Question

I am using WPF datagrid. Can I retrieve rows from datagrid using Linq.

Something like :

List<People> people = from products in datagrid1 select products.ToList<People>();

I think no right? It will be great if Linq support datagrid.

Thank you.

Answer 1

I suspect the problem you’re running into is that ItemsSource is weakly typed as just IEnumerable – whereas most of LINQ to Objects works on IEnumerable<T>. You can use the Cast<T>() method to create a sequence which will cast each item where necessary. Try this:

List<People> people = datagrid1.ItemsSource.Cast<People>().ToList();

Note that whenever you see a que ry expression of the form from x in source select x you should consider just using source – query expressions shouldn’t be used blindly; work out what each one means, and then determine whether it’s the most appropriate way of expressing what you need.

If you actually want a bigger query, you may not want to go via a List<People> at all. For example:

// Note the explicit typing of the range variable, which corresponds to a Cast
// call in the query translation.
var query = from People person in datagrid1.ItemsSource
            where person.Age > 50
            select person.Name;

(Consider changing your People type to Person by the way, unless it really does represent a collection of people – in which case you should probably give it a name which reflects what the collection really means.)