如何防止.NET基类使用? [英] How to prevent .NET base class usage?

问题描述

我正在一个项目中，我需要扩展WebClient来实现自定义实现MyWebClient.

I'm working on a project where I need to extend WebClient for a custom implementation, MyWebClient.

我还需要确保MyWebClient是项目中任何开发人员都实现的唯一版本，并且没有人使用基WebClient类.

I also need to make sure that MyWebClient is the only version that's implemented by any developer on the project and no one uses the base WebClient class.

考虑到不是我可以访问的代码，是否可以防止使用WebClient?

Is it possible to prevent the usage of WebClient, considering it's not code that I have access to?

推荐答案

根据您需要的WebClient功能，您可以考虑将MyWebClient作为代理实现，该代理仅公开允许您使用的MyWebClient方法. c0>成员.

Depending on the features of WebClient you need, you could consider implementing MyWebClient as proxy that exposes only the methods you allow to be used from a WebClient member.

示例:

public class MyWebClient
{
    private WebClient HiddenWebClient {get; set;}

    // proxy sample
    public void DownloadFile(string address, string fileName)
    {
        HiddenWebClient.DownloadFile(address, fileName);
    }

   // other proxy methods & your specific implementation come here.

}

之后，您将需要一个专用的ctor和一个工厂来正确实例化MyWebClient.

After, you will need a dedicated ctor and a maybe a factory to instantiate MyWebClient properly.

这不会阻止您的开发人员使用WebClient，这太困难了(例如，请参阅@gdoron建议)，但将有助于避免错误使用它.

This won't prevent your developers from using WebClient which would be far too difficult (see @gdoron suggestion, for instance), but will help avoiding its usage by mistake.

从您的最后一条评论中，我认为您只需要一个Factory即可为所有WebClient实例设置用户代理.

From your last comment, I think that all you need is a Factory that will set the User Agent for all your WebClient instances.

然后，根据您所在的组织，您需要就其使用情况进行深入的交流(也许还需要一个搜索工具来在项目中查找new WebClient()).

Then, depending on your organization, you will need a strong communication about its usage (and maybe a search tool to look for new WebClient() in your projects).

public static class WebClientFactory
{
    public static WebClient Create()
    {
        WebClient result = new WebClient();
        result.Headers.Add("My Fancy User Agent");
        return result;
    }
}

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