How to consolidate results from multiple IEnumerable<T> using LINQ

I could have multiple (upto 5) IEnumerable<ResortSupplier> and would like to consolidate them into single IEnumerable<ResortSupplier> grouping by SupplierCode. My objects looks like this:

Here are my objects:

[Serializable]
public class ResortSupplier
{
    public string SupplierCode { get; set; }
    public IList<Product> ResortProducts { get; set; }
}

[Serializable]
public class Product
{
    public string Code { get; set; }
    //Other fields... 
    public IList<PerPricing> PricingDetail { get; set; }
}

[Serializable]
public class PerPricing
{
    //Other fields..
    public decimal? Price { get; set; }
    public Error PricingError { get; set; }
}

Data in multiple IEnumerable could look like this:

----------------------------------------
IEnumerable<ResortSupplier> - 1

Hyatt Resort
  Standard Room
    PricingDetail-1
  Superior Room    开发者_如何学Python     
    PricingDetail-1

Sandals Resort
  Standard Room
    PricingDetail-1
  Delux Room            
    PricingDetail-1

----------------------------------------
IEnumerable<ResortSupplier> - 2

Hyatt Resort
  Standard Room
    PricingDetail-2
  Superior Room         
    PricingDetail-2
  One Bed Room Suit
    PricingDetail-2

Sandals Resort
  Standard Room
    PricingDetail-2
  Honeymoon Suit            
    PricingDetail-2
----------------------------------------
IEnumerable<ResortSupplier> - 3
.....
----------------------------------------
IEnumerable<ResortSupplier> - 4
.....
----------------------------------------
IEnumerable<ResortSupplier> - 5
.....
----------------------------------------

My consolidated result should contain:

IEnumerable<ResortSupplier> - Consolidated

Hyatt Resort
  Standard Room
    PricingDetail-1
    PricingDetail-2
  Superior Room         
    PricingDetail-1
    PricingDetail-2
  Bed Room Suit
    PricingDetail-2

Sandals Resort
  Standard Room
    PricingDetail-1
    PricingDetail-2
  Delux Room            
    PricingDetail-1
  Honeymoon Suit            
    PricingDetail-2

----------------------------------------

What is the best way to handle this? I tried simple IEnumerable.Union and GroupBy clauses but doesn't get me the results I want.

---

If I'm understanding you, you should use Concat to get them into one big collection, then you can group however you want

IEnumerable<ResortSupplier> master = 
    result1.Concat(result2).Concat(result3); //etc

Then group like you normally would:

var resultGrouped = master.GroupBy(rs => rs.SupplierCode);

---

I think you want something like:

// You can construct this with an array if it isn't already in this form.
IEnumerable<IEnumerable<ResortSupplier>> supplierLists = ...

var query = from suppliers in supplierLists
            from supplier in suppliers
            group supplier by supplier.SupplierCode into g

            let products = g.SelectMany(s => s.ResortProducts)
                            .GroupBy(p => p.Code)
                            .Select(prodGroup => new Product
                                    {
                                       Code = prodGroup.Key,
                                       PricingDetail = prodGroup
                                                       .SelectMany(p => p.PricingDetail)
                                                       .ToList()
                                    })

            select new ResortSupplier
            {
                SupplierCode  = g.Key, 
                ResortProducts = products.ToList()                              
            };

That's a really horrible-looking query though. I strongly recommend factoring out the different components of the query into separate (well-named) methods.