在C#中以编程方式从app.config访问system.net设置

我试图以编程方式访问Windows应用程序app.config文件.特别是,我试图访问"system.net/mailSettings"以下代码

Configuration config = ConfigurationManager.OpenExeConfiguration(configFileName);

MailSettingsSectionGroup settings = 
    (MailSettingsSectionGroup)config.GetSectionGroup(@"system.net/mailSettings");

Console.WriteLine(settings.Smtp.DeliveryMethod.ToString());

Console.WriteLine("host: " + settings.Smtp.Network.Host + "");
Console.WriteLine("port: " + settings.Smtp.Network.Port + "");
Console.WriteLine("Username: " + settings.Smtp.Network.UserName + "");
Console.WriteLine("Password: " + settings.Smtp.Network.Password + "");
Console.WriteLine("from: " + settings.Smtp.From + "");

未能给予主持人.它只获取端口号.其余的都是空的;

这对我来说似乎没问题:

MailSettingsSectionGroup mailSettings =
    config.GetSectionGroup("system.net/mailSettings")
    as MailSettingsSectionGroup;

if (mailSettings != null)
{
    string smtpServer = mailSettings.Smtp.Network.Host;
}

这是我的app.config文件:

但是,如Nathan所述,您可以使用应用程序或计算机配置文件为所有SmtpClient对象指定默认主机,端口和凭据值.有关更多信息,请参阅MDSN上的元素.

不确定这是否有帮助,但如果您正在尝试创建SmtpClient,那么如果您使用默认构造函数,它将自动使用配置文件中的值.

我使用以下方法来访问mailSettings:

var config = ConfigurationManager.OpenExeConfiguration(
    ConfigurationUserLevel.None);

var mailSettings = config.GetSectionGroup("system.net/mailSettings") 
    as MailSettingsSectionGroup;