AssemblyBuilder.SetCustomAttribute Metodo

public:
 void SetCustomAttribute(System::Reflection::Emit::CustomAttributeBuilder ^ customBuilder);

public void SetCustomAttribute(System.Reflection.Emit.CustomAttributeBuilder customBuilder);

member this.SetCustomAttribute : System.Reflection.Emit.CustomAttributeBuilder -> unit

Public Sub SetCustomAttribute (customBuilder As CustomAttributeBuilder)

Parametri

Eccezioni

Esempio

Nell'esempio di codice seguente viene illustrato l'uso di all'interno AssemblyBuilderdi SetCustomAttribute , usando un oggetto CustomAttributeBuilder.

[AttributeUsage(AttributeTargets.All, AllowMultiple = false)]
public class MyAttribute : Attribute
{
   public String s;
   public int x;

   public MyAttribute(String s, int x)
   {
      this.s = s;
      this.x = x;
   }
}

class MyApplication
{
   public static void Main()
   {
      Type customAttribute = CreateCallee(Thread.GetDomain());
      object[] attributes = customAttribute.Assembly.GetCustomAttributes(true);
      Console.WriteLine("MyAttribute custom attribute contains : ");
      for(int index=0; index < attributes.Length; index++)
      {
         if(attributes[index] is MyAttribute)
         {
            Console.WriteLine("s : " + ((MyAttribute)attributes[index]).s);
            Console.WriteLine("x : " + ((MyAttribute)attributes[index]).x);
            break;
         }
      }
   }

   private static Type CreateCallee(AppDomain domain)
   {
      AssemblyName myAssemblyName = new AssemblyName();
      myAssemblyName.Name = "EmittedAssembly";
      AssemblyBuilder myAssembly = domain.DefineDynamicAssembly(myAssemblyName,
         AssemblyBuilderAccess.Run);
      Type myType = typeof(MyAttribute);
      ConstructorInfo infoConstructor = myType.GetConstructor(new Type[2]{typeof(String), typeof(int)});
      CustomAttributeBuilder attributeBuilder =
         new CustomAttributeBuilder(infoConstructor, new object[2]{"Hello", 2});
      myAssembly.SetCustomAttribute(attributeBuilder);
      ModuleBuilder myModule = myAssembly.DefineDynamicModule("EmittedModule");
      // Define a public class named "HelloWorld" in the assembly.
      TypeBuilder helloWorldClass = myModule.DefineType("HelloWorld", TypeAttributes.Public);

      return(helloWorldClass.CreateType());
  }
}

<AttributeUsage(AttributeTargets.All, AllowMultiple := False)>  _
Public Class MyAttribute
   Inherits Attribute
   Public s As String
   Public x As Integer

   Public Sub New(s As String, x As Integer)
      Me.s = s
      Me.x = x
   End Sub
End Class

Class MyApplication
   Public Shared Sub Main()
      Dim customAttribute As Type = CreateCallee(Thread.GetDomain())
      Dim attributes As Object() = customAttribute.Assembly.GetCustomAttributes(True)
      Console.WriteLine("MyAttribute custom attribute contains : ")
      Dim index As Integer
      For index = 0 To attributes.Length - 1
         If TypeOf attributes(index) Is MyAttribute Then
            Console.WriteLine("s : " + CType(attributes(index), MyAttribute).s)
            Console.WriteLine("x : " + CType(attributes(index), MyAttribute).x.ToString())
            Exit For
         End If
      Next index
   End Sub

   Private Shared Function CreateCallee(domain As AppDomain) As Type
      Dim myAssemblyName As New AssemblyName()
      myAssemblyName.Name = "EmittedAssembly"
      Dim myAssembly As AssemblyBuilder = _
                     domain.DefineDynamicAssembly(myAssemblyName, AssemblyBuilderAccess.Run)
      Dim myType As Type = GetType(MyAttribute)
      Dim infoConstructor As ConstructorInfo = _
                     myType.GetConstructor(New Type(1) {GetType(String), GetType(Integer)})
      Dim attributeBuilder As New CustomAttributeBuilder(infoConstructor, New Object(1) {"Hello", 2})
      myAssembly.SetCustomAttribute(attributeBuilder)
      Dim myModule As ModuleBuilder = myAssembly.DefineDynamicModule("EmittedModule")
      ' Define a public class named "HelloWorld" in the assembly.
      Dim helloWorldClass As TypeBuilder = myModule.DefineType("HelloWorld", TypeAttributes.Public)
      Return helloWorldClass.CreateType()
   End Function 'CreateCallee
End Class

Commenti

public:
 void SetCustomAttribute(System::Reflection::ConstructorInfo ^ con, cli::array <System::Byte> ^ binaryAttribute);

public void SetCustomAttribute(System.Reflection.ConstructorInfo con, byte[] binaryAttribute);

[System.Runtime.InteropServices.ComVisible(true)]
public void SetCustomAttribute(System.Reflection.ConstructorInfo con, byte[] binaryAttribute);

member this.SetCustomAttribute : System.Reflection.ConstructorInfo * byte[] -> unit

[<System.Runtime.InteropServices.ComVisible(true)>]
member this.SetCustomAttribute : System.Reflection.ConstructorInfo * byte[] -> unit

Public Sub SetCustomAttribute (con As ConstructorInfo, binaryAttribute As Byte())

Parametri

Attributi

ComVisibleAttribute

Eccezioni

Esempio

Nell'esempio di codice seguente viene illustrato l'uso di SetCustomAttribute per associare un attributo personalizzato a un assembly generato in modo dinamico.

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

[AttributeUsage(AttributeTargets.All, AllowMultiple = false)]
public class MyAttribute : Attribute
{
   public bool s;

   public MyAttribute(bool s)
   {
      this.s = s;
   }
}

class MyApplication
{
   public static void Main()
   {
      Type customAttribute = CreateCallee(Thread.GetDomain());
      object[] attributes = customAttribute.Assembly.GetCustomAttributes(true);
      Console.WriteLine("MyAttribute custom attribute contains : ");
      for(int index=0; index < attributes.Length; index++)
      {
         if(attributes[index] is MyAttribute)
         {
            Console.WriteLine("s : " + ((MyAttribute)attributes[index]).s);
            break;
         }
      }
   }

   private static Type CreateCallee(AppDomain domain)
   {
      AssemblyName myAssemblyName = new AssemblyName();
      myAssemblyName.Name = "EmittedAssembly";
      AssemblyBuilder myAssembly = domain.DefineDynamicAssembly(myAssemblyName,
         AssemblyBuilderAccess.Run);
      Type myType = typeof(MyAttribute);
      ConstructorInfo infoConstructor = myType.GetConstructor(new Type[]{typeof(bool)});
      myAssembly.SetCustomAttribute(infoConstructor, new byte[]{01,00,01});
      ModuleBuilder myModule = myAssembly.DefineDynamicModule("EmittedModule");
      // Define a public class named "HelloWorld" in the assembly.
      TypeBuilder helloWorldClass = myModule.DefineType("HelloWorld", TypeAttributes.Public);

      return(helloWorldClass.CreateType());
  }
}

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


<AttributeUsage(AttributeTargets.All, AllowMultiple := False)>  _
Public Class MyAttribute
   Inherits Attribute
   Public s As Boolean
   
   Public Sub New(s As Boolean)
      Me.s = s
   End Sub
End Class

Class MyApplication
   
   Public Shared Sub Main()
      Dim customAttribute As Type = CreateCallee(Thread.GetDomain())
      Dim attributes As Object() = customAttribute.Assembly.GetCustomAttributes(True)
      Console.WriteLine("MyAttribute custom attribute contains : ")
      Dim index As Integer
      For index = 0 To attributes.Length - 1
         If TypeOf attributes(index) Is MyAttribute Then
            Console.WriteLine("s : " + CType(attributes(index), MyAttribute).s.ToString())
            Exit For
         End If
      Next index
   End Sub
   
   Private Shared Function CreateCallee(domain As AppDomain) As Type
      Dim myAssemblyName As New AssemblyName()
      myAssemblyName.Name = "EmittedAssembly"
      Dim myAssembly As AssemblyBuilder = domain.DefineDynamicAssembly(myAssemblyName, _
                                                            AssemblyBuilderAccess.Run)
      Dim myType As Type = GetType(MyAttribute)
      Dim infoConstructor As ConstructorInfo = myType.GetConstructor(New Type() {GetType(Boolean)})
      myAssembly.SetCustomAttribute(infoConstructor, New Byte() {01, 00, 01})
      Dim myModule As ModuleBuilder = myAssembly.DefineDynamicModule("EmittedModule")
      ' Define a public class named "HelloWorld" in the assembly.
      Dim helloWorldClass As TypeBuilder = myModule.DefineType("HelloWorld", TypeAttributes.Public)
      
      Return helloWorldClass.CreateType()
   End Function 'CreateCallee
End Class

Commenti

Per informazioni su come formattare binaryAttribute, vedere la specifica dei metadati in Partition II della specifica Common Language Infrastructure (CLI).

RuntimeConstructorInfo è un tipo speciale generato dal sistema. Deriva dalla ConstructorInfo classe e qualsiasi ConstructorInfo oggetto ottenuto tramite reflection è in realtà un'istanza di RuntimeConstructorInfo.