重构方法调用具有不同参数签名的代理

Question

是否可以使用某种模式来重构此代码？ 两种方法之间的唯一区别是，一个方法需要一个额外的参数并将其传递给委托？

我发现委托不能接受重载的方法签名。 我如何再添加一个间接级别？ :)

public static void ProcessFolder(
    ProcessFolderDelegate processFolderDelegate
)
{
    using (var esb = ExchangeService.GetExchangeServiceBinding())
    {
        var contactFolder = FolderService.GetPublicFolder(esb,  
            Properties.Settings.Default.ExchangePublicFolderName);
        processFolderDelegate(esb, contactFolder);
    }
}

public static void ProcessContact(  
    ProcessContactDelegate processContactDelegate,  
    Contact contact  //extra param
)
{
    using (var esb = ExchangeService.GetExchangeServiceBinding())
    {
        var contactFolder = FolderService.GetPublicFolder(esb,  
            Properties.Settings.Default.ExchangePublicFolderName);
        processContactDelegate(esb, contactFolder, contact); //extra param
    }
}

Answer 1

    public delegate void Action(TYPE_OF_ESB esb, TYPE_OF_CONTACT_FOLDER contact folder);
    private static void Process(Action action)
    {
        using (var esb = ExchangeService.GetExchangeServiceBinding())
        {
            var contactFolder = FolderService.GetPublicFolder(esb, Properties.Settings.Default.ExchangePublicFolderName);
            action(esb, contactfolder);
        }
    }

Process((esb, contactfolder)=>processFolderDelegate(esb, contactFolder));
Process((esb, contactfolder)=>processContactDelegate(esb, contactFolder, contact));

Answer 2

不，您发布的代码实际上是应用此模式的一种非常简洁的方法。 除非有某种方法可以抽象化被调用方法的类型，或者通过消除所有类型安全性，否则您将不会找到更简单的方法，我不建议这样做

Answer 3

public static void ProcessFolder(ProcessFolderDelegate del)
{
    Process((b, f) => del(b, f));
}

public static void ProcessContact(ProcessContactDelegate del, Contact contact)
{
    Process((b, f) => del(b, f, contact));
}

private static void Process(
    Action<ExchangeServiceBinding, ContactsFolderType> action)
{
    // i've guessed that esb is of type ExchangeServiceBinding
    // and that contactFolder is of type ContactsFolderType
    // if that's not the case then change the type parameters
    // of the Action delegate in the method signature above

    using (var esb = ExchangeService.GetExchangeServiceBinding())
    {
        var contactFolder = FolderService.GetPublicFolder(
            esb, Properties.Settings.Default.ExchangePublicFolderName);
        action(esb, contactFolder);
    }
}

Answer 4

您可以使用匿名方法或lambda：

delegate void ProcessDelegate<T>(T param);
.
.
public static void Process<T>(ProcessDelegate<T> processDelegate)
{
    using (var esb = ExchangeService.GetExchangeServiceBinding())
    {
        var contactFolder = FolderService.GetPublicFolder(esb,  
            Properties.Settings.Default.ExchangePublicFolderName);
        processDelegate(contactFolder);
    }
}

然后像这样调用方法

Process(contactFolder => MyMethod(esb, contactFolder));
Process(contactFolder => MyMethod(esb, contactFolder, contact));

MyMethod是您要调用的实际方法，因此您将其包含在lambda表达式中，而不是委托中。 认为类似的方法可能有效？