Question

i have function which return list as given below.

 List<User> lstUsers = SearchUsers(searchText);

which gives a result like below

Username    AddedDate

--------    ---------
sa          02/02/2010
ba          02/02/2011
ta          02/02/2009 

Its gives a reult that is not a problem.I want to create new list filter by date. For example just want a result between the date 01/01/2009 and 02/02/2010.Is there any method in asp to filter a list.
List<User> lstFilterUsers = \\Want Help Here(Filterd new List);
Thanks.

Answer 1

LINQ is great for this:

List<User> filteredUsers = lstUsers.Where(u => u.AddedDate >= dateFrom && u.AddedDate <= dateTo).ToList();

If you can’t use LINQ, use a delegate instead:

List<User> filteredUsers = lstUsers.FindAll(delegate(User u) 
{
    return u.AddedDate >= dateFrom && u.AddedDate <= dateTo;
});

EDIT: If you’re dealing with search strings, and your AddedDate property is of type DateTime you will have to do some string parsing first, e.g.:

private List<User> SearchUsers(string dateFrom, string dateTo)
{
    List<User> filteredUsers = lstUsers.FindAll(delegate(User u) 
    {
        return u.AddedDate >= DateTime.Parse(dateFrom) && u.AddedDate <= DateTime.Parse(dateTo);
    });
}

Then bind the list to your grid:

gdvUsers.DataSource = SearchUsers(dateFrom, dateTo);
gdvUsers.DataBind();