ContentType Class


Represents a MIME protocol Content-Type header.

Namespace:   System.Net.Mime
Assembly:  System (in System.dll)


public ref class ContentType 


Initializes a new default instance of the ContentType class.


Initializes a new instance of the ContentType class using the specified string.


Gets or sets the value of the boundary parameter included in the Content-Type header represented by this instance.


Gets or sets the value of the charset parameter included in the Content-Type header represented by this instance.


Gets or sets the media type value included in the Content-Type header represented by this instance.


Gets or sets the value of the name parameter included in the Content-Type header represented by this instance.


Gets the dictionary that contains the parameters included in the Content-Type header represented by this instance.


Determines whether the content-type header of the specified ContentType object is equal to the content-type header of this object.(Overrides Object::Equals(Object^).)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Determines the hash code of the specified ContentType object(Overrides Object::GetHashCode().)


Gets the Type of the current instance.(Inherited from Object.)


Creates a shallow copy of the current Object.(Inherited from Object.)


Returns a string representation of this ContentType object.(Overrides Object::ToString().)

The information in the ContentType class is used to describe the data contained in an e-mail message in such a way that software that displays e-mail can present the content in an appropriate manner. ContentType is used with the Attachment class to specify the type of content in the attachment.

The syntax of the Content-Type header is described in RFC 2045 Section 5.1. RFC 2046 provides detailed information about MIME media types and their parameters. These RFCs are available at

The following code example sends an e-mail message with an attachment and displays the ContentDisposition properties for the attachment.

static void CreateMessageWithAttachment( String^ server )

   // Specify the file to be attached and sent.
   // This example assumes that a file named Data.xls exists in the
   // current working directory.
   String^ file = L"data.xls";

   // Create a message and set up the recipients.
   MailMessage^ message = gcnew MailMessage( L"",L"",L"Quarterly data report.",L"See the attached spreadsheet." );

   // Create  the file attachment for this e-mail message.
   Attachment^ data = gcnew Attachment(file, MediaTypeNames::Application::Octet);

   // Add time stamp information for the file.
   ContentDisposition^ disposition = data->ContentDisposition;
   disposition->CreationDate = System::IO::File::GetCreationTime( file );
   disposition->ModificationDate = System::IO::File::GetLastWriteTime( file );
   disposition->ReadDate = System::IO::File::GetLastAccessTime( file );

   // Add the file attachment to this e-mail message.
   message->Attachments->Add( data );

   //Send the message.
   SmtpClient^ client = gcnew SmtpClient( server );

   // Add credentials if the SMTP server requires them.
   client->Credentials = CredentialCache::DefaultNetworkCredentials;
   client->Send( message );

   // Display the values in the ContentDisposition for the attachment.
   ContentDisposition^ cd = data->ContentDisposition;
   Console::WriteLine( L"Content disposition" );
   Console::WriteLine( cd );
   Console::WriteLine( L"File {0}", cd->FileName );
   Console::WriteLine( L"Size {0}", cd->Size );
   Console::WriteLine( L"Creation {0}", cd->CreationDate );
   Console::WriteLine( L"Modification {0}", cd->ModificationDate );
   Console::WriteLine( L"Read {0}", cd->ReadDate );
   Console::WriteLine( L"Inline {0}", cd->Inline );
   Console::WriteLine( L"Parameters: {0}", cd->Parameters->Count );
   IEnumerator^ myEnum1 = cd->Parameters->GetEnumerator();
   while ( myEnum1->MoveNext() )
      DictionaryEntry^ d = safe_cast<DictionaryEntry^>(myEnum1->Current);
      Console::WriteLine( L"{0} = {1}", d->Key, d->Value );


.NET Framework
Available since 2.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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