CustomAttributeBuilder クラス

.NET Framework クラス ライブラリ リファレンス

CustomAttributeBuilder クラス

カスタム属性の構築を支援します。

名前空間: System.Reflection.Emit
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

<ComVisibleAttribute(True)> _
<ClassInterfaceAttribute(ClassInterfaceType.None)> _
Public Class CustomAttributeBuilder
    Implements _CustomAttributeBuilder

Visual Basic (使用法)

Dim instance As CustomAttributeBuilder

C#

[ComVisibleAttribute(true)] 
[ClassInterfaceAttribute(ClassInterfaceType.None)] 
public class CustomAttributeBuilder : _CustomAttributeBuilder

C++

[ComVisibleAttribute(true)] 
[ClassInterfaceAttribute(ClassInterfaceType::None)] 
public ref class CustomAttributeBuilder : _CustomAttributeBuilder

J#

/** @attribute ComVisibleAttribute(true) */ 
/** @attribute ClassInterfaceAttribute(ClassInterfaceType.None) */ 
public class CustomAttributeBuilder implements
 _CustomAttributeBuilder

JScript

ComVisibleAttribute(true) 
ClassInterfaceAttribute(ClassInterfaceType.None) 
public class CustomAttributeBuilder implements
 _CustomAttributeBuilder

解説

メモ
このクラスに適用される HostProtectionAttribute 属性の Resources プロパティの値は、MayLeakOnAbort です。HostProtectionAttribute は、デスクトップ アプリケーション (一般的には、アイコンをダブルクリック、コマンドを入力、またはブラウザに URL を入力して起動するアプリケーション) には影響しません。詳細については、HostProtectionAttribute クラスのトピックまたは「SQL Server プログラミングとホスト保護属性」を参照してください。

コンストラクタから返された CustomAttributeBuilder オブジェクトを使用して、カスタム属性を記述します。SetCustomAttribute メソッドをビルダ インスタンス対して呼び出すことで、CustomAttribute をそのビルダ インスタンスに関連付けます。たとえば、AssemblyCultureAttribute のコンストラクタとその引数を指定することで、CustomAttributeBuilder を作成して AssemblyCultureAttribute のインスタンスを記述します。次に、AssemblyBuilder に対して SetCustomAttribute を呼び出すことで、関連付けを作成します。

使用例

CustomAttributeBuilder の使用方法については、次のコード例を参照してください。

Visual Basic

Imports System
Imports System.Threading
Imports System.Reflection
Imports System.Reflection.Emit

 _


' We will apply this custom attribute to our dynamic type.
Public Class ClassCreator

   Inherits Attribute
   
   Private creator As String
   
   Public ReadOnly Property
 GetCreator() As String
      Get
         Return creator
      End Get
   End Property
   
   
   Public Sub New(name As
 String)
      Me.creator = name
   End Sub 'New

End Class 'ClassCreator
 _ 

' We will apply this dynamic attribute to our dynamic method.
Public Class DateLastUpdated

   Inherits Attribute
   
   Private dateUpdated As String
   
   Public ReadOnly Property
 GetDateUpdated() As String
      Get
         Return dateUpdated
      End Get
   End Property
   
   
   Public Sub New(theDate
 As String)
      Me.dateUpdated = theDate
   End Sub 'New

End Class 'DateLastUpdated
 _ 

Class MethodBuilderCustomAttributesDemo
   
   Public Shared Function
 BuildTypeWithCustomAttributesOnMethod() As Type
      
      Dim currentDomain As AppDomain = Thread.GetDomain()
      
      Dim myAsmName As New
 AssemblyName()
      myAsmName.Name = "MyAssembly"
      
      Dim myAsmBuilder As AssemblyBuilder =
 currentDomain.DefineDynamicAssembly(myAsmName, _
                            AssemblyBuilderAccess.Run)
      
      Dim myModBuilder As ModuleBuilder = myAsmBuilder.DefineDynamicModule("MyModule")
      
      ' First, we'll build a type with a custom attribute attached.
      Dim myTypeBuilder As TypeBuilder = myModBuilder.DefineType("MyType",
 _
                            TypeAttributes.Public)
      
      Dim ctorParams() As Type = {GetType(String)}
      Dim classCtorInfo As ConstructorInfo
 = GetType(ClassCreator).GetConstructor(ctorParams)
      
      Dim myCABuilder As New
 CustomAttributeBuilder(classCtorInfo, _
                        New Object() {"Joe
 Programmer"})
      
      myTypeBuilder.SetCustomAttribute(myCABuilder)
      
      ' Now, let's build a method and add a custom attribute to it.
      Dim myMethodBuilder As MethodBuilder
 = myTypeBuilder.DefineMethod("HelloWorld", _
                    MethodAttributes.Public, Nothing, New
 Type() {})
      
      ctorParams = New Type() {GetType(String)}
      classCtorInfo = GetType(DateLastUpdated).GetConstructor(ctorParams)
      
      Dim myCABuilder2 As New
 CustomAttributeBuilder(classCtorInfo, _
                        New Object() {DateTime.Now.ToString()})
      
      myMethodBuilder.SetCustomAttribute(myCABuilder2)
      
      Dim myIL As ILGenerator = myMethodBuilder.GetILGenerator()
      
      myIL.EmitWriteLine("Hello, world!")
      myIL.Emit(OpCodes.Ret)
      
      Return myTypeBuilder.CreateType()

   End Function 'BuildTypeWithCustomAttributesOnMethod
    
   
   Public Shared Sub Main()
      
      Dim myType As Type = BuildTypeWithCustomAttributesOnMethod()
      
      Dim myInstance As Object
 = Activator.CreateInstance(myType)
      
      Dim customAttrs As Object()
 = myType.GetCustomAttributes(True)
      
      Console.WriteLine("Custom Attributes for Type 'MyType':")
      
      Dim attrVal As Object
 = Nothing
      
      Dim customAttr As Object
      For Each customAttr In
  customAttrs
         attrVal = GetType(ClassCreator).InvokeMember("GetCreator",
 _
                        BindingFlags.GetProperty, _
                        Nothing, customAttr, New
 Object() {})
         Console.WriteLine("-- Attribute: [{0} = ""{1}""]",
 customAttr, attrVal)
      Next customAttr
      
      Console.WriteLine("Custom Attributes for Method 'HelloWorld()'
 in 'MyType':")
      
      customAttrs = myType.GetMember("HelloWorld")(0).GetCustomAttributes(True)
      
      For Each customAttr In
  customAttrs
         attrVal = GetType(DateLastUpdated).InvokeMember("GetDateUpdated",
 _
                        BindingFlags.GetProperty, _
                        Nothing, customAttr, New
 Object() {})
         Console.WriteLine("-- Attribute: [{0} = ""{1}""]",
 customAttr, attrVal)
      Next customAttr
      
      Console.WriteLine("---")
      
      Console.WriteLine(myType.InvokeMember("HelloWorld",
 BindingFlags.InvokeMethod, _
                        Nothing, myInstance, New
 Object() {}))
   End Sub 'Main

End Class 'MethodBuilderCustomAttributesDemo

C#

using System;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;


// We will apply this custom attribute to our dynamic type.
public class ClassCreator: Attribute

{
   private string creator;
   public string Creator 
   {
    get
    {
       return creator;
    }
   }    

   public ClassCreator(string name)
   {
      this.creator = name;
   }

}

// We will apply this dynamic attribute to our dynamic method.
public class DateLastUpdated: Attribute

{
   private string dateUpdated;
   public string DateUpdated
   {
       get
    {
       return dateUpdated;
    }
   }

   public DateLastUpdated(string theDate)
   {
    this.dateUpdated = theDate;
   } 

}

class MethodBuilderCustomAttributesDemo

{

   public static Type BuildTypeWithCustomAttributesOnMethod()
   {
    
    AppDomain currentDomain = Thread.GetDomain();
    
    AssemblyName myAsmName = new AssemblyName();
    myAsmName.Name = "MyAssembly";

    AssemblyBuilder myAsmBuilder = currentDomain.DefineDynamicAssembly(
                       myAsmName, AssemblyBuilderAccess.Run);

    ModuleBuilder myModBuilder = myAsmBuilder.DefineDynamicModule("MyModule");

    // First, we'll build a type with a custom attribute attached.

    TypeBuilder myTypeBuilder = myModBuilder.DefineType("MyType",
                        TypeAttributes.Public);
    
    Type[] ctorParams = new Type[] { typeof(string)
 };
    ConstructorInfo classCtorInfo = typeof(ClassCreator).GetConstructor(ctorParams);

    CustomAttributeBuilder myCABuilder = new CustomAttributeBuilder(
                        classCtorInfo,
                        new object[] { "Joe Programmer"
 });

    myTypeBuilder.SetCustomAttribute(myCABuilder);

    // Now, let's build a method and add a custom attribute to it.

    MethodBuilder myMethodBuilder = myTypeBuilder.DefineMethod("HelloWorld"
,
                    MethodAttributes.Public,
                    null,
                    new Type[] { });

    ctorParams = new Type[] { typeof(string)
 };
    classCtorInfo = typeof(DateLastUpdated).GetConstructor(ctorParams);

    CustomAttributeBuilder myCABuilder2 = new CustomAttributeBuilder(
                        classCtorInfo,
                        new object[] { DateTime.Now.ToString()
 });

    myMethodBuilder.SetCustomAttribute(myCABuilder2);

    ILGenerator myIL = myMethodBuilder.GetILGenerator();

    myIL.EmitWriteLine("Hello, world!");
    myIL.Emit(OpCodes.Ret);

    return myTypeBuilder.CreateType();
    
   }

   public static void Main()
 
   {

    Type myType = BuildTypeWithCustomAttributesOnMethod();

    object myInstance = Activator.CreateInstance(myType);

    object[] customAttrs = myType.GetCustomAttributes(true);

    Console.WriteLine("Custom Attributes for Type 'MyType':");

    object attrVal = null;

    foreach (object customAttr in customAttrs)
 
       {
       attrVal = typeof(ClassCreator).InvokeMember("Creator", 
                      BindingFlags.GetProperty,
                      null, customAttr, new
 object[] { });
       Console.WriteLine("-- Attribute: [{0} = \"{1}\"]", customAttr,
 attrVal);
        }

    Console.WriteLine("Custom Attributes for Method 'HelloWorld()'
 in 'MyType':");

    customAttrs = myType.GetMember("HelloWorld")[0].GetCustomAttributes(true);
    

    foreach (object customAttr in customAttrs)
 
       {
       attrVal = typeof(DateLastUpdated).InvokeMember("DateUpdated", 
                      BindingFlags.GetProperty,
                      null, customAttr, new
 object[] { });
       Console.WriteLine("-- Attribute: [{0} = \"{1}\"]", customAttr,
 attrVal);
        }

    Console.WriteLine("---");

    Console.WriteLine(myType.InvokeMember("HelloWorld",
              BindingFlags.InvokeMethod,
              null, myInstance, new object[]
 { }));
                           
    
   }

}

C++

using namespace System;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;

// We will apply this custom attribute to our dynamic type.
public ref class ClassCreator: public
 Attribute
{
private:
   String^ creator;

public:

   property String^ Creator 
   {
      String^ get()
      {
         return creator;
      }

   }
   ClassCreator( String^ name )
   {
      this->creator = name;
   }

};


// We will apply this dynamic attribute to our dynamic method.
public ref class DateLastUpdated: public
 Attribute
{
private:
   String^ dateUpdated;

public:

   property String^ DateUpdated 
   {
      String^ get()
      {
         return dateUpdated;
      }

   }
   DateLastUpdated( String^ theDate )
   {
      this->dateUpdated = theDate;
   }

};

Type^ BuildTypeWithCustomAttributesOnMethod()
{
   AppDomain^ currentDomain = Thread::GetDomain();
   AssemblyName^ myAsmName = gcnew AssemblyName;
   myAsmName->Name = "MyAssembly";
   AssemblyBuilder^ myAsmBuilder = currentDomain->DefineDynamicAssembly( myAsmName,
 AssemblyBuilderAccess::Run );
   ModuleBuilder^ myModBuilder = myAsmBuilder->DefineDynamicModule( "MyModule"
 );
   
   // First, we'll build a type with a custom attribute attached.
   TypeBuilder^ myTypeBuilder = myModBuilder->DefineType( "MyType",
 TypeAttributes::Public );
   array<Type^>^temp6 = {String::typeid};
   array<Type^>^ctorParams = temp6;
   ConstructorInfo^ classCtorInfo = ClassCreator::typeid->GetConstructor( ctorParams
 );
   array<Object^>^temp0 = {"Joe Programmer"};
   CustomAttributeBuilder^ myCABuilder = gcnew CustomAttributeBuilder( classCtorInfo,temp0
 );
   myTypeBuilder->SetCustomAttribute( myCABuilder );
   
   // Now, let's build a method and add a custom attribute to it.
   array<Type^>^temp1 = gcnew array<Type^>(0);
   MethodBuilder^ myMethodBuilder = myTypeBuilder->DefineMethod( "HelloWorld",
 MethodAttributes::Public, nullptr, temp1 );
   array<Type^>^temp7 = {String::typeid};
   ctorParams = temp7;
   classCtorInfo = DateLastUpdated::typeid->GetConstructor( ctorParams );
   array<Object^>^temp2 = {DateTime::Now.ToString()};
   CustomAttributeBuilder^ myCABuilder2 = gcnew CustomAttributeBuilder( classCtorInfo,temp2
 );
   myMethodBuilder->SetCustomAttribute( myCABuilder2 );
   ILGenerator^ myIL = myMethodBuilder->GetILGenerator();
   myIL->EmitWriteLine( "Hello, world!" );
   myIL->Emit( OpCodes::Ret );
   return myTypeBuilder->CreateType();
}

int main()
{
   Type^ myType = BuildTypeWithCustomAttributesOnMethod();
   Object^ myInstance = Activator::CreateInstance( myType );
   array<Object^>^customAttrs = myType->GetCustomAttributes( true
 );
   Console::WriteLine( "Custom Attributes for Type 'MyType':"
 );
   Object^ attrVal = nullptr;
   System::Collections::IEnumerator^ myEnum = customAttrs->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Object^ customAttr = safe_cast<Object^>(myEnum->Current);
      array<Object^>^temp3 = gcnew array<Object^>(0);
      attrVal = ClassCreator::typeid->InvokeMember( "Creator", BindingFlags::GetProperty,
 nullptr, customAttr, temp3 );
      Console::WriteLine( "-- Attribute: [{0} = \"{1}\"]", customAttr,
 attrVal );
   }

   Console::WriteLine( "Custom Attributes for Method 'HelloWorld()'
 in 'MyType':" );
   customAttrs = myType->GetMember( "HelloWorld" )[ 0 ]->GetCustomAttributes(
 true );
   System::Collections::IEnumerator^ myEnum2 = customAttrs->GetEnumerator();
   while ( myEnum2->MoveNext() )
   {
      Object^ customAttr = safe_cast<Object^>(myEnum2->Current);
      array<Object^>^temp4 = gcnew array<Object^>(0);
      attrVal = DateLastUpdated::typeid->InvokeMember( "DateUpdated",
 BindingFlags::GetProperty, nullptr, customAttr, temp4 );
      Console::WriteLine( "-- Attribute: [{0} = \"{1}\"]", customAttr,
 attrVal );
   }

   Console::WriteLine( "---" );
   array<Object^>^temp5 = gcnew array<Object^>(0);
   Console::WriteLine( myType->InvokeMember( "HelloWorld", BindingFlags::InvokeMethod,
 nullptr, myInstance, temp5 ) );
}

J#

import System.*;
import System.Threading.*;
import System.Reflection.*;
import System.Reflection.Emit.*;

// We will apply this custom attribute to our dynamic type.
public class ClassCreator extends Attribute
{
    private String creator;

    /** @property 
     */
    public String get_Creator()
    {
        return creator ;
    } //get_Creator

    public ClassCreator(String name) 
    {
        this.creator = name;
    } //ClassCreator
} //ClassCreator

// We will apply this dynamic attribute to our dynamic method.
public class DateLastUpdated extends Attribute
{
    private String dateUpdated;
    /** @property 
     */
    public String get_DateUpdated()
    {
        return dateUpdated ;
    } //get_DateUpdated

    public DateLastUpdated(String theDate) 
    {
        this.dateUpdated = theDate;
    } //DateLastUpdated
} //DateLastUpdated

class MethodBuilderCustomAttributesDemo
{
    public static Type BuildTypeWithCustomAttributesOnMethod()
 
    {
        AppDomain currentDomain = System.Threading.Thread.GetDomain();
        AssemblyName myAsmName = new AssemblyName();
        myAsmName.set_Name("MyAssembly");
        AssemblyBuilder myAsmBuilder = currentDomain.DefineDynamicAssembly(
            myAsmName, AssemblyBuilderAccess.Run);
        ModuleBuilder myModBuilder =
            myAsmBuilder.DefineDynamicModule("MyModule");
        // First, we'll build a type with a custom attribute attached.
        TypeBuilder myTypeBuilder = myModBuilder.DefineType(
            "MyType", TypeAttributes.Public);
        Type ctorParams[] = new Type[]{String.class.ToType()};
        ConstructorInfo classCtorInfo = 
            ClassCreator.class.ToType().GetConstructor(ctorParams);
        CustomAttributeBuilder myCABuilder =  
            new CustomAttributeBuilder(classCtorInfo,
            new Object[]{"Joe Programmer"});
        myTypeBuilder.SetCustomAttribute(myCABuilder);

        // Now, let's build a method and add a custom attribute to it.
        MethodBuilder myMethodBuilder = myTypeBuilder.DefineMethod(
            "HelloWorld", MethodAttributes.Public, null,
 new Type[]{});
        ctorParams = new Type[]{String.class.ToType()};
        classCtorInfo =
            DateLastUpdated.class.ToType().GetConstructor(ctorParams);
        CustomAttributeBuilder myCABuilder2 = new CustomAttributeBuilder(
            classCtorInfo, new Object[]{DateTime.get_Now().ToString()});
        myMethodBuilder.SetCustomAttribute(myCABuilder2);
        ILGenerator myIL = myMethodBuilder.GetILGenerator();
        myIL.EmitWriteLine("Hello, world!");
        myIL.Emit(OpCodes.Ret);      
        return myTypeBuilder.CreateType() ;
    } //BuildTypeWithCustomAttributesOnMethod

    public static void main(String[]
 args)
    {
        Type myType = BuildTypeWithCustomAttributesOnMethod();      
        Object myInstance = Activator.CreateInstance(myType);      
        Object customAttrs[] = myType.GetCustomAttributes(true);
      
        Console.WriteLine("Custom Attributes for Type 'MyType':");
      
        Object attrVal = null;
        for (int iCtr=0; iCtr < customAttrs.length;
 iCtr++) {
            Object customAttr = customAttrs[iCtr];
            attrVal = ClassCreator.class.ToType().InvokeMember
                ("Creator", BindingFlags.GetProperty, null,
 customAttr,
                new Object[] {});
            Console.WriteLine(
                "-- Attribute: [{0} = \"{1}\"]", customAttr,attrVal);
        }      
        Console.WriteLine(
            "Custom Attributes for Method 'HelloWorld()'
 in 'MyType':");      
        customAttrs =
            myType.GetMember("HelloWorld")[0].GetCustomAttributes(true);
        for(int iCtr = 0; iCtr < customAttrs.length;
 iCtr++) {
            Object customAttr = customAttrs[iCtr];
            attrVal = DateLastUpdated.class.ToType().InvokeMember(
                "DateUpdated", BindingFlags.GetProperty, null,
 
                customAttr, new Object[] {});
            Console.WriteLine(
                "-- Attribute: [{0} = \"{1}\"]",customAttr, attrVal);
        }      
        Console.WriteLine("---");      
        Console.WriteLine(myType.InvokeMember(
            "HelloWorld", BindingFlags.InvokeMethod, null,
 
            myInstance, new Object[] {}));
    } //main
} //MethodBuilderCustomAttributesDemo

継承階層

System.Object
  System.Reflection.Emit.CustomAttributeBuilder

スレッド セーフ

この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバの場合は、スレッド セーフであるとは限りません。

プラットフォーム

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
CustomAttributeBuilder メンバ
System.Reflection.Emit 名前空間