如何区分＆QUOT切换，可能与QUOT;对象的类型？ [英] How to switch between "possible" type of an object?

问题描述

可能重复：
  <一href="http://stackoverflow.com/questions/298976/c-sharp-is-there-a-better-alternative-than-this-to-switch-on-type">C# - 是否有比这更好的选择的类型转换'

我公司传统的code的东西如下

My company legacy code has something as follow

public override Uri GetUri(object obj)
{
    if ((obj is Entry) || (obj is EntryComment))
    {
        //
    }
    if (obj is Blog)
    {
        //
    }

    // if obj is blah blah blah
}

这个方法仅仅是难看。我想重构它，但我不知道的技术遍历可能类型可将obj。

This method is just ugly. I want to refactor it, but I don't know a technique to iterate over "possible" types that obj can be.

我如何重构呢？

感谢你。

推荐答案

您也可以重构这与接口

public interface IHasUri
{
   public Uri GetUri();
}

和所有你层级实现这个接口。比你可以用

and implement this interface in all you hierarchy. Than you can use

public Uri GetUri(object obj)
{
    IHasUri hasUri = obj as IHasUri;
    if(hasUri != null)
      Uri uri = hasUri.GetUri();

    // bla bla bla 
}

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