ContentType.Boundary Property
Important
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Gets or sets the value of the boundary parameter included in the Content-Type header represented by this instance.
public:
property System::String ^ Boundary { System::String ^ get(); void set(System::String ^ value); };
public string? Boundary { get; set; }
public string Boundary { get; set; }
member this.Boundary : string with get, set
Public Property Boundary As String
A String that contains the value associated with the boundary parameter.
The following code example displays the value of the Boundary property.
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();
}
In the following example of a Content-Type header, the value of the Boundary parameter is "-----boundary---0
".
content-type: multipart/mixed; boundary=-----boundary---0
Set this property to null
or String.Empty to remove the boundary information from the header.
The syntax of the Content-Type header is described in RFC 2045 Section 5.1. An in-depth discussion of the boundary parameter is contained in RFC 2046 Section 5.1.1. These RFCs are available at https://www.ietf.org.
Product | Versions |
---|---|
.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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