ContentType Konstruktory

Definicja

Przestrzeń nazw:

System.Net.Mime

Zestawy:

netstandard.dll, System.Net.Mail.dll

Inicjuje nowe wystąpienie klasy ContentType.

Przeciążenia

Nazwa	Opis
ContentType()	Inicjuje nowe domyślne wystąpienie ContentType klasy.
ContentType(String)	Inicjuje nowe wystąpienie ContentType klasy przy użyciu określonego ciągu.

ContentType()

Źródło:

ContentType.cs

Inicjuje nowe domyślne wystąpienie ContentType klasy.

public:
 ContentType();

public ContentType();

Public Sub New ()

Przykłady

W poniższym przykładzie kodu pokazano, jak wywołać ten konstruktor.

// The following example sends a summary of a log file as the message
// and the log as an email attachment.
public static void SendNamedErrorLog(string server, string recipientList)
{
    // Create a message from logMailer@contoso.com to recipientList.
    MailMessage message = new MailMessage(
       "logMailer@contoso.com", recipientList);

    message.Subject = "Error Log report";
    string fileName = "log.txt";
    // Get the file stream for the error log.
    // Requires the System.IO namespace.
    FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
    StreamReader s = new StreamReader(fs);
    int errors = 0;
    while (s.ReadLine() != null)
    {
        // Process each line from the log file here.
        errors++;
    }
    // The email message summarizes the data found in the log.
    message.Body = String.Format("{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 = new 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 = new ContentType();
    ct.MediaType = MediaTypeNames.Text.Plain;
    ct.Name = "log" + DateTime.Now.ToString() + ".txt";
    // Create the attachment.
    Attachment data = new 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 = new SmtpClient(server);
    client.Credentials = CredentialCache.DefaultNetworkCredentials;

    try
    {
        client.Send(message);
    }
    catch (Exception ex)
    {
        Console.WriteLine("Exception caught in SendNamedErrorLog: {0}",
            ex.ToString());
    }
    data.Dispose();
    // Close the log file.
    fs.Close();
    return;
}

Uwagi

Ten konstruktor inicjuje MediaType właściwość na "application/octet-stream".

ContentType(String)

Źródło:

ContentType.cs

Inicjuje nowe wystąpienie ContentType klasy przy użyciu określonego ciągu.

public:
 ContentType(System::String ^ contentType);

public ContentType(string contentType);

new System.Net.Mime.ContentType : string -> System.Net.Mime.ContentType

Public Sub New (contentType As String)

Parametry

contentType

String

Na Stringprzykład "text/plain; charset=us-ascii", który zawiera typ nośnika MIME, podtyp i parametry opcjonalne.

Wyjątki

ArgumentNullException

Parametr contentType ma wartość null.

ArgumentException

contentType is Empty ("").

FormatException

contentType jest w postaci, której nie można przeanalizować.

Przykłady

W poniższym przykładzie kodu pokazano, jak wywołać ten konstruktor.

// The following example sends a summary of a log file as the message
// and the log as an email attachment.
public static void SendNamedErrorLog(string server, string recipientList)
{
    // Create a message from logMailer@contoso.com to recipientList.
    MailMessage message = new MailMessage(
       "logMailer@contoso.com", recipientList);

    message.Subject = "Error Log report";
    string fileName = "log.txt";
    // Get the file stream for the error log.
    // Requires the System.IO namespace.
    FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
    StreamReader s = new StreamReader(fs);
    int errors = 0;
    while (s.ReadLine() != null)
    {
        // Process each line from the log file here.
        errors++;
    }
    // The email message summarizes the data found in the log.
    message.Body = String.Format("{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 = new 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 = new ContentType();
    ct.MediaType = MediaTypeNames.Text.Plain;
    ct.Name = "log" + DateTime.Now.ToString() + ".txt";
    // Create the attachment.
    Attachment data = new 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 = new SmtpClient(server);
    client.Credentials = CredentialCache.DefaultNetworkCredentials;

    try
    {
        client.Send(message);
    }
    catch (Exception ex)
    {
        Console.WriteLine("Exception caught in SendNamedErrorLog: {0}",
            ex.ToString());
    }
    data.Dispose();
    // Close the log file.
    fs.Close();
    return;
}

Uwagi

Składnia contentType ciągu jest opisana w sekcji RFC 2045 5.1 dostępnej pod adresem https://www.ietf.org.