我想重构以下代码以避免if ... else以便每次进入新的调查类型时都不必更改方法(开放/封闭原则).以下是我正在考虑重构的一段代码:
if (surveyType == SurveySubType.Anonymous)
{
DoSomething(param1, param2, param3);
}
else if (surveyType == SurveySubType.Invitational)
{
DoSomething(param1);
}
else if (surveyType == SurveySubType.ReturnLater)
{
DoSomething(param1);
}
为了解决这个问题,我添加了以下类:
public abstract class BaseSurvey
{
public string BuildSurveyTitle()
{
...doing something here
}
public abstract void DoSomething(int? param1,int? param2,int? param3);
}
public class InvitationalSurvey: BaseSurvey
{
public override void DoSomething(int? param1,int? param2,int? param3)
{
//I don't need param2 and param3 here
}
}
public class ReturnLaterSurvey: BaseSurvey
{
public override void …在以下示例中,单击"提交"按钮时,静态变量Count的值将递增.但这个操作线程安全吗？是否正在使用Appliation对象进行此类操作？这些问题也适用于Web表单应用程序.
单击"提交"按钮时,计数似乎总是增加.
查看(剃刀):
@{
Layout = null;
}
<html>
<body>
<form>
<p>@ViewBag.BeforeCount</p>
<input type="submit" value="Submit" />
</form>
</body>
</html>
控制器:
public class HomeController : Controller
{
public ActionResult Index()
{
ViewBag.BeforeCount = StaticVariableTester.Count;
StaticVariableTester.Count += 50;
return View();
}
}
静态类:
public class StaticVariableTester
{
public static int Count;
}