如何在“可能"之间切换对象的类型? [英] How to switch between "possible" type of an object?

问题描述

可能重复:
C# - 有没有更好的替代开启类型"?

我的公司遗留代码如下

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

    // if obj is blah blah blah
}

这种方法很丑.我想重构它，但我不知道迭代 obj 可能是的可能"类型的技术.

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.

我该如何重构它?

谢谢.

推荐答案

你也可以用接口重构这个

You can also refactor this with interfaces

public interface IHasUri
{
   public Uri GetUri();
}

并在所有层次结构中实现此接口.比你可以使用

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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