ContentType.ToString 方法

定义

命名空间:

System.Net.Mime

程序集:

System.Net.Mail.dll

Source:

ContentType.cs

返回此 ContentType 对象的字符串表示形式。

public:
 override System::String ^ ToString();

public override string ToString ();

override this.ToString : unit -> string

Public Overrides Function ToString () As String

返回

String

一个 String，其中包含此 ContentType 的当前设置。

示例

下面的代码示例显示 的 ContentType字符串表示形式。

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

方法的值 ToString 包含用于创建此 ContentType的字符串（如果指定了一个 ），并且未更改任何属性值。 如果未指定字符串，或者自创建此 ContentType 字符串以来一个或多个属性值已更改，则 的值 ToString 是使用当前属性值构成的 Content-Type 标头格式的字符串。 字符串不包括 "Content-type:" 前缀。

RFC 2045 第 5.1 节中介绍了 Content-Type 标头的语法，可从 https://www.ietf.org获取。