ContentType 构造函数

参考

定义

命名空间:: System.Net.Mime

程序集:: System.Net.Mail.dll

程序集:: System.dll

程序集:: netstandard.dll

重要

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初始化 ContentType 类的新实例。

重载

ContentType()	初始化 ContentType 类的新默认实例。
ContentType(String)	使用指定的字符串初始化 ContentType 类的新实例。

ContentType()

Source:: ContentType.cs

Source:: ContentType.cs

Source:: ContentType.cs

初始化 ContentType 类的新默认实例。

public:
 ContentType();

public ContentType ();

Public Sub New ()

示例

下面的代码示例演示如何调用此构造函数。

// The following example sends a summary of a log file as the message
// and the log as an email 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;
}

// 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;
}

注解

此构造函数将 MediaType 属性初始化为 "application/octet-stream"。

适用于

ContentType(String)

Source:: ContentType.cs

Source:: ContentType.cs

Source:: ContentType.cs

使用指定的字符串初始化 ContentType 类的新实例。

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)

参数

contentType: String

一个 String，例如，包含 MIME 媒体类型、子类型和可选参数的 "text/plain; charset=us-ascii"。

例外

ArgumentNullException

contentType 为 null。

ArgumentException

contentType 为 Empty ("")。

FormatException

contentType 所用的形式无法进行分析。

示例

下面的代码示例演示如何调用此构造函数。

// The following example sends a summary of a log file as the message
// and the log as an email 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;
}

// 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;
}

注解

在上提供的 https://www.ietf.orgRFC 2045 第 5.1 节中介绍了字符串的contentType语法。

适用于

通过

ContentType 构造函数

定义

重载

ContentType()

示例

注解

适用于

ContentType(String)

参数

例外

示例

注解

适用于

其他资源