c# - 从 ASP.NET MVC 操作中删除样板

Question

我几乎在每个 Action 中都有这样的东西:

public ActionResult Show(int object_id)
{
    Object obj = ObjectRepository.ById(object_id);
    if (obj == null)
    {
        throw new HttpException(404);
    }
    if (obj.SomeCheck)
    {
        throw new HttpException(403);
    }
    // processing
}

问题是如何将对象获取(和抛出 http 异常)从操作中移开并具有类似这样的东西:

public ActionResult Show(Object obj)
{
    // processing
}

UPD:无法更改 ObjectRepository 和模型本身，它不仅用于 ASP.NET，还用于项目的其他部分。

Answer 1

一种选择是将样板重构为私有(private)方法:

private object GetItem(object obj) {
  Object obj = ObjectRepository.ById(object_id);

  if (obj == null) {
    throw new HttpException(404);
  }

  if (obj.SomeCheck()) {
    throw new HttpException(403);
  }

  return obj;
}

然后:

public ActionResult Show(int object_id) {
  object obj = GetItem(object_id);

  // processing
}