As you can see in the snippet below, sorting is easy with
Linq. Simply provide your OrderBy criteria and you’re done. If you want a secondary sort field, add a ThenBy expression
to the chain. Want a third level sort? Just add ThenBy along with another sort expression.
var projects = new List<Project>
{
new Project {Description = "A", ProjectStatusTypeId = 1},
new Project {Description = "B", ProjectStatusTypeId = 3},
new Project {Description = "C", ProjectStatusTypeId = 3},
new Project {Description = "C", ProjectStatusTypeId = 2},
new Project {Description = "E", ProjectStatusTypeId = 1},
new Project {Description = "A", ProjectStatusTypeId = 2},
new Project {Description = "C", ProjectStatusTypeId = 4},
new Project {Description = "A", ProjectStatusTypeId = 3}
};
projects = projects
.OrderBy(x => x.Description)
.ThenBy(x => x.ProjectStatusTypeId)
.ToList();
foreach (var project in projects)
{
Console.Out.WriteLine("{0} {1}", project.Description,
project.ProjectStatusTypeId);
}
Linq offers a great sort solution most of the time, but what if you want or need
to do it the old fashioned way?
projects.Sort ((x, y) =>
Comparer<String>.Default
.Compare(x.Description, y.Description) != 0 ?
Comparer<String>.Default
.Compare(x.Description, y.Description) :
Comparer<Int32>.Default
.Compare(x.ProjectStatusTypeId, y.ProjectStatusTypeId));
foreach (var project in projects)
{
Console.Out.WriteLine("{0} {1}", project.Description,
project.ProjectStatusTypeId);
}
It’s not that bad, right?
Just for fun, let add some additional logic
to our sort. Let’s say we wanted our secondary sort
to be based on the name associated with the ProjectStatusTypeId.
projects.Sort((x, y) =>
Comparer<String>.Default
.Compare(x.Description, y.Description) != 0 ?
Comparer<String>.Default
.Compare(x.Description, y.Description) :
Comparer<String>.Default
.Compare(GetProjectStatusTypeName(x.ProjectStatusTypeId),
GetProjectStatusTypeName(y.ProjectStatusTypeId)));
foreach (var project in projects)
{
Console.Out.WriteLine("{0} {1}", project.Description,
GetProjectStatusTypeName(project.ProjectStatusTypeId));
}
The comparer will now consider the result of the GetProjectStatusTypeName and order the list accordingly. Of course, you can take this same approach with
Linq as well.
