MailMessage.AlternateViews 属性
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
获取用于存储邮件正文的替代形式的附件集合。
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.AlternateViewCollectionPublic ReadOnly Property AlternateViews As AlternateViewCollection属性值
示例
下面的代码示例演示如何创建和发送电子邮件，其中包含纯文本和 HTML 备用视图。
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
注解
使用 AlternateViews 属性以不同格式指定电子邮件的副本。 例如，如果以 HTML 形式发送邮件，你可能还希望提供纯文本版本，以防某些收件人使用无法显示 HTML 内容的电子邮件阅读器。
若要向对象添加备用视图 MailMessage ，请为视图创建一个 Attachment 视图，然后将其添加到返回的 AlternateViews集合。 使用 Body 属性指定文本版本，并使用 AlternateViews 集合来指定具有其他 MIME 类型的视图。 使用 MediaTypeNames 类成员为备用视图指定 MIME 类型。