MethodImplAttribute Class
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MethodImplAttribute Class

Updated: October 2010

This API supports the .NET Framework infrastructure and is not intended to be used directly from your code.

Specifies the details of how a method is implemented. This class cannot be inherited.

System.Object
  System.Attribute
    System.Runtime.CompilerServices.MethodImplAttribute

Namespace:  System.Runtime.CompilerServices
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
<AttributeUsageAttribute(AttributeTargets.Constructor Or AttributeTargets.Method, Inherited := False)> _
<ComVisibleAttribute(True)> _
Public NotInheritable Class MethodImplAttribute _
	Inherits Attribute

The MethodImplAttribute type exposes the following members.

  NameDescription
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360MethodImplAttributeInitializes a new instance of the MethodImplAttribute class.
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360MethodImplAttribute(Int16)Initializes a new instance of the MethodImplAttribute class with the specified MethodImplOptions value.
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360MethodImplAttribute(MethodImplOptions)Initializes a new instance of the MethodImplAttribute class with the specified MethodImplOptions value.
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  NameDescription
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360ValueGets the MethodImplOptions value describing the attributed method.
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  NameDescription
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360EqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Protected methodSupported by Silverlight for Windows PhoneSupported by Xbox 360FinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360MatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Protected methodSupported by Silverlight for Windows PhoneSupported by Xbox 360MemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360ToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Public fieldSupported by Silverlight for Windows PhoneSupported by Xbox 360MethodCodeTypeA MethodCodeType value indicating what kind of implementation is provided for this method.
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You can apply this attribute to methods or constructors.

This attribute lets you customize the configuration of the method or constructor to which it applies by supplying a MethodImplOptions value to its class constructor. The members of the MethodImplOptions enumeration correspond to bit fields in the CorMethodImpl metadata table. This means that information on the attribute cannot be retrieved at run time by calling the MemberInfo.GetCustomAttributes method; instead, it is retrieved by calling either the MethodInfo.GetMethodImplementationFlags or the ConstructorInfo.GetMethodImplementationFlags method.

The following example applies the MethodImplAttribute to the GetCalendarName method to ensure that it is not inlined at run time by the just-in-time (JIT) compiler.


Imports System.Globalization
Imports System.Runtime.CompilerServices

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


The following example then calls the MethodInfo.GetMethodImplementationFlags method to determine which flags are set for the GetCalendarName method. It also demonstrates that this information is not retrieved by the MemberInfo.GetCustomAttributes method.


Imports System.Reflection

Module Example
   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      ' Use reflection to get a reference to the GetCalendarName method.
      Dim assem As Assembly = Assembly.GetExecutingAssembly()
      Dim type As Type = assem.GetType("SilverlightApplication.Utility")
      Dim methodInfo As MethodInfo = type.GetMethod("GetCalendarName")

      ' Determine whether the method has any custom attributes.
      outputBlock.Text &= "Utility.GetCalendarName custom attributes:"
      Dim attribs() As Object = methodInfo.GetCustomAttributes(False)
      If attribs.Length > 0 Then
         outputBlock.Text &= vbCrLf
         For Each attrib As Object In attribs
            outputBlock.Text &= "   " + attrib.ToString() & vbCrLf
         Next
      Else
         outputBlock.Text &= "   <None>" & vbCrLf
      End If

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


Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Date

History

Reason

October 2010

Revised extensively.

Customer feedback.

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