如何根据对象列表中包含的值创建对象列表C＃

Question

I'm looking for a help. I'm working an exercise based on MVC. My model contains 2 classes. The DVD and the Category

public class DVD
{
public int ID
{ get; set; }

public string Title
{ get; set; }

public decimal Price
{ get; set; }

public int Quantity
{ get; set; }

public int Duration
{ get; set; }

public string Image
{ get; set; }

public virtual IList<Category> Categories_List
{ get; set; }}

Now the Category which is a method contains the following

 public class Category
    {
    public int Id
    { get; set; }

    public string Title
    { get; set; }

    public virtual IList<DVD> DVDs
    { get; set; } }

Both DVD and Category are under the Model folder. What I want to do is to create a list in my controller of the Category (inside the method of public ActionResult Details(int id = 0) ) to collect all the dvds which are in the category with the id 1 for example.

I found something simillar but I have problem when I have to check if the DVD's category id is the same with the one I'm looking for.

Search list of object based on another list of object c#

Can anyone help me to do it? Thank you

Answer 1

Use LINQ Where . This will return call of the movies that match a particular category:

var moviesMatchingCategory = _masterMovieList.Where(ml => ml.Categories_List.Any(cl => cl.Id == categoryIdToCompare)).ToList();

Answer 2

If you can use linq this will help:

public IEnumerable<DVD> FindDvdByCategoryId(int categoryId, IEnumerable<DVD> dvdEnumerable)
    {
        return dvdEnumerable.Where(dvd => dvd.Categories_List.Any(c => c.Id == categoryId)).ToList();
    }

Answer 3

List<DVD> list = dvds.Where(x=>x.Categories_List.Contains(y=>y.Id==Id)).ToList();

试试以上。