返回ArrayList中添加的对象

Question

我试图找出如何将一个对象添加到一个arraylist然后返回它。 我的代码如下：

        mediaTitleCollection = new ArrayList();

        public BookMedia CreateBookTitle(string title, string subtitle, string edition, string author, string genre, int weight, int units, string isbn, int pages, int chapters)
        {
            mediaTitleCollection.Add(new BookMedia(title, subtitle, edition, author, genre, weight, units, isbn, pages, chapters));
            // Return the object i have just added in mediaTitleCollection  
        }

我尝试了几种方法并搜索了半个小时，似乎无法找到解决问题的正确方法..

提前致谢。

Answer 1

    mediaTitleCollection = new ArrayList();

    public BookMedia CreateBookTitle(string title, string subtitle, string edition, string author, string genre, int weight, int units, string isbn, int pages, int chapters)
    {  
        BookMedia result=new BookMedia(title, subtitle, edition, author, genre, weight, units, isbn, pages, chapters);
        mediaTitleCollection.Add(result);
        // Return the object i have just added in mediaTitleCollection  
        return result;
    }

Answer 2

return mediaTitleCollection[mediaTitleCollection.Count-1];//After adding, it returns the last object(don't need to initialize a local scope variable)

Answer 3

mediaTitleCollection = new ArrayList();

public BookMedia CreateBookTitle(string title, string subtitle, string edition, string author, string genre, int weight, int units, string isbn, int pages, int chapters)
{
     BookMedia book = new BookMedia(title, subtitle, edition, author, genre, weight, units, isbn, pages, chapters);
    mediaTitleCollection.Add(book );

    return book;
            // Return the object i have just added in mediaTitleCollection  
}

Answer 4

    mediaTitleCollection = new ArrayList();

    public BookMedia CreateBookTitle(string title, string subtitle, string edition, string author, string genre, int weight, int units, string isbn, int pages, int chapters)
    {
        BookMedia bm = new BookMedia(title, subtitle, edition, author, genre, weight, units, isbn, pages, chapters);
        mediaTitleCollection.Add(bm);
        // Return the object i have just added in mediaTitleCollection  
        return bm;
    }