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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.net.mime.contenttype below:

ContentType Class (System.Net.Mime) | Microsoft Learn

Represents a MIME protocol Content-Type header.

public ref class ContentType

public class ContentType

type ContentType = class

Public Class ContentType

Inheritance

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

public 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 = "data.xls";
    // Create a message and set up the recipients.
    MailMessage message = new MailMessage(
        "jane@contoso.com",
        "ben@contoso.com",
        "Quarterly data report.",
        "See the attached spreadsheet.");

    // Create  the file attachment for this email message.
    Attachment data = new 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 email message.
    message.Attachments.Add(data);

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

    try
    {
        client.Send(message);
    }
    catch (Exception ex)
    {
        Console.WriteLine("Exception caught in CreateMessageWithAttachment(): {0}",
            ex.ToString());
    }
    // Display the values in the ContentDisposition for the attachment.
    ContentDisposition cd = data.ContentDisposition;
    Console.WriteLine("Content disposition");
    Console.WriteLine(cd.ToString());
    Console.WriteLine("File {0}", cd.FileName);
    Console.WriteLine("Size {0}", cd.Size);
    Console.WriteLine("Creation {0}", cd.CreationDate);
    Console.WriteLine("Modification {0}", cd.ModificationDate);
    Console.WriteLine("Read {0}", cd.ReadDate);
    Console.WriteLine("Inline {0}", cd.Inline);
    Console.WriteLine("Parameters: {0}", cd.Parameters.Count);
    foreach (DictionaryEntry d in cd.Parameters)
    {
        Console.WriteLine("{0} = {1}", d.Key, d.Value);
    }
    data.Dispose();
}

The information in the ContentType class is used to describe the data contained in an email message in such a way that software that displays email 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 https://www.ietf.org.

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.

• SmtpClient
• MailMessage

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