重構方法調用具有不同參數簽名的代理

Question

是否可以使用某種模式來重構此代碼？ 兩種方法之間的唯一區別是，一個方法需要一個額外的參數並將其傳遞給委托？

我發現委托不能接受重載的方法簽名。 我如何再添加一個間接級別？ :)

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，您發布的代碼實際上是應用此模式的一種非常簡潔的方法。 除非有某種方法可以抽象化被調用方法的類型，或者通過消除所有類型安全性，否則您將不會找到更簡單的方法，我不建議這樣做

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);
    }
}

然后像這樣調用方法

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

MyMethod是您要調用的實際方法，因此您將其包含在lambda表達式中，而不是委托中。 認為類似的方法可能有效？