CODEWITHSUNDEEP
c#linq
Md. Parvez Alam
Md. Parvez Alam

Reputation: 4596

order by nested class property

I have following class structure

public class PriceClass
    {  
        public int id { get; set; }
        public string price { get; set; }
        public int product_id { get; set; }

    }

    public class NameClass
    {
        public int id { get; set; }
        public string name { get; set; }

    }

    public class ProductDetails
    {
        public int id { get; set; }
        public string product_type { get; set; }
         public List<NameClass> nameCl{ get; set; }
        public List<PriceClass> priceCl{ get; set; }
    }

    public class ProductLists
    {
        public List<ProductDetails> ProductDet{ get; set; }
    }

Now I want to sort the ProductLists with price i.e. in priceClass class

I tried with some solution but that does not seems working

prdList = (ProductLists )prdList.ProductDet.OrderBy(r => r.priceCl.OrderBy(x => x.price).ToList());

But it seems i am no where around its solution Please suggest

Thanks

Upvotes: 1

Views: 463

Answers (2)

Parthasarathy
Parthasarathy

Reputation: 2818

You can use a custom IComparer to compare the product details.

public class ProductDetailsComparer : IComparer<ProductDetails>
{
    private bool _compareMinPrice;

    public ProductDetailsComparer(bool compareMinPrice)
    {
        _compareMinPrice = compareMinPrice;
    }

    public int Compare(ProductDetails x, ProductDetails y)
    {
        var left = _compareMinPrice ? x.priceCl.Min(p => p.price) : x.priceCl.Max(p => p.price);
        var right = _compareMinPrice ? y.priceCl.Min(p => p.price) : y.priceCl.Max(p => p.price);

        return left.CompareTo(right);
    }
}

You can use the custom comparer in OrderBy as shown below.

// Sort by minimum price
        var ascending = productLists.ProductDet.OrderBy(x => x, new ProductDetailsComparer(true)).ToList();
        // Sort by maximum price
        var descending = productLists.ProductDet.OrderBy(x => x, new ProductDetailsComparer(false)).ToList();

The above is just a sample. You can write a custom comparer suiting your requirements.

Upvotes: 0

DrKoch
DrKoch

Reputation: 9772

It is just simpler:

sorted_ProductDet_List = prdList.ProductDet
     .OrderBy(prDet => prDet.sortPrice)
     .ToList());

Then you'll have to add a Property sortPrice to priceDetail which returns the relevant price used as sort criterium.

The lambda inside OrderBy works on a single element of the original List (List) and specifies the variable/property/etc (probably from any nested class or method) the sorting is based on.

Upvotes: 2

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