ConfigurationElement.IsModified Método

protected:
 virtual bool IsModified();

protected public:
 virtual bool IsModified();

protected virtual bool IsModified ();

protected internal virtual bool IsModified ();

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

Protected Overridable Function IsModified () As Boolean

Protected Friend Overridable Function IsModified () As Boolean

Devoluciones

true si el elemento se ha modificado; en caso contrario, false.

Ejemplos

En el ejemplo siguiente se muestra cómo extender IsModified.

protected override bool IsModified()
{
    bool ret = base.IsModified();
    // You can enter your custom processing code here.
    return ret;
}

    Protected Overrides Function IsModified() As Boolean
        Dim ret As Boolean = MyBase.IsModified()
        ' Enter your custom processing code here.
        Return ret

    End Function 'IsModified
End Class

Se llama al método que se muestra en el ejemplo anterior cuando se modifica un elemento de configuración, como en el ejemplo siguiente.

// Show how to use IsModified.
// This method modifies the port property
// of the url element named Microsoft and
// saves the modification to the configuration
// file. This in turn will cause the overriden
// UrlConfigElement.IsModified() mathod to be called. 
static void ModifyElement()
{
    try
    {
        // Get the configuration file.
        System.Configuration.Configuration config =
            ConfigurationManager.OpenExeConfiguration(
            ConfigurationUserLevel.None);

        // Get the MyUrls section.
        UrlsSection myUrlsSection =
            config.GetSection("MyUrls") as UrlsSection;

        UrlsCollection elements = myUrlsSection.Urls;

        IEnumerator elemEnum =
            elements.GetEnumerator();

        int i = 0;
        while (elemEnum.MoveNext())
        {
            if (elements[i].Name == "Microsoft")
            {
                elements[i].Port = 1010;
                bool readOnly = elements[i].IsReadOnly();
                break;
            }
            i += 1;
        }

        if (!myUrlsSection.ElementInformation.IsLocked)
        {

            config.Save(ConfigurationSaveMode.Full);

            // This to obsolete the MyUrls cached 
            // section and read the updated version
            // from the configuration file.
            ConfigurationManager.RefreshSection("MyUrls");
        }
        else
            Console.WriteLine(
                "Section was locked, could not update.");
    }

    catch (ConfigurationErrorsException err)
    {
        Console.WriteLine("[ModifyElement: {0}]",
            err.ToString());
    }
}

' Show how to use IsModified.
' This method modifies the port property
' of the url element named Microsoft and
' saves the modification to the configuration
' file. This in turn will cause the overriden
' UrlConfigElement.IsModified() mathod to be called. 
Shared Sub ModifyElement()
    Try
        ' Get the current configuration file.
        Dim config _
        As System.Configuration.Configuration = _
        ConfigurationManager.OpenExeConfiguration( _
        ConfigurationUserLevel.None)

        ' Get the MyUrls section.
        Dim myUrlsSection As UrlsSection = _
        config.GetSection("MyUrls")


        Dim elements As UrlsCollection = _
        myUrlsSection.Urls


        Dim elemEnum As IEnumerator = _
        elements.GetEnumerator()

        Dim i As Integer = 0
        While elemEnum.MoveNext()
            If elements(i).Name = "Microsoft" Then
                elements(i).Port = 1010
                Dim [readOnly] As Boolean = _
                elements(i).IsReadOnly()
                Exit While
            End If
            i += 1
        End While

        If Not myUrlsSection.ElementInformation.IsLocked Then

            config.Save(ConfigurationSaveMode.Full)

            ' This to obsolete the MyUrls cached 
            ' section and read the updated version 
            ' from the configuration file.
            ConfigurationManager.RefreshSection("MyUrls")
        Else
            Console.WriteLine("Section was locked, could not update.")
        End If

    Catch err As ConfigurationErrorsException
        Console.WriteLine("[ModifyElement: {0}]", _
        err.ToString())
    End Try

End Sub

Comentarios

El IsModified método determina si este ConfigurationElement objeto se escribirá en el archivo de configuración cuando se llame al Save método . Si el valor devuelto es false, se presupone que el archivo de configuración representa el estado actual del elemento.

De forma predeterminada, IsModified devuelve true después de establecer una propiedad a través del indizador en este ConfigurationElement objeto.

Invalide el IsModified método para proporcionar una indicación personalizada del estado de este ConfigurationElement elemento.

Se aplica a