CODEWITHSUNDEEP
c#asp.netlistsortingc#-4.0
jedgard
jedgard

Reputation: 868

Sorting List Given a specific scenario

I have a List of objects that I need to sort based on two columns:

List<Customers> customers = CustomerService.GetAll();

Now, the existing code is as follows:

customers.Sort(new CustomerComparer(sortColumn));

where Sort Column could be Date, Name, Amount, Description.

In the comparer class I have:

public class CustomerComparer : IComparer<Customer>
{
    public CustomerComparer(string expression){}

    public int Compare(Customer c, Customer d)
    {
        int value = 0;
        switch(expression)
        {
            case "Name":
            value = String.Compare(c.Name, d.Name,StringComparison.InvariantCultureIgnoreCase);
            break;
            case "Date":
            value = DateTime.Compare(b.Date, d.Date);
            break;
            case "Description":
            value = String.Compare(c.Name, d.Name,StringComparison.InvariantCultureIgnoreCase);
            break;
        }
        return value;
    }
}

Given this scenario, how can I sort based on two Columns? for instance I should always be able to sort on any of those columns, but then BY Date always like:

DESCRIPTION ,DATE
NAME, DATE

etc..

Upvotes: 0

Views: 88

Answers (1)

spender
spender

Reputation: 120440

How about ditching the CustomComparer and using Linq? It then becomes trivial to order by multiple columns. 

var orderedList = 
      customers.OrderBy(c => c.Name).ThenByDescending(c => c.Date).ToList();

Upvotes: 2

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