MethodImplAttribute Class
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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
'Declaration
<AttributeUsageAttribute(AttributeTargets.Constructor Or AttributeTargets.Method, Inherited := False)> _
<ComVisibleAttribute(True)> _
Public NotInheritable Class MethodImplAttribute _
Inherits Attribute
[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. |
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Properties
Name | Description | |
---|---|---|
Value | Gets the MethodImplOptions value describing the attributed method. |
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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.) |
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Fields
Name | Description | |
---|---|---|
MethodCodeType | A MethodCodeType value indicating what kind of implementation is provided for this method. |
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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.
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
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.
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
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
Version Information
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
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.
Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
See Also
Reference
Change History
Date |
History |
Reason |
---|---|---|
October 2010 |
Revised extensively. |
Customer feedback. |