This topic has not yet been rated - Rate this topic

MethodImplAttribute Class

Silverlight

Other Versions

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.

Inheritance Hierarchy

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

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

Syntax

Copy

[AttributeUsageAttribute(AttributeTargets.Constructor|AttributeTargets.Method, Inherited = false)]
[ComVisibleAttribute(true)]
public sealed class MethodImplAttribute : Attribute

The MethodImplAttribute type exposes the following members.

Constructors

	Name	Description
	MethodImplAttribute()	Initializes a new instance of the MethodImplAttribute class.
	MethodImplAttribute(Int16)	Initializes a new instance of the MethodImplAttribute class with the specified MethodImplOptions value.
	MethodImplAttribute(MethodImplOptions)	Initializes a new instance of the MethodImplAttribute class with the specified MethodImplOptions value.

Top

Properties

	Name	Description
	Value	Gets the MethodImplOptions value describing the attributed method.

Top

Methods

	Name	Description
	Equals	Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Returns the hash code for this instance. (Inherited from Attribute.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	Match	When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

Top

Fields

	Name	Description
	MethodCodeType	A MethodCodeType value indicating what kind of implementation is provided for this method.

Top

Remarks

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.

Examples

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.

Copy


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", "");
   }
}

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.

Copy


using System;
using System.Reflection;

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      // Use reflection to get a reference to the GetCalendarName method.
      Assembly assem = Assembly.GetExecutingAssembly();
      Type type = assem.GetType("Utility");
      MethodInfo methodInfo = type.GetMethod("GetCalendarName");

      // Determine whether the method has any custom attributes.
      outputBlock.Text += "Utility.GetCalendarName custom attributes:";
      object[] attribs = methodInfo.GetCustomAttributes(false);
      if (attribs.Length > 0)
      {
         outputBlock.Text += "\n";
         foreach (var attrib in attribs)
            outputBlock.Text += "   " + attrib.ToString() + "\n";

      }
      else
      {
         outputBlock.Text += "   <None>" + "\n";
      }

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