ConfigurationElement.IsModified Método

Definição

Indica se este elemento de configuração foi modificado desde a última vez em que foi salvo ou carregado quando implementado em uma classe derivada.Indicates whether this configuration element has been modified since it was last saved or loaded, when implemented in a derived class.

protected public:
 virtual bool IsModified();
protected internal virtual bool IsModified ();
abstract member IsModified : unit -> bool
override this.IsModified : unit -> bool
Protected Friend Overridable Function IsModified () As Boolean

Retornos

true se o elemento tiver sido modificado, caso contrário, false.true if the element has been modified; otherwise, false.

Exemplos

O exemplo a seguir mostra como estender IsModified.The following example shows how to extend 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

O método mostrado no exemplo anterior é chamado quando um elemento de configuração é modificado, como no exemplo a seguir.The method shown in the previous example is called when a configuration element is modified, as in the following example.

// 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

Comentários

O método IsModified determina se este objeto ConfigurationElement será gravado no arquivo de configuração quando o método Save for chamado.The IsModified method determines whether this ConfigurationElement object will be written to the configuration file when the Save method is called. Se o valor de retorno for false, supõe-se que o arquivo de configuração representa o estado atual do elemento.If the return value is false, it is assumed that the configuration file represents the current state of the element.

Por padrão, IsModified retorna true depois que uma propriedade é definida por meio do indexador para esse objeto ConfigurationElement.By default, IsModified returns true after a property is set through the indexer to this ConfigurationElement object.

Substitua o método IsModified para fornecer uma indicação personalizada do estado deste elemento ConfigurationElement.Override the IsModified method to provide custom indication of the state of this ConfigurationElement element.

Aplica-se a