LogicalMethodInfo.GetCustomAttribute(Type) Metodo

Riferimento

Definizione

Spazio dei nomi:: System.Web.Services.Protocols

Assembly:: System.Web.Services.dll

Importante

Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.

Restituisce il primo attributo personalizzato applicato al tipo, se vi sono attributi personalizzati applicati al tipo.

public:
 System::Object ^ GetCustomAttribute(Type ^ type);

public object GetCustomAttribute (Type type);

member this.GetCustomAttribute : Type -> obj

Public Function GetCustomAttribute (type As Type) As Object

Parametri

type: Type

Oggetto Type al quale vengono applicati gli attributi personalizzati.

Restituisce

Object

Oggetto Object contenente il primo attributo personalizzato applicato al parametro type.

Eccezioni

TypeLoadException

Il tipo di attributo personalizzato non può essere caricato.

Esempio

#using <System.Web.Services.dll>

using namespace System;
using namespace System::Reflection;
using namespace System::Web::Services::Protocols;

// Define a custom attribute with one named parameter.

[AttributeUsage(AttributeTargets::Method|AttributeTargets::ReturnValue,
AllowMultiple=true)]
public ref class MyAttribute: public Attribute
{
private:
   String^ myName;

public:
   MyAttribute( String^ name )
   {
      myName = name;
   }

   property String^ Name 
   {
      String^ get()
      {
         return myName;
      }
   }
};

public ref class MyService
{
public:

   [MyAttribute("This is the first sample attribute")]
   [MyAttribute("This is the second sample attribute")]
   [returnvalue:MyAttribute("This is the return sample attribute")]
   int Add( int xValue, int yValue )
   {
      return (xValue + yValue);
   }
};

int main()
{
   Type^ myType = MyService::typeid;
   MethodInfo^ myMethodInfo = myType->GetMethod( "Add" );

   // Create a synchronous 'LogicalMethodInfo' instance.
   array<MethodInfo^>^temparray = {myMethodInfo};
   LogicalMethodInfo^ myLogicalMethodInfo = (LogicalMethodInfo::Create( temparray, LogicalMethodTypes::Sync ))[ 0 ];

   // Display the method for which the attributes are being displayed.
   Console::WriteLine( "\nDisplaying the attributes for the method : {0}\n", myLogicalMethodInfo->MethodInfo );

   // Displaying a custom attribute of type 'MyAttribute'
   Console::WriteLine( "\nDisplaying attribute of type 'MyAttribute'\n" );
   Object^ attribute = myLogicalMethodInfo->GetCustomAttribute( MyAttribute::typeid );
   Console::WriteLine( (dynamic_cast<MyAttribute^>(attribute))->Name );

   // Display all custom attribute of type 'MyAttribute'.
   Console::WriteLine( "\nDisplaying all attributes of type 'MyAttribute'\n" );
   array<Object^>^attributes = myLogicalMethodInfo->GetCustomAttributes( MyAttribute::typeid );
   for ( int i = 0; i < attributes->Length; i++ )
      Console::WriteLine( (dynamic_cast<MyAttribute^>(attributes[ i ]))->Name );

   // Display all return attributes of type 'MyAttribute'.
   Console::WriteLine( "\nDisplaying all return attributes of type 'MyAttribute'\n" );
   ICustomAttributeProvider^ myCustomAttributeProvider = myLogicalMethodInfo->ReturnTypeCustomAttributeProvider;
   if ( myCustomAttributeProvider->IsDefined( MyAttribute::typeid, true ) )
   {
      attributes = myCustomAttributeProvider->GetCustomAttributes( true );
      for ( int i = 0; i < attributes->Length; i++ )
         if ( attributes[ i ]->GetType()->Equals( MyAttribute::typeid ) )
                  Console::WriteLine( (dynamic_cast<MyAttribute^>(attributes[ i ]))->Name );
   }

   // Display all the custom attributes of type 'MyAttribute'.
   Console::WriteLine( "\nDisplaying all attributes of type 'MyAttribute'\n" );
   myCustomAttributeProvider = myLogicalMethodInfo->CustomAttributeProvider;
   if ( myCustomAttributeProvider->IsDefined( MyAttribute::typeid, true ) )
   {
      attributes = myCustomAttributeProvider->GetCustomAttributes( true );
      for ( int i = 0; i < attributes->Length; i++ )
         if ( attributes[ i ]->GetType()->Equals( MyAttribute::typeid ) )
                  Console::WriteLine( (dynamic_cast<MyAttribute^>(attributes[ i ]))->Name );
   }
}

using System;
using System.Reflection;
using System.Web.Services.Protocols;

// Define a custom attribute with one named parameter.
[AttributeUsage(AttributeTargets.Method | AttributeTargets.ReturnValue, AllowMultiple=true)]
public class MyAttribute : Attribute
{
   private string myName;
   public MyAttribute(string name)
   {
      myName = name;
   }
   public string Name
   {
      get
      {
         return myName;
      }
   }
}

public class MyService
{
   [MyAttribute("This is the first sample attribute")]
   [MyAttribute("This is the second sample attribute")]
   [return: MyAttribute("This is the return sample attribute")]
   public int Add(int xValue, int yValue)
   {
      return (xValue + yValue);
   }
}

public class LogicalMethodInfo_GetCustomAttribute
{
   public static void Main()
   {
      Type myType = typeof(MyService);
      MethodInfo myMethodInfo = myType.GetMethod("Add");
      // Create a synchronous 'LogicalMethodInfo' instance.
      LogicalMethodInfo myLogicalMethodInfo =
         (LogicalMethodInfo.Create(new MethodInfo[] {myMethodInfo},
                                   LogicalMethodTypes.Sync))[0];
      // Display the method for which the attributes are being displayed.
      Console.WriteLine("\nDisplaying the attributes for the method : {0}\n",
                           myLogicalMethodInfo.MethodInfo);

      // Displaying a custom attribute of type 'MyAttribute'
      Console.WriteLine("\nDisplaying attribute of type 'MyAttribute'\n");
      object attribute = myLogicalMethodInfo.GetCustomAttribute(typeof(MyAttribute));
      Console.WriteLine(((MyAttribute)attribute).Name);

      // Display all custom attribute of type 'MyAttribute'.
      Console.WriteLine("\nDisplaying all attributes of type 'MyAttribute'\n");
      object[] attributes = myLogicalMethodInfo.GetCustomAttributes(typeof(MyAttribute));
      for(int i = 0; i < attributes.Length; i++)
         Console.WriteLine(((MyAttribute)attributes[i]).Name);

      // Display all return attributes of type 'MyAttribute'.
      Console.WriteLine("\nDisplaying all return attributes of type 'MyAttribute'\n");
      ICustomAttributeProvider myCustomAttributeProvider =
                  myLogicalMethodInfo.ReturnTypeCustomAttributeProvider;
      if(myCustomAttributeProvider.IsDefined(typeof(MyAttribute), true))
      {
         attributes = myCustomAttributeProvider.GetCustomAttributes(true);
         for(int i = 0; i < attributes.Length; i++)
            if(attributes[i].GetType().Equals(typeof(MyAttribute)))
               Console.WriteLine(((MyAttribute)attributes[i]).Name);
      }

      // Display all the custom attributes of type 'MyAttribute'.
      Console.WriteLine("\nDisplaying all attributes of type 'MyAttribute'\n");
      myCustomAttributeProvider = myLogicalMethodInfo.CustomAttributeProvider;
      if(myCustomAttributeProvider.IsDefined(typeof(MyAttribute), true))
      {
         attributes = myCustomAttributeProvider.GetCustomAttributes(true);
         for(int i = 0; i < attributes.Length; i++)
            if(attributes[i].GetType().Equals(typeof(MyAttribute)))
               Console.WriteLine(((MyAttribute)attributes[i]).Name);
      }
   }
}

Imports System.Reflection
Imports System.Web.Services.Protocols

' Define a custom attribute with one named parameter.
<AttributeUsage(AttributeTargets.Method Or AttributeTargets.ReturnValue, AllowMultiple := True)>  _
Public Class MyAttribute
   Inherits Attribute

   Private myName As String
   
   Public Sub New(name As String)
      myName = name
   End Sub
   
   Public ReadOnly Property Name() As String
      Get
         Return myName
      End Get
   End Property
End Class

Public Class MyService
   
<MyAttribute("This is the first sample attribute"), MyAttribute("This is the second sample attribute")>  _
   Public Function Add(xValue As Integer, yValue As Integer)  _
                 As<MyAttribute("This is the return sample attribute")> Integer
      Return xValue + yValue
   End Function 'Add
End Class


Public Class LogicalMethodInfo_GetCustomAttribute
   
   Public Shared Sub Main()
      Dim myType As Type = GetType(MyService)
      Dim myMethodInfo As MethodInfo = myType.GetMethod("Add")
      ' Create a synchronous 'LogicalMethodInfo' instance.
      Dim myLogicalMethodInfo As LogicalMethodInfo = _
                 LogicalMethodInfo.Create(New MethodInfo() {myMethodInfo}, LogicalMethodTypes.Sync)(0)
      ' Display the method for which the attributes are being displayed.
      Console.WriteLine(ControlChars.NewLine + "Displaying the attributes for the method : {0}" + _
                 ControlChars.NewLine, myLogicalMethodInfo.MethodInfo.ToString())
      
      ' Displaying a custom attribute of type 'MyAttribute'
      Console.WriteLine(ControlChars.NewLine + "Displaying attribute of type 'MyAttribute'" + _
                 ControlChars.NewLine)
      Dim attribute As Object = myLogicalMethodInfo.GetCustomAttribute(GetType(MyAttribute))
      Console.WriteLine(CType(attribute, MyAttribute).Name)
      
      ' Display all custom attribute of type 'MyAttribute'.
      Console.WriteLine(ControlChars.NewLine + "Displaying all attributes of type 'MyAttribute'" + _
                 ControlChars.NewLine)
      Dim attributes As Object() = myLogicalMethodInfo.GetCustomAttributes(GetType(MyAttribute))
      Dim i As Integer
      For i = 0 To attributes.Length - 1
         Console.WriteLine(CType(attributes(i), MyAttribute).Name)
      Next i 
      ' Display all return attributes of type 'MyAttribute'.
      Console.WriteLine(ControlChars.NewLine + "Displaying all return attributes of type 'MyAttribute'" + _
                 ControlChars.NewLine)
      Dim myCustomAttributeProvider As ICustomAttributeProvider = _
                 myLogicalMethodInfo.ReturnTypeCustomAttributeProvider
      If myCustomAttributeProvider.IsDefined(GetType(MyAttribute), True) Then
         attributes = myCustomAttributeProvider.GetCustomAttributes(True)

         For i = 0 To attributes.Length - 1
            If attributes(i).GetType().Equals(GetType(MyAttribute)) Then
               Console.WriteLine(CType(attributes(i), MyAttribute).Name)
            End If
         Next i 
      End If ' Display all the custom attributes of type 'MyAttribute'.
      Console.WriteLine(ControlChars.NewLine + "Displaying all attributes of type 'MyAttribute'" + _
                 ControlChars.NewLine)
      myCustomAttributeProvider = myLogicalMethodInfo.CustomAttributeProvider
      If myCustomAttributeProvider.IsDefined(GetType(MyAttribute), True) Then
         attributes = myCustomAttributeProvider.GetCustomAttributes(True)

         For i = 0 To attributes.Length - 1
            If attributes(i).GetType().Equals(GetType(MyAttribute)) Then
               Console.WriteLine(CType(attributes(i), MyAttribute).Name)
            End If
         Next i
      End If
   End Sub
End Class

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