MailMessage.AlternateViews Propiedad

Referencia

Definición

Espacio de nombres:: System.Net.Mail

Ensamblado:: System.Net.Mail.dll

Ensamblado:: System.dll

Ensamblado:: netstandard.dll

Source:: MailMessage.cs

Source:: MailMessage.cs

Source:: MailMessage.cs

Importante

Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.

Obtiene la colección de datos adjuntos que se utiliza para almacenar formatos alternativos del cuerpo del mensaje.

public:
 property System::Net::Mail::AlternateViewCollection ^ AlternateViews { System::Net::Mail::AlternateViewCollection ^ get(); };

public System.Net.Mail.AlternateViewCollection AlternateViews { get; }

member this.AlternateViews : System.Net.Mail.AlternateViewCollection

Public ReadOnly Property AlternateViews As AlternateViewCollection

Valor de propiedad

AlternateViewCollection

Colección AlternateViewCollection que admite escritura.

Ejemplos

En el ejemplo de código siguiente se muestra cómo crear y enviar un mensaje de correo electrónico con un texto sin formato y una vista alternativa HTML.

static void CreateMessageWithMultipleViews( String^ server, String^ recipients )
{
   
   // Create a message and set up the recipients.
   MailMessage^ message = gcnew MailMessage( L"jane@contoso.com",recipients,L"This email message has multiple views.",L"This is some plain text." );
   
   // Construct the alternate body as HTML.
   String^ body = L"<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">";
   body = String::Concat( body, L"<HTML><HEAD><META http-equiv=Content-Type content=\"text/html; charset=iso-8859-1\">" );
   body = String::Concat( body, L"</HEAD><BODY><DIV><FONT face=Arial color=#ff0000 size=2>this is some HTML text" );
   body = String::Concat( body, L"</FONT></DIV></BODY></HTML>" );
   
   // Add the alternate body to the message.
   AlternateView^ alternate = AlternateView::CreateAlternateViewFromString(body);
   message->AlternateViews->Add(alternate);

   // Send the message.
   SmtpClient^ client = gcnew SmtpClient( server );
   client->Credentials = CredentialCache::DefaultNetworkCredentials;
   client->Send( message );
   
   // Display the values in the ContentType for the attachment.
   ContentType^ c = alternate->ContentType;
   Console::WriteLine( L"Content type" );
   Console::WriteLine( c );
   Console::WriteLine( L"Boundary {0}", c->Boundary );
   Console::WriteLine( L"CharSet {0}", c->CharSet );
   Console::WriteLine( L"MediaType {0}", c->MediaType );
   Console::WriteLine( L"Name {0}", c->Name );
   Console::WriteLine( L"Parameters: {0}", c->Parameters->Count );
   IEnumerator^ myEnum = c->Parameters->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      DictionaryEntry^ d = safe_cast<DictionaryEntry^>(myEnum->Current);
      Console::WriteLine( L"{0} = {1}", d->Key, d->Value );
   }

   Console::WriteLine();
   alternate->~AlternateView();
}

public static void CreateMessageWithMultipleViews(string server, string recipients)
{
    // Create a message and set up the recipients.
    MailMessage message = new MailMessage(
        "jane@contoso.com",
        recipients,
        "This email message has multiple views.",
        "This is some plain text.");

    // Construct the alternate body as HTML.
    string body = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">";
    body += "<HTML><HEAD><META http-equiv=Content-Type content=\"text/html; charset=iso-8859-1\">";
    body += "</HEAD><BODY><DIV><FONT face=Arial color=#ff0000 size=2>this is some HTML text";
    body += "</FONT></DIV></BODY></HTML>";

    ContentType mimeType = new System.Net.Mime.ContentType("text/html");
    // Add the alternate body to the message.

    AlternateView alternate = AlternateView.CreateAlternateViewFromString(body, mimeType);
    message.AlternateViews.Add(alternate);

    // Send the message.
    SmtpClient client = new SmtpClient(server);
    client.Credentials = CredentialCache.DefaultNetworkCredentials;

    try
    {
        client.Send(message);
    }
    catch (Exception ex)
    {
        Console.WriteLine("Exception caught in CreateMessageWithMultipleViews(): {0}",
            ex.ToString());
    }
    // Display the values in the ContentType for the attachment.
    ContentType c = alternate.ContentType;
    Console.WriteLine("Content type");
    Console.WriteLine(c.ToString());
    Console.WriteLine("Boundary {0}", c.Boundary);
    Console.WriteLine("CharSet {0}", c.CharSet);
    Console.WriteLine("MediaType {0}", c.MediaType);
    Console.WriteLine("Name {0}", c.Name);
    Console.WriteLine("Parameters: {0}", c.Parameters.Count);
    foreach (DictionaryEntry d in c.Parameters)
    {
        Console.WriteLine("{0} = {1}", d.Key, d.Value);
    }
    Console.WriteLine();
    alternate.Dispose();
}

Public Shared Sub CreateMessageWithMultipleViews(ByVal server As String, ByVal recipients As String)
    ' Create a message and set up the recipients.
    Dim message As MailMessage = New MailMessage(
        "jane@contoso.com",
        recipients,
        "This email message has multiple views.",
        "This is some plain text.")

    ' Construct the alternate body as HTML.
    Dim body As String = "<!DOCTYPE HTML PUBLIC ""-//W3C//DTD HTML 4.0 Transitional//EN"">"
    body += "<HTML><HEAD><META http-equiv=Content-Type content=""text/html; charset=iso-8859-1"">"
    body += "</HEAD><BODY><DIV><FONT face=Arial color=#ff0000 size=2>this is some HTML text"
    body += "</FONT></DIV></BODY></HTML>"

    Dim mimeType As ContentType = New System.Net.Mime.ContentType("text/html")

    ' Add the alternate body to the message.
    Dim alternate As AlternateView = AlternateView.CreateAlternateViewFromString(body, mimeType)
    message.AlternateViews.Add(alternate)

    ' Send the message.
    Dim client As SmtpClient = New SmtpClient(server)
    client.Credentials = CredentialCache.DefaultNetworkCredentials

    Try
        client.Send(message)
    Catch ex As Exception
        Console.WriteLine("Exception caught in CreateMessageWithMultipleViews(): {0}", ex.ToString())
    End Try

    ' Display the values in the ContentType for the attachment.
    Dim c As ContentType = alternate.ContentType
    Console.WriteLine("Content type")
    Console.WriteLine(c.ToString())
    Console.WriteLine("Boundary {0}", c.Boundary)
    Console.WriteLine("CharSet {0}", c.CharSet)
    Console.WriteLine("MediaType {0}", c.MediaType)
    Console.WriteLine("Name {0}", c.Name)
    Console.WriteLine("Parameters: {0}", c.Parameters.Count)

    For Each d As DictionaryEntry In c.Parameters
        Console.WriteLine("{0} = {1}", d.Key, d.Value)
    Next

    Console.WriteLine()
    alternate.Dispose()
End Sub

Comentarios

Utilice la AlternateViews propiedad para especificar copias de un mensaje de correo electrónico en diferentes formatos. Por ejemplo, si envía un mensaje en HTML, es posible que también desee proporcionar una versión de texto sin formato en caso de que algunos de los destinatarios usen lectores de correo electrónico que no puedan mostrar contenido HTML.

Para agregar una vista alternativa a un MailMessage objeto , cree una Attachment para la vista y, a continuación, agréguela a la colección devuelta por AlternateViews. Utilice la Body propiedad para especificar la versión de texto y use la AlternateViews colección para especificar vistas con otros tipos MIME. Use los miembros de MediaTypeNames clase para especificar el tipo MIME para la vista alternativa.

Se aplica a

Produto	Versións
.NET	Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework	2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	2.0, 2.1

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