How to set value to child class quickly

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Base Class：

C#

  public class BaseBooks     {

        [DataMember]
        public Guid BookID { get; set; }
        [DataMember]
        public string FourCorners { get; set; }
        //...many attributes
}

Child Class

C#

public class Books:BaseBooks
{
    public void Test()
    {
        List<BaseBooks> listBooks = new Entity.Books(_objUser).GetList();
        Books book;
        foreach (BaseBooks obj in listBooks )
        {
            book = new Books();
            book.BookID = obj.BookID ;
            book.FourCorners = obj.FourCorners ;
            //many many attributes.
            list.Add(book);
        }
    }
}

When BaseBook has many attributes, How to set attribute value to child class quickly in Test,Framework 4.0

Posted 1-Aug-14 0:41am

EnnoMiao

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ZurdoDev 1-Aug-14 8:25am

What do you mean quickly? Each attribute has to be set.

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Nathan Minier · Answer 1 · 2014-08-01T02:50:00

Because it appears that you're using Entity Framework, you shouldn't need to initialize these variables and convert BaseBook to Book. I'm assuming that the "list" variable is of type List<books> in your code sample.

With that in mind, you just need to make use of the "as" instruction.

C#

public class Books:BaseBooks
{
    public void Test()
    {
        List<BaseBooks> listBooks = new Entity.Books(_objUser).GetList();
        foreach (BaseBooks obj in listBooks )
        {
            list.Add(obj as Books);
        }
    }
}

Or we can make this a bit more concise with LINQ:

C#

public void Test()
{
    List<BaseBooks> listBooks = new Entity.Books(_objUser).GetList();
    list.AddRange(listbooks.Select( x => x as Books).ToList());
}

Leo Chapiro · Answer 2 · 2014-08-01T02:53:00

You need to write a so-called copy constructor:

C#

public class Books:BaseBooks
{
  public Books(BaseBooks child)
  {
    BookID = child.BookID;
    // ... and so long 
  }
}
{

So you can later in your code instead of book = new Books(); just say:

C#

//book = new Books();
book = new Books(obj);

How to set value to child class quickly

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