在web.config中设置多个SMTP设置？

Question

我正在构建一个应用程序,需要动态/编程地知道并在发送电子邮件时使用不同的SMTP设置.

我习惯使用system.net/mailSettings方法,但据我所知,它只允许一次一个SMTP连接定义,由SmtpClient()使用.

但是,我需要更多类似connectionStrings的方法,我可以根据键/名称提取一组设置.

有什么建议？我愿意跳过传统的SmtpClient/mailSettings方法,我认为必须......

Answer 1

我需要在web.config中有不同的smtp配置,具体取决于环境:dev,staging和production.

这是我最终使用的内容:

在web.config中:

<configuration>
  <configSections>
    <sectionGroup name="mailSettings">
      <section name="smtp_1" type="System.Net.Configuration.SmtpSection"/>
      <section name="smtp_2" type="System.Net.Configuration.SmtpSection"/>
      <section name="smtp_3" type="System.Net.Configuration.SmtpSection"/>
    </sectionGroup>
  </configSections>
  <mailSettings>
    <smtp_1 deliveryMethod="Network" from="mail1@temp.uri">
      <network host="..." defaultCredentials="false"/>
    </smtp_1>
    <smtp_2 deliveryMethod="Network" from="mail2@temp.uri">
      <network host="1..." defaultCredentials="false"/>
    </smtp_2>
    <smtp_3 deliveryMethod="Network" from="mail3@temp.uri">
      <network host="..." defaultCredentials="false"/>
    </smtp_3>
  </mailSettings>
</configuration>

然后在代码中:

return (SmtpSection)ConfigurationManager.GetSection("mailSettings/smtp_1");
return (SmtpSection)ConfigurationManager.GetSection("mailSettings/smtp_2");
return (SmtpSection)ConfigurationManager.GetSection("mailSettings/smtp_3");

Answer 2

SmtpSection smtpSection =  (SmtpSection)ConfigurationManager.GetSection("mailSettings/smtp_1");

SmtpClient smtpClient = new SmtpClient(smtpSection.Network.Host, smtpSection.Network.Port);
smtpClient.Credentials = new NetworkCredential(smtpSection.Network.UserName, smtpSection.Network.Password);

Answer 3

这是我如何使用它,它对我来说很好(设置类似于Mikko答案):

1. 首先设置配置部分:

   <configuration>
     <configSections>
       <sectionGroup name="mailSettings">
         <section name="default" type="System.Net.Configuration.SmtpSection" />
         <section name="mailings" type="System.Net.Configuration.SmtpSection" />
         <section name="partners" type="System.Net.Configuration.SmtpSection" />
       </sectionGroup>
     </configSections>
   <mailSettings>
     <default deliveryMethod="Network">
       <network host="smtp1.test.org" port="587" enableSsl="true"
              userName="test" password="test"/>
     </default>
     <mailings deliveryMethod="Network">
       <network host="smtp2.test.org" port="587" enableSsl="true"
              userName="test" password="test"/>
     </mailings>
   <partners deliveryMethod="Network">
     <network host="smtp3.test.org" port="587" enableSsl="true"
              userName="test" password="test"/>
   </partners>
   

2. 那么最好创建一种包装器.请注意,大部分的代码下面是从.NET源代码采取SmtpClient 这里

   public class CustomSmtpClient
   {
       private readonly SmtpClient _smtpClient;
   
       public CustomSmtpClient(string sectionName = "default")
       {
           SmtpSection section = (SmtpSection)ConfigurationManager.GetSection("mailSettings/" + sectionName);
   
           _smtpClient = new SmtpClient();
   
           if (section != null)
           {
               if (section.Network != null)
               {
                   _smtpClient.Host = section.Network.Host;
                   _smtpClient.Port = section.Network.Port;
                   _smtpClient.UseDefaultCredentials = section.Network.DefaultCredentials;
   
                   _smtpClient.Credentials = new NetworkCredential(section.Network.UserName, section.Network.Password, section.Network.ClientDomain);
                   _smtpClient.EnableSsl = section.Network.EnableSsl;
   
                   if (section.Network.TargetName != null)
                       _smtpClient.TargetName = section.Network.TargetName;
               }
   
               _smtpClient.DeliveryMethod = section.DeliveryMethod;
               if (section.SpecifiedPickupDirectory != null && section.SpecifiedPickupDirectory.PickupDirectoryLocation != null)
                   _smtpClient.PickupDirectoryLocation = section.SpecifiedPickupDirectory.PickupDirectoryLocation;
           }
       }
   
       public void Send(MailMessage message)
       {
           _smtpClient.Send(message);
       }
   

   }

3. 然后只需发送电子邮件

   new CustomSmtpClient("mailings").Send(new MailMessage())