How to switch between quot;possiblequot; type of an object?(如何在“可能之间切换对象的类型?)
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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