MailMessage 构造函数

定义

命名空间:

System.Net.Mail

程序集:

System.Net.Mail.dll

初始化 MailMessage 类的新实例。

重载

MailMessage()	初始化 MailMessage 类的空实例。
MailMessage(MailAddress, MailAddress)	使用指定的 MailAddress 类对象初始化 MailMessage 类的新实例。
MailMessage(String, String)	使用指定的 String 类对象初始化 MailMessage 类的新实例。
MailMessage(String, String, String, String)	初始化 MailMessage 类的新实例。

MailMessage()

Source:

MailMessage.cs

初始化 MailMessage 类的空实例。

public:
 MailMessage();

public MailMessage ();

Public Sub New ()

注解

From 设置为 mailSettings<smtp> 元素的网络元素 (网络设置) 中的值（如果存在）。

MailMessage(MailAddress, MailAddress)

Source:

MailMessage.cs

使用指定的 MailAddress 类对象初始化 MailMessage 类的新实例。

public:
 MailMessage(System::Net::Mail::MailAddress ^ from, System::Net::Mail::MailAddress ^ to);

public MailMessage (System.Net.Mail.MailAddress from, System.Net.Mail.MailAddress to);

new System.Net.Mail.MailMessage : System.Net.Mail.MailAddress * System.Net.Mail.MailAddress -> System.Net.Mail.MailMessage

Public Sub New (from As MailAddress, to As MailAddress)

参数

from

MailAddress

MailAddress，其中包含电子邮件发件人的地址。

to

MailAddress

MailAddress，其中包含电子邮件收件人的地址。

例外

ArgumentNullException

from 为 null。

或

to 为 null。

FormatException

from 或 to 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 CreateTestMessage3()
{
   MailAddress^ to = gcnew MailAddress( L"jane@contoso.com" );
   MailAddress^ from = gcnew MailAddress( L"ben@contoso.com" );
   MailMessage^ message = gcnew MailMessage( from,to );
   message->Subject = L"Using the new SMTP client.";
   message->Body = L"Using this new feature, you can send an email message from an application very easily.";
   
   // Use the application or machine configuration to get the 
   // host, port, and credentials.
   SmtpClient^ client = gcnew SmtpClient;
   Console::WriteLine( L"Sending an email message to {0} at {1} by using the SMTP host {2}.", to->User, to->Host, client->Host );
   client->Send( message );
}

public static void CreateTestMessage3()
{
    MailAddress to = new MailAddress("jane@contoso.com");
    MailAddress from = new MailAddress("ben@contoso.com");
    MailMessage message = new MailMessage(from, to);
    message.Subject = "Using the new SMTP client.";
    message.Body = @"Using this new feature, you can send an email message from an application very easily.";
    // Use the application or machine configuration to get the
    // host, port, and credentials.
    SmtpClient client = new SmtpClient();
    Console.WriteLine("Sending an email message to {0} at {1} by using the SMTP host={2}.",
        to.User, to.Host, client.Host);
    client.Send(message);
}

Public Shared Sub CreateTestMessage3()
    Dim [to] As MailAddress = New MailAddress("jane@contoso.com")
    Dim from As MailAddress = New MailAddress("ben@contoso.com")
    Dim message As MailMessage = New MailMessage(from, [to])
    message.Subject = "Using the new SMTP client."
    message.Body = "Using this new feature, you can send an email message from an application very easily."
    'Use the application or machine configuration to get the
    ' host, port, And credentials.
    Dim client As SmtpClient = New SmtpClient()
    Console.WriteLine("Sending an email message to {0} at {1} by using the SMTP host={2}.", [to].User, [to].Host, client.Host)
    client.Send(message)
End Sub

注解

使用 From 初始化 from 属性， To 并使用 初始化 to属性。

MailMessage(String, String)

Source:

MailMessage.cs

使用指定的 String 类对象初始化 MailMessage 类的新实例。

public:
 MailMessage(System::String ^ from, System::String ^ to);

public MailMessage (string from, string to);

new System.Net.Mail.MailMessage : string * string -> System.Net.Mail.MailMessage

Public Sub New (from As String, to As String)

参数

from

String

String，其中包含电子邮件发件人的地址。

to

String

String，其中包含电子邮件收件人的地址。 多个电子邮件地址之间必须用逗号字符（“,”）分隔。

例外

ArgumentNullException

from 为 null。

或

to 为 null。

ArgumentException

from 为 Empty ("")。

或

to 为 Empty ("")。

FormatException

from 或 to 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 CreateTestMessage2( String^ server )
{
   String^ to = L"jane@contoso.com";
   String^ from = L"ben@contoso.com";
   MailMessage^ message = gcnew MailMessage( from,to );
   message->Subject = L"Using the new SMTP client.";
   message->Body = L"Using this new feature, you can send an email message from an application very easily.";
   SmtpClient^ client = gcnew SmtpClient( server );
   
   // Credentials are necessary if the server requires the client 
   // to authenticate before it will send email on the client's behalf.
   client->UseDefaultCredentials = true;
   client->Send( message );
   client->~SmtpClient();
}

public static void CreateTestMessage2(string server)
{
    string to = "jane@contoso.com";
    string from = "ben@contoso.com";
    MailMessage message = new MailMessage(from, to);
    message.Subject = "Using the new SMTP client.";
    message.Body = @"Using this new feature, you can send an email message from an application very easily.";
    SmtpClient client = new SmtpClient(server);
    // Credentials are necessary if the server requires the client
    // to authenticate before it will send email on the client's behalf.
    client.UseDefaultCredentials = true;

    try
    {
        client.Send(message);
    }
    catch (Exception ex)
    {
        Console.WriteLine("Exception caught in CreateTestMessage2(): {0}",
            ex.ToString());
    }
}

Public Shared Sub CreateTestMessage2(ByVal server As String)
    Dim [to] As String = "jane@contoso.com"
    Dim from As String = "ben@contoso.com"
    Dim message As MailMessage = New MailMessage(from, [to])
    message.Subject = "Using the new SMTP client."
    message.Body = "Using this new feature, you can send an email message from an application very easily."
    Dim client As SmtpClient = New SmtpClient(server)
    ' Credentials are necessary if the server requires the client
    ' to authenticate before it will send email on the client's behalf.
    client.UseDefaultCredentials = True

    Try
        client.Send(message)
    Catch ex As Exception
        Console.WriteLine("Exception caught in CreateTestMessage2(): {0}", ex.ToString())
    End Try
End Sub

注解

使用 From 初始化 from 属性， To 并使用 初始化 to属性。

MailMessage(String, String, String, String)

Source:

MailMessage.cs

初始化 MailMessage 类的新实例。

public:
 MailMessage(System::String ^ from, System::String ^ to, System::String ^ subject, System::String ^ body);

public MailMessage (string from, string to, string? subject, string? body);

new System.Net.Mail.MailMessage : string * string * string * string -> System.Net.Mail.MailMessage

Public Sub New (from As String, to As String, subject As String, body As String)

参数

from

String

String，其中包含电子邮件发件人的地址。

to

String

String，其中包含电子邮件收件人的地址。 多个电子邮件地址之间必须用逗号字符（“,”）分隔。

subject

String

包含主题文本的 String。

body

String

一个包含邮件正文的 String。

例外

ArgumentNullException

from 为 null。

或

to 为 null。

ArgumentException

from 为 Empty ("")。

或

to 为 Empty ("")。

FormatException

from 或 to 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 CreateTimeoutTestMessage( String^ server )
{
   String^ to = L"jane@contoso.com";
   String^ from = L"ben@contoso.com";
   String^ subject = L"Using the new SMTP client.";
   String^ body = L"Using this new feature, you can send an email message from an application very easily.";
   MailMessage^ message = gcnew MailMessage( from,to,subject,body );
   SmtpClient^ client = gcnew SmtpClient( server );
   Console::WriteLine( L"Changing time out from {0} to 100.", client->Timeout );
   client->Timeout = 100;
   
   // Credentials are necessary if the server requires the client 
   // to authenticate before it will send email on the client's behalf.
   client->Credentials = CredentialCache::DefaultNetworkCredentials;
   client->Send( message );
}

public static void CreateTimeoutTestMessage(string server)
{
    string to = "jane@contoso.com";
    string from = "ben@contoso.com";
    string subject = "Using the new SMTP client.";
    string body = @"Using this new feature, you can send an email message from an application very easily.";
    MailMessage message = new MailMessage(from, to, subject, body);
    SmtpClient client = new SmtpClient(server);
    Console.WriteLine("Changing time out from {0} to 100.", client.Timeout);
    client.Timeout = 100;
    // Credentials are necessary if the server requires the client
    // to authenticate before it will send email on the client's behalf.
    client.Credentials = CredentialCache.DefaultNetworkCredentials;
    client.Send(message);
}

Public Shared Sub CreateTimeoutTestMessage(ByVal server As String)
    Dim [to] As String = "jane@contoso.com"
    Dim from As String = "ben@contoso.com"
    Dim subject As String = "Using the new SMTP client."
    Dim body As String = "Using this new feature, you can send an email message from an application very easily."
    Dim message As MailMessage = New MailMessage(from, [to], subject, body)
    Dim client As SmtpClient = New SmtpClient(server)
    Console.WriteLine("Changing time out from {0} to 100.", client.Timeout)
    client.Timeout = 100
    ' Credentials are necessary if the server requires the client
    ' to authenticate before it will send email on the client's behalf.
    client.Credentials = CredentialCache.DefaultNetworkCredentials
    client.Send(message)
End Sub

注解

新 MailMessage 对象的属性初始化如下：

参数	properties
from	From
to	To
subject	Subject
body	Body

默认情况下，假定主题和内容使用基于本地计算机设置的默认编码。 BodyEncoding使用 和 SubjectEncoding 属性指定不同的编码。