This documentation is archived and is not being maintained.

Type.IsContextfulImpl Method

Implements the IsContextful property and determines whether the Type can be hosted in a context.

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

'Declaration
Protected Overridable Function IsContextfulImpl As Boolean

Return Value

Type: System.Boolean
true if the Type can be hosted in a context; otherwise, false.

This method can be overridden by a derived class.

A context intercepts calls to the class members and enforce policies that are applied to the class, such as synchronization.

The following example demonstrates a use of the IsContextfulImpl method.


Imports System
Imports System.Reflection
Imports Microsoft.VisualBasic
Public Class MyTypeDelegatorClass
    Inherits TypeDelegator
    Public myElementType As String = Nothing
    Private myType As Type = Nothing
    Public Sub New(ByVal myType As Type)
        MyBase.New(myType)
        Me.myType = myType
    End Sub 'New
    ' Override IsContextfulImpl.
    Protected Overrides Function IsContextfulImpl() As Boolean
        ' Check whether the type is contextful.
        If myType.IsContextful Then
            myElementType = " is contextful "
            Return True
        End If
        Return False
    End Function 'IsContextfulImpl
End Class 'MyTypeDelegatorClass
Public Class MyTypeDemoClass
    Public Shared Sub Main()
        Try
            Dim myType As MyTypeDelegatorClass
            Console.WriteLine("Check whether MyContextBoundClass can be hosted in a context.")
            ' Check whether MyContextBoundClass is contextful.
            myType = New MyTypeDelegatorClass(GetType(MyContextBoundClass))
            If myType.IsContextful Then
                Console.WriteLine(GetType(MyContextBoundClass).ToString() + " can be hosted in a context.")
            Else
                Console.WriteLine(GetType(MyContextBoundClass).ToString() + " cannot be hosted in a context.")
            End If
            ' Check whether the int type is contextful.
            myType = New MyTypeDelegatorClass(GetType(MyTypeDemoClass))
            Console.WriteLine(ControlChars.NewLine + "Check whether MyTypeDemoClass can be hosted in a context.")
            If myType.IsContextful Then
                Console.WriteLine(GetType(MyTypeDemoClass).ToString() + " can be hosted in a context.")
            Else
                Console.WriteLine(GetType(MyTypeDemoClass).ToString() + " cannot be hosted in a context.")
            End If
        Catch e As Exception
            Console.WriteLine("Exception: {0}", e.Message.ToString())
        End Try
    End Sub 'Main
End Class 'MyTypeDemoClass
' This class demonstrates the IsContextfulImpl method.
Public Class MyContextBoundClass
    Inherits ContextBoundObject
    Public myString As String = "This class is used to demonstrate members of the Type class."
End Class 'MyContextBoundClass


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Show: