MethodImplAttribute Klas

Definitie

public ref class MethodImplAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Constructor | System.AttributeTargets.Method, Inherited=false)]
public sealed class MethodImplAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Constructor | System.AttributeTargets.Method, Inherited=false)]
[System.Serializable]
public sealed class MethodImplAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Constructor | System.AttributeTargets.Method, Inherited=false)]
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class MethodImplAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Constructor | System.AttributeTargets.Method, Inherited=false)>]
type MethodImplAttribute = class
    inherit Attribute

[<System.AttributeUsage(System.AttributeTargets.Constructor | System.AttributeTargets.Method, Inherited=false)>]
[<System.Serializable>]
type MethodImplAttribute = class
    inherit Attribute

[<System.AttributeUsage(System.AttributeTargets.Constructor | System.AttributeTargets.Method, Inherited=false)>]
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type MethodImplAttribute = class
    inherit Attribute

Public NotInheritable Class MethodImplAttribute
Inherits Attribute

Overname

Object

Attribute

MethodImplAttribute

Kenmerken

AttributeUsageAttribute SerializableAttribute ComVisibleAttribute

Voorbeelden

In het volgende voorbeeld wordt de MethodImplAttributeGetCalendarName methode toegepast om ervoor te zorgen dat deze niet inline is tijdens runtime door de Just-In-Time-compiler (JIT).

using System;
using System.Globalization;
using System.Runtime.CompilerServices;

public class Utility
{
   [MethodImplAttribute(MethodImplOptions.NoInlining)] 
   public static string GetCalendarName(Calendar cal)
   {
      return cal.ToString().Replace("System.Globalization.", "").
                 Replace("Calendar", "");
   }
}

Imports System.Globalization
Imports System.Runtime.CompilerServices

Public Class Utility
   <MethodImplAttribute(MethodImplOptions.NoInlining)>
   Public Shared Function GetCalendarName(cal As Calendar) As String
      Return cal.ToString().Replace("System.Globalization.", "").Replace("Calendar", "")
   End Function
End Class

In het volgende voorbeeld wordt vervolgens de MethodInfo.GetMethodImplementationFlags methode aangeroepen om te bepalen welke vlaggen voor de GetCalendarName methode zijn ingesteld. Ook wordt gedemonstreerd dat deze informatie niet door de MemberInfo.GetCustomAttributes methode wordt opgehaald.

using System;
using System.Reflection;

public class Example
{
   public static void Main()
   {
      // Use reflection to get a reference to the GetCalendarName method.
      Assembly assem = Assembly.LoadFrom(@".\Example.dll");
      Type type = assem.GetType("Utility");
      MethodInfo methodInfo = type.GetMethod("GetCalendarName");
      
      // Determine whether the method has any custom attributes.
      Console.Write("Utility.GetCalendarName custom attributes:");
      object[] attribs = methodInfo.GetCustomAttributes(false);
      if (attribs.Length > 0) {
         Console.WriteLine();
         foreach (var attrib in attribs)
            Console.WriteLine("   " + attrib.ToString());   
      }
      else {
         Console.WriteLine("   <None>");
      }

      // Get the method's metadata flags.
      MethodImplAttributes flags = methodInfo.GetMethodImplementationFlags();
      Console.WriteLine("Utility.GetCalendarName flags: {0}", 
                        flags.ToString());      
   }
}
// The example displays the following output:
//     Utility.GetCalendarName custom attributes:   <None>
//     Utility.GetCalendarName flags: NoInlining

Imports System.Reflection

Module Example
   Public Sub Main()
      ' Use reflection to get a reference to the GetCalendarName method.
      Dim assem As Assembly = Assembly.LoadFrom(".\Example.dll")
      Dim type As Type = assem.GetType("Utility")
      Dim methodInfo As MethodInfo = type.GetMethod("GetCalendarName")
      
      ' Determine whether the method has any custom attributes.
      Console.Write("Utility.GetCalendarName custom attributes:")
      Dim attribs() As Object = methodInfo.GetCustomAttributes(False)
      If attribs.Length > 0 Then
         Console.WriteLine()
         For Each attrib As Object In attribs
            Console.WriteLine("   " + attrib.ToString())   
         Next
      Else
         Console.WriteLine("   <None>")
      End If

      ' Get the method's metadata flags.
      Dim flags As MethodImplAttributes = methodInfo.GetMethodImplementationFlags()
      Console.WriteLine("Utility.GetCalendarName flags: {0}", flags.ToString())      
   End Sub
End Module
' The example displays the following output:
'     Utility.GetCalendarName custom attributes:   <None>
'     Utility.GetCalendarName flags: NoInlining

Opmerkingen

U kunt dit kenmerk toepassen op methoden of constructors.

Met dit kenmerk kunt u de configuratie van de methode of constructor waarop deze van toepassing is aanpassen door een MethodImplOptions waarde op te geven aan de klasseconstructor. De leden van de MethodImplOptions opsomming komen overeen met bitvelden in de CorMethodImpl metagegevenstabel. Dit betekent dat informatie over het kenmerk niet tijdens runtime kan worden opgehaald door de MemberInfo.GetCustomAttributes methode aan te roepen. In plaats daarvan wordt deze opgehaald door de MethodInfo.GetMethodImplementationFlags of de ConstructorInfo.GetMethodImplementationFlags methode aan te roepen.

Zie ook

• GetMethodImplementationFlags()