example of Attribute::GetCustomAttribute( ParameterInfo*, Type* )
generates the following output.

The ArgumentUsage attribute is defined for
parameter strArray of method TestMethod.

    The usage message for strArray is:
    "Must pass an array here.".

The ParamArray attribute is defined for
parameter strList of method TestMethod.

The ArgumentUsage attribute is defined for
parameter strList of method TestMethod.

    The usage message for strList is:
    "Can pass a parameter list or array here.".
*/
// Example for the Attribute.GetCustomAttribute( ParameterInfo, Type ) method.
using System;
using System.Reflection;

namespace NDP_UE_CS 
{
    // Define a custom parameter attribute that takes a single message argument.
    [AttributeUsage( AttributeTargets.Parameter )]
    public class ArgumentUsageAttribute : Attribute
    {
        // This is the attribute constructor.
        public ArgumentUsageAttribute( string UsageMsg )
        {
            this.usageMsg = UsageMsg;
        }

        // usageMsg is storage for the attribute message.
        protected string usageMsg;

        // This is the Message property for the attribute.
        public string Message
        {
            get { return usageMsg; }
            set { usageMsg = value; }
        }
    }

    public class BaseClass 
    {
        // Assign an ArgumentUsage attribute to the strArray parameter.
        // Assign a ParamArray attribute to strList using the params keyword.
        public virtual void TestMethod(
            [ArgumentUsage("Must pass an array here.")]
            String[] strArray,
            params String[] strList)
        { }
    }

    public class DerivedClass : BaseClass
    {
        // Assign an ArgumentUsage attribute to the strList parameter.
        // Assign a ParamArray attribute to strList using the params keyword.
        public override void TestMethod(
            String[] strArray,
            [ArgumentUsage("Can pass a parameter list or array here.")]
            params String[] strList)
        { }
    }

    class CustomParamDemo 
    {
        static void Main( ) 
        {
            Console.WriteLine( 
                "This example of Attribute.GetCustomAttribute( Param" +
                "eterInfo, Type )\ngenerates the following output." );

            // Get the class type, and then get the MethodInfo object 
            // for TestMethod to access its metadata.
            Type clsType = typeof( DerivedClass );
            MethodInfo mInfo = clsType.GetMethod("TestMethod");

            // Iterate through the ParameterInfo array for the method parameters.
            ParameterInfo[] pInfoArray = mInfo.GetParameters();
            if (pInfoArray != null) 
            {
                foreach( ParameterInfo paramInfo in pInfoArray )
                {
                    // See if the ParamArray attribute is defined.
                    bool isDef = Attribute.IsDefined( 
                        paramInfo, typeof(ParamArrayAttribute));

                    if( isDef )
                        Console.WriteLine( 
                            "\nThe ParamArray attribute is defined " +
                            "for \nparameter {0} of method {1}.",
                            paramInfo.Name, mInfo.Name);

                    // See if ParamUsageAttribute is defined.  
                    // If so, display a message.
                    ArgumentUsageAttribute usageAttr = (ArgumentUsageAttribute)
                        Attribute.GetCustomAttribute( 
                            paramInfo, typeof(ArgumentUsageAttribute) );

                    if( usageAttr != null )
                    {
                        Console.WriteLine( 
                            "\nThe ArgumentUsage attribute is defined " +
                            "for \nparameter {0} of method {1}.",
                            paramInfo.Name, mInfo.Name );

                        Console.WriteLine( "\n    The usage " +
                            "message for {0} is:\n    \"{1}\".",
                            paramInfo.Name, usageAttr.Message);
                    }
                }
            }
            else
                Console.WriteLine( 
                    "The parameters information could not " +
                    "be retrieved for method {0}.", mInfo.Name);
        }
    }
}

/*
This example of Attribute.GetCustomAttribute( ParameterInfo, Type )
generates the following output.

The ArgumentUsage attribute is defined for
parameter strArray of method TestMethod.

    The usage message for strArray is:
    "Must pass an array here.".

The ParamArray attribute is defined for
parameter strList of method TestMethod.

The ArgumentUsage attribute is defined for
parameter strList of method TestMethod.

    The usage message for strList is:
    "Can pass a parameter list or array here.".
*/
' Example for the Attribute.GetCustomAttribute( ParameterInfo, Type ) method.
Imports System
Imports System.Reflection
Imports Microsoft.VisualBasic

Namespace NDP_UE_VB

    ' Define a custom parameter attribute that takes a single message argument.
    <AttributeUsage(AttributeTargets.Parameter)>  _
    Public Class ArgumentUsageAttribute
        Inherits Attribute
           
        ' This is the attribute constructor.
        Public Sub New(UsageMsg As String)
            Me.usageMsg = UsageMsg
        End Sub ' New

        ' usageMsg is storage for the attribute message.
        Protected usageMsg As String
           
        ' This is the Message property for the attribute.
        Public Property Message() As String
            Get
                Return usageMsg
            End Get
            Set
                usageMsg = value
            End Set
        End Property
    End Class ' ArgumentUsageAttribute 

    Public Class BaseClass
       
        ' Assign an ArgumentUsage attribute to the strArray parameter.
        ' Assign a ParamArray attribute to strList using the ParamArray keyword.
        Public Overridable Sub TestMethod( _
            <ArgumentUsage("Must pass an array here.")> _
            strArray() As String, _
            ParamArray strList() As String)
        End Sub ' TestMethod
    End Class ' BaseClass

    Public Class DerivedClass
        Inherits BaseClass
           
        ' Assign an ArgumentUsage attribute to the strList parameter.
        ' Assign a ParamArray attribute to strList using the ParamArray keyword.
        Public Overrides Sub TestMethod( _
            strArray() As String, _
            <ArgumentUsage("Can pass a parameter list or array here.")> _
            ParamArray strList() As String)
        End Sub ' TestMethod
    End Class ' DerivedClass

    Module CustomParamDemo
       
        Sub Main()
            Console.WriteLine( _
                "This example of Attribute.GetCustomAttribute" & _
                "( ParameterInfo, Type )" & vbCrLf & _
                "generates the following output.")
              
            ' Get the class type, and then get the MethodInfo object 
            ' for TestMethod to access its metadata.
            Dim clsType As Type = GetType(DerivedClass)
            Dim mInfo As MethodInfo = clsType.GetMethod("TestMethod")
              
            ' Iterate through the ParameterInfo array for the method parameters.
            Dim pInfoArray As ParameterInfo() = mInfo.GetParameters()
            If Not (pInfoArray Is Nothing) Then
                Dim paramInfo As ParameterInfo
                For Each paramInfo In  pInfoArray

                    ' See if the ParamArray attribute is defined.
                    Dim isDef As Boolean = _
                        Attribute.IsDefined(paramInfo, _
                            GetType(ParamArrayAttribute))

                    If isDef Then
                        Console.WriteLine( vbCrLf & _
                            "The ParamArray attribute is defined for " & _
                            vbCrLf & "parameter {0} of method {1}.", _
                            paramInfo.Name, mInfo.Name)
                    End If
                    
                    ' See if ParamUsageAttribute is defined.  
                    ' If so, display a message.
                    Dim usageAttr As ArgumentUsageAttribute = _
                        Attribute.GetCustomAttribute(paramInfo, _
                            GetType(ArgumentUsageAttribute))

                    If Not (usageAttr Is Nothing) Then
                        Console.WriteLine( vbCrLf & "The " & _
                            "ArgumentUsage attribute is defined for " & _
                            vbCrLf & "parameter {0} of method {1}.", _
                            paramInfo.Name, mInfo.Name)
                        Console.WriteLine( vbCrLf & _
                            "    The usage message for {0} is: " & _
                            vbCrLf & "    ""{1}"".", _
                            paramInfo.Name, usageAttr.Message)
                    End If
                Next paramInfo
            Else
                Console.WriteLine( _
                    "The parameters information could " & _
                    "not be retrieved for method {0}.", mInfo.Name)
            End If
        End Sub ' Main

    End Module ' DemoClass
End Namespace ' NDP_UE_VB

' This example of Attribute.GetCustomAttribute( ParameterInfo, Type )
' generates the following output.
' 
' The ArgumentUsage attribute is defined for
' parameter strArray of method TestMethod.
' 
'     The usage message for strArray is:
'     "Must pass an array here.".
' 
' The ParamArray attribute is defined for
' parameter strList of method TestMethod.
' 
' The ArgumentUsage attribute is defined for
' parameter strList of method TestMethod.
' 
'     The usage message for strList is:
'     "Can pass a parameter list or array here.".

注釈

場合element派生型のメソッド内のパラメーターを表す、戻り値には、同じパラメーターでオーバーライドされる基本メソッドに適用される継承可能なカスタム属性が含まれています。If element represents a parameter in a method of a derived type, the return value includes the inheritable custom attributes applied to the same parameter in the overridden base methods.

適用対象