实例化要在类库中使用的委托方法

本文关键字：方法 类库 实例化 | 更新日期: 2023-09-27 18:36:12

我正在构建一个电子邮件监控框架，我将用于少数用户，所以我正在构建一个类库来包装所有内容。我正在静态类中实例化配置（发送者、主题、上次接收等）。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，在每种情况下，我们对电子邮件的处理方式将完全不同。我正在尝试的是实例化该委托。我该在哪里做？MyConfig 类，然后从那里调用它作为静态方法？监视类的实例？

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了编译错误。我还尝试使用接口重写方法而不是使用委托......但我认为授权是它所在的地方。

提前感谢！

实例化要在类库中使用的委托方法

与设计的其余部分一致（尽管我不一定同意设计很棒），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);
    }
}

下面是一个用法示例

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);
}

定义构造函数，以便当人们实例化Monitoring对象时，他们必须定义委托：

public class Monitoring 
{
    public delegate void DoSomethingWithEmail(EmailContents theContents);
    public Monitoring(Delegate DoSomethingWithEmail)
    {
        this.DoSomethingWithEmail = DoSomethingWithEmail;
    }
    public void StartMonitoring() {
       //When I get an email, I call the method
       DoSomethingWithEmail(theEmailWeJustGot);
    }
}

然后在实例化每个Monitoring时传入所需的delegate：

Monitoring m = new Monitoring(delegate(EmailContents theContents) 
{ 
    /* Do stuff with theContents here */
});
m.StartMonitoring();
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