CustomAttributeBuilder クラス
カスタム属性の構築を支援します。
この型のすべてのメンバの一覧については、CustomAttributeBuilder メンバ を参照してください。
System.Object
System.Reflection.Emit.CustomAttributeBuilder
Public Class CustomAttributeBuilder
[C#]
public class CustomAttributeBuilder
[C++]
public __gc class CustomAttributeBuilder
[JScript]
public class CustomAttributeBuilder
スレッドセーフ
Reflection Emit は、Boolean パラメータ isSynchronized を true に設定して呼び出した AppDomain.DefineDynamicAssembly メソッドで作成されたアセンブリを使用する場合は、スレッド セーフです。
解説
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
[Visual Basic, C#, C++] 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。
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 <mscorlib.dll>
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 __gc class ClassCreator : public Attribute {
private:
String* creator;
public:
__property String* get_Creator() {
return creator;
}
public:
ClassCreator(String* name) {
this->creator = name;
}
};
// We will apply this dynamic attribute to our dynamic method.
public __gc class DateLastUpdated : public Attribute {
private:
String* dateUpdated;
public:
__property String* get_DateUpdated() {
return dateUpdated;
}
public:
DateLastUpdated(String* theDate) {
this->dateUpdated = theDate;
}
};
Type* BuildTypeWithCustomAttributesOnMethod() {
AppDomain* currentDomain = Thread::GetDomain();
AssemblyName* myAsmName = new AssemblyName();
myAsmName->Name = S"MyAssembly";
AssemblyBuilder* myAsmBuilder = currentDomain->DefineDynamicAssembly(myAsmName, AssemblyBuilderAccess::Run);
ModuleBuilder* myModBuilder = myAsmBuilder->DefineDynamicModule(S"MyModule");
// First, we'll build a type with a custom attribute attached.
TypeBuilder* myTypeBuilder = myModBuilder->DefineType(S"MyType",
TypeAttributes::Public);
Type* temp6 [] = {__typeof(String)};
Type* ctorParams[] = temp6;
ConstructorInfo* classCtorInfo = __typeof(ClassCreator)->GetConstructor(ctorParams);
Object* temp0 [] = {S"Joe Programmer"};
CustomAttributeBuilder* myCABuilder = new CustomAttributeBuilder(classCtorInfo, temp0);
myTypeBuilder->SetCustomAttribute(myCABuilder);
// Now, let's build a method and add a custom attribute to it.
Type* temp1 [] = new Type*[0];
MethodBuilder* myMethodBuilder = myTypeBuilder->DefineMethod(S"HelloWorld",
MethodAttributes::Public,
0,
temp1);
Type* temp7 [] = {__typeof(String)};
ctorParams = temp7;
classCtorInfo = __typeof(DateLastUpdated)->GetConstructor(ctorParams);
Object* temp2 [] = {DateTime::Now.ToString()};
CustomAttributeBuilder* myCABuilder2 = new CustomAttributeBuilder(classCtorInfo, temp2);
myMethodBuilder->SetCustomAttribute(myCABuilder2);
ILGenerator* myIL = myMethodBuilder->GetILGenerator();
myIL->EmitWriteLine(S"Hello, world!");
myIL->Emit(OpCodes::Ret);
return myTypeBuilder->CreateType();
}
int main() {
Type* myType = BuildTypeWithCustomAttributesOnMethod();
Object* myInstance = Activator::CreateInstance(myType);
Object* customAttrs[] = myType->GetCustomAttributes(true);
Console::WriteLine(S"Custom Attributes for Type 'MyType':");
Object* attrVal = 0;
System::Collections::IEnumerator* myEnum = customAttrs->GetEnumerator();
while (myEnum->MoveNext()) {
Object* customAttr = __try_cast<Object*>(myEnum->Current);
Object* temp3 [] = new Object*[0];
attrVal = __typeof(ClassCreator)->InvokeMember(S"Creator",
BindingFlags::GetProperty,
0, customAttr, temp3);
Console::WriteLine(S"-- Attribute: [{0} = \"{1}\"]", customAttr, attrVal);
}
Console::WriteLine(S"Custom Attributes for Method 'HelloWorld()' in 'MyType':");
customAttrs = myType->GetMember(S"HelloWorld")[0]->GetCustomAttributes(true);
System::Collections::IEnumerator* myEnum2 = customAttrs->GetEnumerator();
while (myEnum2->MoveNext()) {
Object* customAttr = __try_cast<Object*>(myEnum2->Current);
Object* temp4 [] = new Object*[0];
attrVal = __typeof(DateLastUpdated)->InvokeMember(S"DateUpdated",
BindingFlags::GetProperty,
0, customAttr, temp4);
Console::WriteLine(S"-- Attribute: [{0} = \"{1}\"]", customAttr, attrVal);
}
Console::WriteLine(S"---");
Object* temp5 [] = new Object*[0];
Console::WriteLine(myType->InvokeMember(S"HelloWorld",
BindingFlags::InvokeMethod,
0, myInstance, temp5));
}
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必要条件
名前空間: System.Reflection.Emit
プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ
アセンブリ: Mscorlib (Mscorlib.dll 内)