Question

I need simple linq Query which will create Dictionary
I have Xml which contains list of customers , who can buy some products
For every customer only one product can be given as free
Below is my sample Xml
I have crated a class that look like

Public Class CustomerFreeItem
{
  public string CustomerID
  public string FreeproductName
  public string ActualPrice
}

<customers>
  <customer id="1">
    <product name="book" free="false" actualPrice="10"/>
    <product name="pen" free="true" actualPrice="10"/>
    <product name="scale" free="false" actualPrice="10"/>
  </customer>
  <customer id="2">
    <product name="book" free="true" actualPrice="10"/>
    <product name="pen" free="false" actualPrice="10"/>
    <product name="scale" free="false" actualPrice="10"/>
  </customer>
  <customer id="3">
    <product name="book" free="false" actualPrice="10"/>
    <product name="pen" free="false" actualPrice="10"/>
    <product name="scale" free="true" actualPrice="10"/>
  </customer>
</customers>

Frome Above Xml i want a Dictionary with customer ID as key and value as FreeProduct (CustomerFreeItem object)

Please suggest

Thanks,
Salmon.

Answer 1

Thus it’s not clear what language you are using (class declaration is invalid both in C# and in VB) here is C# soulution

XDocument xdoc = XDocument.Load(path_to_xml_file);
var query = from c in xdoc.Descendants("customer")
            let freeProduct = c.Elements("product")
                                .Where(p => (bool)p.Attribute("free"))
                                .Single()                        
            select new CustomerFreeItem()
            {
                CustomerID = (int)c.Attribute("id"),
                FreeproductName = (string)freeProduct.Attribute("name"),
                ActualPrice = (int)freeProduct.Attribute("actualPrice")
            };

Dictionary<int, CustomerFreeItem> dictionary =  
     query.ToDictionary(x => x.CustomerID);

I used following class declaration:

public class CustomerFreeItem
{
    public int CustomerID { get; set; }
    public string FreeproductName { get; set; }
    public int ActualPrice { get; set; }
}

And I assumed that every customer has exactly one free product.