IsFamilyOrAssembly Property

MethodBase.IsFamilyOrAssembly Property

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)

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.

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++).

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


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.

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}",
            ) + "\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


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.

Community Additions

© 2015 Microsoft