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Attachment Constructor (Stream, String)

Initializes a new instance of the Attachment class with the specified stream and name.

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

public:
Attachment(
	Stream^ contentStream, 
	String^ name
)

Parameters

contentStream
Type: System.IO::Stream
A readable Stream that contains the content for this attachment.
name
Type: System::String
A String that contains the value for the Name property of the ContentType associated with this attachment. This value can be nullptr.

ExceptionCondition
ArgumentNullException

contentStream is nullptr.

If name is not nullptr or equal to String::Empty (""), the ContentType for this attachment is constructed with the Name property set to name. The TransferEncoding property is set to Base64.

If the stream's CanSeek property is false, the attachment and the MailMessage that contains it are not reusable. You must supply a stream that can be searched in order to reuse an attachment.

The following code example demonstrates how to call this constructor.


   // The following example sends a summary of a log file as the message
   // and the log as an e-mail attachment.
   static void SendNamedErrorLog( String^ server, String^ recipientList )
   {

      // Create a message from logMailer@contoso.com to recipientList.
      MailMessage^ message = gcnew MailMessage( L"logMailer@contoso.com",recipientList );
      message->Subject = L"Error Log report";
      String^ fileName = L"log.txt";

      // Get the file stream for the error log.
      // Requires the System.IO namespace.
      FileStream^ fs = gcnew FileStream( fileName,FileMode::Open,FileAccess::Read );
      StreamReader^ s = gcnew StreamReader( fs );
      int errors = 0;
      while ( s->ReadLine() != nullptr )
      {

         // Process each line from the log file here.
         errors++;
      }

      message->Body = String::Format( L"{0} errors in log as of {1}", errors, DateTime::Now );

      // Close the stream reader. This also closes the file.
      s->Close();

      // Re-open the file at the beginning to make the attachment.
      fs = gcnew FileStream( fileName,FileMode::Open,FileAccess::Read );

      // Make a ContentType indicating that the log data
      // that is attached is plain text and is named.
      ContentType^ ct = gcnew ContentType;
      ct->MediaType = MediaTypeNames::Text::Plain;
      ct->Name = String::Format( L"log{0}.txt", DateTime::Now );

      // Create the attachment.
      Attachment^ data = gcnew Attachment( fs,ct );

      // Add the attachment to the message.
      message->Attachments->Add( data );

      // Send the message.
      // Include credentials if the server requires them.
      SmtpClient^ client = gcnew SmtpClient( server );
      client->Credentials = CredentialCache::DefaultNetworkCredentials;
      client->Send( message );
      data->~Attachment();
      client->~SmtpClient();

      // Close the log file.
      fs->Close();
      return;
   }




.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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