代码之家 › 专栏 › 技术社区 › Even Mien

重构调用具有不同参数签名的delgate的方法

delegates refactoring c#

Even Mien · 技术社区 · 15 年前

我发现委托不能接受重载的方法签名。如何再添加一级间接寻址?:)

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
    }
}

4 回复 | 直到 5 年前

Jacob Seleznev 15 年前

    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));

LorenVS 15 年前

不,你发布的代码实际上是应用这种模式的一种非常简洁的方法。除非有某种方法抽象被调用的方法的类型,或者删除所有类型安全性(我不建议这样做),否则您不会找到更简洁的方法

LukeH 15 年前

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);
    }
}

Charlie Gevious 15 年前

您可以使用匿名方法或lambda,如下所示:

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);
    }
}

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

其中MyMethod是您正在调用的实际方法,因此您将其包含在lambda表达式中,而不是委托中。你觉得那样行吗?