[英]How to avoid branching while using a static factory pattern?
在部署静态工厂模式时,我经常陷入分支,有没有办法使它比下面的代码更整洁:
private static TestEdition GetCurrentEdition(userconfig config)
{
if (config.Edition == Edition.typea)
{
return new TestEdition3(config);
}
else if (config.Edition == Edition.typeb)
{
return new TestEdition4(config);
}
return new UnsupportedEdition(config);
}
我倾向于经常使用这种东西:
private static Dictionary<Edition, Func<userconfig, TestEdition>> _factories =
new Dictionary<Edition, Func<userconfig, TestEdition>>()
{
{ Edition.typea, c => new TestEdition3(c) },
{ Edition.typeb, c => new TestEdition4(c) },
}
private static TestEdition GetCurrentEdition(userconfig config)
{
if (_factories.ContainsKey(config.Edition))
{
return _factories[config.Edition](config);
}
return new UnsupportedEdition(config);
}
巨大的优势是您可以在运行时配置和扩展Dictionary<Edition, Func<userconfig, TestEdition>>
。
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