아티클
11/18/2011

MethodBase.IsFamilyOrAssembly Property

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Gets a value that indicates whether the potential visibility of this method or constructor is described by MethodAttributes.FamORAssem; that is, the method or constructor can be called by derived classes wherever they are, and by classes in the same assembly.

Namespace: System.Reflection
Assembly: mscorlib (in mscorlib.dll)

Syntax

'Declaration
Public ReadOnly Property IsFamilyOrAssembly As Boolean

public bool IsFamilyOrAssembly { get; }

Property Value

Type: System.Boolean
true if access to this method or constructor is exactly described by MethodAttributes.FamORAssem; otherwise, false.

Remarks

If a type member has MethodAttributes.FamORAssem visibility, it can be called from any member in a derived class or any member in the same assembly, but not from any other type.

The actual visibility of a method is limited by the visibility of its type. The IsFamilyOrAssembly property might be true for a method, but if it is a method of a private nested type, the method is not visible outside the containing type.

The visibility of a method or constructor is exactly described by MethodAttributes.FamORAssem if the visibility modifier is protected internal in C# (Protected Friend in Visual Basic, protected public in C++).

Examples

The following example defines methods with varying levels of visibility, and displays the values of their IsAssembly, IsFamily, IsFamilyOrAssembly, and IsFamilyAndAssembly properties.

Note:
The Visual Basic and C# languages cannot define methods with MethodAttributes.FamANDAssem visibility.

To run this example, see Building Examples That Use a Demo Method and a TextBlock Control.

Imports System.Reflection

Public Class Example

   Public Sub m_Public()
   End Sub
   Friend Sub m_Friend()
   End Sub
   Protected Sub m_Protected()
   End Sub
   Protected Friend Sub m_Protected_Friend()
   End Sub

   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)

      outputBlock.FontFamily = New FontFamily("Courier New")
      outputBlock.Text &= String.Format(vbCrLf & _
          "{0,-30}{1,-18}{2}", "", "IsAssembly", "IsFamilyOrAssembly") & vbCrLf
      outputBlock.Text &= String.Format("{0,-21}{1,-18}{2,-18}{3}" & vbCrLf, _
          "", "IsPublic", "IsFamily", "IsFamilyAndAssembly") & vbCrLf

      For Each m As MethodBase In GetType(Example).GetMethods( _
          BindingFlags.Instance Or BindingFlags.NonPublic Or BindingFlags.Public)

         If Left(m.Name, 1) = "m" Then

            outputBlock.Text &= String.Format("{0,-21}{1,-9}{2,-9}{3,-9}{4,-9}{5,-9}", _
                m.Name, _
                m.IsPublic, _
                m.IsAssembly, _
                m.IsFamily, _
                m.IsFamilyOrAssembly, _
                m.IsFamilyAndAssembly _
            ) & vbCrLf
         End If
      Next
   End Sub
End Class

' This code example produces output similar to the following:
'
'                              IsAssembly        IsFamilyOrAssembly
'                     IsPublic          IsFamily          IsFamilyAndAssembly
'
'm_Public             True     False    False    False    False
'm_Friend             False    True     False    False    False
'm_Protected          False    False    True     False    False
'm_Protected_Friend   False    False    False    True     False

using System;
using System.Reflection;
using System.Windows.Media;

public class Example
{
   public void m_public() { }
   internal void m_internal() { }
   protected void m_protected() { }
   protected internal void m_protected_public() { }

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      outputBlock.FontFamily = new FontFamily("Courier New");
      outputBlock.Text += String.Format("\n{0,-30}{1,-18}{2}", "", "IsAssembly", "IsFamilyOrAssembly") + "\n";
      outputBlock.Text += String.Format("{0,-21}{1,-18}{2,-18}{3}\n",
          "", "IsPublic", "IsFamily", "IsFamilyAndAssembly") + "\n";

      foreach (MethodBase m in typeof(Example).GetMethods(
          BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public))
      {
         if (m.Name.Substring(0, 1) == "m")
         {
            outputBlock.Text += String.Format("{0,-21}{1,-9}{2,-9}{3,-9}{4,-9}{5,-9}",
                m.Name,
                m.IsPublic,
                m.IsAssembly,
                m.IsFamily,
                m.IsFamilyOrAssembly,
                m.IsFamilyAndAssembly
            ) + "\n";
         }
      }
   }
}

/* This code example produces output similar to the following:

                              IsAssembly        IsFamilyOrAssembly
                     IsPublic          IsFamily          IsFamilyAndAssembly

m_public             True     False    False    False    False
m_internal           False    True     False    False    False
m_protected          False    False    True     False    False
m_protected_public   False    False    False    True     False
 */

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.

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