通过

Attachment 构造函数

  • 参考

定义

命名空间:
System.Net.Mail
程序集:
System.Net.Mail.dll
程序集:
System.dll
程序集:
netstandard.dll

初始化 Attachment 类的新实例。

重载

Attachment(String)

使用指定的内容字符串初始化 Attachment 类的新实例。
Attachment(Stream, ContentType)

使用指定的流和内容类型初始化 Attachment 类的新实例。
Attachment(Stream, String)

使用指定的流和名称初始化 Attachment 类的新实例。
Attachment(String, ContentType)

使用指定的内容字符串和 Attachment 初始化 ContentType 类的新实例。
Attachment(String, String)

使用指定的内容字符串和 MIME 类型信息初始化 Attachment 类的新实例。
Attachment(Stream, String, String)

使用指定的流、名称和 MIME 类型信息初始化 Attachment 类的新实例。

Attachment(String)

Source:
Attachment.cs
Source:
Attachment.cs
Source:
Attachment.cs

使用指定的内容字符串初始化 Attachment 类的新实例。

public:
 Attachment(System::String ^ fileName);
public Attachment (string fileName);
new System.Net.Mail.Attachment : string -> System.Net.Mail.Attachment
Public Sub New (fileName As String)

参数

fileName
String

一个 String，它包含用于创建此附件的文件路径。

例外

ArgumentNullException

fileName 为 null。

ArgumentException

fileName 为空。

示例

下面的代码示例演示如何调用此构造函数。

static void CreateMessageInlineAttachment2( String^ server, String^ textMessage )
{
   
   // Create a message and set up the recipients.
   MailMessage^ message = gcnew MailMessage( L"jane@contoso.com",L"ben@contoso.com",L"A text message for you.",L"Message: " );
   
   // Attach the message string to this email message.
   Attachment^ data = gcnew Attachment( textMessage );
   
   // Send textMessage as part of the email body.
   message->Attachments->Add( data );
   ContentType^ content = data->ContentType;
   content->MediaType = MediaTypeNames::Text::Plain;
   
   //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();
}

public static void CreateMessageInlineAttachment2(string server, string
textMessage)
{
    // Create a message and set up the recipients.
    MailMessage message = new MailMessage(
       "jane@contoso.com",
       "ben@contoso.com",
       "A text message for you.",
       "Message: ");

    // Attach the message string to this email message.
    Attachment data = new Attachment(textMessage);
    // Send textMessage as part of the email body.
    message.Attachments.Add(data);
    ContentType content = data.ContentType;
    content.MediaType = MediaTypeNames.Text.Plain;
    //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 CreateMessageInlineAttachment2: {0}",
            ex.ToString());
    }
    data.Dispose();
}

注解

属性设置如下：

属性 值
MediaType Plain.
TransferEncoding QuotedPrintable.

适用于

Attachment(Stream, ContentType)

Source:
Attachment.cs
Source:
Attachment.cs
Source:
Attachment.cs

使用指定的流和内容类型初始化 Attachment 类的新实例。

public:
 Attachment(System::IO::Stream ^ contentStream, System::Net::Mime::ContentType ^ contentType);
public Attachment (System.IO.Stream contentStream, System.Net.Mime.ContentType contentType);
new System.Net.Mail.Attachment : System.IO.Stream * System.Net.Mime.ContentType -> System.Net.Mail.Attachment
Public Sub New (contentStream As Stream, contentType As ContentType)

参数

contentStream
Stream

一个包含附件内容的可读 Stream。

contentType
ContentType

一个 ContentType，它描述 contentStream 中的数据。

例外

ArgumentNullException

contentType 为 null。

或

contentStream 为 null。

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 SendErrorLog( 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.
   ContentType^ ct = gcnew ContentType( MediaTypeNames::Text::Plain );
   
   // Attach the log file stream to the email message.
   Attachment^ data = gcnew Attachment( fs,ct );
   ContentDisposition^ disposition = data->ContentDisposition;
   
   // Suggest a file name for the attachment.
   disposition->FileName = String::Format( L"log{0}.txt", DateTime::Now );
   
   // 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();
}

// The following example sends a summary of a log file as the message
// and the log as an email attachment.
public static void SendErrorLog(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.
    ContentType ct = new ContentType(MediaTypeNames.Text.Plain);
    // Attach the log file stream to the email message.
    Attachment data = new Attachment(fs, ct);
    ContentDisposition disposition = data.ContentDisposition;
    // Suggest a file name for the attachment.
    disposition.FileName = "log" + DateTime.Now.ToString() + ".txt";
    // 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 SendErrorLog: {0}",
            ex.ToString());
    }
    data.Dispose();
    // Close the log file.
    fs.Close();
}

注解

将 TransferEncoding 属性设置为 Base64。

如果流的 CanSeek 属性为 false，则附件和 MailMessage 包含它的 不可重用。 必须提供可以搜索以重复使用附件的流。

适用于

Attachment(Stream, String)

Source:
Attachment.cs
Source:
Attachment.cs
Source:
Attachment.cs

使用指定的流和名称初始化 Attachment 类的新实例。

public:
 Attachment(System::IO::Stream ^ contentStream, System::String ^ name);
public Attachment (System.IO.Stream contentStream, string? name);
public Attachment (System.IO.Stream contentStream, string name);
new System.Net.Mail.Attachment : System.IO.Stream * string -> System.Net.Mail.Attachment
Public Sub New (contentStream As Stream, name As String)

参数

contentStream
Stream

一个包含附件内容的可读 Stream。

name
String

一个 String，它包含与此附件关联的 Name 的 ContentType 属性值。 此值可为 null。

例外

ArgumentNullException

contentStream 为 null。

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

如果 name 不 null 为或等于 String.Empty (“”) ， ContentType 则构造此附件的 ， Name 并将 属性设置为 name。 将 TransferEncoding 属性设置为 Base64。

如果流的 CanSeek 属性为 false，则附件和 MailMessage 包含它的 不可重用。 必须提供可以搜索的流才能重复使用附件。

适用于

Attachment(String, ContentType)

Source:
Attachment.cs
Source:
Attachment.cs
Source:
Attachment.cs

使用指定的内容字符串和 Attachment 初始化 ContentType 类的新实例。

public:
 Attachment(System::String ^ fileName, System::Net::Mime::ContentType ^ contentType);
public Attachment (string fileName, System.Net.Mime.ContentType contentType);
new System.Net.Mail.Attachment : string * System.Net.Mime.ContentType -> System.Net.Mail.Attachment
Public Sub New (fileName As String, contentType As ContentType)

参数

fileName
String

一个 String，它包含用于创建此附件的文件路径。

contentType
ContentType

一个 ContentType，它描述 fileName 中的数据。

例外

ArgumentNullException

fileName 为 null。

ArgumentException

mediaType 的格式不正确。

适用于

Attachment(String, String)

Source:
Attachment.cs
Source:
Attachment.cs
Source:
Attachment.cs

使用指定的内容字符串和 MIME 类型信息初始化 Attachment 类的新实例。

public:
 Attachment(System::String ^ fileName, System::String ^ mediaType);
public Attachment (string fileName, string? mediaType);
public Attachment (string fileName, string mediaType);
new System.Net.Mail.Attachment : string * string -> System.Net.Mail.Attachment
Public Sub New (fileName As String, mediaType As String)

参数

fileName
String

一个包含附件内容的 String。

mediaType
String

String 包含此附件的 MIME 内容标头信息。 此值可为 null。

例外

ArgumentNullException

fileName 为 null。

FormatException

mediaType 的格式不正确。

示例

下面的代码示例演示如何调用此构造函数。

static void CreateMessageInlineAttachment( String^ server, String^ textMessage )
{
   
   // Create a message and set up the recipients.
   MailMessage^ message = gcnew MailMessage( L"jane@contoso.com",L"ben@contoso.com",L"An inline text message for you.",L"Message: " );
   
   // Attach the message string to this email message.
   Attachment^ data = gcnew Attachment( textMessage,MediaTypeNames::Text::Plain );
   
   // Send textMessage as part of the email body.
   message->Attachments->Add( data );
   ContentDisposition^ disposition = data->ContentDisposition;
   disposition->Inline = true;
   
   //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();
}

public static void CreateMessageInlineAttachment(string server, string
textMessage)
{
    // Create a message and set up the recipients.
    MailMessage message = new MailMessage(
       "jane@contoso.com",
       "ben@contoso.com",
       "An inline text message for you.",
       "Message: ");

    // Attach the message string to this email message.
    Attachment data = new Attachment(textMessage, MediaTypeNames.Text.Plain);
    // Send textMessage as part of the email body.
    message.Attachments.Add(data);
    ContentDisposition disposition = data.ContentDisposition;
    disposition.Inline = true;
    //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 CreateMessageInlineAttachment: {0}",
            ex.ToString());
    }
    data.Dispose();
}

注解

如果 mediaType 为 null 或等于 String.Empty (“”) ， MediaType 则此附件的 属性设置为 Plain。 如果 mediaType 不是 null 且 不是零长度字符串，则用于构造 ContentType 与此附件关联的 。

适用于

Attachment(Stream, String, String)

Source:
Attachment.cs
Source:
Attachment.cs
Source:
Attachment.cs

使用指定的流、名称和 MIME 类型信息初始化 Attachment 类的新实例。

public:
 Attachment(System::IO::Stream ^ contentStream, System::String ^ name, System::String ^ mediaType);
public Attachment (System.IO.Stream contentStream, string? name, string? mediaType);
public Attachment (System.IO.Stream contentStream, string name, string mediaType);
new System.Net.Mail.Attachment : System.IO.Stream * string * string -> System.Net.Mail.Attachment
Public Sub New (contentStream As Stream, name As String, mediaType As String)

参数

contentStream
Stream

一个包含附件内容的可读 Stream。

name
String

一个 String，它包含与此附件关联的 Name 的 ContentType 属性值。 此值可为 null。

mediaType
String

String 包含此附件的 MIME 内容标头信息。 此值可为 null。

例外

ArgumentNullException

stream 为 null。

FormatException

mediaType 的格式不正确。

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 SendNamedAndTypedErrorLog( 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 );
   
   // Create a name for the log data file.
   String^ name = String::Format( L"log{0}.txt", DateTime::Now );
   
   // Create the attachment, name it, and specify the MIME type.
   Attachment^ data = gcnew Attachment( fs,name,MediaTypeNames::Text::Plain );
   
   // 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();
}

// The following example sends a summary of a log file as the message
// and the log as an email attachment.
public static void SendNamedAndTypedErrorLog(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);
    // Create a name for the log data file.
    string name = "log" + DateTime.Now.ToString() + ".txt";
    // Create the attachment, name it, and specify the MIME type.
    Attachment data = new Attachment(fs, name, MediaTypeNames.Text.Plain);
    // 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 SendNamedAndTypedErrorLog: {0}",
            ex.ToString());
    }
    data.Dispose();
    // Close the log file.
    fs.Close();
}

注解

如果 mediaType 不等于String.Empty或等于 null (“”) ，则用于构造ContentType与此附件关联的类。

如果 mediaType 和 name 都包含 Name 信息，则使用 中指定的 name 值。 将 TransferEncoding 属性设置为 Base64。

如果流的 CanSeek 属性为 false，则附件和 MailMessage 包含它的 不可重用。 必须提供可以搜索的流才能重复使用附件。

适用于