方法调用方法

Question

我有一些asp.net mvc方法，它们有很多共同的代码行。

所以我试着写一个通用的方法来消除代码重用，但是我没有收到结果。你能告诉我问题出在哪里吗？

//初始代码：

    public ActionResult Details(int? id) {
                if (id == null)
                    return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
                Product product = db.Products.Find(id);
                if (product == null)
                    return HttpNotFound();             
                return View(product);
            }

[HttpGet]
        public ActionResult Edit(int? id) {
            if (id == null)
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            Product product = db.Products.Find(id);
            if (product == null)
                return HttpNotFound();
            return View(product);
        }

[HttpGet]
        public ActionResult Delete (int? id) {
            if (id == null)
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            Product product = db.Products.Find(id);
            if (product == null)
                return HttpNotFound();
            return View(product);
        }

//最终代码：

public void Details(int? id) {
            Common(id);
        }
[HttpGet]
public void Edit(int? id) {
            Common(id);
        }
[HttpGet]
public void Delete (int? id) {
            Common(id);
        }

public ActionResult Common(int? Id) {
            if (Id == null)
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            Product product = db.Products.Find(Id);
            if (product == null)
                return HttpNotFound();
            return View(product);
        }

输出时出现空白屏幕

Answer 1

您无意中或有意地将调用者更改为返回void。调用者的签名不应更改。它们仍应返回ActionResults：

public ActionResult Details(int? id) {
    return Common(id);
}
[HttpGet]
public ActionResult Edit(int? id) {
    return Common(id);
}
[HttpGet]
public ActionResult Delete (int? id) {
    return Common(id);
}