Type.IsContextfulImpl Método

protected:
 virtual bool IsContextfulImpl();

protected virtual bool IsContextfulImpl();

abstract member IsContextfulImpl : unit -> bool
override this.IsContextfulImpl : unit -> bool

Protected Overridable Function IsContextfulImpl () As Boolean

Retornos

true se puder Type ser hospedado em um contexto; caso contrário, false.

Exemplos

O exemplo a seguir demonstra o uso do IsContextfulImpl método.

using System;
using System.Reflection;
public class MyTypeDelegatorClass : TypeDelegator
{
    public string myElementType = null;
    private Type myType = null ;

    public MyTypeDelegatorClass(Type myType) : base(myType)
    {
        this.myType = myType;
    }
    // Override IsContextfulImpl.
    protected override bool IsContextfulImpl()
    {
        // Check whether the type is contextful.
        if(myType.IsContextful)
        {
            myElementType = " is contextful ";
            return true;
        }
        return false;
    }
}
public class MyTypeDemoClass
{
    public static void Main()
    {
        try
        {
            MyTypeDelegatorClass myType;
            Console.WriteLine ("Check whether MyContextBoundClass can be hosted in a context.");
            // Check whether MyContextBoundClass is contextful.
            myType = new MyTypeDelegatorClass(typeof(MyContextBoundClass));
            if( myType.IsContextful)
            {
                Console.WriteLine(typeof(MyContextBoundClass) + " can be hosted in a context.");
            }
            else
            {
                Console.WriteLine(typeof(MyContextBoundClass) + " cannot be hosted in a context.");
            }
            // Check whether the int type is contextful.
            myType = new MyTypeDelegatorClass(typeof(MyTypeDemoClass));
            Console.WriteLine ("\nCheck whether MyTypeDemoClass can be hosted in a context.");
            if( myType.IsContextful)
            {
                Console.WriteLine(typeof(MyTypeDemoClass) + " can be hosted in a context.");
            }
            else
            {
                Console.WriteLine(typeof(MyTypeDemoClass) + " cannot be hosted in a context.");
            }
        }
        catch( Exception e )
        {
            Console.WriteLine("Exception: {0}", e.Message);
        }
    }
}
// This class demonstrates IsContextfulImpl.
public class MyContextBoundClass : ContextBoundObject
{
    public string myString = "This class is used to demonstrate members of the Type class.";
}

open System
open System.Reflection

type MyTypeDelegatorClass(myType) =
    inherit TypeDelegator(myType) 
    member val myElementType = null with get, set
    
    // Override IsContextfulImpl.
    override this.IsContextfulImpl() = 
        // Check whether the type is contextful.
        if myType.IsContextful then
            this.myElementType <- " is contextful "
            true
        else false

// This class demonstrates IsContextfulImpl.
type MyContextBoundClass() =
    inherit ContextBoundObject()
    let myString = "This class is used to demonstrate members of the Type class."

type MyTypeDemoClass() = class end

try
    printfn "Check whether MyContextBoundClass can be hosted in a context."
    // Check whether MyContextBoundClass is contextful.
    let myType = MyTypeDelegatorClass typeof<MyContextBoundClass>
    if myType.IsContextful then
        printfn $"{typeof<MyContextBoundClass>} can be hosted in a context."
    else
        printfn $"{typeof<MyContextBoundClass>} cannot be hosted in a context."
    // Check whether the int type is contextful.
    let myType = MyTypeDelegatorClass typeof<MyTypeDemoClass>
    printfn "\nCheck whether MyTypeDemoClass can be hosted in a context."
    if myType.IsContextful then
        printfn $"{typeof<MyTypeDemoClass>} can be hosted in a context."
    else
        printfn $"{typeof<MyTypeDemoClass>} cannot be hosted in a context."
with e ->
    printfn $"Exception: {e.Message}"

Imports System.Reflection

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
    ' 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
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
End Class
' 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

Comentários

Esse método pode ser substituído por uma classe derivada.

Um contexto intercepta chamadas para os membros da classe e impõe políticas que são aplicadas à classe, como sincronização.

Confira também

• IsContextful