c# - 实例化要在类库中使用的委托(delegate)方法

Question

我正在构建一个供少数用户使用的电子邮件监控框架，因此我正在构建一个类库来包装所有内容。我正在实例化配置(发件人、主题、last-收到，...)在静态类中。因此，我有这样的东西。

public static class MyConfig 
{
     public static int Sender { get; set; }
     // and so on and so forth

     public static void BuildMyConfig(string theSender, string theRecipient, ...) 
     {
         Sender = theSender;
         // yada yada yada...
     }
}

public class Monitoring 
{
    public delegate void DoSomethingWithEmail(EmailContents theContents);

    public void StartMonitoring() {

       //When I get an email, I call the method
       DoSomethingWithEmail(theEmailWeJustGot);
    }
}

显然，我们对电子邮件所做的处理在每种情况下都是完全不同的。我想要的是实例化该委托(delegate)。我会在哪里做那件事？ MyConfig 类，然后从那里将其作为静态方法调用？ Monitoring类的实例？

一个应用程序看起来像...

public class SpecificMonitor 
{
    Monitoring.BuildMyConfig("foo@bar.com", "bar@foo.com", ...);

    Monitoring m = new Monitoring();
    m.StartMonitoring();

    //But where do I build the delegate method???

}

到目前为止，我尝试过的每个选项都出现编译错误。我也尝试过重写方法而不是使用委托(delegate)，使用接口(interface)...但我认为委托(delegate)就是它所在的位置。

提前致谢!

Answer 1

与您的其余设计一致(尽管我不一定同意该设计很棒)您可以允许在配置类中设置回调

public static class MyConfig
{
    public static string Sender { get; set; }
    public static DoSomethingWithEmail EmailReceivedCallback { get; set; }

    public static void BuildMyConfig(string theSender, string theRecipient,
            DoSomethingWithEmail callback)
    {
        Sender = theSender;
        EmailReceivedCallback = callback;
    }
}

//  Make sure you bring the delegate outside of the Monitoring class!
public delegate void DoSomethingWithEmail(string theContents);

当您的应用程序确认传入电子邮件时，您现在可以将电子邮件传递给分配给配置类的回调

public class Monitoring
{
    public void StartMonitoring()
    {
        const string receivedEmail = "New Answer on your SO Question!";

        //Invoke the callback assigned to the config class
        MyConfig.EmailReceivedCallback(receivedEmail);
    }
}

这是一个用法示例

static void Main()
{
    MyConfig.BuildMyConfig("...", "...", HandleEmail);

    var monitoring = new Monitoring();
    monitoring.StartMonitoring();
}

static void HandleEmail(string thecontents)
{
    // Sample implementation
    Console.WriteLine("Received Email: {0}",thecontents);
}